Bio 121 Campbell Biology Truman College
17th Edition
ISBN: 9781323670637
Author: Urry, Cain
Publisher: PEARSON
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Chapter 54.2, Problem 4CC
MAKE CONNECTIONS Ø Rising atmospheric CO2, levels lead to ocean acidification (see Figure 3.12) and higher ocean temperatures, both of which can reduce krill abundance. Predict how a drop in krill abundance might affect other organisms in the food web shown in Figure 54.15. Which organisms are particularly at risk? Explain.
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OBSERVATIONS
• Sea otters feed significantly on sea urchins, often keeping urchin abundance 'in check'.
• Sea urchins feed heavily on kelp, decimating kelp forests when urchin abundance is high.
• Kelp forests protect the shoreline from coastal erosion by buffering wave action.
• Orcas have been observed feeding on sea otters in the kelp forests of western Alaska.
Table 1. Hypothesizing the relationship(s) between orcas, otters, urchins, kelp, and erosion.
↑ = increasing; V = decreasing
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orcas
sea otters
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orcas
sea otters
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kelp
coastal erosion
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kelp
coastal erosion
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sea urchins
coastal erosion
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sea urchins
coastal erosion
Choose One:
sea otters
coastal erosion
Choose One:
sea otters
coastal erosion
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orcas
sea urchins
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Below is a diagram of a complex food web. Match the removal of an individual species with the
result in the food web.
Mackerel
Tuna
Krill
Seal
Herring
Seals are hunted to local extinction in this
community
Phytoplankton populations crash because an
herbicide leaked into the water
The dogfish population is decimated by a
disease
Dogfish
Plankton
[Choose ]
[Choose ]
Cod
[Choose ]
Scallop
>
>
Consider a trophiccascade with 4 levels: 1) predatory fish that consume planktivorous fish, 2) planktivorous fish that consume zooplankton,3) herbivorous zoplankton that consume phytoplankton, and 4) phytoplankton.
True or False: A reduction in predatory fish will increase the level of phytoplankton.
True
False
Chapter 54 Solutions
Bio 121 Campbell Biology Truman College
Ch. 54.1 - Explain how competition, predation, and mutualism...Ch. 54.1 - According to the principle of competitive...Ch. 54.1 - MAKE CONNECTIONS Figure 24.14 illustrates how a...Ch. 54.2 - What two components contribute to species...Ch. 54.2 - How is a food chain different from a food web?Ch. 54.2 - Prob. 3CCCh. 54.2 - MAKE CONNECTIONS Rising atmospheric CO2, levels...Ch. 54.3 - Why do high and low levels of disturbance usually...Ch. 54.3 - Prob. 2CCCh. 54.3 - WHAT IF? Most prairies experience regular fires,...
Ch. 54.4 - Describe two hypotheses that explain why species...Ch. 54.4 - Prob. 2CCCh. 54.4 - WHAT IF? Based on MacArthur and Wilson's island...Ch. 54.5 - What are pathogens?Ch. 54.5 - WHAT IF? Rabies, a viral disease in mammals, is...Ch. 54 - Interspecific interactions affect the survival and...Ch. 54 - Based on indexes such as Shannon diversity, is a...Ch. 54 - Is the disturbance pictured in figure 54.25 more...Ch. 54 - How have periods of glaciation influenced...Ch. 54 - Prob. 54.5CRCh. 54 - Prob. 1TYUCh. 54 - The principle of competitive exclusion states that...Ch. 54 - Based on the intermediate disturbance hypothesis,...Ch. 54 - According to the island equilibrium model, species...Ch. 54 - Prob. 5TYUCh. 54 - Prob. 6TYUCh. 54 - Prob. 7TYUCh. 54 - The most plausible hypothesis to explain why...Ch. 54 - Community 1 contains 100 individuals distributed...Ch. 54 - Prob. 10TYUCh. 54 - EVOLUTION CONNECTION Explain why adaptations of...Ch. 54 - Prob. 12TYUCh. 54 - WRITE ABOUT A THEME: INTERACTIONS In Batesian...Ch. 54 - Prob. 14TYU
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