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Exam 53: Population Ecology

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Question 41

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Which of the following groups would be most likely to exhibit uniform dispersion?

A) red squirrels, who actively defend territories
B) cattails, which grow primarily at edges of lakes and streams
C) dwarf mistletoes, which parasitize particular species of forest tree
D) moths, in a city at night
E) lake trout, which seek out cold, deep water high in dissolved oxygen

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Question 42

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In models of logistic population growth,

A) the population growth rate slows dramatically as N approaches K.
B) new individuals are added to the population most rapidly at the beginning of the population's growth.
C) new individuals are added to the population as N approaches K.
D) only density-dependent factors affect the rate of population growth.
E) carrying capacity is never reached.

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Question 43

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The following questions refer to Figure 53.3, which depicts the age structure of three populations. Figure 53.3 -Assuming these age-structure diagrams describe human populations, which population(s) is (are) likely to experience zero population growth (ZPG) ?

Starting from a single individual, what is the size of a population of bacteria that reproduce by binary fission every 20 minutes at the end of a 2-hour time period? (Assume unlimited resources and no mortality.)

A population is correctly defined as having which of the following characteristics? I.inhabiting the same general area II.belonging to the same species III.possessing a constant and uniform density and dispersion

Carrying capacity is

Based on current growth rates, Earth's human population in 2012 will be closest to

Which variables define the ecological life history of a species?

Which of the following graphs illustrates the population growth curve of single bacterium growing in a flask of ideal medium at optimum temperature over a 24-hour period?

Why does the 2009 U.S. population continue to grow even though the United States has essentially established a ZPG?

To construct a reproductive table for a sexual species, one needs to

In which of the following situations would you expect to find the largest number of K-selected individuals?

Often the growth cycle of one population has an effect on the cycle of another. As moose populations increase, for example, wolf populations also increase. Thus, if we are considering the logistic equation for the wolf population, DN/dt = rN , which of the factors accounts for the effect on the moose population?

Which of the following is most likely to contribute to density-dependent regulation of populations?

The following questions refer to Figure 53.3, which depicts the age structure of three populations. Figure 53.3 -Which population(s) appear(s) to be stable?

The observation that members of a population are uniformly distributed suggests that

Which of the following was the most significant limiting factor in human population growth in the 20th century?

Which of the following assumptions have to be made regarding the capture-recapture estimate of population size? I.Marked and unmarked individuals have the same probability of being trapped. II.The marked individuals have thoroughly mixed with the population after being marked. III. No individuals have entered or left the population by immigration or emigration, and no individuals have been added by birth or eliminated by death during the course of the estimate.

During the spring, you are studying the mice that live in a field near your home. The population density is high, but you realize that you rarely observe any reproductive female mice. This most likely indicates