Intraspecific variation of reproductive strategies of the crab Sesarma intermedia: a consequence of habitat variations
Reproductive strategies in relation to nitrogen (N) availability and Chlorophyla concentration in natural habitats, and timing of the active and reproductive period were studied and compared among four populations of Sesarma intermedia: three populations located upstream at sites (hereinafter referred as Lower, Middle and Upper) along Okinohata River, which empties into Ariake Bay, and the fourth population (Tatara) located along Tatara River which flows into Hakata Bay. The two rivers are about 80 km apart. The Upper site had the highest plant N and Chla concentrations and population reproductive activities. The beginning of activity (after the hibernation period) for Tatara population started 1 mo later than the other populations; thus the hepatopancreas and gonad activities and reproductive timing were out of phase with the Okinohata populations. Lowest N and Chla concentrations, gonad activity, and N storage in the hepatopancreas during the breeding period were characteristic features of the Lower site/population. Females of all populations laid eggs of more or less similar sizes, but there were variations in egg weights: the Upper population females had the heaviest eggs. Different energy trade offs seemed to exist between sexes and among populations. With the exception of the Upper population, energy allocated for egg production decreased with body weight/size. In the Upper population, energy allocated for both egg production and sperm production increased with body weight.
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Document Type: Research Article
Publication date: 2000-01-01
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