Mechanisms of cross-shore distribution pattern of the intertidal mud crabMacrophthalmus japonicus
- 70 Downloads
In the intertidal mud crabMacrophthalmus japonicus, most large crabs occurred in the upper sandy areas. Mechanisms of the size-dependent distribution were interpreted experimentally. In the lower muddy area, food was more abundant and crab density was much higher than in the upper area. Under the high density conditions, interaction among large crabs became severe and more large crabs abandoned their burrows. In the experiment on burrowing-site selection, large crabs burrowed only in the muddy side under the low density, but also in the sandy side under high density conditions. The burrowing in the upper sandy area may be advantageous for large crabs, though food availability is lower, because of less competition and higher survivorship under the low crab density.
Key wordsactivity interaction mud crab size-dependent cross-shore distribution stationary tendency
Unable to display preview. Download preview PDF.
- Bertness M. D. &Miljer T. (1984) The distribution and dynamics ofUca pugnax (Smith) burrows in a New England salt marsh.J. Exp. Mar. Biol. Ecol. 83: 211–37.Google Scholar
- Branch G. M. (1975) Intraspecific competition inPatella cocblear Born.J. Amin. Ecol. 44: 263–81.Google Scholar
- Hartnoll R. G. (1973) Factors affecting the distribution and behaviour of the crabDotilla fenestrata on East Africa shores.Est. Coast. Mar. Sci. 1: 137–52.Google Scholar
- Kurihara Y., Sekimoto K. &Miyata M. (1988) Wancering behaviour of the mud-crabHelice tridens related to evasion of cannibalism.Mar. Ecol. Prog. Ser. 49: 41–50.Google Scholar
- Wada K. (1983) Spatial distributions and population structures inScopimera globosa andIlyoplax pusillus (Decapoda: Ocypodidae).Publ. Seto Mar. Biol. Lab. 27: 281–91.Google Scholar
- Wada K. (1986) Burrow usurpation and duration of surface activity inScopimera globosa (Crustacea: Brachyura: Ocypodidae).Publ. Seto Mar. Biol. Lab. 31: 327–32.Google Scholar
- Wada K. (1991) Biogeographic patterns in waving display, and body size and proportions ofMacrophthalmus japonicus species complex (Crustacea: Brachyura: Ocypodidae).Zool. Sci. 8: 135–46.Google Scholar
- Weeks S. C. (1990) Life-history variation under varying degrees of intraspecific competition in the tadpole shrimpTriops longicaudatus (Leconte).J. Crust. Biol. 10: 498–503.Google Scholar