Genetic structure of the giant clam Tridacna derasa from five areas in Asia and the Pacific
1994
Gomez, E.D. | Ablan, M.C. | Macaranas, J.M.
An investigation of genetic diversity and population structure based on isozyme electrophoresis at nine polymorphic loci of Tridacna derasa clams indicated considerable divergence between populations from Fiji, Tonga, the Philippines, Palau, and the great Barrier Reef in Australia. Tissue samples were collected from a wild population in Tonga and F1 progeny from a population in Palau. Data from these were analyzed together with previously acquired information for clams from the GBR, Fiji, and the Philippines. Estimates of Nei's unbiased genetic distance (D)=0.137-0.341 indicate a clustering of the west Pacific Philippine and Palau F1 population, clustering of these with the GBR population, and a greater distinction of both groups from the east Pacific populations from Fiji and Tonga. The MDH-1* locus appeared to be fixed in the majority of the populations. The most common allele was the same for all populations at the MDH-2*, LDH*, and GSR* loci. Mean heterozygosity for both Fiji and Tonga (17-19 percent) populations are low compared to the other populations, including F1 from Palau. The importance of establishing existing genetic diversity of tridacnid species in view of the present move to produce clams in hatcheries for both mariculture and restocking purposes are briefly discussed
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