View allAll Photos Tagged ECOSYSTEMS
Dusk skies and silhouettes over the magnificent Menindee Lakes in far outback NSW, an oasis in a harsh dry desert landscape. There is a lot of contention over water usage and drainage by nearby cotton farmers draining a large majority of water down the Murray Darling river system.
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Parque Nacional Natural Los Nevados
El páramo es el comienzo de la vida en las montañas de Colombia y un ecosistema fundamental para el ciclo del agua. Sus suelos y su vegetación, con especies únicas como los frailejones, actúan como esponjas naturales que retienen y regulan el agua, convirtiendo a los páramos en la principal fuente de agua dulce para gran parte de la población colombiana.
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Los Nevados National Natural Park
The páramo is the beginning of life in the mountains of Colombia and a fundamental ecosystem for the water cycle. Its soils and vegetation, with unique species such as frailejones, act as natural sponges that retain and regulate water, making the páramos the main source of fresh water for a large part of the Colombian population.
From space it is shockingly visible how fragile our eco- and climate systems are. Mesospheric clouds above Siberia.
Vom All aus ist schockierend deutlich zu sehen, wie zerbrechlich unser Klimasystem ist.
Credits: ESA/NASA
931_1332
Sea Shepherd Conservation Society USA, featuring long-time celebrity supporter and award-winning actor Martin Sheen who has campaigned with the non-profit organization in defense of ocean wildlife. Sheen will speak to media, christen the new ship and announce its name. Sea Shepherd will also announce an upcoming marine conservation campaign in which the new vessel will be used.
The ship, which recently voyaged to California from Hawaii, has already been engaged in work to protect the marine ecosystem and ocean wildlife. Sea Shepherd will discuss these efforts and show a destructive fishing driftnet that was removed from the ocean by the crew.
Sheen is a devoted supporter of Sea Shepherd and long-time friend of Sea Shepherd Founder, Captain Paul Watson. A Golden Globe, Emmy and Screen Actors’ Guild award-winning actor and acclaimed star of television, film and stage, he is also a dedicated activist for environmental, human and animal rights causes. He has joined Sea Shepherd and Captain Watson on campaign, including opposing the brutal seal hunts in Canada. He sits on Sea Shepherd USA’s Media and Arts Advisory Board.
Ambyvalley rd.(Dattawadird.,Kurvande)Lonavala,Mah.,India
Diptera Tipulidae
ID. courtesy:Dmitry Gavryushin
Excerpt from youractionsmatter.ca/e-waste/:
E-Waste
• The production of new electronics consumes large amounts of energy, contributing to climate change, and requires the extraction and depletion of raw materials, leading to the degradation of ecosystems.
• With lifespans lasting only a couple of years for many of these devices, an inordinate amount of waste is produced.
• Canada generates a whopping 954 kilotonnes of e-waste annually, a figure that has almost quadrupled in just 20 years. This amounts to 25 kg for every Canadian, three times the global average.
• What’s worse, this is expected to rise to 1.2 megatonnes by 2030, or over 31 kg per person.
• Electronic products contain hundreds of toxic substances such as lead, mercury, and cadmium.
• Historically, 90% of this waste has ended up in landfills with only 10% being recycled or recovered.
• When dumped in landfills, this toxic waste can leak into the soil and groundwater, harming plants, animals, and even humans.
• Worse still, e-waste in landfills can contribute to air pollution, releasing these chemicals into the atmosphere.
• Greenhouse gas emissions from electronic devices and their associated waste increased by over 50 percent between 2014 and 2020.
• Exposure to these toxins can cause a range of health issues in humans, including neurological disorders, reproductive problems, and various forms of cancer.
• With 80% of Canadians having unwanted electronics at home ready to be recycled, properly recycling them would go a long way to solving the growing issue of e-waste.
• Just as important is the Right to Repair movement, which advocates for consumers to have the ability to repair their own devices. With widespread implementation, it would drastically help alleviate the growing e-waste problem.
Electronic waste has become a significant environmental issue in recent years. In 2021, human beings discarded an estimated 57.4 million tonnes of electronic waste, outweighing the Great Wall of China, the world's heaviest human construction. More concerning is the projection that global e-waste is set to reach 74 million tonnes by 2030, nearly doubling over a 16-year period.
With the rapid pace of technological advancements, consumers replace their cell phones approximately every two years, substantially contributing to the swelling problem of e-waste. The manufacture of electronic devices requires significant amounts of resources. For instance, the production of just one desktop computer needs at least 240 kg of fossil fuels, 22 kg of chemicals, and 1.5 tonnes of water. The substantial consumption of these resources underlines the importance of extending the lifespan of our current gadgets as a crucial step towards reducing our environmental footprint.
This environmental crisis also presents a valuable opportunity. E-waste harbors rich reserves of resources such as gold, silver, copper, and rare earth metals. In 2019 alone, the estimated worth of global e-waste was a staggering $57 billion, an amount surpassing the annual GDP of several countries. With worldwide smartphone sales surpassing a billion units every year, the proper disposal and recycling of these devices can both mitigate the e-waste issue and tap into an enormous repository of precious materials.
In this light it is important to highlight the Right to Repair. This refers to the principle that consumers should have the legal ability to repair and modify their own devices without facing barriers from manufacturers. It aims to counter restrictive practices by manufacturers that limit repairs to authorized service centers, thereby promoting longevity of products and reducing e-waste. Supporting this initiative would drastically reduce our e-waste for years to come.
Mural "The Battle" by Spanish artist Antonio Segura Donat (Dulk) at Rue des Capucins 13 in Mons, Belgium
Antonio Segura, is one of the most important names in Valencian painting at international level. His work began to take shape in urban art and mural painting - to which he remains closely linked today - at the same time as his study work, but he doesn't stop there.
He continues to research and create new forms of expression through various media, including drawing, sculpture and photography. True to its essence - with a strong ecological conviction to defend ecosystems and the most vulnerable species - this work invites the viewer to become part of a unique imagination, full of energy and with a particular sensitivity to colour. A dream world of animals and natural spaces that tells personal, universal and unique stories.
Source: streetartcities.com/cities/mons/markers/37645
... and which, as far as I'm concerned, is well worth a series of 3 pics ;-) This mural, along with the new railway station which had finally opened to the public a few days before, had been one of the reasons that motivated me to visit Mons.
More land was converted to cropland in the 30 years after 1950 than in the 150 years between 1700 and 1850. Cultivated systems (areas where at least 30% of the landscape is in croplands,shifting cultivation, confined livestock production, or freshwater aquaculture) now cover one quarter of Earth’s terrestrial surface.
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This photo has been graciously provided to be used in the GRID-Arendal resources library by: Philippe Rekacewicz, Emmanuelle Bournay, UNEP/GRID-Arendal
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This image shows the northern edge of the San Gabriel Mountains, high above the San Andreas Rift Zone and within sight of the Antelope Valley at the western edge of the Mojave Desert, 3,000 feet below. This is near the small desert community of Valyermo . There are two distinct ecosystems in view the desert with its scrub vegetation, joshua trees and cacti and desert fauna and the pine covered mountains, with lakes and streams.
© Lawrence Goldman 2010, All Rights Reserved
This work may not be copied, reproduced, republished, edited, downloaded, displayed, modified, transmitted, licensed, transferred, sold, distributed or uploaded in any way without my prior written permission.
If you are interested in my works, they are available on Getty Images.
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當言語變得模糊時，我將用照片來聚焦。當影像依然不足以表達時、我也只能沈默以對了。
When words become unclear, I shall focus with photographs. When images become inadequate, I shall be content with silence.
～Ansel Adams
"Welcome to ORBEC 05 ; Ecosystems for rent."
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I couldn't sleep last night so between 4 in the morning and noon , I did this ...
Again, this concept Art has been cropped to fit my horizontal Flickr layout.
I recommend checking out the entire image on www.renderstorm.fr/concept-art/
To make sure you don't miss any, as they won't all be posted here, you can like the Renderstorm page on facebook here:
www.facebook.com/renderstorm.fr/
Hope you guys enjoy these Concept Arts as much as I do making them! There will be much more of em in 2016!
More damage than you think...
Why do we need to protect biodiversity?
Biological diversity, or biodiversity, is the scientific term for the variety of life on Earth. It refers not just to species but also to ecosystems and differences in genes within a single species. Everywhere on the planet, species live together and depend on one another. Every living thing, including man, is involved in these complex networks of interdependent relationships, which are called ecosystems.
