. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 306 A. M. ADAMCZEWSKA AND S. MORRIS start the journey back inland to the forest, while the females lay their eggs and remain in the burrows for 2 weeks (Hicks. 1985; Hicks et al., 1990). At the end of the incubation period the females vacate their burrows and make their way to the coastal cliffs, which almost completely surround the island, to cast their eggs into the ocean. The females then return to the forest while the crab larvae spend 3-4 weeks at sea before returning to land as juvenile crabs (Gibson-Hill, 1947; Hicks.
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 306 A. M. ADAMCZEWSKA AND S. MORRIS start the journey back inland to the forest, while the females lay their eggs and remain in the burrows for 2 weeks (Hicks. 1985; Hicks et al., 1990). At the end of the incubation period the females vacate their burrows and make their way to the coastal cliffs, which almost completely surround the island, to cast their eggs into the ocean. The females then return to the forest while the crab larvae spend 3-4 weeks at sea before returning to land as juvenile crabs (Gibson-Hill, 1947; Hicks. 1985; Hicks et al., 1990). Since gecarcinid crabs must migrate to the shore to spawn, they must have well-developed navigational mech- anisms. The means of navigation during the migrations are unknown, but visual cues, polarized light, magneto-recep- tion, and learning are thought to be involved (Daumer et al., 1963; Herrnkind, 1968; DeWilde, 1973; Bliss et al., 1978; Lohmann et 1995; Vannini and Cannicci. 1995; Deutschlander et al., 1999). Some data are available on the activity levels of terrestrial crustaceans in the natural environment (, Wolcott and Wolcott, 1985; Gherardi et al., 1988; Gherardi and Vannini, 1989; Micheli et 1990; Weinstein, 1995). but data comparing the activity patterns of gecarcinid crabs during normal foraging activities and during the migration are sparse (see DeWilde, 1973). The ecology of red crabs is characterized by a period of very low activity during the dry season, followed immediately by a breeding migration (Hicks, 1985; Green, 1997) that may require crabs to travel more than 4 km in less than a week. Such abrupt changes in activity levels impose specific demands on the physiology and metabolism patterns of red crabs. The availability of food and water changes on a seasonal basis. Particularly during the migration, this could be a major determinant of the strategy, performance, and diel capacity for exercise. Limitations in foo
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
