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Variable functional responses of a marine predator in dissimilar homogeneous microhabitats
Lipcius, RN Hines, Anson
Lipcius, RN
Hines, Anson
Abstract
Adult soft-shelled clams (Mya arenaria) persist at low densities in Chesapeake Bay sandy habitats despite Intense predation by blue crabs (Callinectes sapidus). Clam persistence may be a consequence of variation in blue crab foraging rates as a function of clam density and sediment composition. In laboratory aquaria, we measured the functional responses (prey consumption per predator as a function of prey density) of large blue crabs to six densities of adult soft-shelled clams buried at natural depths in two sediment types (mud and sand). Functional responses in sand and mud were differentiated statistically by analyses of(1) residuals and residual sums of squares of discrete and continuous-time models, and (2) the exponent {3 of a general functional response model. .
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1986-12-01
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Fisheries Science Peer-Reviewed Articles, blue crabs, predation, soft shelled clams
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Virginia Institute of Marine Science