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Test Bank for Marine Biology: Function, Biodiversity, Ecology 2E - page 32 / 44





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a. Usually found in the highest part of the intertidal

b. Not usually able to get to prey in the highest part of the intertidal

c. Generally nonselective

d. Always visual in prey detection

Swash riders

a. Always are found in the lowest part of the intertidal

b. Migrate in longshore currents

c. Change vertical position to stay in wave-stirred sediments

d. Change veritical position to stay in moist, undisturbed sediments

Connell's experiments demonstrated

a. Barnacles settle randomly in the intertidal

b. The adult vertical distribution is greater than that of the newly settled larvae

c. Predation by snails is concentrated in the low part of a rocky shore

d. All of the above

Infaunal bivalve species may reduce competition by

a. Feeding on different types of phytoplankton

b. Living at different depths below the sediment-water interface

c. Living on the sediment surface

d. Being inactive for much of the year and being active in a time such as winter when other bivalves are inactive

In character displacement

a. Coexisting species exploit different resources in the same way in all localities

b. Coexisting species change resource exploitation in an identical way along an environmental gradient

c. Coexisting species exploit the same resources when alone, but diverge in resource exploitation when coexisting

d. Predators cause a change in morphology of the prey

Keystone species

a. Are primary producers

b. Are superior competitors and affect community structure

c. Affect community structure by preying on competitively important prey species

d. Are found only in the intertidal zone

Predation is generally

a. Important in rocky shores but unimportant on soft intertidal sediments

b. Seasonal only on rocky shores

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