Question 1

Describe taxonomic homogenization and give an example. How does it affect biodiversity and extinction of species?

Accepted Answer

Taxonomic homogenization occurs when Ear...

Question 2

The major factor leading to the extinction of the passenger pigeon was

Accepted Answer

A)   habitat loss.
B)   climate change.
C)   overharvesting.
D)   the introduction of an invasive species.E) None of the above
F) A) and C)

Question 3

Refer to the table.

- As of 2019, out of all documented endangered species, what percentage of insects evaluated were considered threatened?

Accepted Answer

A)   About 5.7%
B)   About 8.2%
C)   About 29.9%
D)   About 47.0%E) All of the above
F) A) and D)

Question 4

The cheetah has helped garner public support for various conservation projects due in part to its charismatic nature. For this reason, the cheetah could best be classified as what type of species?

Accepted Answer

A)   Surrogate
B)   Flagship
C)   Umbrella
D)   FocalE) All of the above
F) C) and D)

Question 5

Which of these is an example of an anthropogenic Allee effect?

Accepted Answer

A)   As rhinos become rarer, there is an increased effort by poachers to obtain their increasingly valuable horns.
B)   The extinction of island endemics is often coupled with the introduction of cosmopolitan species.
C)   As the population of a species of butterflies drops, there is more inbreeding in the species.
D)   The introduction of an invasive grass species alters the ecological relationships of other species.E) A) and D)
F) B) and C)

Question 6

For which purpose is molecular genetic analysis not useful?

Accepted Answer

A)   Determining whether food items come from species that have been hunted illegally
B)   Estimating the genetic diversity in a population
C)   Estimating the extent of gene flow between populations
D)   Estimating whether the growth rate of a population is high enough to allow it to persistE) B) and D)
F) A) and B)

Question 7

Tropical cloud forests are extremely biodiverse, but are strongly affected by climate change, leading to a loss of many unique species. Conservationists want to preserve a species of frog unique to the cloud forests of Costa Rica. How might demographic models help in this effort?

Accepted Answer

Demographic models can answer questions ...

Question 8

An insect has habitat requirements that overlap substantially with those of other endangered species. Because this insect is well known for its beautiful coloration, efforts to protect it have garnered much support. It is thus acting as which kind of species?

Accepted Answer

A)   Keystone
B)   Invasive
C)   Flagship
D)   FocalE) C) and D)
F) All of the above

Question 9

Population viability analysis (PVA)  is useful for all of these reasons except that biologists can use it to

Accepted Answer

A)   calculate the likelihood that a particular species will persist for a certain amount of time under various conditions.
B)   determine likely future habitat conditions with great accuracy.
C)   evaluate different options for protecting threatened species.
D)   identify particularly vulnerable age or stage classes.E) None of the above
F) A) and C)

Question 10

Refer to the figure.
 The figure shows the current level of threat faced by each biome from a variety of sources. The arrows show the direction whether the threat is decreasing, continuing, increasing, or rapidly increasing. 
-Which two threats, regardless of their past effect (from low to very high)  are currently showing a rapidly increasing risk in all biomes?

Accepted Answer

A)   Habitat loss and climate change
B)   Climate change and pollution (nitrogen/phosphorus) 
C)   Climate change and invasive species
D)   Overexploitation and pollution (nitrogen/phosphorus) E) B) and C)
F) A) and B)

Question 11

A conservation biologist is studying the variation that occurs in the species composition of ponds in a region. This scientist is studying which level of biodiversity?

Accepted Answer

A)   Species diversity
B)   Community diversity
C)   Genetic diversity within species
D)   Both genetic and species diversityE) None of the above
F) All of the above

Question 12

The use of species‒area relationships to predict extinction rates assumes that most extinction is due to

Accepted Answer

A)   invasive species.
B)   overexploitation.
C)   habitat loss.
D)   global climate change.E) None of the above
F) A) and B)

Question 13

Biologists can make population viability analysis (PVA)  models more effective by

Accepted Answer

A)   checking the validity of the models against field observations.
B)   choosing only small populations to model.
C)   using the models to predict the time to extinction of a given species only.
D)   combining data from different species in a model.E) B) and D)
F) B) and C)

Question 14

Which factor is not part of the growing taxonomic homogenization of Earth's biota?

