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Volume :21 Issue : 2 1994      Add To Cart                                                                    Download

Aspects of the ecology of Tylodiplax indica Alock (Brachyura: Ocypodidae) on a Kuwait mudflat

Auther : R. J. SNOWDEN*, D. A. CLAYTON** AND E. Y. AL TAHER

  Zoology Department, Kuwait University, P.O. Box 5969, 13060 Safat, Kuwait

ABSTRACT

A mudflat in Sulaibikhat Bay, Kuwait was sampled every six weeks from May 1988—March 1989 at mean high tide level and mean high water neap for the Ocypodid crab Tylodiplax indica. The sexes were in similar total numbers (1167 males, 1180 females)  and carapace width ranges (2.5- 11cm), and carapace width frequency data indicated that instar number was either variable, or fixed with overlapping size ranges. Sex ratios differed from 1: 1 in only one sampling period, but there was a significant female bias in the main ovigerous classes (7—8mm CW) and a male bias in the larger classes.

Density, biomass and the percentage of juveniles were significantly higher in winter (November—March), which was therefore the more ecologically-active season, contrary to the cycle normally associated with waters of similar latitude. This was related to Kuwait’s climate, and associated water temperatures.

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