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Return to An Introduction to Conservation Biology 2e Student Resources
Chapter 6 Chapter Quiz
Extinction Risk
Quiz Content
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not completed
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The vaquita is a tiny porpoise that lives only in the Gulf of California, near Mexico. In 2017, there were 30 vaquitas left in the world. In 2018, there were 12. Based on this information, it would be most correct to say that the vaquita is
extinct.
correct
incorrect
extinct in the wild.
correct
incorrect
locally extinct.
correct
incorrect
functionally extinct.
correct
incorrect
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A medium-sized flightless bird has very low population numbers. This species is most likely to go extinct if it lives
on an island.
correct
incorrect
on a mainland near a coast.
correct
incorrect
in a tropical rain forest.
correct
incorrect
in an area away from humans.
correct
incorrect
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Based on their
C
and
Z
values from the species-area relationship formula (
S
=
CA
Z
), which area described below is likely largest and has the greatest number of species?
Z= 0.15, C = 1.0
correct
incorrect
Z
= 0.15,
C
= 0.2
correct
incorrect
Z
= 0.35,
C
= 1.0
correct
incorrect
Z
= 0.35,
C
= 0.2
correct
incorrect
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Two islands, one large (A) and one small (B), are located approximately 20 miles from a mainland. Two other islands, one large (C) and one small (D), are located approximately 100 miles from the nearest mainland. According to the island biogeography model, the equilibrium number of species is likely to be greatest on which island?
Island A
correct
incorrect
Island B
correct
incorrect
Island C
correct
incorrect
Island D
correct
incorrect
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The Amur leopard is critically endangered; according to the latest population estimate, 84 individuals still exist in the wild. It lives only in temperate forests in the far eastern part of Russia and is threatened by poachers because of its beautiful fur. The Amur leopard risks extinction because of all these factors
except
narrow geographic range.
correct
incorrect
small population size.
correct
incorrect
island habitat.
correct
incorrect
hunting or harvesting by people.
correct
incorrect
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The most important fishery for the Atlantic bluefin tuna is in the Mediterranean Sea. The Atlantic bluefin is highly sought after and brings very high prices because it is used to make sushi. It is subject to overfishing and illegal fishing. Pacific bluefin tuna is found mostly in the northern Pacific Ocean but also migrates to the southern Pacific. It is also overfished and has a very low density of spawning stock. Fishery managers are currently working to sustain Pacific bluefin populations by limiting the number of fishes taken. Based on this information, which tuna species is likely at greatest risk for extinction?
Atlantic bluefin, because it lives in the small Mediterranean Sea rather than in a large ocean
correct
incorrect
Atlantic bluefin, because it is subject to overfishing and illegal fishing
correct
incorrect
Pacific bluefin, because its ocean habitat makes it harder to fish illegally
correct
incorrect
Pacific bluefin, because its populations are so low it must be managed
correct
incorrect
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not completed
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When new individuals migrate into a population, the population has a greater chance of survival because
migration is the major method for increasing the size of most populations.
correct
incorrect
migration will help protect the existing population from environmental disasters.
correct
incorrect
the new arrivals add genetic diversity, which improves the population’s adaptability.
correct
incorrect
the new arrivals increase genetic drift, which increases heterozygosity in the population.
correct
incorrect
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not completed
.
A rare lizard species on an island survives by inbreeding. The same species exists in a single small population on the mainland, where it outbreeds with a very similar species. Which population is most likely to survive?
The inbreeding population, because the surviving alleles are the most fit
correct
incorrect
The inbreeding population, because the offspring will have lower mortality rates
correct
incorrect
The outbreeding population, because adding new alleles will increase mating success
correct
incorrect
The outbreeding population, because outbreeding may result in hybrid vigor
correct
incorrect
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not completed
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A bird is a member of a rare species, and its population in a certain area is decreasing. Compared to a bird species with a high population, this species would be most affected by
environmental stochasticity, which affects rare species selectively.
correct
incorrect
environmental stochasticity, which causes more catastrophic changes.
correct
incorrect
demographic stochasticity, which causes more unpredictable changes.
correct
incorrect
demographic stochasticity, which affects large and small populations equally.
correct
incorrect
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not completed
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Refer to the graph.
Based on the graph, as the effective population size increases, the population shows
more inbreeding in all populations.
correct
incorrect
less inbreeding in all populations.
correct
incorrect
more inbreeding in most endangered populations.
correct
incorrect
less inbreeding in most endangered populations.
correct
incorrect
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