Home ground advantage: Local Atlantic salmon have higher reproductive fitness than dispersers in the wild

Science Advances
Kenyon B MobleyCraig R Primmer

Abstract

A long-held, but poorly tested, assumption in natural populations is that individuals that disperse into new areas for reproduction are at a disadvantage compared to individuals that reproduce in their natal habitat, underpinning the eco-evolutionary processes of local adaptation and ecological speciation. Here, we capitalize on fine-scale population structure and natural dispersal events to compare the reproductive success of local and dispersing individuals captured on the same spawning ground in four consecutive parent-offspring cohorts of wild Atlantic salmon (Salmo salar). Parentage analysis conducted on adults and juvenile fish showed that local females and males had 9.6 and 2.9 times higher reproductive success than dispersers, respectively. Our results reveal how higher reproductive success in local spawners compared to dispersers may act in natural populations to drive population divergence and promote local adaptation over microgeographic spatial scales without clear morphological differences between populations.

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Citations

Feb 3, 2021·Molecular Ecology·Charles D WatersCraig R Primmer
Jul 13, 2019·Trends in Ecology & Evolution·Donovan A BellAndrew R Whiteley
Mar 25, 2021·Evolution; International Journal of Organic Evolution·Vandana Revathi VenkateswaranChaitanya S Gokhale
May 13, 2021·Ecology and Evolution·Sebastian WackerSten Karlsson
Aug 26, 2021·Evolutionary Applications·Ilana J Koch, Shawn R Narum

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Methods Mentioned

BETA
PCR
genotyping

Software Mentioned

Allelematch
GeneMarker
ONCOR
R
MasterBayes
R package nlme
SoftGenetics
R package lme4
MicroDrop
R package pscl

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