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The Journal of Heredity 2001:92(2)
© 2001 The American Genetic Association 92:146-149

Alternative Mating Strategies in Atlantic Salmon and Brown Trout

E. Garcia-Vazquez, P. Moran, J. L. Martinez, J. Perez, B. de Gaudemar, and E. Beall

From the Departamento de Biologia Funcional, Universidad de Oviedo, C/ Julian Claveria s/n, 33006-Oviedo, Spain (Garcia-Vazquez, Martinez, and Perez), Departamento de Bioquimica, Genetica e Inmunologia, Universidad de Vigo, Facultad de Ciencias, Vigo, Spain (Moran), and Ecologie des Poissons, INRA Station d'Hydrobiologie, Saint Pée sur Nivelle, France (de Gandemar and Beall).

Address correspondence to Eva Garcia-Vazquez at the address above or e-mail: egv{at}sauron.quimica.uniovi.es.

By screening variable number of tandem repeat (VNTR) loci, multiple paternity within clutches has been found in wild populations of southern European Atlantic salmon (Salmo salar) and brown trout (Salmo trutta). For Atlantic salmon, we determined the relative contribution of alternative male phenotypes to the next generation. Individual males that are morphologically juvenile yet sexually mature fertilized a large proportion of eggs, and they thereby contributed to an increase of genetic variability in wild populations via (1) balancing the sex ratio, (2) increasing outbreeding, and (3) enlarging the effective population size, in part a consequence of (1) and (2). In addition, these precocious males ensured that interspecific spawns involving Atlantic salmon females and brown trout males (a fairly common occurrence in southern Europe where the two species are sympatric) resulted mostly in Atlantic salmon progeny. For brown trout, preliminary genetic results indicated that multiple paternity, when present, was not due to alternative mating strategies by males, but rather to successive fertilizations by adult suitors.


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