Fine-scale differences in genetic and census population size ratios between two stream fishes |
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Authors: | T A Bernos M C Yates D J Fraser |
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Institution: | 1.Department of Biology,Concordia University,Montreal,Canada |
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Abstract: | Comparing the ratio of effective number of breeders (N b ) to adult population size (N) among closely related coexisting species can provide insights into the role of life history on N b /N ratios and inform conservation programs towards limiting the loss of evolutionary potential in natural populations. We estimated N b and N in two coexisting salmonid fishes (Brook trout and Atlantic salmon) for 3–4 consecutive years in two small, adjacent streams in Newfoundland, Canada, using mark-recapture (N), linkage disequilibrium (N b(LD)), and sibship frequency approaches (N b(Sib) ). We found that N b /N ratios were about 20-fold greater in Atlantic salmon than in brook trout (mean 0.20, range 0.06–0.56 vs. mean 0.02, range 0.01–0.05, respectively). This difference was consistent across N b estimators. In addition, we found that removing migrants reduced N b : the strength of the effect was weak for N b(LD) and much stronger for N b(Sib). Our results highlight the importance of subtle ecological differences and gene flow in shaping N b /N. They also provide some evidence that the linkage between demographic and evolutionary processes varies between closely related taxa and suggest that a more complete understanding of the N b /N range across various species is an important component of conservation genetics and management. |
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