1 SEM CARDLESS ACC W/RAVEN TEXT
12th Edition
ISBN: 9781265321062
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 58, Problem 3S
Summary Introduction
To discuss:
The difference between the global decline and the normal species extinction.
Introduction:
The extinction of the species might occur because of many reasons such as the overexploitation, habitat loss, ecosystem interactions, catastrophic disturbances, pollution, and loss of
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New Zealand snapper populations were found to be under the influence of genetic drift, suggesting overfishing was still an issue for them, despite the New Zealand fisheries estimating their total population size to be over 3 million. Which of the following is the best explanation for this observation?
A) Pelagic fish, like the New Zealand snapper, often only have a few reproductive individuals, therefore their effective population size is actually much smaller than the total population size.
B) Pelagic fish, like the New Zealand snapper, often have an equal sex ratio which affects the number of breeding individuals.
C) Pelagic fish, like the New Zealand snapper, often have disassortative mating which affects the number of breeding individuals.
D) Pelagic fish, like the New Zealand snapper, often have assortative mating which affects the number of breeding individuals.
Define and distinguish among native, nonnative, indicator, and keystone species and give an example of each. What is an invasive species?List six factors that threaten many species of frogsand other amphibians with extinction. Describe therole of the American alligator as a keystone species.Explain why ecologists say we should protect sharks.
Allan Pounds and Kevin Anchukaitis both think only one factor - either climate change or an El Nino
event - killed the golden toad. However, might they both be right? Could it be that the dry conditions
created by the El Nino event were worsened by underlying climate change effects, so that El Nino and
climate change together caused the extinction of the golden toad in Monteverde?
Yes, the El Nino event in combination with climate change could have led to the extinction of the golden toad.
Multiple factors can influence species' extinction.
O No, only one factor - either climate change or El Nino - acting alone killed the golden toad. Species are only ever
affected by one environmental factor, never by multiple factors.
Chapter 58 Solutions
1 SEM CARDLESS ACC W/RAVEN TEXT
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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- The number of extinctions of birds and mammals has gone up as human populations have increased. True or False ?arrow_forwardWhat is the relationship between extinction, its impact on biodiversity, and ecosystems? When a species becomes extinct, the vacancy of that species allows another species to invade and transform the ecosystem so there is no longer biodiversity, which allows the ecosystem to flourish. The extinction of plants and animals leaves a vacancy in the biodiversity of the ecosystem, which can cause the ecosystem to collapse. The extinct plants and animals can come back as a different species, creating more biodiversity within the ecosystem. The extinction of plants and animals does not have an impact on the biodiversity of an ecosystem.arrow_forwardIf 99% of the species that ever existed are now extinct, why is there such concern over the extinction rates over the last several centuries?arrow_forward
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