BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 56, Problem 3A
At Cedar Creek Natural History Area, experimental plots showed reduced numbers of invaders as species diversity of plots increased
a. suggesting that low species diversity increases stability of ecosystems.
b. suggesting that ecosystem stability is a function of primary productivity only.
c. consistent with the theory that intermediate disturbance results in the highest stability.
d. None of the choices is correct.
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Which 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.
Disturbancescan alter a community’s stable environmental conditions, also called its:a.frequency.b.intensity.c.heterogeneity.d.equilibrium.e.niche space.
By a currently favored hypothesis, species richness of a community is greatest when physical disturbances are of_____ intensity and frequency. a. low c. high b. intermediate d. variable
Chapter 56 Solutions
BIOLOGY
Ch. 56.1 - Prob. 1LOCh. 56.1 - Prob. 2LOCh. 56.1 - Prob. 3LOCh. 56.2 - Describe the different trophic levels.Ch. 56.2 - Distinguish between energy and heat.Ch. 56.2 - Explain how energy moves through trophic levels.Ch. 56.3 - Explain the meaning of trophic cascade.Ch. 56.3 - Prob. 2LOCh. 56.4 - Define ecosystem stability.Ch. 56.4 - Prob. 2LO
Ch. 56.4 - Prob. 3LOCh. 56.5 - Prob. 1LOCh. 56.5 - Prob. 2LOCh. 56 - Prob. 1DACh. 56 - Prob. 2DACh. 56 - Prob. 3DACh. 56 - Prob. 4DACh. 56 - Prob. 1IQCh. 56 - Prob. 2IQCh. 56 - Prob. 3IQCh. 56 - Prob. 4IQCh. 56 - Prob. 5IQCh. 56 - Prob. 6IQCh. 56 - Prob. 7IQCh. 56 - Which of the statements about groundwater is NOT...Ch. 56 - Photosynthetic organisms a. fix carbon dioxide. b....Ch. 56 - Prob. 3UCh. 56 - Nitrogen is often a limiting nutrient in many...Ch. 56 - Prob. 5UCh. 56 - Prob. 6UCh. 56 - Inverted ecological pyramids of real systems...Ch. 56 - Prob. 8UCh. 56 - Prob. 9UCh. 56 - The equilibrium model of island biogeography...Ch. 56 - Based on results from studies at Hubbard Brook...Ch. 56 - According to the trophic cascade hypothesis, the...Ch. 56 - At Cedar Creek Natural History Area, experimental...Ch. 56 - Given that ectotherms do not utilize a large...Ch. 56 - Given that, in general, energy input is greatest...Ch. 56 - Prob. 3SCh. 56 - Explain several detailed ways in which increasing...
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- Studies that demonstrate that species living in an ecological community change independently of one another in space and time a. indicate that the species arrived in the community at different times. b. indicate that the species’ realized niches are regulated by different aspects of the environment. c. suggest species interactions are the sole determinant of which species coexist in a community. d. None of the choices is correct.arrow_forwardThe figure below shows the growth of two species in two habitats, both when the other species is present and when it is absent. What kind of interaction is occurring between these two species? (Consider both habitats, not just the interaction within one particular habitat.) Answer choices: A. Mutualism B. Conditional C. Commensalism D. Competition E. Parasitismarrow_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_forward
- An example of a pioneer species in primary succession and a pioneer species in secondary succession, respectively, are Select one: a. lichens and grass b. moss and insects c. lichens and trees d. grass and shrubsarrow_forwardThe average niche breadth for space resources is wide for species of barnacles in an intertidal community. This pattern would indicate… a. niche overlap is low b. a greater level of competition between species c. coexistence via resource partitioning d. a greater number of species in the community e. high levels of disturbancearrow_forwardSpecies that are the first colonists in a habitat undergoing primary succession a. are usually the fiercest competitors. b. help maintain their habitat constant so their persistence is ensured. c. may change their habitat in a way that favors the invasion of other species. d. must first be successful secondary succession specialists.arrow_forward
- The average niche breadth for space resources is narrow for a community of intertidal organisms. This pattern would indicate… a. a fewer number of species in the community b. niche overlap is high c. resource partitioning d. high levels of disturbance e. extinction via competitive exclusionarrow_forwardWhat are some conditions that might lead to a mutualistic organism becoming a predator/parasite. Select all that apply. A. Mutualistic nitrogen fixation bacteria might reduce the competitive ability of their host plants in environments with high N availability, because of the energetic costs to the plants of supporting the bacteria B. none of the above C. Mutualistic nitrogen fixing bacteria can become parasites in soil with low nitrogen availability because of the energy costs to the plant of supporting the bacteria D. A mutualist fish species that feeds on ectoparasites of another fish species, might switch to feeding/removing important host tissue or secretions when ectoparasite abundance is too low.arrow_forwardAnannual plant when initially colonizing an area will probably demonstrate:a.annual growth rate.b.geometric population growth.c.exponential growth rate.d.logistic growth.e.none of the choices apply.arrow_forward
- 2) The intermediate disturbance hypothesis proposes that __________. A. the highest diversity in communities is maintained by an intermediate level of disturbance B. species that are disturbed frequently have intermediate levels of abundance within communities C. through time all communities will experience an intermediate level of disturbance D. disturbances within a community will always cause an intermediate level of diversity E. community diversity is always reduced by disturbancearrow_forwardThe impacts on fire regimes in the US is strongly correlated with the change in priority given to cultural, regulating, provisioning and supporting ecosystem services. A. How did those priorities change? explain using examples B. What did that change in priority do to fire regimes present and future? C. will the changes in fire regimes benefit fire dependent or fire tolerant species? explain your reasoning, use examples)arrow_forwardEach species has a particular niche within a community. This niche is defined by which two sets of factors? a. Net primary productivity and physical environment b. Functional role and net primary productivity c. Net primary productivity and biological environment d. Physical environment and functional rolearrow_forward
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