Exam 12: Predation

Which statement about predators and prey is true?

In Huffaker's studies of an herbivorous mite and its mite predator, when predator and prey were in a heterogeneous environment,

In Krebs and colleagues' study of snowshoe hare cycles, which of the following was a plausible reason for the failure of the "+Food/‒Predator" treatment to stop hare population declines late in the cycle?

Refer to the figure. What year was the +Food/-Predators hare density 400/km² and decreasing?

In Huffaker's studies of an herbivorous mite and its mite predator, which variable was critical in determining whether the populations of predator and prey would go extinct quickly or persist?

Refer to the figure. Based on data in the figure, a newly discovered seed could be hypothesized to have a nitrogen content of _______?

All of the following factors can prevent predators from driving prey to extinction except

Moths resting on the trunks of trees often resemble the tree bark so that potential predators do not perceive them as prey. This is an example of

Which of the following is not a difference between herbivores and carnivores?

Schoener and Spiller's studies, in which lizards were introduced into islands in the Bahamas, showed that lizards _______ the densities of common spiders and _______ the densities of rare spiders.

Based on Schoener and Spiller's studies of spider densities in the Bahamas, what is the correct ranking, from highest to lowest, of the probability of spiders going extinct on three different islands: islands on which lizards are absent, islands on which lizards have been introduced, and islands on which lizards are present naturally?

Which statement about the effects of herbivory on tobacco is false?

Use the following simple predator-prey relationships to answer the question (assume no other interactions exist in this system): Mice eat grain grown by a farmer before it can be harvested. The mice are consumed by several species of snakes, which themselves are consumed by hawks. Local farmers would like to use a biological, as opposed to a chemical, means to protect their crop. What would be the most effective way for farmers in this area to protect their grain crop naturally? Why?

Suppose that rabbits are the only prey and food supply of foxes, and that the predator‒prey interaction follows Lotka‒Volterra dynamics. The mortality rate of foxes in the absence of rabbits is 0.1 per week, and the intrinsic growth rate of rabbits in the absence of predation is 0.2 per week. The capture efficiency is 0.002, and the efficiency at which rabbit biomass is converted into fox biomass is 0.2. If there are 30 foxes in a population, and 400 rabbits are present, the rate at which prey will be killed is _______ per week.

The hormone _______ stimulates the release of stored glucose to make it available to muscles.

Suppose that rabbits are the only prey and food supply of foxes, and that the predator‒prey interaction follows Lotka‒Volterra dynamics. The mortality rate of foxes in the absence of rabbits is 0.1 per week, and the intrinsic growth rate of rabbits in the absence of predation is 0.2 per week. The capture efficiency is 0.002, and the efficiency at which rabbit biomass is converted into fox biomass is 0.2. If there are initially 30 foxes and 400 rabbits, the net growth rate in the fox population will be a _______ of _______ per week.

Which statement about garter snakes and TTX is true?

Suppose that rabbits are the only prey and food supply of foxes, and that the predator‒prey interaction follows Lotka‒Volterra dynamics. The mortality rate of foxes in the absence of rabbits is 0.1 per week, and the intrinsic growth rate of rabbits in the absence of predation is 0.2 per week. The capture efficiency is 0.002, and the efficiency at which rabbit biomass is converted into fox biomass is 0.2. If the number of rabbits doubles and the number of foxes also doubles, the number of rabbits that are killed will

The secondary compounds that are produced by oaks to reduce herbivory are an example of a(n)

In a predator‒prey system functioning according to Lotka‒Volterra dynamics, an increase in the efficiency (b) by which prey biomass is converted into predator biomass should _______ the long-term average number of prey.