BONUS QUESTION (This question is worth 2 extra points, which will be added to your score manually within the next two weeks.) A population demonstrating the strong Allee effect, present only in the critical depensation model, occurs:单项选择题

A

at high population sizes, where the high density of individuals results in negative per capita population growth rates.

B

at low population sizes, where the geographic distribution of individuals contracts, so that the resulting high density of individuals lowers per capita population growth rates that nonetheless remain positive.

C

at high population sizes, all energy in the ecosystem goes to supporting maintaining the population and the population size stabilizes.

D

at low population sizes or density, below which per capita population growth rates become negative, and the population is destined for extinction.

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