Exam 16: Population Regulation

The environmental stress hypothesis suggests predation causes the highest levels of mortality under __________ environmental stress.

Cod feed on small fish and crabs, which in turn feed on large bodied zooplankton. Zooplankton in turn feed on phytoplankton which themselves use up nitrates in the water. If cod were overfished which organisms should decrease?

The idea that predators control herbivore numbers, which in turn permits increased plant growth, is known as

In a population of moths, if predation and parasitism are both density dependent, overwintering loss is density independent and disease is inversely density dependent, what is likely the key factor?

The key factor for most insects seems to be predation.