cuning conform to the predictions of the CCPM. Sites closest to the periphery exhibited increased within-population relatedness and decreased effective population size.Main conclusionsDespite the potential for homogenizing gene flow along the Kuroshio Current, peripheral populations in C. We found signatures of isolation-by-distance and significant genetic differences between nearly all sites. cuning species range and examination of SNPs putatively under divergent selection suggested potential for local adaptation in this region. cuning along the Kuroshio Current.ResultsPrincipal component and cluster analyses indicated a genetically distinct lineage at the periphery of the C. We tested for the genetic patterns expected by the CCPM in peripheral populations that are located within the Kuroshio Current for the Indo-Pacific reef fish, Caesio cuning.MethodsWe used a panel of 2,677 SNPs generated from restriction site-associated DNA (RAD) sequencing to investigate genetic diversity, relatedness, effective population size, and spatial patterns of population connectivity from central to peripheral populations of C.
In tropical marine species with pelagic larvae, powerful western-boundary currents have great potential to shape the genetic characteristics of peripheral populations at latitudinal extremes. When isolation leads to genetic divergence, these peripheral populations have high evolutionary value and can influence biogeographic patterns. AimMayr's central-peripheral population model (CCPM) describes the marked differences between central and peripheral populations in genetic diversity, gene flow, and census size.
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