Question

Consider a wetland ecosystem similar to the one shown in the image below. In this ecosystem are two species: a small fish species and a wading bird species that feeds on the small fish as its main source of food. Oxygen levels are a limiting factor.
Suppose that the local temperature changes in favor of greater oxygen levels in the water. Write a short paragraph to describe how both the population of the small fish species and the wading bird population would change in response to the new oxygen levels over the next six months. Then explain why these changes occur.


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Answer 1

Explanation:  The increase oxygen level allows more fish to survive in the wetland ecosystem. The fish numbers level off at some point because the added oxygen only allows certain amount of population  increase up to a maximum limit. The wading bird population also show an increase in population numbers over time, but the change occurs sometimes after the fish increase, because the fish population increases is the cause for birds population increases. The bird number also level off because the amount of fish available limits the amount of birds that can survive in this ecosystem. The wading bird and the fish have a predator-prey relationship.

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Answer 2

If the local temperature changes in favor of greater oxygen levels in the water, the population of the small fish species and the wading bird population would be changed and affected NEGATIVELY in response to the newly elevated oxygen levels over the next six months.

High levels of oxygen over an extended period of time would cause the fish to eventually become sick and to die. This would leave the wading bird species without nourishment for life and energy reproduction leading to the depletion of the bird species along with the small fish species.