Answers please When a population that exhibits logistic growth is impacted by de

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When a population that exhibits logistic growth is impacted by delayed density dependence, when would we expect a stable limit cycle to develop? a. This is a trick question because delayed density dependence always results in a stable limit cycle b. When rT is intermediate c. When rT is very large d. When rT is very small Which of the following is NOT a reason why small populations are generally at a higher risk of extinction than larger ones? a. Smaller populations will experience a higher level of adaptive evolution than larger ones, which can prevent them from interbreeding with other populations of the same species b. The effects of genetic drift are larger when populations are small, which can lead to a loss of genetic variation and a decreased chance of future adaptive evolution c. Smaller populations are more likely to be impacted by inbreeding depression, which can lead to an increased expression of recessive deleterious traits d. A small population is more likely to be wiped out by environmental stochasticity than if the population was larger in size e. Allee effects can occur if individuals are negatively impacted by decreased population densities True or False: Even when suitable habitat remains, a metapopulation can go extinct. True False

Explanation / Answer

3) Delayed density dependence is the delays in the effect that the density has on the population size. Delayed density dependence can contribute to fluctuations in population size. The number of individuals born in a particular time is dependent on the population densities that were present several time periods ago.

The logistic equation with time lags is given by the formula,

dN/dt = rN [1 - (N(t-T)/k)]

N(t-T) is the population size at time (t-T) in the past.

According to this equation,

when, rT is small, there is no change in logistic growth curve

when rT is intermediate, we will observe dampened oscillations in the logistic growth curve and

when rT is large, we will get stable limit cycle

Therefore, the answer for this question is option (c) when rT is very large, stable limit cycle develops in logistic growth curve.

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