Population genomics of an endemic Mediterranean fish: differentiation by fine scale dispersal and adaptation

• DOI: 10.1038/srep43417
• Publication Date: 2017-03-06T12:52:19Z
• Authors: Carlos Carreras; Víctor Ordóñez; Lorenzo Zane; Claudia Kruschel; Ina Nasto; Enrique Macpherson; Marta Pascual
• Keywords: Population genomics; Population Genetics; Local adaptation

The assessment of the genetic structuring biodiversity is crucial for management and conservation. For species with large effective population sizes a low number markers may fail to identify structure. A solution this shortcoming can be high-throughput sequencing that allows genotyping thousands on genome-wide approach while facilitating detection shaped by selection. We used Genotyping-by-Sequencing (GBS) 176 individuals endemic East Atlantic peacock wrasse (Symphodus tinca), from 6 locations in Adriatic Ionian seas. obtained total 4,155 polymorphic SNPs we observed two strong barriers gene flow. first one differentiated Tremiti Islands, northwest, all other second separated east south-west localities. Outlier potentially under positive selection neutral both showed similar patterns structuring, although finer scale differentiation was unveiled outlier loci. Our results reflect complexity structure demonstrate habitat fragmentation are play. This should considered assessments different taxa, including non-model yet ecologically relevant organisms.