Exam 54: Populations

In this equation for the per capita growth rate, suppose the value for d increases while the value for b remains the same. What happens to the value for r, and to the change in population, ΔN?

The use of parasitic wasps to limit outbreaks of blowflies is an example of _______ control.

Discuss why you would use different methods to estimate the size of populations of large and distinct individuals, compared to populations of small, similar-looking individuals.Specify the method or methods used in each case.

Which statement best describes static life tables?

In an environment with scarce food resources, the size of a population is most likely to be controlled by

A biologist constructs a life table of a population of Thompson gazelles, using data taken during a single sampling.What type of life table is she constructing?

Species that are first to colonize a new habitat (for example, after a disaster such as a fire) are often r-strategists.Characteristics that prepare them to survive in these conditions include all of these except that they

Refer to the table below, which shows hypothetical data for a cohort of robins. The best explanation of survivorship (l_x) is that it is

Study the three dispersion types (A-C) below.Name them, briefly explain the conditions under which each occurs, and provide an example of each.

Humans can reproduce many times throughout their lives.This is an example of a(n) _______ reproductive strategy.

The life cycle of humans can best be described as

Density-independent regulatory factors include all of these except

Refer to the paragraph below. The African wild dog is highly endangered as a result of habitat fragmentation, hunting pressure, and contagious diseases contracted from domestic dogs as humans encroach on the wild dogs' habitat.Hunting, breeding, and pup and adult survival depend on a large pack size, in which individuals cooperate and help one another.This is particularly important because the dogs are relatively small.Historically, the average pack size was about 60 animals; today it ranges from 10 to 20. According to the Allee effect, what is the likely effect on the population of this much smaller pack size?

Five hundred members of a foreign insect species are brought to a new location with a favorable climate, abundant food and shelter, no predators, and no diseases.Over the first few years, one would expect this population to exhibit _______ population growth.

Which situation is an example of a density-independent limiting effect?

When a single bacterium is placed in a culture medium, the resulting population at first grows very quickly; however, as the population expands and uses up its resources, the growth rate eventually slows and stops.Mathematically, this growth pattern is called _______ growth.

A young hen is removed from an uncrowded cage and placed in a small space with many other hens.Which factor is most likely to increase in the hen's new environment?

If the birth rate is 0.07 and the death rate is 0.14, then the per capita growth rate (r) in a population (assuming that there is no immigration or emigration) is

Barnacles are crustaceans that attach themselves to rocks, shells, or other objects in marine habitats.An ecologist who wants to estimate the population of a species of barnacle living along the mid-Atlantic coast would most likely

Kangaroos of the genus Macropus live in specific regions of Australia.M.giganteus is found on the eastern one-third of the continent, M.fuliginosus in the southern and western part, and M.rufus in the semiarid interior.This suggests that the range of these kangaroos is controlled by