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The ecology of the family Pinnidae was studied by sampling three pinnid species from 36 sampling sites across four different microhabitats in the Gulf of Thailand. The species spatial distributions were mostly uniform, with some populations having random distributions. Species abundances differed between sandy and coral habitats according to non-metric multi-dimension scaling analyses. Although the Gulf of Thailand is a relatively small geographic area, habitats are varied enough to provide variable shell densities. Small islands are important distribution areas, and coral reefs provide both direct and indirect shelter which support high abundances, densities and increased shell size. The highest density was recorded in sand beds within coral reefs. Low density and small shell size in sand beaches might be related to high mortality in shallow water or to adaptations for survival in shallow waters. A clear correlation between sediment composition and species abundance was found in Pinna atropurpurea; abundance increased with the sand content of the sediment. For P. deltodes, abundance increased as the rock fraction of the sediment increased. These results suggest that adaptations in Pinnidae, such as shell size, shell morphology, and the exposure of the shell above the sediment-water interface, are responses for survival in different habitats. 相似文献
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The isopod Nerocila depressa is present on 54% of the market-sized white sardines (Sardinella albella) caught from an estuary in the Trat province of Thailand. The ventral part of the body, especially the upper pectoral fin, was the area most frequently infected by this parasite. Parasite length was positively correlated with fish length, which suggests that the parasites attach to the fish at a young age. At the site of attachment, the parasites erode the epidermis, dermis and muscular tissue of the Sardinella. Such pathology may cause mortality in many fish. Infestation of this parasite was proportional to the weight of the fish. This study reports a new host for N. depressa attachment and is the first report of S. albella infestation in the Trat province where other known host fish species are cultured. 相似文献
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