Exam 12: Population Growth and Regulation

Use the following information and life tables to answer questions 44 to 46. Recently, it has been hypothesized that coyotes living in urban environments can control the populations of geese living in public parks. To test this hypothesis, a biologist compares two populations of geese. Coyotes are removed from one park but allowed to remain in another park. Both populations contain 1000 geese when the experiment begins. -Which goose life stage is affected by predation from coyotes? I. survival from egg to juvenile II. survival from juvenile to adult III. fecundity of adults

A biologist is studying a population of raccoons that live in a park. The population contains 50 males and 50 females. The biologist determines that R₀ = 2. How many female raccoons are expected to be in the park next year?

In the logistic growth model, which term determines how quickly a population will initially grow from low density?

In the logistic growth model, under which condition is the per capita rate of increase the highest?

Consider a biologist who is studying a fish. The biologist conducts an experiment with four treatments in artificial ponds of the same size. In the first treatment he adds 10 fish to each pond. In the second treatment he adds 100 fish to each pond. In the third treatment he adds 10 fish and additional food. In the fourth treatment he adds 100 fish and additional food. At the end of the experiment he finds that female fish in ponds with only 10 fish produce many more eggs than female fish in ponds with 100 fish. However, adding food did not alter the number of eggs each female fish produced. Explain what this experiment tells us about how these fish are affected by density-independent, positive density-dependent, or negative density-dependent factors.

You are a biologist studying a small fish that reproduces once every summer. In 2014, you add different numbers of this fish to five ponds-Sunny, Slimy, Lazy, Lucky, and Yucky-that do not contain any other fish. These five ponds are the same size and have the same environmental conditions. You return the next summer and estimate fish population size in 2015. Which of the following is supported by the data?

The age structure of a population is often represented by a pyramid. What does an age structure pyramid with a broad base and a narrow top indicate about a population?

Consider a biologist studying a population of deer. At the beginning of the year, there are 100 adult deer in the population. Over the course of the year, 15 adult deer die, and an additional 25 deer are born. What can we conclude about λ for this year?

In the exponential growth model, which term indicates the intrinsic rate of increase?

-The figure shows the change in population size of Paramecium from Gause's experiment, raised in either high-food or low-food conditions. Based on this figure, how was the logistic growth model for Paramecium changed by adding food?

For 5 years a biologist studied a population of mice living in a field. The mice have three age classes: 1 year old, 2 years old, and 3 years old. The number of individuals in each age class over the course of the study is shown in the table. Use these data to answer questions 51 and 52. -The geometric mean growth rate (λ) from year 1 to year 2 is

A park biologist is planting saplings (young trees) in an old field that has recently been turned into a park. Draw a hypothetical self-thinning curve for these trees over 5 years. Be sure to label the axes. Describe a practical use of this curve.

Under positive density dependence, population growth rate

Which is consistent with the results of this experiment?

Applying life tables to sea turtle conservation demonstrated that the most effective way to increase sea turtle populations is to

When a population has a stable age distribution,

Use this figure for questions 2 and 3. -Which plot is consistent with a geometric growth model in which λ = 1?

Negative density dependence occurs when the

This plant species is has a(n)

All cohort life tables