Burchell's Zebra and Waterbuck
Steppenzebras und Ellipsen-Wasserbock
iSimangaliso Wetland Park (previously known as the Greater St. Lucia Wetland Park) is situated on the east coast of KwaZulu-Natal, South Africa, about 275 kilometres north of Durban. It is South Africa's third-largest protected area, spanning 280 km of coastline, from the Mozambican border in the north to Mapelane south of the Lake St. Lucia estuary, and made up of around 3,280 km2 of natural ecosystems, managed by the iSimangaliso Authority. The park includes:
Lake St. Lucia
St. Lucia Game Reserve
False Bay Park
Kosi Bay
Lake Etrza Nature Reserve
Lake Sibhayi
St. Lucia Marine Reserve
St. Lucia Marine Sanctuary
Sodwana Bay National Park
Mapelane Nature Reserve
Maputaland Marine Reserve
Cape Vidal
Ozabeni
Mfabeni
Tewate Wilderness Area
Mkuze Game Reserve
The park was previously known as the Greater St. Lucia Wetland Park, but was renamed effective 1 November 2007. The word isimangaliso means "a miracle" or "something wondrous" in Zulu. The name came as a result of Shaka's subject having been sent to the land of the Tsonga. When he came back he described the beauty that he saw as a miracle.
The park is dueto be integrated into a transfrontier park, the Ponta do Ouro-Kosi Bay Transfrontier Conservation Area, straddling South Africa, Mozambique, and Eswatini. This is in turn planned to become a part of the greater Greater Lubombo Transfrontier Conservation Area.
Until 1895, the bay had been a home of the Tsonga people and their Tsonga fish kraal. This is the original and the natural home of the Tsonga people and they have lived here for more than 1000 years. Records from early Portuguese sailors rightfully point out this area to be occupied by the Tsonga people and further down south. The area was also known as Tembeland or Thongaland but the name fell into disuse around the early 1900s. The area was ruled by a Tsonga branch of the Vahlanganu (Tembe). The Swiss Missionary, Reverend Henri Alexandra Junod (Known as HA Junod), conducted a scientific and ethnographic study of the Tsonga people during the early 1890s and produced a detailed map, showing the occupation of the bay by the Tsonga Tembe people. The Swiss Missionary, Rev Junod, illustrated in his detailed map that the area was known as Tembeland and that the Tembe capital city was located in the St Lucia bay. Rev Junod's map showed that by 1906, the Tsonga people occupied the land from St Lucia up until Valdezia in the Spelenkon district of the Transvaal province, known today as Limpopo Province. St Lucia bay and Maputo bay are one land and they belong to the Tsonga people, Tsonga villages were built from St Lucia bay until Maputo and they were not separated by any natural division. Around St Lucia, the ruling chief was the Tembe Royal Family, while around Maputo, the ruling class was the Maputo royal family, who are all of the Vahlanganu branch of the Tsonga people. In and around Maputo and St Lucia bay (Tembeland), the language spoken is Ronga, which according to the Swiss Missionary, Rev HA Junod, is not an independent language but a dialect of Xitsonga. According to Rev Junod, Ronga language is so similar to Xitsonga that it cannot be regarded an independent language but is a dialect of a major language known today as Xitsonga.
The Tsonga people were forcefully removed from the park when Britain colonised the area in 1895 and turned the place into a wildlife reserve and established the holiday town of St Lucia. Because of colonisation, the southern part of the park was handed over to the Zulu nation, while the northern part was given to the Tsonga people. Before colonisation, the Tsonga controlled the entire St Lucia bay. Despite colonisation and annexation of land, the Tsonga people still live in the northern part of the park, at Kosi Bay. The Tembe Elephant Park, run by Chief Israel Tembe, is a living history that testify to the rich Tsonga history of this wetland park. Chief Israel Tembe is the custodian of this ancient Tsonga land that was taken away during colonisation. The Tembe kingdom, one of the most powerful kingdoms in Southern Africa before colonisation, was a ruling class for more than eight centuries.
St. Lucia was first named in 1554 Rio dos Medos do Ouro (alternatively Rio dos Médãos do Ouro — River of the Gold Dunes) by the survivors of the Portuguese ship Saint Benedict. At this stage, only the Tugela River mouth was known as St. Lucia. Later, in 1575, the Tugela River was named Tugela. On 13 December 1575, the day of the feast of Saint Lucy, Manuel Peresterello renamed the mouth area to Santa Lucia.
In 1822, St. Lucia was proclaimed by the British as a township.
In 1895, St. Lucia Game Reserve, 30 km north of the town was proclaimed.
In 1971, St. Lucia Lake and the turtle beaches and coral reefs of Maputaland have been listed by the Convention on Wetlands of International Importance (Ramsar Convention).
In December 1999, the park was declared a UNESCO World Heritage Site at an unveiling ceremony, where Nelson Mandela was the guest of honour.
The park was proclaimed a world heritage site because of the rich biodiversity, unique ecosystems and natural beauty occurring in a relatively small area. The reason for the huge diversity in fauna and flora is the great variety of different ecosystems on the park, ranging from coral reefs and sandy beaches to subtropical dune forests, savannas, and wetlands. Animals occurring on the park include elephant, African leopard, black and southern white rhino, buffalo, and in the ocean, whales, dolphins, and marine turtles including the leatherback and loggerhead turtle.
The park is also home to 1,200 Nile crocodiles and 800 hippopotami.
In December 2013, after 44 years of absence, African lions were reintroduced to iSimangaliso.
There are large outcroppings of underwater reefs which are home to brightly coloured fish and corals. Some of the most spectacular coral diversity in the world is located in Sodwana Bay. The reefs are inhabited by colour-changing octopuses and squid ready to ambush unsuspecting prey. Occasionally gigantic whale sharks can be seen gliding through the water, mouth agape to scoop up tiny plankton.
Twenty-four species of bivalve molluscs are recorded in St. Lucia Lake, which constitutes a considerable portion of the park.
(Wikipedia)
Burchell's Zebra [Equus burchelli]
Appearance
Body stripes are less numerous and broader than that of the Cape Mountain Zebra, whereas body stripes extend around the belly. Leg striping is less prominent. Measures 1.3 to 1.4 metres at the shoulder and weighs 300-320 Kg. They have rounded ears approximately 160-170 mm long. Front portion of mane forms a black tuft between the ears. Diet: Predominantly a grazer, feeding in areas with short grass. Zebra have a strong sensitive upper lip with which it gathers herbage by collecting the grass between the lip and the lower incisors before plucking the harvest.
Breeding
Non seasonal breeder, foals may be born in any month. However, under optimal conditions more foals are born during summer. After a gestation period of 360-390 days, a single foal is born, which weighs 30-35 Kg. Foals are weaned at the age of 11 months.
Behaviour
The Burchell's Zebra lives in small family units, which typically consist of one stallion and one mare with their foals. Non-breeding stallions occur in bachelor groups. Herd stallions are between four to 12 years old. Water holes in conjunction with favoured grazing areas attract family groups which collectively congregate in large numbers. They are often seen in close association with Wildebeest, other plains Antelope and Baboons.
Habitat
Short grassland areas within savanna woodland and grassland plains constitute the preferred habitat. Their dependence on water restricts the Burchell's Zebra to wander further than ten to 12 km from water. Densely vegetated areas are avoided.
Where they are found
Unmistakably a member of the horse family. This species is the largest of the two distinct species inhabiting South Africa's wild life domain. The ranges of the Burchell's Zebra and the Cape Mountain Zebra are mutually exclusive. The Cape mountain Zebra is confined to the Cape mountainous regions, whereas that of the Burchell's Zebra coincides with woodland and grassy plains.
Field Notes
The Burchell's Zebra is the closest relative to the extinct Quagga which roamed the southern plains of South Africa until the 19th century, so close in fact that scientists are using DNA from chosen individual to attempt to bring the Quagga back.
Each individual Zebra has unique markings and act in similar fashion as fingerprints in humans. It is said that newborn Zebra stay close to the mother to imprint her patterns. The southern Burchell's Zebra has a distinctive shadow brown stripe in the white stripe, a characteristic which diminishes the further north they occur.
(krugerpark.co.za)
The waterbuck (Kobus ellipsiprymnus) is a large antelope found widely in sub-Saharan Africa. It is placed in the genus Kobus of the family Bovidae. It was first described by Irish naturalist William Ogilby in 1833. The thirteen subspecies are grouped under two varieties: the common or Ellisprymnus waterbuck and the Defassa waterbuck. The head-and-body length is typically between 177–235 cm (70–93 in) and the average height is between 120 and 136 cm (47 and 54 in). A sexually dimorphic antelope, males are taller as well as heavier than females. Males reach approximately 127 cm (50 in) at the shoulder, while females reach 119 cm (47 in). Males typically weigh 198–262 kg (437–578 lb) and females 161–214 kg (355–472 lb). The coat colour varies from brown to grey. The long, spiral horns, present only on males, curve backward, then forward and are 55–99 cm (22–39 in) long.
Waterbuck are rather sedentary in nature. A gregarious animal, the waterbuck may form herds consisting of six to 30 individuals. These groups are either nursery herds with females and their offspring or bachelor herds. Males start showing territorial behaviour from the age of five years, but are most dominant from the age of six to nine. The waterbuck cannot tolerate dehydration in hot weather, and thus inhabits areas close to sources of water. Predominantly a grazer, the waterbuck is mostly found on grassland. In equatorial regions, breeding takes place throughout the year, but births are at their peak in the rainy season. The gestational period lasts for seven to eight months, followed by the birth of a single calf.
