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Journal of Heredity 2004:95(4):291-300
© 2004 The American Genetic Association

Low Genetic Variability in the Highly Endangered Mediterranean Monk Seal

T. Pastor, J. C. Garza, P. Allen, W. Amos, and A. Aguilar

From the Department of Animal Biology, University of Barcelona, Diagonal 645, 08028 Barcelona, Spain (Pastor and Aguilar); Department of Integrative Biology, University of California, Berkeley, CA 94720-3160 (Garza); Southwest Fisheries Science Center, Santa Cruz Laboratory, 110 Shaffer Rd., Santa Cruz, CA 95060 (Garza); and Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EJ, UK (Allen and Amos).

Address correspondence to Teresa Pastor at the address above, or e-mail: teresa_pastor{at}ub.edu.

Genetic variability is an important component in the ability of populations to adapt in the face of environmental change. Here we report the first description of nuclear genetic variability in the only remaining sizable colony of the Mediterranean monk seal (Monachus monachus), located at Cap Blanc (Western Sahara, Mauritania), whose estimated size during the study period (1994–May 1997) was about 320 individuals. We tested 42 microsatellite loci isolated from five pinniped species in a sample of 52 pups. Three loci failed to give any product, and of the remaining 39, only 15 were polymorphic, with a maximum of 3 alleles detected. Three loci appeared to be X-linked. No departures from Hardy-Weinberg equilibrium were detected and no genetic structure was found between the two nursing caves currently occupied by the seals. Several analytical methods show that, as a consequence of a severe bottleneck, the population has suffered a decrease in genetic variability over the last few centuries.


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