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Journal of Heredity Advance Access published online on January 11, 2006
Journal of Heredity, doi:10.1093/jhered/esj005
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© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.
Received April 18, 2005
Accepted October 11, 2005

Brief Communication

Genetic Clines in the Bay of Biscay Provide Estimates of Migration for Sardina pilchardus

V. Laurent 1, M. Voisin 1, and S. Planes 1 *

1 From the Ecole Pratique des Hautes Etudes--UMR CNRS 8046, Laboratoire d'Ichtyoécologie Tropicale et Mediterranéenne, Université de Perpignan, 52, Avenue Paul Alduy, 66860 Perpignan cedex, France

* To whom correspondence should be addressed.
S. Planes, E-mail: planes{at}univ-perp.fr


  Abstract

Nine allozymic loci in 1,635 individuals of Sardina pilchardus obtained at 33 sites ranging from the North to the South limits of the Bay of Biscay were analyzed to provide a description of the genetic structure of the sardine population. Individual body size and age were also recorded and analyzed. In the study population, weak but significant genetic differences were found, and a cline was observed between multilocus heterozygosity and longitude. The cline was predominantly driven by allelic frequencies of two loci, PGM-1* and PEP-lt*, and using a cline model, we estimated a migration rate of 103.1 km/gen (dispersal distance per generation). In addition, we observed that the cline was linked to biological data such as mean length and mean age of the fish. Two hypotheses may explain this cline: mixing of two different populations in the Bay of Biscay or a selective process. The weak genetic differences, the important dispersal distance per generation, and the link between genetic and biological data suggest that selection is likely to be the primary factor that maintains the cline.


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