Waterbuck inhabit scrub and savanna areas along rivers, lakes and valleys. Due to their requirement for grasslands as well as water, the waterbuck have a sparse ecotone distribution. The IUCN lists the waterbuck as being of Least Concern. More specifically, the common waterbuck is listed as of Least Concern while the defassa waterbuck is Near Threatened. The population trend for both the common and defassa waterbuck is downwards, especially that of the latter, with large populations being eliminated from certain habitats because of poaching and human disturbance.
The scientific name of the waterbuck is Kobus ellipsiprymnus. The waterbuck is one of the six species of the genus Kobus and belongs to the family Bovidae. It was first described by Irish naturalist William Ogilby in 1833. The generic name Kobus is a New Latin word, originating from an African name, koba. The specific name ellipsiprymnus refers to the white elliptical ring on the rump, from the Greek ellipes (ellipse) and prymnos (prumnos, hind part). The animal acquired the vernacular name "waterbuck" due to its heavy dependence on water as compared to other antelopes and its ability to enter into water for defence.
The type specimen of the waterbuck was collected by South African hunter-explorer Andrew Steedman in 1832. This specimen was named Antilope ellipsiprymnus by Ogilby in 1833. This species was transferred to the genus Kobus in 1840, becoming K. ellipsiprymnus. It is usually known as the common waterbuck. In 1835, German naturalist Eduard Rüppell collected another specimen, which differed from Steedman's specimen in having a prominent white ring on its rump. Considering it a separate species, Rüppell gave it the Amharic name "defassa" waterbuck and scientific name Antilope defassa. Modern taxonomists, however, consider the common waterbuck and the defassa waterbuck a single species, K. ellipsiprymnus, given the large number of instances of hybridisation between the two. Interbreeding between the two takes place in the Nairobi National Park owing to extensive overlapping of habitats.
Not many fossils of the waterbuck have been found. Fossils were scarce in the Cradle of Humankind, occurring only in a few pockets of the Swartkrans. On the basis of Valerius Geist's theories about the relation of social evolution and dispersal in ungulates during the Pleistocene the ancestral home of the waterbuck is considered to be the eastern coast of Africa - with the Horn of Africa to the north and the East African Rift Valley to the west.
The waterbuck is the largest amongst the six species of Kobus. It is a sexually dimorphic antelope, with the males nearly 7 percent taller than females and around 8 percent longer. The head-and-body length is typically between 177–235 cm (70–93 in) and the average height is between 120 and 136 cm (47 and 54 in).[10] Males reach approximately 127 cm (50 in) at the shoulder, while females reach 119 cm (47 in). The waterbuck is one of the heaviest antelopes. a newborn typically weighs 13.6 kg (30 lb), and growth in weight is faster in males than in females. Males typically weigh 198–262 kg (437–578 lb) and females 161–214 kg (355–472 lb). The tail is 22–45 cm (8.7–17.7 in) long.
The waterbuck is of a robust build. The shaggy coat is reddish brown to grey, and becomes progressively darker with age. Males are darker than females. Though apparently thick, the hair is sparse on the coat. The hair on the neck is, however, long and shaggy. When sexually excited, the skin of the waterbuck secretes a greasy substance with the odour of musk, giving it the name "greasy kob". The odor of this is so unpleasant that it repels predators. This secretion also assists in water-proofing the body when the animal dives into water. The facial features include a white muzzle and light eyebrows and lighter insides of the ears. There is a cream-coloured patch (called "bib") on the throat. Waterbuck are characterised by a long neck and short, strong and black legs. Females have two nipples. Preorbital glands, foot glands and inguinal glands are absent.
The common waterbuck and the defassa waterbuck are remarkably different in their physical appearances. Measurements indicate greater tail length in the latter, whereas the common waterbuck stand taller than the defassa waterbuck. However, the principal differentiation between the two types is the white ring of hair surrounding the tail on the rump, which is a hollow circle in the common waterbuck but covered with white hair in the defassa waterbuck.
The long, spiral horns curve backward, then forward. Found only on males, the horns range from 55 to 99 cm (22 to 39 in) in length. To some extent, the length of the horns is related to the bull's age. A rudimentary horn in the form of a bone lump may be found on the skulls of females.
Waterbuck are rather sedentary in nature, though some migration may occur with the onset of monsoon. A gregarious animal, the waterbuck may form herds consisting of six to 30 individuals. The various groups are the nursery herds, bachelor herds and territorial males. Herd size increases in summer, whereas groups fragment in the winter months, probably under the influence of food availability. As soon as young males start developing horns (at around seven to nine months of age), they are chased out of the herd by territorial bulls. These males then form bachelor herds and may roam in female home ranges. Females have home ranges stretching over 200–600 hectares (0.77–2.32 sq mi; 490–1,480 acres). A few females may form spinster herds. Though females are seldom aggressive, minor tension may arise in herds.
Males start showing territorial behaviour from the age of five years, but are most dominant from the age of six to nine. Territorial males hold territories 4–146 hectares (0.015–0.564 sq mi; 9.9–360.8 acres) in size. Males are inclined to remain settled in their territories, though over time they may leave inferior territories for more spacious ones. Marking of territories includes no elaborate rituals - dung and urine are occasionally dropped. After the age of ten years, males lose their territorial nature and replaced by a younger bull, following which they recede to a small and unprotected area. There is another social group, that of the satellite males, which are mature bulls as yet without their own territories, who exploit resources, particularly mating opportunities, even in the presence of the dominant bull. The territorial male may allow a few satellite males into his territory, and they may contribute to its defence. However, gradually they may deprive the actual owner of his territory and seize the area for themselves. In a study in the Lake Nakuru National Park, only 7 percent of the adult males held territories, and only half of the territorial males tolerated one or more satellite males.
Territorial males may use several kinds of display. In one type of display, the white patch on the throat and between the eyes is clearly revealed, and other displays can demonstrate the thickness of the neck. These activities frighten trespassers. Lowering of the head and the body depict submission before the territorial male, who stands erect. Fights, which may last up to thirty minutes, involve threat displays typical of bovids accompanied by snorting. Fights may even become so violent that one of the opponents meets its death due to severe abdominal or thoracic wounds. A silent animal, the waterbuck makes use of flehmen response for visual communication and alarm snorts for vocal communication. Waterbuck often enter water to escape from predators which include lions, leopards, cheetahs, African wild dogs and Nile crocodiles (leopards and spotted hyenas prey on juveniles). However, it has been observed that the waterbuck does not particularly like being in water. Waterbuck may run into cover when alarmed, and males often attack predators.
Waterbuck are susceptible to ulcers, lungworm infection and kidney stones. Other diseases from which these animals suffer are foot-and-mouth disease, sindbis fever, yellow fever, bluetongue, bovine virus diarrhoea, brucellosis and anthrax. The waterbuck is more resistant to rinderpest than are other antelopes. They are unaffected by tsetse flies but ticks may introduce parasitic protozoa such as Theileria parva, Anaplasma marginale and Baberia bigemina. 27 species of ixodid tick have been found on waterbuck - a healthy waterbuck may carry a total of over 4000 ticks in their larval or nymphal stages, the most common among them being Amblyomma cohaerens and Rhipicephalus tricuspis. Internal parasites found in waterbuck include tapeworms, liverflukes, stomachflukes and several helminths.
The waterbuck exhibits great dependence on water. It can not tolerate dehydration in hot weather, and thus inhabits areas close to sources of water. However, it has been observed that unlike the other members of its genus (such as the kob and puku), the waterbuck ranges farther into the woodlands while maintaining its proximity to water. With grasses constituting a substantial 70 to 95 percent of the diet, the waterbuck is predominantly a grazer frequenting grasslands. Reeds and rushes like Typha and Phragmites may also be preferred.A study found regular consumption of three grass species round the year: Panicum anabaptistum, Echinochloa stagnina and Andropogon gayanus. Hyparrhenia involucrata, Acroceras amplectens and Oryza barthii along with annual species were the main preference in the early rainy season, while long life grasses and forage from trees constituted three-fourths of the diet in the dry season.
Though the defassa waterbuck were found to have a much greater requirement for protein than the African buffalo and the Beisa oryx, the waterbuck was found to spend much less time on browsing (eating leaves, small shoots and fruits) in comparison to the other grazers. In the dry season about 32 percent of the 24-hour day was spent in browsing, whereas no time was spent on it during the wet season. The choice of grasses varies with location rather than availability; for instance, in western Uganda, while Sporobolus pyramidalis was favoured in some places, Themeda triandra was the main choice elsewhere. The common waterbuck and the defassa waterbuck in the same area may differ in their choices; it has been observed that while the former preferred Heteropogon contortus and Cynodon dactylon, the latter showed less preference for these grasses.