Accepted Answer

A)   Increases in the number of native specialist species
B)   Decreases in the distribution of native specialist species
C)   Increases in the number of native generalist species
D)   Rapid spread of introduced speciesE) B) and C)
F) All of the above

Question 15

Asian long-horned beetles, introduced into North America, lay their eggs in almost any available deciduous tree. The larvae eat the soft bark and sap, making it difficult for nutrients to reach other parts of the tree, then burrow into the middle of it, leaving large tunnels and weakening the tree. Adult beetles emerge from the tree by burrowing through the bark, leaving large holes. Many trees do not survive these infestations. Asian long-horned beetles thus impact native species by

Accepted Answer

A)   out-competing them.
B)   preying on and killing them.
C)   destroying their habitat.
D)   specifically attacking rare species.E) None of the above
F) A) and B)

Question 16

Refer to the figure.
 The figure shows the tons of cod caught off Newfoundland, Canada over 150 years. The spike in catch during the 1960s and 1970s, followed by the collapse of the fishery in the 1990s could be considered evidence of

Accepted Answer

A)   overexploitation of an economically important species.
B)   the devastating effect of bycatch on an important fishery.
C)   the result of severe ocean pollution beginning in the 1960s.
D)   the ability of a species to recover from a collapse.E) A) and C)
F) A) and D)

Question 17

The Nile perch in Africa's Lake Victoria is an example of a(n)

Accepted Answer

A)   species that has become threatened due to habitat loss.
B)   invasive predator that is adversely affecting native species.
C)   flagship species.
D)   umbrella species.E) None of the above
F) All of the above

Question 18

Refer to the figure.
 This figure shows results of Steadman's study of bird extinctions in the Pacific Islands, specifically differing rates of extinctions among different guilds of birds. Based on this information, the extinction of which guild(s)  of birds probably had the greatest effect on the island's plant communities?

Accepted Answer

A)   Frugivores
B)   Nectarivores
C)   Omnivores
D)   Insectivores and predatorsE) C) and D)
F) All of the above

Question 19

Refer to the figure.
 The top figure shows concentrations of PCBs in killer whales and harbor seals at several locations. The bottom figure shows concentrations of PBDEs in both groups of mammals. These persistent organic chemicals build up in animal tissues and disrupt their endocrine systems, including reproductive systems. What is the most reasonable conclusion that can be drawn regarding the effect of these chemicals based on the data in these figures?

Accepted Answer

A)   The levels of both types of chemicals have been high, but are now decreasing.
B)   The levels of both types of chemicals vary by population, but some are dangerously high.
C)   The levels of both types of chemicals are often high, but never dangerously so.
D)   In most cases, harbor seals appear to concentrate and remove the chemicals, where killer whales do not.E) A) and B)
F) A) and C)

Question 20

Refer to the figure.
 The green in the figure represents forest cover in western Ecuador at three different times. The decreasing amount of forest cover is most representative of

Accepted Answer

A)   declining biodiversity in the region.
B)   the conservation work of Alwyn Gentry.
C)   the impact of climate change on forest habitats.
D)   the difficulty of identifying endangered species.E) None of the above
F) A) and B)

Exam 23: Conservation Biology

Refer to the figure. The green in the figure represents forest cover in western Ecuador at three different times. The decreasing amount of forest cover is most representative of

Correct Answer
verified

Correct Answer
verified

Biologists can make population viability analysis (PVA) models more effective by

Correct Answer
verified

Tropical cloud forests are extremely biodiverse, but are strongly affected by climate change, leading to a loss of many unique species. Conservationists want to preserve a species of frog unique to the cloud forests of Costa Rica. How might demographic models help in this effort?

Correct Answer
verified
Demographic models can answer questions ...
View Answer

Describe taxonomic homogenization and give an example. How does it affect biodiversity and extinction of species?

