BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 56, Problem 2A
According to the trophic cascade hypothesis, the removal of carnivores from an ecosystem may result in
a. a decline in the number of herbivores and a decline in the amount of vegetation.
b. a decline in the number of herbivores and an increase in the amount of vegetation.
c. an increase in the number of herbivores and an increase in the amount of vegetation.
d. an increase in the number of herbivores and a decrease in the amount of vegetation.
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EcosystemA hasprimary production of 1000 g C /m2/yr and ecological efficiency of 10%. Ecosystem B has primary production of 300 g C /m2/yr and an ecological efficiency of 25%.
a.Which ecosystem will have more production at thesecondary consumer (carnivore) trophic level?
b.Which ecosystem is more likely to support an endothermic primary consumer (herbivore)?
c.If atrophic level requires at least 1 gC/m2/yr in order to exist, how many trophic levels can each of these ecosystems support?d.Given your answer to part c, which do you thinkhas a larger impact on the energy available at upper trophic levels: primary productivity or efficiency of energy movement across trophic levels?
Which of the following is true about the length of food chains?
a. Food chains can support up to 10 trophic levels.
b. Food chains are shorter in stable habitats.
c. Energy lost as heat at each trophic level limits the length of food chains.
O d. The extinction of a species in a food chain will affect only the species directly preying upon it.
e. An ecosystem with a high-enough number of species will feature a limitless length of food chain.
The elimination of predators by humans
a. will cause its prey to experience exponential growth until new predators arrive or evolve.
b. will lead to an increase in the carrying capacity of the environment.
c. may increase the population size of a prey species if that prey’s population was being regulated by predation from the predator.
d. will lead to an Allee effect.
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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