Question 1

Which statement is not true of lynx and coyote predation of the snowshoe hare?

Accepted Answer

A)   Lynx and coyote both show a strong numerical response to increases in the snowshoe hare population.
B)   Lynx show higher predation rates when snowshoe hare numbers are declining.
C)   Coyotes show higher predation rates when snowshoe hare numbers are increasing.
D)   Coyotes show a clear type 2 functional response to increases in the snowshoe hare population.
E)   At high hare densities, coyote and lynx predation rates exceed their daily energy needs.

Question 2

What methods and/or tools did Cleveland et al. use in their study of Brazilian free-tailed bats? (Select all that apply.)

Accepted Answer

A)   NEXRAD Doppler radar
B)   Ground-based observation
C)   Cotton bollworm survival rates
D)   Radio tagging of bats
E)   Avoided-cost analysis

Question 3

Match each element from a functional response model to its correct meaning.

-N/P

Accepted Answer

A)   handling time
B)   rate of prey availability
C)   per capita availability of prey
D)   prey abundance
E)   searching time

Question 4

Plagiorhynchus worms and Puccinia rusts are parasites that share the ability to change their host's behavior in way that

Accepted Answer

A)   increase the length of time they can survive in their hosts.
B)   decrease their host's mortality rates.
C)   increase their hosts reproduction, thereby increasing production of parasite-infected offspring.
D)   increase the likelihood of their (the parasites')  transmission to a new host.
E)   decrease the hosts' vulnerability to other parasites.

Question 5

Why was the field experiment by Krebs and colleagues so important to our understanding of predator and prey dynamics?

Accepted Answer

A)   Because the researchers were able to manipulate three trophic levels simultaneously in the field and on a large scale
B)   Because the researchers were able to manipulate three trophic levels simultaneously without the influence of complicating factors such as weather cycles
C)   Because the researchers were able to test for the effects of the three trophic levels one at a time, in three separate experiments
D)   Because the researchers were able to manipulate three trophic levels as well as normally complicating factors such as weather and genetics

Question 6

Periodical cicadas spend 13 or 17 years

Accepted Answer

A)   feeding in tree twigs before emerging as adults.
B)   feeding on tree roots before emerging as adults.
C)   as adults before laying eggs.
D)   in a resistant, resting egg before hatching as larvae.
E)   None of the choices are correct.

Question 7

Match each element from a functional response model to its correct meaning.

-N

Accepted Answer

A)   handling time
B)   rate of prey availability
C)   per capita availability of prey
D)   prey abundance
E)   searching time

Question 8

You are studying the response of microscopic predatory nematodes to various prey densities. The nematodes live in soil and have a short life cycle. What model is likely to be the most appropriate?

Accepted Answer

A)   A prey-dependent functional response model
B)   A numerical response model
C)   A ratio-dependent functional response model

Question 9

In most laboratory experiments, predators and prey held together in simple habitats exhibit repeated cycles in population sizes.

Accepted Answer

A) True 
 B)False

Question 10

An organism inducing disease in its host is called a ________.

Accepted Answer

The answer of An organism inducing disease in its host...

Question 11

Match the organism with the correct type of exploitation.
-Plasmodium spp. enter the liver and red blood cells of humans and other vertebrates, sometimes causing malaria.

Accepted Answer

A)   predator
B)   pathogen
C)   parasite

Question 12

Birds are more effective predators than bats on foliage-living arthropods in tropical lowland forests.

Accepted Answer

A) True 
 B)False

Question 13

Match each element from a functional response model to its correct meaning.

-a

Accepted Answer

A)   handling time
B)   rate of prey availability
C)   per capita availability of prey
D)   prey abundance
E)   searching time

Question 14

Neither the prey-dependent model nor the ratio-dependent model of functional response incorporates the number of predators in the environment.

Accepted Answer

A) True 
 B)False

Question 15

Match each element from a functional response model to its correct meaning.

-h

Accepted Answer

A)   handling time
B)   rate of prey availability
C)   per capita availability of prey
D)   prey abundance
E)   searching time

Question 16

Bethel and Holmes demonstrated

Accepted Answer

A)   positive phototaxis in Acanthocephalans infected by amphipods.
B)   negative phototaxis in Acanthocephalans infected by amphipods.
C)   positive phototaxis in amphipods infected by Acanthocephalans.
D)   negative phototaxis in amphipods infected by Acanthocephalans.
E)   increased herbivory by amphipods infected by Acanthocephalans.