Correct Answer
verified
Taxonomic homogenization occurs when Ear...
View Answer

An insect has habitat requirements that overlap substantially with those of other endangered species. Because this insect is well known for its beautiful coloration, efforts to protect it have garnered much support. It is thus acting as which kind of species?

Correct Answer
verified

Refer to the table. - As of 2019, out of all documented endangered species, what percentage of insects evaluated were considered threatened?

Correct Answer
verified

For which purpose is molecular genetic analysis not useful?

Correct Answer
verified

The cheetah has helped garner public support for various conservation projects due in part to its charismatic nature. For this reason, the cheetah could best be classified as what type of species?

Correct Answer
verified

The major factor leading to the extinction of the passenger pigeon was

Correct Answer
verified

The use of species‒area relationships to predict extinction rates assumes that most extinction is due to

Correct Answer
verified

Correct Answer
verified

Population viability analysis (PVA) is useful for all of these reasons except that biologists can use it to

Correct Answer
verified

Which of these is an example of an anthropogenic Allee effect?

Correct Answer
verified

Correct Answer
verified

Refer to the figure. The figure shows the tons of cod caught off Newfoundland, Canada over 150 years. The spike in catch during the 1960s and 1970s, followed by the collapse of the fishery in the 1990s could be considered evidence of

Correct Answer
verified

Correct Answer
verified

Which factor is not part of the growing taxonomic homogenization of Earth's biota?

Correct Answer
verified

A conservation biologist is studying the variation that occurs in the species composition of ponds in a region. This scientist is studying which level of biodiversity?

Correct Answer
verified

The Nile perch in Africa's Lake Victoria is an example of a(n)

Correct Answer
verified

Exam 23: Conservation Biology

Refer to the figure. The green in the figure represents forest cover in western Ecuador at three different times. The decreasing amount of forest cover is most representative of

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Biologists can make population viability analysis (PVA) models more effective by

Correct AnswerverifiedShow Answer

Tropical cloud forests are extremely biodiverse, but are strongly affected by climate change, leading to a loss of many unique species. Conservationists want to preserve a species of frog unique to the cloud forests of Costa Rica. How might demographic models help in this effort?

Correct AnswerverifiedDemographic models can answer questions ...View AnswerShow Answer

Describe taxonomic homogenization and give an example. How does it affect biodiversity and extinction of species?

Correct AnswerverifiedTaxonomic homogenization occurs when Ear...View AnswerShow Answer

An insect has habitat requirements that overlap substantially with those of other endangered species. Because this insect is well known for its beautiful coloration, efforts to protect it have garnered much support. It is thus acting as which kind of species?

Correct AnswerverifiedShow Answer

Refer to the table. - As of 2019, out of all documented endangered species, what percentage of insects evaluated were considered threatened?

Correct AnswerverifiedShow Answer

For which purpose is molecular genetic analysis not useful?

Correct AnswerverifiedShow Answer

The cheetah has helped garner public support for various conservation projects due in part to its charismatic nature. For this reason, the cheetah could best be classified as what type of species?

Correct AnswerverifiedShow Answer

The major factor leading to the extinction of the passenger pigeon was

Correct AnswerverifiedShow Answer

The use of species‒area relationships to predict extinction rates assumes that most extinction is due to

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Population viability analysis (PVA) is useful for all of these reasons except that biologists can use it to

Correct AnswerverifiedShow Answer

Which of these is an example of an anthropogenic Allee effect?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Refer to the figure. The figure shows the tons of cod caught off Newfoundland, Canada over 150 years. The spike in catch during the 1960s and 1970s, followed by the collapse of the fishery in the 1990s could be considered evidence of

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which factor is not part of the growing taxonomic homogenization of Earth's biota?

Correct AnswerverifiedShow Answer

A conservation biologist is studying the variation that occurs in the species composition of ponds in a region. This scientist is studying which level of biodiversity?

Correct AnswerverifiedShow Answer

The Nile perch in Africa's Lake Victoria is an example of a(n)

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Demographic models can answer questions ...
View Answer

Correct Answer
verified
Taxonomic homogenization occurs when Ear...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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