Question 1

When the habitat is complex, few species can survive.

Accepted Answer

A) True 
 B)False

Question 2

Explain why species diversity is low when disturbance is frequent in the Intermediate Disturbance hypothesis.

Accepted Answer

Not all species are able to su...

Question 3

Which of the following are not regions with high species diversity?

Accepted Answer

A)   ecotones
B)   upland tropical forest
C)   the deep ocean floor
D)   peninsulas
E)   none of the aboveF) A) and B)
G) C) and D)

Question 4

Explain why the immigration rate declines as a function of the number of species on an island.

Accepted Answer

As each species colonizes, the...

Question 5

Habitats with moderate levels of disturbance have higher species diversity.

Accepted Answer

A) True 
 B)False

Question 6

In the allopatric model of speciation,

Accepted Answer

A)   hybrid matings are selected against.
B)   species arise in the same region.
C)   gene flow increases as speciation proceeds.
D)   the populations must experience a single environment.
E)   none of the aboveF) C) and D)
G) A) and B)

Question 7

The global extinction rate began to increase

Accepted Answer

A)   before humans migrated from Africa.
B)   coincided with the development of agriculture.
C)   began when humans became hunter-gatherers.
D)   when the Pleistocene glaciers advanced.
E)   none of the aboveF) A) and E)
G) B) and E)

Question 8

Which of the following was not a cause of mass extinctions in the fossil record?

Accepted Answer

A)   tectonic movement
B)   asteroids
C)   changes in sea level
D)   changes in solar output
E)   none of the aboveF) B) and D)
G) C) and E)

Question 9

Biodiversity is the sum of alpha, beta, and gamma diversity.

Accepted Answer

A) True 
 B)False  False

Question 10

In grasslands,

Accepted Answer

A)   species diversity increased during drought.
B)   species-poor communities were less affected by drought.
C)   species-rich communities were less affected by drought.
D)   evenness is correlated with drought resistance.
E)   none of the aboveF) All of the above
G) D) and E)

Question 11

Ecological stability is the result of __________, the tendency of a system not to change when disturbed and __________, the ability of the system to recover.

Accepted Answer

resistance...

Question 12

The Shannon-Weiner index of diversity measures gamma diversity.

Accepted Answer

A) True 
 B)False

Question 13

The Yasuni forest in the Amazon is characterized by high but uniform species diversity.

Accepted Answer

A) True 
 B)False  True

Question 14

"Uncertainty" in the Shannon-Weiner Index

Accepted Answer

A)   is a measure of species richness.
B)   is a measure of species abundance.
C)   is a measure of species richness and abundance.
D)   refers to the variation inherent in sampling.
E)   none of the aboveF) A) and E)
G) A) and D)

Question 15

In the species area equation S = cAz ,

Accepted Answer

A)   c is the competition coefficient
B)   A is the area of the island
C)   z is the tangent to the curve
D)   the value of z is unknown for most islands
E)   none of the aboveF) A) and D)
G) A) and E)

Question 16

Pre-mating reproductive barriers

Accepted Answer

A)   generally arise before post-mating barriers.
B)   are the result of local adaptation.
C)   arise when hybrids are selected against.
D)   facilitate gene flow.
E)   none of the aboveF) A) and C)
G) A) and B)

Question 17

In Simberloff's experimental test of the theory of island biogeography, the same species were found on each island as had been present before the treatment.

Accepted Answer

A) True 
 B)False

Question 18

In the Shannon-Weiner index (H = -∑ pi ln pi) the variable pi represents the number of individuals in species i.

Accepted Answer

A) True 
 B)False

Question 19

Species arise when gene flow between populations is inhibited.

Accepted Answer

A) True 
 B)False  True

Question 20

The equilibrium number of species on an island

Accepted Answer

A)   occurs when the extinction rate reaches zero.
B)   is independent of island size.
C)   occurs when immigration equals extinction.
D)   occurs when no more species are able to immigrate.
E)   none of the aboveF) C) and E)
G) D) and E)

Exam 16: Species Diversity

When the habitat is complex, few species can survive.

Correct AnswerverifiedShow Answer

Explain why species diversity is low when disturbance is frequent in the Intermediate Disturbance hypothesis.

Correct AnswerverifiedNot all species are able to su...View AnswerShow Answer

Which of the following are not regions with high species diversity?

Correct AnswerverifiedShow Answer

Explain why the immigration rate declines as a function of the number of species on an island.

Correct AnswerverifiedAs each species colonizes, the...View AnswerShow Answer

Habitats with moderate levels of disturbance have higher species diversity.

Correct AnswerverifiedShow Answer

In the allopatric model of speciation,

Correct AnswerverifiedShow Answer

The global extinction rate began to increase

Correct AnswerverifiedShow Answer

Which of the following was not a cause of mass extinctions in the fossil record?

Correct AnswerverifiedShow Answer

Biodiversity is the sum of alpha, beta, and gamma diversity.

Correct AnswerverifiedFalse

In grasslands,

Correct AnswerverifiedShow Answer

Ecological stability is the result of __________, the tendency of a system not to change when disturbed and __________, the ability of the system to recover.

Correct Answerverifiedresistance...View AnswerShow Answer

The Shannon-Weiner index of diversity measures gamma diversity.

Correct AnswerverifiedShow Answer

The Yasuni forest in the Amazon is characterized by high but uniform species diversity.

Correct AnswerverifiedTrue

"Uncertainty" in the Shannon-Weiner Index

Correct AnswerverifiedShow Answer

In the species area equation S = cAz ,

Correct AnswerverifiedShow Answer

Pre-mating reproductive barriers

Correct AnswerverifiedShow Answer

In Simberloff's experimental test of the theory of island biogeography, the same species were found on each island as had been present before the treatment.

Correct AnswerverifiedShow Answer

In the Shannon-Weiner index (H = -∑ pi ln pi) the variable pi represents the number of individuals in species i.

Correct AnswerverifiedShow Answer

Species arise when gene flow between populations is inhibited.

Correct AnswerverifiedTrue

The equilibrium number of species on an island

Correct AnswerverifiedShow Answer

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Not all species are able to su...
View Answer

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As each species colonizes, the...
View Answer

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False

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Ecological stability is the result of , the tendency of a system not to change when disturbed and , the ability of the system to recover.

Correct Answer
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resistance...
View Answer

Correct Answer
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True

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In the species area equation S = cA^z,

Correct Answer
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In the Shannon-Weiner index (H = -∑ p_i ln p_i) the variable p_i represents the number of individuals in species i.

Correct Answer
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True

Correct Answer
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