Genetic patterns in peripheral marine populations of the fusilier fish Caesio cuning within the Kuroshio Current
| Autor: | Yuichi Akita, Amanda S. Ackiss, Mudjekeewis D. Santos, Christopher E. Bird, Katsunori Tachihara, Kent E. Carpenter |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Population Biology RAD sequencing peripheral populations 03 medical and health sciences Effective population size Genetic drift 14. Life underwater Caesio cuning education dispersal Ecology Evolution Behavior and Systematics Nature and Landscape Conservation Local adaptation Original Research genetic divergence education.field_of_study Genetic diversity Ecology genetic diversity Genetic divergence 030104 developmental biology Evolutionary biology Biological dispersal gene flow |
| Zdroj: | Ecology and Evolution |
| ISSN: | 2045-7758 |
| Popis: | Aim Mayr's central‐peripheral population model (CCPM) describes the marked differences between central and peripheral populations in genetic diversity, gene flow, and census size. When isolation leads to genetic divergence, these peripheral populations have high evolutionary value and can influence biogeographic patterns. 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. 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. Methods We 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. cuning along the Kuroshio Current. Results Principal component and cluster analyses indicated a genetically distinct lineage at the periphery of the C. cuning species range and examination of SNPs putatively under divergent selection suggested potential for local adaptation in this region. We found signatures of isolation‐by‐distance and significant genetic differences between nearly all sites. Sites closest to the periphery exhibited increased within‐population relatedness and decreased effective population size. Main Conclusions Despite the potential for homogenizing gene flow along the Kuroshio Current, peripheral populations in C. cuning conform to the predictions of the CCPM. While oceanography, habitat availability, and dispersal ability are all likely to shape the patterns found in C. cuning across this central‐peripheral junction, the impacts of genetic drift and natural selection in increasing smaller peripheral populations appear to be probable influences on the lineage divergence found in the Ryukyu Islands. |
| Databáze: | OpenAIRE |
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