Consider a wetland ecosystem similar to the one shown in the image below. In this ecosystem are two species: a small fish and a wadding 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 wadding 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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Because of the increased level of oxygen in the water, more fish will survive. This makes the fish population bigger. This provides more food for the wadding bird species. The wadding bird species will grow because of this. The wadding bird species will soon level out once the population of the fish decreases. Once the oxygen levels decrease the fish population will decrease and so will the wadding bird species.