Waterbuck are slower than other antelopes in terms of the rate of maturity. While males become sexually mature at the age of six years, females reach maturity within two to three years. Females may conceive by the age of two-and-a-half years, and remain reproductive for another ten years. In equatorial regions, breeding takes place throughout the year, and births are at their peak in the rainy season. However, breeding is seasonal in the Sudan (south of Sahara), with the mating season lasting four months. The season extends for even longer periods in some areas of southern Africa. Oestrus lasts for a day or less.
Mating begins after the male confirms that the female is in oestrus, which he does by sniffing her vulva and urine. A resistive female would try to bite or even fight off an advancing male. The male exhibits flehmen, and often licks the neck of the female and rubs his face and the base of his horns against her back. There are several attempts at mounting before the actual copulation. The female shifts her tail to one side, while the male clasps her sides with his forelegs and rests on her back during copulation, which may occur as many as ten times.
The gestational period lasts for seven to eight months, followed by the birth of a single calf. Twins are rare. Pregnant females isolate themselves in thickets as parturition approaches. Newborn calves can stand on their feet within a half-hour of birth. The mother eats the afterbirth. She communicates with the calf by bleating or snorting. Calves are kept hidden from two to three weeks up to two months. At about three to four weeks, the calf begins following its mother, who signals it to do so by raising her tail. Though bereft of horns, mothers will fiercely defend their offspring from predators. Calves are weaned at eight months, following which time they join groups of calves of their own age. Young females remain with their mothers in nursery herds, or may also join bachelor herds. The waterbuck lives to 18 years in the wild and 30 years in captivity.
The waterbuck is native to southern and eastern Africa (including countries such as Angola, Botswana, The Democratic Republic of Congo, Ethiopia, Kenya, Namibia, South Africa, Tanzania and Uganda) besides a few countries of western and northern Africa such as Chad, Côte d'Ivoire, Ghana, Mali, Niger, Nigeria and Senegal. Though formerly widespread in sub-Saharan Africa, its numbers have now decreased in most areas.
The common waterbuck is found east of the Eastern African Rift. Its southern range extends to the Hluhluwe-Umfolozi Game Reserve (KwaZulu Natal) and to central Namibia. By contrast, the defassa waterbuck inhabits western and central Africa. The defassa waterbuck occurs west of the Albertine Rift and ranges from Eritrea to Guinea Bissau in the southern Sahel, its most northerly point of distribution being in southern Mali. Its range also stretches east of the Congo basin through Zambia into Angola, while another branch extends to the Zaire River west of the Congo basin. While the common waterbuck is now extinct in Ethiopia, the defassa waterbuck has become extinct in Gambia.
Waterbuck inhabit scrub and savanna areas alongside rivers, lakes and valleys. Due to their requirement for grasslands as well as water, the waterbuck have a sparse distribution across ecotones (areas of interface between two different ecosystems). A study in the Ruwenzori Range showed that the mean density of waterbuck was 5.5 per square mile, and estimates in the Maasai Mara were as low as 1.3 per square mile. It has been observed that territorial size depends on the quality of the habitat, the age and health of the animal and the population density. The greater the age of the animal or the denser the populations, the smaller are the territories. In Queen Elizabeth National Park, females had home ranges 21–61 hectares (0.081–0.236 sq mi; 52–151 acres) in area whereas home ranges for bachelor males averaged between 24–38 hectares (0.093–0.147 sq mi; 59–94 acres). The oldest female (around 18 years old) had the smallest home range.
The International Union for the Conservation of Nature and Natural Resources (IUCN) lists the waterbuck as of least concern (LC). More specifically, the common waterbuck is listed as of Least Concern while the defassa waterbuck is near threatened (NT). The population trend for both the common and defassa waterbuck is decreasing, especially that of the latter, with large populations being eliminated from their habitats due to poaching and human settlement. Their own sedentary nature too is responsible for this to some extent. Numbers have fallen in Queen Elizabeth National Park, Murchison Falls National Park, Akagera National Park, Lake Nakuru National Park, and Comoé National Park. Population decrease in the Lake Nakuru National Park has been attributed to heavy metal poisoning. While cadmium and lead levels were dangerously high in the kidney and the liver, deficiencies of copper, calcium and phosphorus were noted.
Over 60 percent of the defassa waterbuck populations thrive in protected areas, most notably in Niokolo-Koba, Comoe, Mole, Bui, Pendjari, Manovo-Gounda St. Floris, Moukalaba-Doudou, Garamba, Virunga, Omo, Mago, Murchison Falls, Serengeti, and Katavi, Kafue and Queen Elizabeth National Parks, the national parks and hunting zones of North Province (Cameroon), Ugalla River Forest Reserve, Nazinga Game Ranch, Rukwa Valley, Awash Valley, Murule and Arly-Singou. The common waterbuck occurs in Tsavo, Tarangire, Mikumi, Kruger and Lake Nakuru National Parks, Laikipia, Kajiado, Luangwa Valley, Selous and Hluhluwe-Umfolozi game reserves and private lands in South Africa.
(Wikipedia)
Der iSimangaliso Wetland Park (bis Oktober 2007 Greater St. Lucia Wetland Park, danach iSimangaliso Wetland Park) ist ein Nationalpark an der Ostküste der südafrikanischen Provinz KwaZulu-Natal. Der Eingang zum Park befindet sich nahe der Kleinstadt St. Lucia.
Der Nationalpark umfasst die Feucht- und Küstengebiete von Mapelane im Süden bis hinauf zur Sodwana-Bucht im Norden und besteht aus vielen kleinen Schutzgebieten mit subtropischer bis tropischer Vegetation. Im Norden liegen die Mkuze-Sümpfe, während sich im Westen trockene Dornensavannen befinden.
Im Zentrum des Parks befindet sich der St.-Lucia-See, nach dem der Park benannt wurde. Mit einer Länge von 40 Kilometern und einer Breite von bis zu 21 Kilometern beträgt seine Fläche rund 300 km²; damit ist er der größte See Südafrikas. In dem 200 Kilometer langen Küstenstreifen finden sich die zweithöchsten bewaldeten Sanddünen der Welt.
In den Feuchtgebieten leben die größten Krokodil- und Flusspferdbestände Südafrikas. In den Savannen im Westen leben Meerkatzen, Nashörner, Büffel und Leoparden. Zwischen den Seen und Sümpfen brüten Reiher, Pelikane und Störche. Der Park verfügt über die höchste Dichte an Amphibien, darunter viele geschützte Arten. Außerdem kann man auf der Meeresseite Buckelwale sehen.
In der Nähe des Nationalparks befindet sich der Ort St. Lucia, in dem es Übernachtungs-, Freizeit- und Einkaufsmöglichkeiten gibt. St. Lucia ist zudem Ausgangspunkt für Walbeobachtungen und Fahrten auf dem St.-Lucia-See zu den Flusspferden.
Der iSimangaliso Wetland Park wurde 1999 in die Liste des Weltnaturerbes der UNESCO aufgenommen.
2004 wurde die Mündung des Feuchtgebietes durch eine Sanddüne gesperrt, um eine Ölpest nach der Havarie des Frachters Jolly Rubino abzuwehren. Seitdem ist der Wasserspiegel erheblich unter Meeresniveau gesunken, so dass die Maßnahme noch nicht rückgängig gemacht werden konnte.
Bis 2007 hieß der Nationalpark Greater St. Lucia Wetland Park. Seit November 2007 wird er iSimangaliso Wetland Park genannt. isimangaliso bedeutet „Wunder“ und verweist auf ein Zulu-Sprichwort über Ujeqe, einem Hofbeamten des Zulu-König Shaka: Ubone isimanga esabonwa uJeqe kwelama Thonga. – „Wenn Du Wunder gesehen hast, dann hast Du dasselbe gesehen wie Ujeqe in Thonga.“ Thonga oder Tongaland ist ein historischer Name für die Region Maputaland, zu der der Park gehört.
(Wikipedia)
Das Steppenzebra (Equus quagga) oder Pferdezebra ist ein Zebra aus der Familie der Pferde (Equidae) und gehört zur Ordnung der Unpaarhufer (Perissodactyla). Es stellt heute die häufigste Zebra-Art in Afrika dar und ist vom Nordosten bis in den Süden des Kontinents verbreitet. Es lebt gesellig in kleinen Herdenverbänden und ernährt sich hauptsächlich von Gräsern. Im Gegensatz zu den anderen heutigen Pferdearten kommt es auch in teilweise geschlossenen Landschaften vor. Der Bestand, dessen größte Population heute in der Serengeti lebt, gilt als nicht gefährdet. Es werden sechs rezente Unterarten unterschieden, die sich meistens deutlich in der Streifenzeichnung voneinander abheben.
(Wikipedia)
Als Wasserbock werden zwei Arten afrikanischer Antilopen aus der Gattung der Wasserböcke (Kobus) bezeichnet. Man unterscheidet den Ellipsen-Wasserbock (Kobus ellipsiprymnus) und den Defassa-Wasserbock (Kobus defassa). Beide wurden ursprünglich in einer Art zusammengefasst und zur Unterscheidung von den anderen Arten der Gattung Kobus auch unter dem Namen Gemeiner Wasserbock geführt, heute gelten sie als eigenständig.
