Which of the following graphs illustrates the growth curve of a small population of rodents that has grown to reach a static carrying capacity? Which of the following is a likely graphic outcome of a population of deer introduced to an island with an adequate herbivory and without natural predators, parasites, or disease? Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in density at three to five year intervals

1. Which of the following graphs illustrates the growth curve of a small population of rodents that has grown to reach a static carrying capacity?

logistic population growth model graph?

2. Which of the following is a likely graphic outcome of a population of deer introduced to an island with an adequate herbivory and without natural predators, parasites, or disease?

grows at first, then makes a straight vertical line on time

3. Field observation suggests that populations of a particular species of herbivorous mammal undergo cyclic fluctuations in density at three to five year intervals. Which of the following represent (a) plausible explanation(s) of these cycles?

Periodic crowding affects the endocrine system resulting in increasing aggressiveness, increases in population density lead to increased rates of predation, increases in rates of herbivory lead to changes in the nutritive value of plants used as food, increases in population density lead to more proximal infestations of parasites to host animals

4. Which of the following is an incorrect statement about the regulation of populations?

Density-independent factors have an increaisngly greater effect as a populations density increases

5. Which of the following is a density-independent factor limiting human population growth?

earthquakes

6. A population of white footed mice becomes severely overpopulated in a habitat that has been disturbed by human activity. Sometimes intrinsic factors cause the population to increase in mortality and lower reproduction rates in reaction to the stress of overpopulation. Which of the following is an example of an intrinsic population control?

Females undergo horomonal changes that delay sexual maturation and many individuals suffer depressed immune systems and die due to the stress of overpopulation

7. Why is territoriality an adaptive behavior for songbirds maintaining populations at or near their carrying capacity?

Songbird males defend territories commensurate with the size from which they can derive adequate resources for themselves, their mate, and their chicks

8. Consider several human populations of equal size and net reproductive rate, but different in age structure. The population that is likely to grow the most during the next 30 years is the one with the greatest fraction of people in which age range?

10 to 20 years

9. Which population appears to be stable

III

10. Assuming these age-structure diagrams describe human populations, in which population is underemployment likely to be a societal issue in the future?

I