BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 58, Problem 5U
When populations are drastically reduced in size, genetic diversity and heterozygosity
a. are likely to increase, enhancing the probability of extinction.
b. are likely to decrease, enhancing the probability of extinction.
c. are usually not factors that influence the probability of extinction.
d. automatically respond in a way that protects populations from future changes.
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Students have asked these similar questions
a black bear accidentally stepped on a ladybug beetle, and the beetle survived. What type of ecological species interaction is this?
a. amensalism
b. commensalism
c. neutral
d. it is not a species interaction, because this incident does not affect the fitness of bears or ladybug populations
e. the answer depends on whether that ladybug's fitness is affected negatively
In populations subjected to high levels of predation
a. individuals should invest little in reproduction so as to maximize their survival.
b. individuals should produce few offspring and invest little in any of them.
c. individuals should invest greatly in reproduction because their chance of surviving to another breeding season is low.
d. individuals should stop reproducing altogether.
Predators that are specialists usually have a population abundance:
a.
That is usually very small.
b. That repeatedly oscillates up and down.
c. That is very constant.
d. That is mainly affected by climatic factors.
e.
That may locally go extinct (so depends on immigration).
Chapter 58 Solutions
BIOLOGY
Ch. 58.1 - Describe the history of extinction through time.Ch. 58.1 - Prob. 2LOCh. 58.2 - Prob. 1LOCh. 58.2 - Prob. 2LOCh. 58.3 - Prob. 1LOCh. 58.3 - Explain how these causes can interact to bring...Ch. 58.4 - Prob. 1LOCh. 58.4 - Describe the potential roles of natural selection...Ch. 58.4 - Prob. 3LOCh. 58.5 - Prob. 1LO
Ch. 58.5 - Prob. 2LOCh. 58.5 - Prob. 3LOCh. 58 - If we assume that population density is a good...Ch. 58 - Prob. 2DACh. 58 - Would the extinction rate increase if an area were...Ch. 58 - Prob. 4DACh. 58 - Why do population density and growth rates differ...Ch. 58 - Why might whale populations fail to recover once...Ch. 58 - Why do small populations lose genetic variation?Ch. 58 - Prob. 1UCh. 58 - The economic value of indirect ecosystem services...Ch. 58 - The amphibian decline is best described as a....Ch. 58 - Prob. 4UCh. 58 - When populations are drastically reduced in size,...Ch. 58 - A captive-breeding program followed by release to...Ch. 58 - Historically, island species have tended to become...Ch. 58 - Ninety-nine percent of all the species that ever...Ch. 58 - To effectively address the biodiversity crisis,...Ch. 58 - The introduction of a nonnative predator to an...Ch. 58 - If 99% of the species that ever existed are now...Ch. 58 - Prob. 2SCh. 58 - Prob. 3SCh. 58 - Prob. 4SCh. 58 - Prob. 5S
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- A species that has an immediate threat to extinction is said to be:a. threatened. c. alien.b. endangered. d. extinct.arrow_forwardWhy does the aquarium trade contribute to the introduction of nonnative species? a. Exotic species can escape or be released into local ecosystems. b. Aquarium owners do not always understand how ecosystems interact. c. Nonnative fish are shipped worldwide for aquariums. d. All of the above Please select the best answer from the choices provided A B C Darrow_forwardIntraspecific competition reduces allelic diversity by Select one: a. relieving predator pressure on the prey population b. allowing K-selected species to have a selective advantage over r-selected species c. creating a competitive advantage to certain alleles d. allowing two different species occupying the same niche to compete for resourcesarrow_forward
- 16. Which is not a cause of extinction?. A. Animals eat too much B. Habitat loss C. Natural disasters D. over-hunting 17. How can you help prevent extinctions? A. By not polluting our environment. B. By protecting sensitive habitats and species. C. By not eating or buying products from endangered animals. D. By allowing other people to hunt for their food. 18. Which of the following was a natural factor that caused extinctions? A. Changes in the oxygen levels C. Over harvesting B. Habitat destruction D. Pollution 19. What do most scientists think caused the mass extinction of dinosaurs and other organisms at the end of the Cretaceous period? A. An object from space struck Earth. B. An ice age covered most of Earth with ice. C. The dinosaurs ate too many other organisms and then starved. D. Volcanic eruptions covered large areas with lava. 20. This.is the extinction of a species one by one, not a sudden loss of many species A. Background extinction B. Biotic potentíal C. Fragmentation…arrow_forwardGene flow occurs a. when individuals within a population interbreed. b. as a result of genetic drift. c. as a result of mutations in one population but not in another. d. when an individual migrates between two otherwise isolated populations of a species.arrow_forwardThe American Bison was hunted to near extinction by early settlers. Which answer is correct about the current population of American Bison? chose the correct answer(s) a.It has experienced a population bottleneck. b.It is more genetically diverse. c.It has experienced the founder effect. d.Both a. and b. e.Both b. and c.arrow_forward
- The island equilibrium model predicts that a small island will be able to support _____ species than a large island because the rate of _____ will be higher due to _____. A. More; extinction; easier dispersal B. More; immigration; easier dispersal C. Fewer; immigration; reduced dispersal D. Fewer; extinction; increased competition E. Fewer; immigration; harder dispersalarrow_forwardEcological dominants are a. the most numerous or make up the most biomass within a community. b. are species that may not be the most numerous within a community, but whose role is so significant that its absence would bring about considerable change. c. species that are introduced into an area where they do not naturally occur. d. the most important species on the planet.arrow_forwardWhen songbird species that nest in forest core areas are exposed to habitat fragmentation and more forest edge, they can become exposed to: A. increased predation of their eggs by raccoons B. increasingly dry micro-climate conditions C. brood or nest parasitism by brown-headed cowbirds D. All of the above are correct E. none of the above are correctarrow_forward
- Which of these is a true statement?a. Habitat loss is the most frequent cause of extinctions today.b. Exotic species are often introduced into ecosystems by accidental transport.c. Climate change may cause many extinctions but also expands the ranges of other species.d. Overexploitation of fisheries could lead to a complete collapse of the fishing industry.e. All of these statements are true.arrow_forwardPredators are more likely to a. increase the gene pool of the prey population b. increase their population size after the prey population increases c. lead to competition exclusion through natural selection d. diversify the alleles of both the prey and predator populationsarrow_forwardA biologist determines the growth rate of a population of 198 frogs in a marsh near Beaverhill Lake, Alberta, to evaluate the quality of the environment. The researcher finds that, in one year, 34 were born, 86 died, 12 migrated into the marsh, and there was no emigration. a. frogs are considered an indicator species for the quality of the environment. Determine whether the growth rate of this population in one year is a cause for concern. if so, what might the concerns be?arrow_forward
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