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Decapod crustaceans are known to exhibit strong diel behavioral patterns. Pink shrimp, Penaeus duorarum, bury themselves in the substrate during light periods, emerging at dusk, but will establish a free rhythm in continuous light (Bishop and Herrnkind, 1976). Norway lobsters, Nephrops norvegicus, emerge from burrows at dusk and dawn, with some activity in between (Chapman and Howard, 1979). Naylor (1958) showed that Carcinus maenas at Swansea, United Kingdom, ex- hibited activity peaks coincident with subjective midnight and expected periods of high tide. These activity periods were amplified in intensity when both con- ditions occurred simultaneously, and dampened when out of phase with each other. The Dungeness crab Cancer magister is a highly motile predatory brachyuran of the Pacific coast of North America. Coastal populations are known to migrate distances as great as 50 km (Waldron, 1958; Gotshall, 1978b), and tagged indi- viduals have been recovered as far as 440 km (Mayer, 1973) from their release sites. Adult crabs move into estuaries (Cleaver, 1949) or out of them (Waldron, 1958), the predominant direction depending upon season and location. There is scant information concerning movement on a short-term, localized basis, in re- lation to environmental conditions or behavioral patterns. However,
Journal of Crustacean Biology – Brill
Published: Jan 1, 1984
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