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Tidal migrations are inherent in the life histories of numerous demersal predators, and both the indirect and direct effects of these forays are important to the structure and function of littoral communities. In coastal estuaries of the Northeastern Pacific, Dungeness crabs Cancer magis- ter are abundant and compose a significant portion of estuarine biomass. The nursery role of complex littoral habitats for young-of-the-year (0+) C. magister is well documented, yet the ecology of subse- quent age classes within coastal estuarine systems, and within littoral areas in particular, remains unclear. The goal of our study was to elucidate habitat use and migratory patterns of subadult C. magister (40 to 130 mm carapace width; 1+ and >1+ yr classes) in littoral eelgrass Zostera marina, oyster Crassostrea gigas, and unstructured littoral habitats (ULH). We employed 3 sampling tech- niques (trapping, acoustic telemetry, and underwater video) designed to examine various aspects of migratory behavior within Willapa Bay, Washington, a representative coastal estuary. Baited trap sur- veys revealed that relative catches of subadult C. magister are 30 to 50% higher on ULH than eel- grass or oyster beds, and are negatively correlated with catches of another large cancrid crab, C. pro- ductus. Ultrasonic telemetry observations suggest that subadult C. magister making nighttime foraging incursions prefer ULH to other littoral habitats, and underwater video observations show that migrations are influenced by tidal rhythms since movements are correlated with the direction and velocity of current flow in adjacent channels. Our results dramatically alter the perception of C. magister as a predominantly sublittoral predator, and underscore the significance of littoral habi- tats as important foraging areas.

Intertidal migration and habitat use by subadult Dungeness crab Cancer magister in a NE Pacific estuary