Stochasticity can be hard to incorporate into population models, though stochast

Question

Stochasticity can be hard to incorporate into population models, though stochastic phenomena often cause population growth rates to vary. Which of the following is NOT an example of a stochastic process that would be hard to model?

A.Individuals in the population competing with each other for resources

B.Disturbances like tornadoes or forest fires that kill large numbers of individuals

C.Variation in the sequence of births and deaths in a small population

D.The unexpected influx of a large number of immigrants

In contrast, some seemingly random fluctuations result from internal processes that are completely deterministic. For example, the discrete logistic equation does a good job of modeling which of these?

A.Allee effects in small populations

B.Age-dependent birth and death rates

C.Delayed density dependence

D.Seasonal variations in food availability

Demographic stochasticity increases extinction risk for small populations.

T or F?

Environmental stochasticity does not affect extinction risk for large populations.

T or F?

Chaotic population fluctuations occur only when environmental or demographic conditions change

T or F?

Explanation / Answer

Stochasticity can be hard to incorporate into population models, though stochastic phenomena often cause population growth rates to vary. Which of the following is NOT an example of a stochastic process that would be hard to model?

D.The unexpected influx of a large number of immigrants

In contrast, some seemingly random fluctuations result from internal processes that are completely deterministic. For example, the discrete logistic equation does a good job of modeling which of these?

D.Seasonal variations in food availability

Demographic stochasticity increases extinction risk for small populations.

T

Environmental stochasticity does not affect extinction risk for large populations.

F

Chaotic population fluctuations occur only when environmental or demographic conditions change

T

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