*

*

En Biodiversidad virtual

y también en Twiter

*

*

El fitoplancton en el Lago de Sanabria sigue experimentando profundas transformaciones debido al desequilibrio que sufre este ecosistema como consecuencia de los vertidos contaminantes de aguas fecales que llegan a él de nuevo. Todo ello después de un paréntesis de verano en el que camiones cisterna diariamente han recogido de las depuradoras que no funcionan el "agua de colonia" que ha venido vertiéndose impunemente en él, año tras año, excepto por vez primera estos meses pasados de verano.

Quizá el aspecto más destacado de la situación actual del estado trófico del agua del Lago es que la mayoría de las especies de algas que conforman el fitoplancton de este ecosistema aparecen en toda la columna de agua muertas o gravemente enfermas, afectadas por la infección de hongos quitridiales de diferentes géneros. Apenas se encuentran vivas un 2% de todas las especies halladas entre cianobacterias, clorofíceas, diatomeas, désmidos, crisofíceas o dinoflagelados.

Cascarones vacíos de algas, masas de detritus, esporas y restos orgánicos son el panorama que refleja un análisis microscópico de estas aguas bajo el que está detrás la acción de los hongos y un exceso de nutrientes debido al aporte de aguas sin depurar que tanto daño está haciendo al Lago.

A lo largo del mes de agosto, tras el florecimiento masivo de la diminuta Coenocystis planctonica y su rápida desaparición causada por la infección de un quitridio, el dinoflagelado Peridinium umbonatum se convirtió en el protagonista más destacado del fitoplancton y llegó a representar más de un 85% del total de individuos en él.

A fecha de hoy, apenas un mes después, es difícil encontrar un individuo vivo de Peridinium, pues en algo más de una semana, otro hongo también quitridio, en esta ocasión del género Phlyctochytrium ha arrasado sus poblaciones.

En la imagen se aprecia una célula de Peridinium umbonatum infectada por dos individuos del hongo Phlyctochytrium sp. En ella se puede ver cómo el protoplasma del dinoflagelado se encuentra separado de la teca y de la pared celular y se halla concentrado hacia el centro, un claro indicio de que la célula está ya muerta o moribunda. Los esporangios de estos hongos se encuentran ya completamente maduros y han liberado las zoosporas que contenían y que probablemente infectarán nuevas células.

Se sabe que Phlyctochytrium es principalmente un hongo saprófito que se nutre de la materia orgánica en descomposición, pero de forma secundaria puede comportarse como parásito y este comportamiento se ha asociado por algunos autores con el estrés, debido a la presión humana que sufren los ecosistemas en los que aparece. En el Lago Kinneret de Israel, el hongo Phlyctochytrium acabó con toda la población de Peridinium gatunense en poco más de una semana en el año 2000. En el 2014, un proceso similar parece estar ocurriendo también en el Lago de Sanabria.

...sin embargo, para las "autoridades competentes" nada ha cambiado en el Lago de Sanabria, todo sigue igual, incluso ha mejorado.

La imagen, tomada a 1000 aumentos con la técnica de contraste de fase, procede de una muestra integrada de agua recogida el día 13 de octubre de 2014 en la zona central del Lago de Sanabria por Laura e Ismael desde el catamarán, Helios Sanabria .

presentación ponencia congreso internacional de Limnología

informes de contaminación en el Lago de Sanabria

informe de evolución de la contaminación en el Lago de Sanabria

vídeo

Experiments

OUT of the BOX : www.facebook.com/pages/OUT-of-the-BOX/1418798221669769

another experiment ,photoshop gots much function , to much for a life

thank you keko for modeling

Another experiment. The white rounds are MOP. Just love them. Hope to get more of them too. lol

Experiments

Just a study for mood and atmosphere. Graphite + acrylics and collage on Moleskine.

Title: Astronomy Experiment Module

Catalog #: 08_01315

Additional Information: Artist's Conception

Repository: San Diego Air and Space Museum Archive

My thirty-first weekly build for Andromeda's Gates on Eurobricks. Full story here.

Experiments

s131e007868 (08 April 2010) – NASA astronauts T.J. Creamer and Stephanie D. Wilson, and Japanese Aerospace Exploration Agency astronauts Naoko Yamazaki and Soichi Noguchi work in the Japanese Kibo Laboratory during the STS-131 mission to the International Space Station.

Expérimentation avec les rayons du soleil.

playing with brushes

Opdracht 3: Experiment Verliefd

Model: Florian Aendekerk

..."it was more honest my experience with water and circles of life"...