Der Ellipsen-Wasserbock (Kobus ellipsiprymnus) ist eine große, kräftige, bis zu 270 kg schwere Antilope mit zotteligem, graubraunem Fell und einem weißen Ring um den Schwanzansatz (die namengebende Ellipse). Auch das Gesicht ist teilweise weiß, und ein weißer Streifen zieht sich von der Kehle bis zum Ohrenansatz. Nur die männlichen Tiere tragen lange, stark geringelte, weit geschwungene und nach vorne gerichtete Hörner. Die Schulterhöhe beträgt 1,30 m.
Das Verbreitungsgebiet reicht von Südafrika und Nordost-Namibia über Botswana und Mosambik und die Savannen Ostafrikas bis nach Äthiopien und Somalia.
Diese Antilopenart ist an Dauergewässer gebunden, in deren Nähe sich Wälder oder offenes Grasgelände mit Dickicht und Schilf bewachsene Gebiete befinden. Junge Männchen bilden eigene Herden, Weibchen und Jungtiere leben in Gruppen von 5 bis 10 Tieren zusammen.
Die beiden Wasserbock-Arten sind weniger stark ans Wasser gebunden als andere Vertreter ihrer Gattung. Sie können sich durchaus vom Wasser entfernen und sind dann in der offenen Savanne oder in Wäldern zu finden. Die weiblichen Wasserböcke leben in Herden von etwa fünf, in seltenen Fällen bis zu siebzig Tieren. Ebenfalls Herden bilden junge Männchen. Dagegen werden ältere Männchen zu Einzelgängern, die ein Revier gegen Artgenossen verteidigen und jedes durchziehende Weibchen für sich beanspruchen.
Wasserböcke gehören zu den häufigsten Großsäugetieren Afrikas. Schätzungsweise gibt es etwa 95.000 Defassa-Wasserböcke und 105.000 Ellipsen-Wasserböcke, von denen mehr als die Hälfte in Schutzgebieten lebt. Beide Arten werden seitens der IUCN als gering gefährdet (near threatened) klassifiziert. Die Bestände außerhalb von Schutzgebieten sind durch Jagd und Habitatzerstörung rückläufig.
(Wikipedia)
The complex ecosystem of the rainforest is filled with such a plethora of tiny hungry creatures that many predators may themselves become victims to something larger. Here, in the humid jungles of southern New Guinea, an unfortunate tree frog is being devoured by a large huntsman spider (family Sparassidae). With leg spans sometimes exceeding 15cm, these spiders spin no webs and instead rely on speed to catch their prey. South Papua, Indonesia (New Guinea).
Established in 1934, to protect a fragile ecosystem of the vanishing Everglades.
U.S. National Park in Florida, that protect a 20% of the original southern Everglades. In the United States, it is the largest tropical wilderness, the largest wilderness of any kind east of the Mississippi River, and is visited on average by one million people each year. It is the third-largest national park in the lower 48 states after Death Valley and Yellowstone. It has been declared an International Biosphere Reserve, a World Heritage Site, and a Wetland of International Importance, one of only three locations in the world to appear on all three lists. is home to 36 threatened or protected species including the Florida panther, the American crocodile, and the West Indian manatee, and supports 350 species of birds, 300 species of fresh and saltwater fish, 40 species of mammals, and 50 species of reptiles.
The Ohia tree is a mainstay of the native ecosystem, birds love its flowers and berries. Pele likes it too, the flowers are her favorite color.
Volcanoes National Park, Hawaii. Jan. 2025.
Doñana's National park (Spain), Dunes ecosystem,
Doñana's National Park includes five different ecosystems: Beaches, Dunes, Border, Marsh and Forest. The system of mobile dunes of Doñana, unique in Spain, is one of the most beautiful landscapes of the park. The dunes, extremely interesting both from an ecological and a cultural viewpoint, are formed by accumulations of sand whose front of progress has a steeper slope than the part of displacement called tail. The progress of the dunes from the beach buries and destroys the vegetation that finds on its way, forming between two dunes the “corrales”, copses of stone pines and bushes. (www.donanavisitas.es/en)
[ESP] El Parque Nacional de Doñana incluye cinco ecosistemas distintos: Playas, Dunas, Vera, Marisma y Bosque. El sistema de Dunas móviles de Doñana, único en España, es uno de los paisajes más bellos del parque. Sumamente interesante, tanto ecológica como culturalmente, las dunas se forman por acumulaciones de arena cuyo frente de avance tiene una pendiente más acusada que la parte de desplazamiento denominada cola. El avance de las dunas desde la playa entierra y destruye la vegetación que encuentra a su paso, formándose entre dos dunas los "corrales", bosquetes de pino piñonero y matorral. (www.donanavisitas.es)
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Yellowstone National Park (Arapaho: Henihco'oo or Héetíhco'oo) is a national park located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone, widely held to be the first national park in the world, is known for its wildlife and its many geothermal features, especially Old Faithful Geyser, one of the most popular features in the park. It has many types of ecosystems, but the subalpine forest is most abundant. It is part of the South Central Rockies forests ecoregion.
Yellowstone National Park spans an area of 3,468.4 square miles (8,983 km2), comprising lakes, canyons, rivers and mountain ranges. Yellowstone Lake is one of the largest high-altitude lakes in North America and is centered over the Yellowstone Caldera, the largest supervolcano on the continent. The caldera is considered an active volcano. It has erupted with tremendous force several times in the last two million years. Half of the world's geothermal features are in Yellowstone, fueled by this ongoing volcanism. Lava flows and rocks from volcanic eruptions cover most of the land area of Yellowstone. The park is the centerpiece of the Greater Yellowstone Ecosystem, the largest remaining nearly-intact ecosystem in the Earth's northern temperate zone.
Hundreds of species of mammals, birds, fish and reptiles have been documented, including several that are either endangered or threatened. The vast forests and grasslands also include unique species of plants. Yellowstone Park is the largest and most famous megafauna location in the Continental United States. Grizzly bears, wolves, and free-ranging herds of bison and elk live in the park. The Yellowstone Park bison herd is the oldest and largest public bison herd in the United States. Forest fires occur in the park each year; in the large forest fires of 1988, nearly one third of the park was burnt. Yellowstone has numerous recreational opportunities, including hiking, camping, boating, fishing and sightseeing. Paved roads provide close access to the major geothermal areas as well as some of the lakes and waterfalls. During the winter, visitors often access the park by way of guided tours that use either snow coaches or snowmobiles.
The park is located at the headwaters of the Yellowstone River, from which it takes its historical name. Near the end of the 18th century, French trappers named the river "Roche Jaune", which is probably a translation of the Hidatsa name "Mi tsi a-da-zi" (Rock Yellow River). Later, American trappers rendered the French name in English as "Yellow Stone". Although it is commonly believed that the river was named for the yellow rocks seen in the Grand Canyon of the Yellowstone, the Native American name source is not clear.
The first detailed expedition to the Yellowstone area was the Cook–Folsom–Peterson Expedition of 1869, which consisted of three privately funded explorers. The Folsom party followed the Yellowstone River to Yellowstone Lake. The members of the Folsom party kept a journal and based on the information it reported, a party of Montana residents organized the Washburn-Langford-Doane Expedition in 1870. It was headed by the surveyor-general of Montana Henry Washburn, and included Nathaniel P. Langford (who later became known as "National Park" Langford) and a U.S. Army detachment commanded by Lt. Gustavus Doane.
The expedition spent about a month exploring the region, collecting specimens and naming sites of interest. A Montana writer and lawyer named Cornelius Hedges, who had been a member of the Washburn expedition, proposed that the region should be set aside and protected as a national park; he wrote a number of detailed articles about his observations for the Helena Herald newspaper between 1870 and 1871. Hedges essentially restated comments made in October 1865 by acting Montana Territorial Governor Thomas Francis Meagher, who had previously commented that the region should be protected. Others made similar suggestions. In an 1871 letter from Jay Cooke to Ferdinand V. Hayden, Cooke wrote that his friend, Congressman William D. Kelley had also suggested "Congress pass a bill reserving the Great Geyser Basin as a public park forever".
By 1915, 1,000 automobiles per year were entering the park, resulting in conflicts with horses and horse-drawn transportation. Horse travel on roads was eventually prohibited.
The Civilian Conservation Corps (CCC), a New Deal relief agency for young men, played a major role between 1933 and 1942 in developing Yellowstone facilities. CCC projects included reforestation, campground development of many of the park's trails and campgrounds, trail construction, fire hazard reduction, and fire-fighting work. The CCC built the majority of the early visitor centers, campgrounds and the current system of park roads.
