Geographic isolation and larval dispersal shape seascape genetic patterns differently according to spatial scale

Evolutionary Applications
Alicia DalongevilleStéphanie Manel

Abstract

Genetic variation, as a basis of evolutionary change, allows species to adapt and persist in different climates and environments. Yet, a comprehensive assessment of the drivers of genetic variation at different spatial scales is still missing in marine ecosystems. Here, we investigated the influence of environment, geographic isolation, and larval dispersal on the variation in allele frequencies, using an extensive spatial sampling (47 locations) of the striped red mullet (Mullus surmuletus) in the Mediterranean Sea. Univariate multiple regressions were used to test the influence of environment (salinity and temperature), geographic isolation, and larval dispersal on single nucleotide polymorphism (SNP) allele frequencies. We used Moran's eigenvector maps (db-MEMs) and asymmetric eigenvector maps (AEMs) to decompose geographic and dispersal distances in predictors representing different spatial scales. We found that salinity and temperature had only a weak effect on the variation in allele frequencies. Our results revealed the predominance of geographic isolation to explain variation in allele frequencies at large spatial scale (>1,000 km), while larval dispersal was the major predictor at smaller spatial scale (<1,000 km). Our...Continue Reading

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Citations

Jan 12, 2020·Ecology·Nils C KrueckJennifer R Ovenden
Jul 7, 2020·Genomics·Katharina FietzOscar Puebla
Mar 20, 2021·Molecular Ecology·Brenton von TakachSam C Banks
Sep 30, 2021·Proceedings. Biological Sciences·Giulia Francesca Azzurra DonatiLoïc Pellissier
Oct 31, 2021·The Journal of Animal Ecology·Emilie BoulangerStéphanie Manel
Jan 25, 2022·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Marlene Jahnke, Per R Jonsson

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Methods Mentioned

BETA
PCA
genotyping

Software Mentioned

R
vegan
R package MuMIn
R package “ aem ”
UNEAK
R package “
MASS
MEM
packfor
R package “ polysat

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