Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 54.1, Problem 1R
Summary Introduction
To review:
The five populations of humpback whales that interact on their summer feeding grounds, and whether they make up a metapopulation or not.
Introduction:
Migration is a type of dispersal, which takes place due to seasonal changes and variations in the
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A conservationist wants to enhance survival of individual Daphnia populations in the metapopulation along the Scandinavian coast. To be successful, which action would this conservationist most likely carry out in these freshwater rock pools?
a. Connecting vulnerable pools by making dispersal corridors to the ocean
b.Separating the smallest pools from the largest to prevent immigration
c.Removing the shortest-lived Daphnia species from all pools
d.Separating pools so the Daphnia cannot mix with one another
e.Connecting vulnerable pools by making dispersal corridors between them
Ancestors of the beach mouse mayhave exhibited variations in their coat color. Because of the prevalence of visualpredators, the better-camouflaged (lighter) mice in the beach habitat may havesurvived longer and been able to produce more offspring. Over time, a higher andhigher proportion of individuals in the population would have had the adaptation of lighter fur that acted to camouflage the mouse in the beach habitat.
Explain the concept of metapopulations. Discuss the role of source and sink populations in contributing to the metapopulation structure.
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Life: The Science of Biology
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- RobertMacArthur’s study of forest warblers suggested that:a.fewer warbler species can survive in more complex habitats.b.warbler species diversity increases with habitat complexity.c.warbler species diversity decreases with habitat complexity.d.most warblers have rather similar foraging niches.e.none of the choices apply.arrow_forwardIn one of the hypotheses that explain the extinction of the dinosaurs, the rapid climatic change produced an environmental situation with which these species could not cope. How important is the total amount of variation present in the population if the selective pressures suddenly change? Why?arrow_forwardSuppose two species of morning glories are reproductively isolated because in one species the flowers bloom in early April and in the other species they flower in mid-May. This would be an example of _______ isolation, which is a form of _______ isolation. a. habitat; prezygotic b. temporal; prezygotic c. temporal; postzygotic d. behavioral; postzygotic e. habitat; postzygoticarrow_forward
- In what ways would you expect forced migration to have an impact on the phenotypes of animal populations over the next 100 years?arrow_forwardYou are surveying of the turtle species identifies several breeding populations in different habitats across the island. After a very warm summer of 2020, you observe that the hatchlings from low-elevation nests are mostly males, whereas hatchlings from higher elevations have an equal female-to-male sex ratio. As a bit more background, temperature influences the sex ratio in some turtle species, a phenomenon called temperature-sex determination (TSD). With this knowledge, you hypothesize this new turtle species exhibits TSD, and that eggs incubated at low elevations during the warm year experienced a high enough embryonic temperature to skew the sex ratio. To test this, you collect 20 newly laid eggs in early 2021 & take them back to the lab to conduct an experiment to test your hypothesis that this species exhibits TSD. Assume you know the average nest temperature in the wild, and you have access to multiple incubators Design an experiment to test the hypothesis that this turtle…arrow_forwardThe model of metapopulations also postulates that many species occupy their patches only temporarily, that sooner or later they will be eliminated by competition or some other factor. If this is true, would such a patch make a suitable wildlife preserve for that species? Discuss what wildlife managers might have to do with such a preserve.arrow_forward
- imagine that you have a population of monkeys the variety within the species allows for monkeys to be long tailed or tailless; carnivorous or herbivorous; and brown or blonde furred. Describe an example of an environmental change to happen to these monkeys that over many generations?arrow_forwardThe graph below shows changes in the size of an Emperorpenguin population in terms of numbers of breeding pairson the island of Terre Adelie in the Antarctic. Scientistsused these data along with data on the penguins’ shrinking ice habitat to project a general decline in the island’sEmperor penguin population, to the point where theywill be endangered in 2100. Use the graph to answer thequestions on the right. What was the overall percentage decline in thepenguin population from 1975 to 2010?arrow_forwardGray whales ( Eschrichtius robustus) gather each winter near BajaCalifornia to give birth. How might such behavior make it easierfor ecologists to estimate birth and death rates for the species?arrow_forward
- Which of the following best describes the data and explains the effect of the arrival of the brown tree snake on Guam’s native bird species?arrow_forwardEVOLUTION CONNECTION Contrast the selective pressuresoperating in high-density populations (those near the carryingcapacity, K) versus low-density populations.arrow_forwardDescribe the effects of the disappearance of beaver from an ecosystem on the wolf population.arrow_forward
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