During World War II, tourist travel fell sharply, staffing was cut, and many facilities fell into disrepair. By the 1950s, visitation increased tremendously in Yellowstone and other national parks. To accommodate the increased visitation, park officials implemented Mission 66, an effort to modernize and expand park service facilities. Planned to be completed by 1966, in honor of the 50th anniversary of the founding of the National Park Service, Mission 66 construction diverged from the traditional log cabin style with design features of a modern style. During the late 1980s, most construction styles in Yellowstone reverted to the more traditional designs. After the enormous forest fires of 1988 damaged much of Grant Village, structures there were rebuilt in the traditional style. The visitor center at Canyon Village, which opened in 2006, incorporates a more traditional design as well.
A large arch made of irregular-shaped natural stone over a road
The 1959 Hebgen Lake earthquake just west of Yellowstone at Hebgen Lake damaged roads and some structures in the park. In the northwest section of the park, new geysers were found, and many existing hot springs became turbid. It was the most powerful earthquake to hit the region in recorded history.
In 1963, after several years of public controversy regarding the forced reduction of the elk population in Yellowstone, United States Secretary of the Interior Stewart Udall appointed an advisory board to collect scientific data to inform future wildlife management of the national parks. In a paper known as the Leopold Report, the committee observed that culling programs at other national parks had been ineffective, and recommended management of Yellowstone's elk population.
The wildfires during the summer of 1988 were the largest in the history of the park. Approximately 793,880 acres (321,272 ha; 1,240 sq mi) or 36% of the parkland was impacted by the fires, leading to a systematic re-evaluation of fire management policies. The fire season of 1988 was considered normal until a combination of drought and heat by mid-July contributed to an extreme fire danger. On "Black Saturday", August 20, 1988, strong winds expanded the fires rapidly, and more than 150,000 acres (61,000 ha; 230 sq mi) burned.
The expansive cultural history of the park has been documented by the 1,000 archeological sites that have been discovered. The park has 1,106 historic structures and features, and of these Obsidian Cliff and five buildings have been designated National Historic Landmarks. Yellowstone was designated an International Biosphere Reserve on October 26, 1976, and a UN World Heritage Site on September 8, 1978. The park was placed on the List of World Heritage in Danger from 1995 to 2003 due to the effects of tourism, infection of wildlife, and issues with invasive species. In 2010, Yellowstone National Park was honored with its own quarter under the America the Beautiful Quarters Program.
Heritage and Research Center
The Heritage and Research Center is located at Gardiner, Montana, near the north entrance to the park. The center is home to the Yellowstone National Park's museum collection, archives, research library, historian, archeology lab, and herbarium. The Yellowstone National Park Archives maintain collections of historical records of Yellowstone and the National Park Service. The collection includes the administrative records of Yellowstone, as well as resource management records, records from major projects, and donated manuscripts and personal papers. The archives are affiliated with the National Archives and Records Administration.
Approximately 96 percent of the land area of Yellowstone National Park is located within the state of Wyoming. Another three percent is within Montana, with the remaining one percent in Idaho. The park is 63 miles (101 km) north to south, and 54 miles (87 km) west to east by air. Yellowstone is 2,219,789 acres (898,317 ha; 3,468.420 sq mi) in area, larger than the states of Rhode Island or Delaware. Rivers and lakes cover five percent of the land area, with the largest water body being Yellowstone Lake at 87,040 acres (35,220 ha; 136.00 sq mi). Yellowstone Lake is up to 400 feet (120 m) deep and has 110 miles (180 km) of shoreline. At an elevation of 7,733 feet (2,357 m) above sea level, Yellowstone Lake is the largest high altitude lake in North America. Forests comprise 80 percent of the land area of the park; most of the rest is grassland.
The Continental Divide of North America runs diagonally through the southwestern part of the park. The divide is a topographic feature that separates Pacific Ocean and Atlantic Ocean water drainages. About one third of the park lies on the west side of the divide. The origins of the Yellowstone and Snake Rivers are near each other but on opposite sides of the divide. As a result, the waters of the Snake River flow to the Pacific Ocean, while those of the Yellowstone find their way to the Atlantic Ocean via the Gulf of Mexico.
The park sits on the Yellowstone Plateau, at an average elevation of 8,000 feet (2,400 m) above sea level. The plateau is bounded on nearly all sides by mountain ranges of the Middle Rocky Mountains, which range from 9,000 to 11,000 feet (2,700 to 3,400 m) in elevation. The highest point in the park is atop Eagle Peak (11,358 feet or 3,462 metres) and the lowest is along Reese Creek (5,282 feet or 1,610 metres). Nearby mountain ranges include the Gallatin Range to the northwest, the Beartooth Mountains in the north, the Absaroka Range to the east, and the Teton Range and the Madison Range to the southwest and west. The most prominent summit on the Yellowstone Plateau is Mount Washburn at 10,243 feet (3,122 m).
Yellowstone National Park has one of the world's largest petrified forests, trees which were long ago buried by ash and soil and transformed from wood to mineral materials. This ash and other volcanic debris, are believed to have come from the park area itself. This is largely due to the fact that Yellowstone is actually a massive caldera of a supervolcano. There are 290 waterfalls of at least 15 feet (4.6 m) in the park, the highest being the Lower Falls of the Yellowstone River at 308 feet (94 m).
Three deep canyons are located in the park, cut through the volcanic tuff of the Yellowstone Plateau by rivers over the last 640,000 years. The Lewis River flows through Lewis Canyon in the south, and the Yellowstone River has carved two colorful canyons, the Grand Canyon of the Yellowstone and the Black Canyon of the Yellowstone in its journey north.
Yellowstone is at the northeastern end of the Snake River Plain, a great U-shaped arc through the mountains that extends from Boise, Idaho some 400 miles (640 km) to the west. This feature traces the route of the North American Plate over the last 17 million years as it was transported by plate tectonics across a stationary mantle hotspot. The landscape of present-day Yellowstone National Park is the most recent manifestation of this hotspot below the crust of the Earth.
The Yellowstone Caldera is the largest volcanic system in North America. It has been termed a "supervolcano" because the caldera was formed by exceptionally large explosive eruptions. The magma chamber that lies under Yellowstone is estimated to be a single connected chamber, about 37 miles (60 km) long, 18 miles (29 km) wide, and 3 to 7 miles (5 to 12 km) deep. The current caldera was created by a cataclysmic eruption that occurred 640,000 years ago, which released more than 240 cubic miles (1,000 km³) of ash, rock and pyroclastic materials. This eruption was more than 1,000 times larger than the 1980 eruption of Mount St. Helens. It produced a caldera nearly five eighths of a mile (1 km) deep and 45 by 28 miles (72 by 45 km) in area and deposited the Lava Creek Tuff, a welded tuff geologic formation. The most violent known eruption, which occurred 2.1 million years ago, ejected 588 cubic miles (2,450 km³) of volcanic material and created the rock formation known as the Huckleberry Ridge Tuff and created the Island Park Caldera. A smaller eruption ejected 67 cubic miles (280 km³) of material 1.3 million years ago, forming the Henry's Fork Caldera and depositing the Mesa Falls Tuff.
Each of the three climactic eruptions released vast amounts of ash that blanketed much of central North America, falling many hundreds of miles away. The amount of ash and gases released into the atmosphere probably caused significant impacts to world weather patterns and led to the extinction of some species, primarily in North America.
Wooden walkways allow visitors to closely approach the Grand Prismatic Spring.
A subsequent caldera-forming eruption occurred about 160,000 years ago. It formed the relatively small caldera that contains the West Thumb of Yellowstone Lake. Since the last supereruption, a series of smaller eruptive cycles between 640,000 and 70,000 years ago, has nearly filled in the Yellowstone Caldera with >80 different eruptions of rhyolitic lavas such as those that can be seen at Obsidian Cliffs and basaltic lavas which can be viewed at Sheepeater Cliff. Lava strata are most easily seen at the Grand Canyon of the Yellowstone, where the Yellowstone River continues to carve into the ancient lava flows. The canyon is a classic V-shaped valley, indicative of river-type erosion rather than erosion caused by glaciation.
Each eruption is part of an eruptive cycle that climaxes with the partial collapse of the roof of the volcano's partially emptied magma chamber. This creates a collapsed depression, called a caldera, and releases vast amounts of volcanic material, usually through fissures that ring the caldera. The time between the last three cataclysmic eruptions in the Yellowstone area has ranged from 600,000 to 800,000 years, but the small number of such climactic eruptions cannot be used to make an accurate prediction for future volcanic events.
The most famous geyser in the park, and perhaps the world, is Old Faithful Geyser, located in Upper Geyser Basin. Castle Geyser, Lion Geyser and Beehive Geyser are in the same basin. The park contains the largest active geyser in the world—Steamboat Geyser in the Norris Geyser Basin. A study that was completed in 2011 found that at least 1283 geysers have erupted in Yellowstone. Of these, an average of 465 are active in a given year. Yellowstone contains at least 10,000 geothermal features altogether. Half the geothermal features and two-thirds of the world's geysers are concentrated in Yellowstone.
