Exam 53: Population Ecology

The following question refers to the figure below, which depicts the age structure populations. In the figure, populations of a plant species labeled I, II, and III are depicted using simplified age structures containing three age classes: young seedlings, middle-aged juveniles, and older adults. Which population(s) appear(s) to have stable growth?

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

Scientific study of the population cycles of the snowshoe hare and its predator, the lynx, has revealed that

Use the survivorship curves in the figure to answer the following question. Which curve best describes survivorship in marine mollusks?

Which of the following statements regarding the future of populations in developing, less industrialized countries are correct? I.The reproductive rates are predicted to remain below replacement level. II. Survivorship will increase. III.Overall population size will increase dramatically. IV.The fertility rate is predicted to remain high, especially in some regions.

Use the graph to answer the following question. In the figure, which of the arrows represents the carrying capacity?

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?

Which of the following graphs illustrates the population growth curve starting with a single bacterium growing in a flask of ideal medium at optimum temperature over a two-hour period? Assume resources do not become limiting over this time frame.

According to the logistic growth equation below, = rN

Which of the following statements about human populations in industrialized countries is incorrect?

An ecologist recorded 12 white-tailed deer, Odocoileus virginianus, per square kilometer (km²) in one woodlot and 20 km² in another woodlot. What was the ecologist comparing?

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

Which of the following is the most important assumption for the mark-recapture method to estimate the size of wildlife populations?

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

Which of the following graphs illustrates the growth over several seasons of a population of snowshoe hares that were introduced to an appropriate habitat also inhabited by predators in northern Canada?

Which of the following assumptions must be made regarding the mark-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.

Use the graph to answer the following question. Looking at the figure, what factor is contributing significantly to stabilizing the population size over time? I. no migration II. low migration III.high migration

Uniform spacing patterns in plants such as the creosote bush are most often associated with ________.

Which of the following statements about human population in industrialized countries are correct? I.Life history is r-selected. II.The population has undergone the demographic transition. III.The survivorship curve is Type III. IV.Age distribution is relatively uniform.

Use the table to answer the following question. In the accompanying life table of a hypothetical population, what are the missing values for lₓ (y and z)? lₓ = the proportion alive at the start of year (age specific survivorship rate).