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Volume :22 Issue : 1 1995      Add To Cart                                                                    Download

Aspects of the life history and seasonal ecology of Nasima dotillformis (Alcock) (Brachyura: Ocypodidae) on a Kuwait mudflat

Auther : R. J. SNOWDEN* AND D. A. CLAYTON**

 * Department of Environmental Sciences, Sir William Halcrow & Partners Ltd., Burderop Park, Swindon SN4 OQD, UK

** Biology Department, Faculty of Science, Sultan Qaboos University, P0 Box 36, Al Khod 123, Muscat, Sultanate of Oman

 ABSTRACT

Data on Nasima dotill between MHWS and MHWN in Sulaibikhat Bay, Kuwait were obtained by sampling every six weeks between May 1988 and March 1989, and from two additional collections.

Carapace width frequency data suggested that in females instar number was variable, or fixed with widely overlapping size ranges, and that in males there were instars at 4.75. 7.25 an.:9.25 mm. The puberty moult was 4.75—7.25mm in males and a proportion of females, and sc’. ratios in all size classes did not differ significantly from 1: 1. The chela propodus grew isometrically in both sexes, and growth of the abdomen ‘S’. negatively allometric in males and positive in immature and isometric in mature females. both sexes the men of the third and fourth ambulatories grew with positive allometry in wic and length, and the level of growth of the male fourth merus was significantly greater than of either females or the third merus.

Population density, biomass and the percentages of juveniles and ovigerous females :

higher in winter (November—March) than summer. Winter was therefore the eco1ogically-aseason, contrary to the cycle normally associated with waters of similar latitude.

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