DFF: Populations Quiz (Chapter 55)

10. Imagine that two songbird species, one an r-strategist and the other a K-strategist, are driven almost to extinction. Intense conservation efforts are undertaken, and both species begin to recover and increase in number. Which, if either, species should increase in number more quickly, and why? A. Both species should recover equally, since every species has an intrinsic rate of increase. B. The r-strategist species should increase in number more quickly because it matures more quickly to reproductive age. C. The r-strategist species should increase in number more quickly because it has density-independent mortality rates. D. The K-strategist species should increase in number more quickly because it has iteroparous reproduction. E. The K-strategist species should increase in number more quickly because it has a longer life span.

B. The r-strategist species should increase in number more quickly because it matures more quickly to reproductive age.

6. Like other frogs, American bullfrogs have three life stages: egg, tadpole, and adult. Adults live 6 to 7 years and can reproduce each year. To determine the fecundity schedule of a bullfrog population, one would need to determine A. the ratio of adult males to adult females for each year's age class. B. the average number of eggs laid per female per mating season. C. the survivorship rates from eggs to tadpoles and from tadpoles to adults. D. the average number of eggs produced per female over her lifetime. E. the average number of adult offspring produced per female per mating season. See

B. the average number of eggs laid per female per mating season.

8. Which of the following is not a feature of exponential growth in a population? A. Births occur continuously. B. Birth rate is a constant. C. Deaths do not occur. D. The number of new individuals per unit time keeps increasing. E. The graph appears as a continuous upward curve.

C. Deaths do not occur.

3. Which of the following represents the correct ranking of dispersal patterns, from the one that has the greatest average distance between one individual and its nearest neighbor to the one that has the least distance? A. Random > clumped > regular B. Random > regular > clumped C. Regular > random > clumped D. Regular > clumped > random E. Clumped > regular > random

C. Regular > random > clumped

9. Which of the following is an example of a density-independent effect? A. A limit of nesting space in an area to 70 nests B. An increase in the incidence of malaria as populations increase C. The killing of seedlings by drought D. The tendency of aggregations of guppies to attract predators E. None of the above

C. The killing of seedlings by drought

5. If 300 mice in a mouse colony are born in January, and 150 of them are still alive in September, what is the survivorship rate of these mice from January to September? A. 0.15 B. 0.30 C. 0.45 D. 0.50 E. 0.60

D. 0.50

2. In a study of the population density of apple maggot flies, 150 flies are captured and marked in the first sampling. Two days later, 300 flies are captured, 15 of which have marks. Based on these results, the estimated number of apple maggot flies in this population would be A. 300. B. 600. C. 1,500. D. 3,000. E. 6,000.

D. 3,000.

7. Which pattern of survivorship is most likely for an organism such as the sea urchin, which produces large numbers of very small offspring and provides no parental care? A. Most offspring survive for most of their potential life span and then die at the same time. B. The probability of death is low throughout the life span. C. Survivorship is high early in life and declines slowly. D. Young individuals have a high probability of dying, but older individuals have a relatively low probability of dying. E. The probability of death is equally high throughout the potential life span.

D. Young individuals have a high probability of dying, but older individuals have a relatively low probability of dying.

1. If a total of 2,400 oak trees are counted in a 6 km × 2 km rectangular patch of land, the density of the oak trees is _______ per square km. A. 24 B. 48 C. 96 D. 120 E. 200

E. 200

4. Early population ecologists conducted most of their research on small islands rather than on continents because a number of features of island populations make them easier to study. Which of the following is not one of those features? A. Lower immigration B. Lower emigration C. More clearly defined boundaries D. Smaller sizes E. More stability over time

E. More stability over time