Intersexual plasticity in aspects of the biology of the mudskipper Periophthalmus barbarus (Gobhdae) in the mangrove swamps of IMO Estuary, Nigeria  

作　　者：Mfon T. Udo (Department of Fisheries and Aquaculture University of Uyo, PMB 1017, Uyo Akwa Ibom State, Nigeria.) 

出　　处：《Journal of Environmental Sciences》2002年第1期95-101,共7页环境科学学报（英文版）

摘　　要：Between April 1992 and March 1993, intersexual plasticity in aspects of the biology of the mudskipper, Periophthalmus barbarus was studied. Sex was differentiated on the basis of the genital papillae, it was broader in females than males. Sexually active females were slightly heavier than similarly sized males. Sex ratio was strongly female biased. Length weight relationship of the sexes was isometric. There was no significant difference in the feeding intensity of both sexes; uniformity was also apparent in diet breadth. There was no named sex based difference in hepatosometic index but condition index was higher in males than females. The uniformity in intersexual plasticity of P.barbarus is consequent upon homogeneity of the mangrove ecosystem, which can only be altered anthropogenically.Between April 1992 and March 1993, intersexual plasticity in aspects of the biology of the mudskipper, Periophthalmus barbarus was studied. Sex was differentiated on the basis of the genital papillae, it was broader in females than males. Sexually active females were slightly heavier than similarly sized males. Sex ratio was strongly female biased. Length weight relationship of the sexes was isometric. There was no significant difference in the feeding intensity of both sexes; uniformity was also apparent in diet breadth. There was no named sex based difference in hepatosometic index but condition index was higher in males than females. The uniformity in intersexual plasticity of P.barbarus is consequent upon homogeneity of the mangrove ecosystem, which can only be altered anthropogenically.

关 键 词：intersexual plasticity Periophthalmus barbarus mangrove swamp length  weight relationship feeding intensity 

分 类 号：X173[环境科学与工程—环境科学] Q959.4[生物学—动物学]