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EnvsS20: Herring Gull Soars Over St. Charles Park
This photo of a Herring Gull, Larus argentatus, flying over a lake in the common area of Corner Stone Lake Park was taken on Friday, March 20th, 2020. Herring Gulls build their nests in open areas close to shallow bodies of water. This is done so they can see potential predators and prey. They hunt by soaring to great heights, and plunge-dive to scoop up prey located near shallow water. Typical diets include fish, marine invertebrates, and insects. The natural system observed in the photo is in dynamic equilibrium. This means that there is constant change between inputs and outputs of the system that are directed towards a steady state.
If invasive species (e.g. filter feeder quagga mussels) were introduced to the dynamic system above, it would become a non-steady system. This means that inputs would be far greater than the outputs (or vice versa) and leads to a runaway system. An invasive species is non-native and would competitively exclude native species in the area for resources. This leads to harmful effects on the ecosystem. We are able to prevent true invasions by using the precautionary principle. Anything that we do not fully understand the effects of should be resisted at all costs.
EnvsS20: Herring Gull Soars Over St. Charles Park
This photo of a Herring Gull, Larus argentatus, flying over a lake in the common area of Corner Stone Lake Park was taken on Friday, March 20th, 2020. Herring Gulls build their nests in open areas close to shallow bodies of water. This is done so they can see potential predators and prey. They hunt by soaring to great heights, and plunge-dive to scoop up prey located near shallow water. Typical diets include fish, marine invertebrates, and insects. The natural system observed in the photo is in dynamic equilibrium. This means that there is constant change between inputs and outputs of the system that are directed towards a steady state.
If invasive species (e.g. filter feeder quagga mussels) were introduced to the dynamic system above, it would become a non-steady system. This means that inputs would be far greater than the outputs (or vice versa) and leads to a runaway system. An invasive species is non-native and would competitively exclude native species in the area for resources. This leads to harmful effects on the ecosystem. We are able to prevent true invasions by using the precautionary principle. Anything that we do not fully understand the effects of should be resisted at all costs.