Question 1

A small group of mice are released on an island without mice but with abundant food for mice and no predators.After the population size stabilizes for several years,a hurricane drastically reduces it,we can now say that

Accepted Answer

A)  the biotic potential of the population has been reduced.
B)  its new population size is a result of density-dependent regulation.
C)  its new population size is a result of density-independent regulation.
D)  it can now act as a sink metapopulation.
E)  it can now act as a source metapopulation.

Question 2

In the logistic growth model,as the number of individuals in the population (N) approaches the carrying capacity (K) ,the rate of growth (dN/dt)

Accepted Answer

A)  increases rapidly until N far surpasses K.
B)  increases rapidly until N reaches K and then stops.
C)  increases at the same rate it has been,continuing on until N is beyond K for some distance before regulating.
D)  approaches zero as N approaches K.
E)  stops well before N reaches K and stabilizes.

Question 3

During the late 1800s,cattle egrets arrived in South America from Africa and began to colonize.Their range has expanded dramatically over the years.They were able to do this because

Accepted Answer

A)  the habitats that they left in Africa were not suitable for any further colonization;thus,they were forced to immigrate.
B)  the habitats that they encountered in South America were suitable to them and unoccupied.
C)  there were abundant cattle for the birds to gather around in South America;furthermore,various animals that the egrets had lived around in Africa had become quite scarce because of over hunting and poaching,causing the birds to extend their range.
D)  the food resources in South America were far superior to those in Africa,allowing the egrets more opportunity to grow and reproduce and ultimately expand their range.

Question 4

Effects that are dependent on the size of the population and regulate the growth of populations are called ___________ effects.

Accepted Answer

A)  K-related
B)  density-independent
C)  environmental resistance
D)  density-dependent
E)  demographic

Question 5

Spacing within a population for a species that is strongly territorial would be expected to be

Accepted Answer

A)  uniform.
B)  clumped.
C)  random.
D)  uniform or clumped depending if it is a source or sink metapopulation.
E)  uniform or clumped depending on the life history strategy of the species.

Question 6

Organisms that produce offspring several times over many seasons exhibit a life history adaptation called

Accepted Answer

A)  semelparity.
B)  iteroparity.
C)  biparity.
D)  polyparity.
E)  alloparity.

Question 7

Which of the following factors is not one that increases the likelihood of population extinction?

Accepted Answer

A)  Small population size is a factor contributing to a population's extinction.
B)  Isolation of a population from sources of immigrants is a factor contributing to a population's extinction.
C)  Isolation of a population from sinks of immigrants is a factor contributing to a population's extinction.
D)  Low resource availability is a factor contributing to a population's extinction.
E)  Lack of genetic diversity is a factor contributing to a population's extinction.

Question 8

Parental care of the young is usually associated with species with a Type ___ survivorship curve.

Accepted Answer

A)  I
B)  II
C)  III
D)  I or II (depending on the sex ratio) 
E)  I or III (depending on whether the reproductive strategy if iteroparous or semelparous)

Question 9

What point on the graph (marked by A,B,C,D,or E) shows the result of a density independent change in the size of the population?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  E

Question 10

Which of the following statements is true about the graph?

Accepted Answer

A)  Oysters live longer than HydrA.
B)  Hydra and humans have parallel life spans.
C)  Humans and oysters have similar life spans.
D)  Humans have low mortality rates late in life.
E)  Oysters have high mortality rates late in lifE.

Question 11

The rate at which a population of a given species will increase when no limits are placed on its rate of growth is called its __________.

Accepted Answer

A)  maximum growth
B)  carrying capacity
C)  biotic potential
D)  optimal growth C

Question 12

The biotic potential representing growth without limits at its maximal rate is given the symbol

Accepted Answer

A)  r.
B)  N.
C)  K.
D)  dN/dt.
E)  N/K.

Question 13

Clumped or patched populations that undergo local periodic extinction and recolonization are called

Accepted Answer

A)  randomly spaced populations.
B)  uniformly spaced populations.
C)  metapopulations.
D)  over sized populations.
E)  endangered populations.

Question 14

In the sigmoid growth curve,the carrying capacity of the environment is

Accepted Answer

A)  r.
B)  N.
C)  K.
D)  dN/dt.
E)  N/K.

