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Exam 53: Population Ecology

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Question 21

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According to the logistic growth equation, $\frac { d N } { d t }$ = rN $\frac { ( K - N ) } { K }$

A) the number of individuals added per unit time is greatest when N is close to zero
B) the per capita growth rate (r) increases as N approaches K
C) population growth is zero when N equals K
D) the population grows exponentially when K is small

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Question 22

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Suppose researchers marked 800 turtles and later were able to trap a total of 300 individuals in that population, of which 150 were marked. What is the estimate for total population size?

A) 200
B) 1,050
C) 1,600
D) 2,100

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Question 23

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Use the figure to answer the following question. In the figure, imagine a different scenario where the death rate per capita was dependent upon (and positively correlated with) the density of the population, and the birth rate was instead density independent. As the density of the population increased, ________.

In 2008, the population of New Zealand was approximately 4,275,000 people. If the birth rate was 14 births for every 1,000 people, approximately how many births occurred in New Zealand in 2008?

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

To measure the population of lake trout in a 250-hectare lake, 400 individual trout were netted and marked with a fin clip, then returned to the lake. The next week, the lake was netted again, and out of the 200 lake trout that were caught, 50 had fin clips. Using the mark-recapture estimate, the lake trout population size could be closest to which of the following?

In July 2008, the United States had a population of approximately 302,000,000 people. How many Americans were there in July 2009, if the estimated 2008 growth rate was 0.88%?

According to the logistic growth equation below, $\frac { d N } { d t }$ = rN $\frac { ( K - N ) } { K }$

Which pair of terms most accurately describes life history traits for a stable population of wolves?

Which of the following examples would most accurately measure the dispersion of a population being studied?

Which of the following is the best natural example of a uniform pattern of dispersion?

Which statements about K are correct? I.K varies among populations. II.K varies in space. III.K varies in time. IV.K is constant for any given species.

Use the graph to answer the following question. In the figure, which of the following survivorship curves most applies to humans living in developed countries?

During exponential growth, a population always

Analyzing ecological footprints reveals that

Use the figure to answer the following question. The figure represents the dynamics of ________.

Long-term studies of Belding's ground squirrels show that immigrants move nearly 2 kilometers from where they are born and become 1%-8% of the males and 0.7%-6% of the females in other populations. On an evolutionary scale, why is this significant?

Population ecologists follow the fate of same-age cohorts to

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, $\frac { d N } { d t }$ = rN $\frac { ( K - N ) } { K }$ ,which of the factors accounts for the effect of the moose population?

Consider two old-growth forests: One is undisturbed while the other is being logged. In which region are species likely to experience exponential growth, and why?