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High variability of genetic pattern in giant clam (Tridacna maxima) populations within French Polynesia
Laurent, V.; Planes, S.; Salvat, B. (2002). High variability of genetic pattern in giant clam (Tridacna maxima) populations within French Polynesia. Biol. J. Linn. Soc. 77(2): 221-231
In: Biological Journal of the Linnean Society. Academic Press: London; New York. ISSN 0024-4066, more
Peer reviewed article  

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Keywords
    Genetic diversity; Tridacna maxima (Röding, 1798) [WoRMS]; ISE, French Polynesia [Marine Regions]; Marine

Authors  Top 
  • Laurent, V.
  • Planes, S.
  • Salvat, B.

Abstract
    Nine populations of giant clams, Tridacna maxima, from six islands of French Polynesia were screened for allozyme variation at ten polymorphic loci. The genetic structure of populations of T. maxima were studied at different spatial scales: within an island, between islands of the same archipelago and between archipelagos. Significant genetic differences were observed only between populations from different archipelagos, and genetic differentiation was correlated with geographical separation. However, these results were only supported by a single locus, PEP* and all other loci were homogeneous between studied populations. According to Lewontin & Krakauer's model, the genetic structure can be explained by selection. The selective factors most likely depend on the respective habitat of each archipelago. We also studied genotype-phenotype correlation using the colour of the clam mantle, and did not find any relationship between the mantle colour and the genetic structure of the individuals.

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