ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
3rd Edition
ISBN: 9780135964422
Author: Urry
Publisher: PEARSON
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Chapter 43, Problem 5TYU
Summary Introduction
Introduction:
The extinction vortex can be defined as the major reduction in the
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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.
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.
Ninety-nine percent of all the species that ever existed have gone extinct,
a. serving as evidence that current extinction rates are not higher than normal.
b. but most of these losses have occurred in the last 400 years.
c. which argues that the world just had too many species.
d. None of the choices is correct.
Chapter 43 Solutions
ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
Ch. 43.1 - Prob. 1CCCh. 43.1 - Prob. 2CCCh. 43.1 - WHAT IF? Imagine two populations of a fish...Ch. 43.2 - How does the reduced genetic diversity of small...Ch. 43.2 - Prob. 2CCCh. 43.2 - WHAT IF? In 2005, at least ten grizzly bears in...Ch. 43.3 - Prob. 1CCCh. 43.3 - Prob. 2CCCh. 43.3 - Prob. 3CCCh. 43.4 - How can the addition of excess mineral nutrients...
Ch. 43.4 - MAKE CONNECTIONS There are vast stores of organic...Ch. 43.5 - Prob. 1CCCh. 43.5 - Prob. 2CCCh. 43.6 - Prob. 1CCCh. 43.6 - Prob. 2CCCh. 43.6 - WHAT IF? Suppose a new fishery is discovered, and...Ch. 43 - Prob. 1TYUCh. 43 - Prob. 2TYUCh. 43 - Prob. 3TYUCh. 43 - Prob. 4TYUCh. 43 - Prob. 5TYUCh. 43 - Prob. 6TYUCh. 43 - Prob. 8TYUCh. 43 - FOCUS ON EVOLUTION The fossil record indicates...Ch. 43 - Prob. 10TYUCh. 43 - SYNTHESIZE YOUR KNOWLEDGE Big cats, such as the...
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- Ecological 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_forwardA species that has an immediate threat to extinction is said to be:a. threatened. c. alien.b. endangered. d. extinct.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
- A large tropical island is found near the mainland. Based on the predictions of the MacArthur and Wilson equilibrium model of island biogeography this island will have… a. low immigration rates and low extinction rates b. high immigration rates and high extinction rates c. low immigration rates and high extinction rates d. high immigration rates and low extinction ratesarrow_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_forwardConservation hotspots are best described as a. areas with large numbers of endemic species, in many of which species are disappearing rapidly. b. areas where people are particularly active supporters of biological diversity. c. islands that are experiencing high rates of extinction. d. areas where native species are being replaced with introduced species.arrow_forward
- . Which of the following represents the permanent loss of a species?a. natural selection c. extinctionb. greenhouse effect d. climate changearrow_forwardWhich of the following strategies would most rapidly increasethe genetic diversity of a population in an extinction vortex?(A) Establish a reserve that protects the population’s habitat.(B) Introduce new individuals transported from other populations of the same species.(C) Sterilize the least fit individuals in the population.(D) Control populations of the endangered population’spredators and competitors.arrow_forwardJosephConnell’s “intermediate disturbance hypothesis” proposes that:a.species diversity is highest at intermediate frequencies of disturbance.b.species diversity is lowest at intermediate frequencies of disturbance.c.population growth rates are highest at intermediate frequencies ofdisturbance.d.competitive exclusion is fastest at intermediate levels of disturbance.e.none of the choices apply.arrow_forward
- Mowingexperiments in a Kansas prairie established that, for small mammals:a.moving individuals travel farther in more fragmented landscapes.b.moving individuals travel farther in less fragmented landscapes.c.more individuals move in more fragmented landscapes.d.fragmentation affects movement distance but not the likelihood ofmovement.e.fragmentation affects the likelihood of movement, but not movementdistance.arrow_forwardHabitat fragmentation results from human activities that change large blocks of landscape, leading to many negative effects on species and ecosystems. Which of the following is not one of the possible consequences of fragmentation? A. reduction of available habitat O B. increasing degradation of habitat patches C. increasing wind speeds and temperatures at patch edges D. spatial isolation of patches E. increase in top predators present in patchesarrow_forwardWhich of the following statements best represents the productivityhypothesis regarding species richness?a. The larger the area, the greater the number of species that will befound there.b. Temperate regions have a lower species richness due to the lack oftime available for migration after the last Ice Age.c. The number of species in a particular community is directly relatedto the amount of available energy.d. As invertebrate productivity increases, species richness will increase.e. Species richness is not related to primary productivity.arrow_forward
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