Question 15

Population studies include all of the following features except

Accepted Answer

A)  size.
B)  biodiversity.
C)  density.
D)  dispersion.
E)  demography.

Question 16

The change that begins at point C could be caused by

Accepted Answer

A)  increased predation by wolves.
B)  a wet year with increased vegetative growth.
C)  increased competition from moose herds.
D)  a dry year with decreased vegetative growth.
E)  lower than normal birth rates.

Question 17

What is the most reasonable conclusion that can be made from data graphed in the figure.

Accepted Answer

A)  After high mortality early in life,survivorship becomes constant for the rest of life.
B)  After high mortality late in life,survivorship becomes constant for the rest of life.
C)  After high mortality early in life,survivorship increases at a constant rate for the rest of life.
D)  After high mortality late in life,survivorship increases at a constant rate for the rest of life.
E)  After high mortality early in life,survivorship decreases at a constant rate for the rest of lifE.

Question 18

The r-selected populations are characterized by all of the following except

Accepted Answer

A)  early age of first reproduction.
B)  large brood size/numerous offspring.
C)  little or no parental care.
D)  short generation time.
E)  Type I survivorship curves. E

Question 19

Population pyramids are primarily used to show

Accepted Answer

A)  death rates.
B)  birth rates.
C)  competition.
D)  sex and age composition of a population.
E)  the carrying capacity. D

Question 20

In the logistic growth model,as the number of individuals in the population (N) approaches the carrying capacity (K) ,the intrinsic rate of growth (r)

Accepted Answer

A)  will be affected by an increased birth rate.
B)  will be affected by a decreased death rate from predation.
C)  will be affected by increased competition with other species.
D)  will be affected by increased competition within the species.
E)  will not changE.

Exam 56: Population Ecology

A small group of mice are released on an island without mice but with abundant food for mice and no predators.After the population size stabilizes for several years,a hurricane drastically reduces it,we can now say that

Correct AnswerverifiedShow Answer

In the logistic growth model,as the number of individuals in the population (N) approaches the carrying capacity (K) ,the rate of growth (dN/dt)

Correct AnswerverifiedShow Answer

During the late 1800s,cattle egrets arrived in South America from Africa and began to colonize.Their range has expanded dramatically over the years.They were able to do this because

Correct AnswerverifiedShow Answer

Effects that are dependent on the size of the population and regulate the growth of populations are called ___________ effects.

Correct AnswerverifiedShow Answer

Spacing within a population for a species that is strongly territorial would be expected to be

Correct AnswerverifiedShow Answer

Organisms that produce offspring several times over many seasons exhibit a life history adaptation called

Correct AnswerverifiedShow Answer

Which of the following factors is not one that increases the likelihood of population extinction?

Correct AnswerverifiedShow Answer

Parental care of the young is usually associated with species with a Type ___ survivorship curve.

Correct AnswerverifiedShow Answer

What point on the graph (marked by A,B,C,D,or E) shows the result of a density independent change in the size of the population?

Correct AnswerverifiedShow Answer

Which of the following statements is true about the graph?

Correct AnswerverifiedShow Answer

The rate at which a population of a given species will increase when no limits are placed on its rate of growth is called its __________.

Correct AnswerverifiedC

The biotic potential representing growth without limits at its maximal rate is given the symbol

Correct AnswerverifiedShow Answer

Clumped or patched populations that undergo local periodic extinction and recolonization are called

Correct AnswerverifiedShow Answer

In the sigmoid growth curve,the carrying capacity of the environment is

Correct AnswerverifiedShow Answer

Population studies include all of the following features except

Correct AnswerverifiedShow Answer

The change that begins at point C could be caused by

Correct AnswerverifiedShow Answer

What is the most reasonable conclusion that can be made from data graphed in the figure.

Correct AnswerverifiedShow Answer

The r-selected populations are characterized by all of the following except

Correct AnswerverifiedE

Population pyramids are primarily used to show

Correct AnswerverifiedD

In the logistic growth model,as the number of individuals in the population (N) approaches the carrying capacity (K) ,the intrinsic rate of growth (r)

Correct AnswerverifiedShow Answer

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C

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E

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D

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