In May 2001, the U.S. Geological Survey, Yellowstone National Park, and the University of Utah created the Yellowstone Volcano Observatory (YVO), a partnership for long-term monitoring of the geological processes of the Yellowstone Plateau volcanic field, for disseminating information concerning the potential hazards of this geologically active region.
In 2003, changes at the Norris Geyser Basin resulted in the temporary closure of some trails in the basin. New fumaroles were observed, and several geysers showed enhanced activity and increasing water temperatures. Several geysers became so hot that they were transformed into purely steaming features; the water had become superheated and they could no longer erupt normally. This coincided with the release of reports of a multiple year United States Geological Survey research project which mapped the bottom of Yellowstone Lake and identified a structural dome that had uplifted at some time in the past. Research indicated that these uplifts posed no immediate threat of a volcanic eruption, since they may have developed long ago, and there had been no temperature increase found near the uplifts. On March 10, 2004, a biologist discovered 5 dead bison which apparently had inhaled toxic geothermal gases trapped in the Norris Geyser Basin by a seasonal atmospheric inversion. This was closely followed by an upsurge of earthquake activity in April 2004. In 2006, it was reported that the Mallard Lake Dome and the Sour Creek Dome— areas that have long been known to show significant changes in their ground movement— had risen at a rate of 1.5 to 2.4 inches (3.8 to 6.1 cm) per year from mid–2004 through 2006. As of late 2007, the uplift has continued at a reduced rate. These events inspired a great deal of media attention and speculation about the geologic future of the region. Experts responded to the conjecture by informing the public that there was no increased risk of a volcanic eruption in the near future. However, these changes demonstrate the dynamic nature of the Yellowstone hydrothermal system.
Yellowstone experiences thousands of small earthquakes every year, virtually all of which are undetectable to people. There have been six earthquakes with at least magnitude 6 or greater in historical times, including a 7.5‑magnitude quake that struck just outside the northwest boundary of the park in 1959. This quake triggered a huge landslide, which caused a partial dam collapse on Hebgen Lake; immediately downstream, the sediment from the landslide dammed the river and created a new lake, known as Earthquake Lake. Twenty-eight people were killed, and property damage was extensive in the immediate region. The earthquake caused some geysers in the northwestern section of the park to erupt, large cracks in the ground formed and emitted steam, and some hot springs that normally have clear water turned muddy. A 6.1‑magnitude earthquake struck inside the park on June 30, 1975, but damage was minimal.
For three months in 1985, 3,000 minor earthquakes were detected in the northwestern section of the park, during what has been referred to as an earthquake swarm, and has been attributed to minor subsidence of the Yellowstone caldera. Beginning on April 30, 2007, 16 small earthquakes with magnitudes up to 2.7 occurred in the Yellowstone Caldera for several days. These swarms of earthquakes are common, and there have been 70 such swarms between 1983 and 2008. In December 2008, over 250 earthquakes were measured over a four-day span under Yellowstone Lake, the largest measuring a magnitude of 3.9. In January 2010, more than 250 earthquakes were detected over a two-day period. Seismic activity in Yellowstone National Park continues and is reported hourly by the Earthquake Hazards Program of the U.S. Geological Survey.
On March 30, 2014, a magnitude 4.8 earthquake struck almost the very middle of Yellowstone near the Norris Basin at 6.34am; reports indicated no damage. This was the biggest earthquake to hit the park since February 22, 1980.
Over 1,700 species of trees and other vascular plants are native to the park. Another 170 species are considered to be exotic species and are non-native. Of the eight conifer tree species documented, Lodgepole Pine forests cover 80% of the total forested areas. Other conifers, such as Subalpine Fir, Engelmann Spruce, Rocky Mountain Douglas-fir and Whitebark Pine, are found in scattered groves throughout the park. As of 2007, the whitebark pine is threatened by a fungus known as white pine blister rust; however, this is mostly confined to forests well to the north and west. In Yellowstone, about seven percent of the whitebark pine species have been impacted with the fungus, compared to nearly complete infestations in northwestern Montana. Quaking Aspen and willows are the most common species of deciduous trees. The aspen forests have declined significantly since the early 20th century, but scientists at Oregon State University attribute recent recovery of the aspen to the reintroduction of wolves which has changed the grazing habits of local elk.
There are dozens of species of flowering plants that have been identified, most of which bloom between the months of May and September. The Yellowstone Sand Verbena is a rare flowering plant found only in Yellowstone. It is closely related to species usually found in much warmer climates, making the sand verbena an enigma. The estimated 8,000 examples of this rare flowering plant all make their home in the sandy soils on the shores of Yellowstone Lake, well above the waterline.
In Yellowstone's hot waters, bacteria form mats of bizarre shapes consisting of trillions of individuals. These bacteria are some of the most primitive life forms on earth. Flies and other arthropods live on the mats, even in the middle of the bitterly cold winters. Initially, scientists thought that microbes there gained sustenance only from sulfur. In 2005 researchers from the University of Colorado at Boulder discovered that the sustenance for at least some of the diverse hyperthermophilic species is molecular hydrogen.
Thermus aquaticus is a bacterium found in the Yellowstone hot springs that produces an important enzyme (Taq polymerase) that is easily replicated in the lab and is useful in replicating DNA as part of the polymerase chain reaction (PCR) process. The retrieval of these bacteria can be achieved with no impact to the ecosystem. Other bacteria in the Yellowstone hot springs may also prove useful to scientists who are searching for cures for various diseases.
Non-native plants sometimes threaten native species by using up nutrient resources. Though exotic species are most commonly found in areas with the greatest human visitation, such as near roads and at major tourist areas, they have also spread into the backcountry. Generally, most exotic species are controlled by pulling the plants out of the soil or by spraying, both of which are time consuming and expensive.
Yellowstone is widely considered to be the finest megafauna wildlife habitat in the lower 48 states. There are almost 60 species of mammals in the park, including the gray wolf, the threatened lynx, and grizzly bears. Other large mammals include the bison (often referred to as buffalo), black bear, elk, moose, mule deer, white-tailed deer, mountain goat, pronghorn, bighorn sheep, and mountain lion.
Bison graze near a hot spring
The Yellowstone Park bison herd is the largest public herd of American bison in the United States. The relatively large bison populations are a concern for ranchers, who fear that the species can transmit bovine diseases to their domesticated cousins. In fact, about half of Yellowstone's bison have been exposed to brucellosis, a bacterial disease that came to North America with European cattle that may cause cattle to miscarry. The disease has little effect on park bison, and no reported case of transmission from wild bison to domestic livestock has been filed. However, the Animal and Plant Health Inspection Service (APHIS) has stated that bison are the "likely source" of the spread of the disease in cattle in Wyoming and North Dakota. Elk also carry the disease and are believed to have transmitted the infection to horses and cattle. Bison once numbered between 30 and 60 million individuals throughout North America, and Yellowstone remains one of their last strongholds. Their populations had increased from less than 50 in the park in 1902 to 4,000 by 2003. The Yellowstone Park bison herd reached a peak in 2005 with 4,900 animals. Despite a summer estimated population of 4,700 in 2007, the number dropped to 3,000 in 2008 after a harsh winter and controversial brucellosis management sending hundreds to slaughter. The Yellowstone Park bison herd is believed to be one of only four free roaming and genetically pure herds on public lands in North America. The other three herds are the Henry Mountains bison herd of Utah, at Wind Cave National Park in South Dakota and on Elk Island in Alberta.
Elk Mother Nursing Her Calf
To combat the perceived threat of brucellosis transmission to cattle, national park personnel regularly harass bison herds back into the park when they venture outside of the area's borders. During the winter of 1996–97, the bison herd was so large that 1,079 bison that had exited the park were shot or sent to slaughter. Animal rights activists argue that this is a cruel practice and that the possibility for disease transmission is not as great as some ranchers maintain. Ecologists point out that the bison are merely traveling to seasonal grazing areas that lie within the Greater Yellowstone Ecosystem that have been converted to cattle grazing, some of which are within National Forests and are leased to private ranchers. APHIS has stated that with vaccinations and other means, brucellosis can be eliminated from the bison and elk herds throughout Yellowstone.
A reintroduced northwestern wolf in Yellowstone National Park
Starting in 1914, in an effort to protect elk populations, the U.S. Congress appropriated funds to be used for the purposes of "destroying wolves, prairie dogs, and other animals injurious to agriculture and animal husbandry" on public lands. Park Service hunters carried out these orders, and by 1926 they had killed 136 wolves, and wolves were virtually eliminated from Yellowstone. Further exterminations continued until the National Park Service ended the practice in 1935. With the passing of the Endangered Species Act in 1973, the wolf was one of the first mammal species listed. After the wolves were extirpated from Yellowstone, the coyote then became the park's top canine predator. However, the coyote is not able to bring down large animals, and the result of this lack of a top predator on these populations was a marked increase in lame and sick megafauna.
