Exam 54: Populations

In the guppies studied by David Resnick, variations in levels of predation (and environmental variability) eventually led to _______ change in the guppy populations.

A species of frog occupies a habitat consisting of wetlands that dry up seasonally, forming a region of aquatic and terrestrial patches.During the rainy season, the entire area is wet, and frogs range throughout the habitat, mating with any available frog and laying their eggs anywhere.During the dry season, frogs remain in the nearest aquatic patch.Would the frogs in this habitat be considered a metapopulation?

The events that bring new members into a population are birth and _______.

The human population growth rate has slowed since reaching its maximum rate in the 1960s.A decrease in which factor is most likely responsible for slowing the growth rate?

If the per capita death rate within a population exceeds the per capita birth rate, the population size is

Refer to the figure showing three basic dispersion patterns. Which organisms would be most likely to show a random dispersion?

A study of red oak trees in a particular forest showed that, on average, there are 5.3 trees per 10 m² quadrat.This result describes the red oak population's

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

Two equations are often used to describe population growth: What is the difference between the solutions of these two equations, N_t and ∆N?

A study of pikas in a mountainous region of California finds 50 discrete population patches.Counts of the number of individuals in each population are done every 5 years.These counts show that all populations are in decline.After 10 years, 7 populations have become extinct, and after 20 years, 21 have become extinct.None of the patches that went extinct at year 10 are populated again at year 20.This scenario illustrates

An organic farmer releases parasitic wasps to eat the aphids that are attacking the leaves of his plants.This form of plant management is known as _______.

The sage plant secretes toxins that kill off surrounding plants in a circle around each plant.This results in which type of dispersion pattern?

A fishery manager is trying to recover a population that has been overfished.To maximize the number of fish that can be harvested from this population, the manager should try to keep the population

If 400 robins are found in a ten-hectare plot, the density of robins in that plot is

A population growing without environmental limits would

Researchers are studying a pod of dolphins near the California coast.They watch the dolphins from boats and are able to recognize individual dolphins by characteristic shapes and scarring on their dorsal fins.They document these differences with photographs and have access to occasional airplane surveillance of the pod.The best method for determining the population size of this pod would be the _______ method.

In which situation is the growth rate and size of a population most likely to be limited by space?

Intensive fishing of the black rockfish population in the Pacific Northwest changed the average size of individual rockfish.Later generations of rockfish became smaller because fishermen selective-caught the _______ fish.

For a population of bears, birth and death rates are equal during one year.According to the population growth equation, any change in population size will be determined by

A fruit fly population is kept in bottles in the lab and fed with yeast.Initially, the yeast is growing more quickly than the fruit fly population, but as the fruit fly population grows, it begins to deplete the yeast population.When this occurs, the fruit fly population will begin to exhibit what type of growth?