A concrete pump operator finished work here at this location and begins folding down to relocate. This construction site is part of highway Interstate 69 In Rosenberg, Texas, near Houston. In support of America’s international trade routs, when finished, the highway will stretch border to border across America and connect Mexico to Canada. The project will take decades to finish.

Model: Yasmine Moghimi

MUA: Kayla Huotari-Harris

Hasselblad 503CX, 60mm CF, Agfa APX 25, Rodinal 1+99, 60mins, agitate 1st minute continuously, invert at 30 minutes.

aka Brain Fart #2. Refer to Experiment #1 for an explanation. So I think compositionally the balance is a little out but I'm loving what's going on with the front of the building and tree. I'm thinking I might take this approach to some landscapes and see where it leads.

Technical properties:

Camera: Canon EOS 50D

Lens: Sigma 70-200mm f/2.8 EX DG Makro HSM II

Processing-program: Adobe Photoshop CS4

Framed and signature: Photo Scape

Copyright © 2009 by pixel@work . All rights reserved.

Experimenting.

...fire breathing

Posters by Rosmarie Tissi

This was a shot I took at the IMATS Convention in Toronto and then decided to have some fun with textures and layers...

Heyy sexy ;D

Jk, Jk.

Though there is something I love about Halloween effects on PicMonkey...lol

Anyway, have you guys thought about what you want to be for Halloween?

Well this year, I'm going as a zombie nurse. I have thing for homemade costumes. They just seem more original :) My mom has agreed to let me have a pair of her old scrubs to tear up and mess with. Then I have a cheap-o makeup kit from the dollar store that has some thing i'm able to use. All I need is some more stage blood and a recipe for artificial wounds- and wah-la, I'm a zombie.

Geez, this seems longg.

So yeah c:

What will you be this Halloween?

I have experimented with this image to see if it succesfull to the Flickr audience.

I've found that I have slowly adapted to apprieciate the art of abstract photography, but I feel I haven't yet quite mastered the art. I would be hugely greatful if you would leave a comment to give your opinion on how the photo turned out. Thanks :)

Did this for my Drawing class but ended up photographing and I just felt like sharing it.

I am now obsessed with hair combs! Looking for lots and lots of things to sew onto them :D

experimenting

Prototype of my DIY ArnoFlash with Led Module Type 1 mounted on a Canon 350D. Status april 2015.

Experimenting with smoke...it's tough! Inspired by Myla Kent to try this.

Experimenting with long exposures. I need to figure out how to prevent the lens flare, more time behind the lens is needed.

FOV: 4" wide.

This experiment demonstrates the shift in color from yellow-green to blue-green of minerals containing the uranyl ion in conjunction with carbonates.

On the right ~15mL of calcined garden gypsum (rinsed) was combined with 7.5mL of a boiling solution containing sodium chloride, sodium carbonate and uranyl nitrate in an aluminum form. The mixture released much gas (CO2 ?).

On the left ~15mL of DAP Plaster of Paris (containing CaCO3) was combined with 7.5mL of the cooled previously mentioned solution after it had been treated with HCl to remove the carbonate ions. The still acidic solution reacted with the CaCO3 in the Plaster of Paris mix and was mostly neutralized by the CaCO3 becoming CaCl2 and CO2 gas (and H2O). The mixture was left to set in a plastic form.

Contains:

Uranyl with carbonate (FL Blue-green >BL/UVabc)

Uranyl without carbonate (FL Yellow-green >BL/UVabc)

Shown under UVc light.

Key:

WL = White light (halogen + LED)

FL = Fluoresces

PHOS = Phosphorescent

Blue = 450nm,

UVa = 368nm (LW), UVb = 311nm (MW), UVc = 254nm (SW)

'>' = "stimulated by:", '!' = "bright", '~' = "dim"

Uranyl + Carbonate Based Fluorescence

9Nov2015

Much appreciation to Gordon Czop for the uranyl nitrate.

Series best viewed in Light Box mode using Right and Left arrows to navigate.

Photostream best viewed in Lightbox mode (in the dark).

18 Watt Triple Output UV lamp from Polman Minerals - Way Too Cool UV lamps

please view in lightbox

for a laugh you must watch this video sent to me by my dear friend Tao of Jonathan it is simply adorable and a guaranteed smile!

youtu.be/ejZnPz0B4xQ

She has not been on Flickr in a while, so some of you may not know my sweet companion of fourteen years, yes this little beauty is fourteen years old..

We have welcomed many years together, and will do so again this New Year's Eve, with maybe a friend or two who may drop by for an egg nog.

Notice her littlefblack heart on her nose. It was not there the first year of her life, and one day it just appeared, honestly.

Have a great day,

billie

Experiment