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Mature male parr contribution to the effective size of an anadromous Atlantic salmon (Salmo salar) population over 30 years
Authors:Devon L. Johnstone  Michael F. O'Connell  Friso P. Palstra  Daniel E. Ruzzante
Affiliation:1. Department of Biology, Dalhousie University, , Halifax, NS, Canada, B3H 4R2;2. Fisheries and Oceans Canada, , St. John's, NF, Canada, A1C 5X1;3. CNRS UMR 7206 Eco‐anthropologie et Ethnobiologie, Equipe “Génétique des populations humaines”, Muséum National d'Histoire Naturelle, , Paris Cedex 05, F‐75231 France
Abstract:We describe temporal changes in the genetic composition of a small anadromous Atlantic salmon (Salmo salar) population from South Newfoundland, an area where salmon populations are considered threatened (COSEWIC 2010). We examined the genetic variability (13 microsatellite loci) in 869 out‐migrating smolt and post‐spawning kelt samples, collected from 1985 to 2011 for a total of 22 annual collections and a 30 year span of assigned cohorts. We estimated the annual effective number of breeders (Nb) and the generational effective population size (Ne) through genetic methods and demographically using the adult sex ratio. Comparisons between genetic and demographic estimates show that the adult spawners inadequately explain the observed Ne estimates, suggesting that mature male parr are significantly increasing Nb and Ne over the study period. Spawning as parr appears to be a viable and important strategy in the near absence of adult males.
Keywords:Atlantic salmon  conservation genetics  effective population size  life history evolution  population genetics—  empirical
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