Bison in Yellowstone National Park
By the 1990s, the Federal government had reversed its views on wolves. In a controversial decision by the U.S. Fish and Wildlife Service (which oversees threatened and endangered species), northwestern wolves, imported from Canada, were reintroduced into the park. Reintroduction efforts have been successful with populations remaining relatively stable. A survey conducted in 2005 reported that there were 13 wolf packs, totaling 118 individuals in Yellowstone and 326 in the entire ecosystem. These park figures were lower than those reported in 2004 but may be attributable to wolf migration to other nearby areas as suggested by the substantial increase in the Montana population during that interval. Almost all the wolves documented were descended from the 66 wolves reintroduced in 1995–96. The recovery of populations throughout the states of Wyoming, Montana and Idaho has been so successful that on February 27, 2008, the U.S. Fish and Wildlife Service removed the Northern Rocky Mountain wolf population from the endangered species list.
An estimated 600 grizzly bears live in the Greater Yellowstone Ecosystem, with more than half of the population living within Yellowstone. The grizzly is currently listed as a threatened species, however the U.S. Fish and Wildlife Service has announced that they intend to take it off the endangered species list for the Yellowstone region but will likely keep it listed in areas where it has not yet recovered fully. Opponents of delisting the grizzly are concerned that states might once again allow hunting and that better conservation measures need to be implemented to ensure a sustainable population. Black bears are common in the park and were a park symbol due to visitor interaction with the bears starting in 1910. Feeding and close contact with bears has not been permitted since the 1960s to reduce their desire for human foods. Yellowstone is one of the few places in the United States where black bears can be seen coexisting with grizzly bears. Black bear observations occur most often in the park's northern ranges and in the Bechler area which is in the park's southwestern corner.
Population figures for elk are in excess of 30,000—the largest population of any large mammal species in Yellowstone. The northern herd has decreased enormously since the mid‑1990s; this has been attributed to wolf predation and causal effects such as elk using more forested regions to evade predation, consequently making it harder for researchers to accurately count them. The northern herd migrates west into southwestern Montana in the winter. The southern herd migrates southward, and the majority of these elk winter on the National Elk Refuge, immediately southeast of Grand Teton National Park. The southern herd migration is the largest mammalian migration remaining in the U.S. outside of Alaska.
In 2003 the tracks of one female lynx and her cub were spotted and followed for over 2 miles (3.2 km). Fecal material and other evidence obtained were tested and confirmed to be those of a lynx. No visual confirmation was made, however. Lynx have not been seen in Yellowstone since 1998, though DNA taken from hair samples obtained in 2001 confirmed that lynx were at least transient to the park. Other less commonly seen mammals include the mountain lion and wolverine. The mountain lion has an estimated population of only 25 individuals parkwide. The wolverine is another rare park mammal, and accurate population figures for this species are not known. These uncommon and rare mammals provide insight into the health of protected lands such as Yellowstone and help managers make determinations as to how best to preserve habitats.
Eighteen species of fish live in Yellowstone, including the core range of the Yellowstone cutthroat trout—a fish highly sought by anglers. The Yellowstone cutthroat trout has faced several threats since the 1980s, including the suspected illegal introduction into Yellowstone Lake of lake trout, an invasive species which consume the smaller cutthroat trout. Although lake trout were established in Shoshone and Lewis lakes in the Snake River drainage from U.S. Government stocking operations in 1890, it was never officially introduced into the Yellowstone River drainage. The cutthroat trout has also faced an ongoing drought, as well as the accidental introduction of a parasite—whirling disease—which causes a terminal nervous system disease in younger fish. Since 2001, all native sport fish species caught in Yellowstone waterways are subject to a catch and release law. Yellowstone is also home to six species of reptiles, such as the painted turtle and Prairie rattlesnake, and four species of amphibians, including the Boreal Chorus Frog.
311 species of birds have been reported, almost half of which nest in Yellowstone. As of 1999, twenty-six pairs of nesting bald eagles have been documented. Extremely rare sightings of whooping cranes have been recorded, however only three examples of this species are known to live in the Rocky Mountains, out of 385 known worldwide. Other birds, considered to be species of special concern because of their rarity in Yellowstone, include the common loon, harlequin duck, osprey, peregrine falcon and the trumpeter swan.
As wildfire is a natural part of most ecosystems, plants that are indigenous to Yellowstone have adapted in a variety of ways. Douglas-fir have a thick bark which protects the inner section of the tree from most fires. Lodgepole Pines —the most common tree species in the park— generally have cones that are only opened by the heat of fire. Their seeds are held in place by a tough resin, and fire assists in melting the resin, allowing the seeds to disperse. Fire clears out dead and downed wood, providing fewer obstacles for lodgepole pines to flourish. Subalpine Fir, Engelmann Spruce, Whitebark Pine, and other species tend to grow in colder and moister areas, where fire is less likely to occur. Aspen trees sprout new growth from their roots, and even if a severe fire kills the tree above ground, the roots often survive unharmed because they are insulated from the heat by soil. The National Park Service estimates that in natural conditions, grasslands in Yellowstone burned an average of every 20 to 25 years, while forests in the park would experience fire about every 300 years.
About thirty-five natural forest fires are ignited each year by lightning, while another six to ten are started by people— in most cases by accident. Yellowstone National Park has three fire lookout towers, each staffed by trained fire fighters. The easiest one to reach is atop Mount Washburn, though it is closed to the public. The park also monitors fire from the air and relies on visitor reports of smoke and/or flames. Fire towers are staffed almost continuously from late June to mid-September— the primary fire season. Fires burn with the greatest intensity in the late afternoon and evening. Few fires burn more than 100 acres (40 ha), and the vast majority of fires reach only a little over an acre (0.5 ha) before they burn themselves out. Fire management focuses on monitoring dead and down wood quantities, soil and tree moisture, and the weather, to determine those areas most vulnerable to fire should one ignite. Current policy is to suppress all human caused fires and to evaluate natural fires, examining the benefit or detriment they may pose on the ecosystem. If a fire is considered to be an immediate threat to people and structures, or will burn out of control, then fire suppression is performed.
In an effort to minimize the chances of out of control fires and threats to people and structures, park employees do more than just monitor the potential for fire. Controlled burns are prescribed fires which are deliberately started to remove dead timber under conditions which allow fire fighters an opportunity to carefully control where and how much wood is consumed. Natural fires are sometimes considered prescribed fires if they are left to burn. In Yellowstone, unlike some other parks, there have been very few fires deliberately started by employees as prescribed burns. However, over the last 30 years, over 300 natural fires have been allowed to burn naturally. In addition, fire fighters remove dead and down wood and other hazards from areas where they will be a potential fire threat to lives and property, reducing the chances of fire danger in these areas. Fire monitors also regulate fire through educational services to the public and have been known to temporarily ban campfires from campgrounds during periods of high fire danger. The common notion in early United States land management policies was that all forest fires were bad. Fire was seen as a purely destructive force and there was little understanding that it was an integral part of the ecosystem. Consequently, until the 1970s, when a better understanding of wildfire was developed, all fires were suppressed. This led to an increase in dead and dying forests, which would later provide the fuel load for fires that would be much harder, and in some cases, impossible to control. Fire Management Plans were implemented, detailing that natural fires should be allowed to burn if they posed no immediate threat to lives and property.
1988 started with a wet spring season although by summer, drought began moving in throughout the northern Rockies, creating the driest year on record to that point. Grasses and plants which grew well in the early summer from the abundant spring moisture produced plenty of grass, which soon turned to dry tinder. The National Park Service began firefighting efforts to keep the fires under control, but the extreme drought made suppression difficult. Between July 15 and 21, 1988, fires quickly spread from 8,500 acres (3,400 ha; 13.3 sq mi) throughout the entire Yellowstone region, which included areas outside the park, to 99,000 acres (40,000 ha; 155 sq mi) on the park land alone. By the end of the month, the fires were out of control. Large fires burned together, and on August 20, 1988, the single worst day of the fires, more than 150,000 acres (61,000 ha; 230 sq mi) were consumed. Seven large fires were responsible for 95% of the 793,000 acres (321,000 ha; 1,239 sq mi) that were burned over the next couple of months. A total of 25,000 firefighters and U.S. military forces participated in the suppression efforts, at a cost of 120 million dollars. By the time winter brought snow that helped extinguish the last flames, the fires had destroyed 67 structures and caused several million dollars in damage. Though no civilian lives were lost, two personnel associated with the firefighting efforts were killed.
Contrary to media reports and speculation at the time, the fires killed very few park animals— surveys indicated that only about 345 elk (of an estimated 40,000–50,000), 36 deer, 12 moose, 6 black bears, and 9 bison had perished. Changes in fire management policies were implemented by land management agencies throughout the United States, based on knowledge gained from the 1988 fires and the evaluation of scientists and experts from various fields. By 1992, Yellowstone had adopted a new fire management plan which observed stricter guidelines for the management of natural fires.
from Wikipedia