Introduced Species Are a Problem All Over the World, and There

question 44

Multiple Choice

Introduced species are a problem all over the world, and there are many examples in the United States. Several years ago, a fisherman caught a northern snakehead fish in a pond in Crofton, Maryland (a suburb of Washington, DC) . It was suspected that the fish in the Crofton pond were purchased locally and then intentionally released. Snakeheads are top predators, and 90% of the northern snakeheads' diet consists of other fishes. The northern snakehead can breathe out of water and travel short distances (about 100 feet) across land. They also breed rapidly. Females can lay more than 100,000 eggs per year. Juveniles have also been identified in the Potomac River and other rivers in Pennsylvania.
-When snakeheads enter aquatic ecosystems, biodiversity in these ecosystems would most likely

• A) increase, since another species has been added to the environment.
• B) decrease, since the snakehead will prey on native species.
• C) remain the same, since local species will prey on the snakeheads and remove them.
• D) remain the same, because the snakeheads will merge without problems into established communities.

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Definitions:

Purely Competitive Industry

A market structure characterized by many small firms producing identical products where no single firm can influence the market price.

AVC Curve

A graph that illustrates the average variable costs associated with producing different quantities of output, typically showing a U-shaped curve due to economies and diseconomies of scale.

MC Curves

Marginal cost curves, which represent the change in total cost that arises when the quantity produced is incremented by one unit.

Total Fixed Costs

Costs that do not vary with the level of output or sales in the short term, including expenses such as rent, salaries, and insurance.