Field Observation Suggests That Populations of a Particular Species of Herbivorous

question 35

Multiple Choice

Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in density at three- to five-year intervals. Which of the following represent (a) plausible explanation(s) of these cycles?

• A)Periodic crowding affects the endocrine system, resulting in increased aggressiveness.
• B)Increases in population density lead to increased rates of predation.
• C)Increases in rates of herbivory lead to changes in the nutritive value of plants used as food.
• D)Increases in population density lead to more proximal infestations of parasites to host animals.
• E)All of the above are plausible explanations of population cycling.

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