Evidence of limited gene flow in three species of coral reef fishes in the lagoon of New Caledonia |
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Authors: | S Planes M Parroni C Chauvet |
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Institution: | Ecole Pratique des Hautes Etudes – URA CNRS 1453, Université de Perpignan, F-66860 Perpignan cedex, France, FR Lavoratoire d'Etude des Resources Vivantes et de l'Environnement Marin, Université Fran?aise du Pacifique, BP 4477 Nouméa, New Caledonia, NC
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Abstract: | Allozyme variation was used to investigate the genetic structure of the coral reef fishes Stegastes nigricans, Epinephelus merra and Acanthurus triostegus around New Caledonia. Each species was sampled from each of three sites in the ≃1000 km circumference of the lagoon of New
Caledonia. Allelic variation was recorded for each species at 14, 13 and 17 loci, respectively, and heterozygosity diversity
(H
s) was 0.082, 0.065 and 0.116, respectively. Analysis of genetic differentiation between sites produced inconsistent results
between species, with spatial heterogeneity in two species (S. nigricans, F
st
= 0.038; A. triostegus, F
st = 0.049) and homogeneity in one species (E. merra, F
st = 0.000). Hydrological and climatic data from the lagoon suggest that the eastern and western sides of the lagoon are isolated,
since they lie in water masses of different origin. This may explain the genetic differentiation and restricted gene flow
found at a local scale for S. nigricans and A. triostegus. Homogeneity in populations of E. merra is discussed in relation to its low genetic diversity and its reproductive behaviour.
Received: 23 April 1997 / Accepted: 25 September 1997 |
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Keywords: | |
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