Question 17

Which of the following is a result of infection of Arabis by the plant parasite Puccinia monoica?

Accepted Answer

A)   Formation of an elongated rosette topped by a cluster of bright yellow leaves
B)   Formation of a pseudoflower that resembles the flower of a buttercup
C)   Insect transfer of spermatia from one fungus to another
D)   Elimination of seed formation by the host plant
E)   All of the choices are correct.

Question 18

You are designing an experiment to test whether the emergence of large numbers of moths over a short time period provides an effective refuge. You hypothesize that the moths are employing predator satiation. If you are correct, what response do you expect to see in your experiment?

Accepted Answer

A)   The percentage of prey consumed increases sharply as the prey density increases from low to medium, but levels off at high prey densities.
B)   The percentage of prey consumed increases gradually as the prey density increases from low to medium to high.
C)   The percentage of prey consumed remains stable as the prey density increases from low to medium, then decreases at very high prey densities.
D)   The percentage of prey consumed increases sharply as the prey density increases from low to medium, but decreases at high prey densities.

Question 19

Match the organism with the correct type of exploitation.
-A tapeworm lives in the intestines of a dog, where it absorbs nutrients.

Accepted Answer

A)   predator
B)   pathogen
C)   parasite

Question 20

A "negatively phototaxic" amphipod will swim

Accepted Answer

A)   away from parasitic worms.
B)   toward parasitic worms.
C)   away from competing amphipods.
D)   toward light.
E)   away from light.

Exam 14: Exploitative Interactions: Predation, Herbivory, Parasitism, and Disease

A "negatively phototaxic" amphipod will swim

Correct AnswerverifiedShow Answer

In most laboratory experiments, predators and prey held together in simple habitats exhibit repeated cycles in population sizes.

Correct AnswerverifiedShow Answer

Match the organism with the correct type of exploitation. -Plasmodium spp. enter the liver and red blood cells of humans and other vertebrates, sometimes causing malaria.

Correct AnswerverifiedShow Answer

Periodical cicadas spend 13 or 17 years

Correct AnswerverifiedShow Answer

Match the organism with the correct type of exploitation. -A tapeworm lives in the intestines of a dog, where it absorbs nutrients.

Correct AnswerverifiedShow Answer

Neither the prey-dependent model nor the ratio-dependent model of functional response incorporates the number of predators in the environment.

Correct AnswerverifiedShow Answer

Match each element from a functional response model to its correct meaning. -N

Correct AnswerverifiedShow Answer

You are studying the response of microscopic predatory nematodes to various prey densities. The nematodes live in soil and have a short life cycle. What model is likely to be the most appropriate?

Correct AnswerverifiedShow Answer

Which of the following is a result of infection of Arabis by the plant parasite Puccinia monoica?

Correct AnswerverifiedShow Answer

Plagiorhynchus worms and Puccinia rusts are parasites that share the ability to change their host's behavior in way that

Correct AnswerverifiedShow Answer

Birds are more effective predators than bats on foliage-living arthropods in tropical lowland forests.

Correct AnswerverifiedShow Answer

An organism inducing disease in its host is called a ________.

Correct AnswerverifiedShow Answer

Which statement is not true of lynx and coyote predation of the snowshoe hare?

Correct AnswerverifiedShow Answer

You are designing an experiment to test whether the emergence of large numbers of moths over a short time period provides an effective refuge. You hypothesize that the moths are employing predator satiation. If you are correct, what response do you expect to see in your experiment?

Correct AnswerverifiedShow Answer

What methods and/or tools did Cleveland et al. use in their study of Brazilian free-tailed bats? (Select all that apply.)

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Match each element from a functional response model to its correct meaning. -N/P

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Match each element from a functional response model to its correct meaning. -h

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Bethel and Holmes demonstrated

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Why was the field experiment by Krebs and colleagues so important to our understanding of predator and prey dynamics?

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Match each element from a functional response model to its correct meaning. -a

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