Genomic islands of divergence in the Yellow Tang and the Brushtail Tang Surgeonfishes
| Autor: | Nicole L. Crane, Michelle J. Paddack, Peter T. Nelson, Giacomo Bernardi, John Rulmal |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
education.field_of_study Evolutionary Biology Zebrasoma scopas biology Phylogenetic tree population genomics Ecology Population outlier loci Zebrasoma flavescens biology.organism_classification Acanthuridae Divergence Population genomics 03 medical and health sciences 030104 developmental biology Evolutionary biology Species delimitations education Ecology Evolution Behavior and Systematics Nature and Landscape Conservation Local adaptation |
| Zdroj: | Ecology and evolution, vol 8, iss 17 |
| ISSN: | 2045-7758 |
| Popis: | The current ease of obtaining thousands of molecular markers challenges the notion that full phylogenetic concordance, as proposed by phylogenetic species concepts, is a requirement for defining species delimitations. Indeed, the presence of genomic islands of divergence, which may be the cause, or in some cases the consequence, of speciation, precludes concordance. Here, we explore this issue using thousands of RAD markers on two sister species of surgeonfishes (Teleostei: Acanthuridae), Zebrasoma flavescens and Z. scopas, and several populations within each species. Species are readily distinguished based on their colors (solid yellow and solid brown, respectively), yet populations and species are neither distinguishable using mitochondrial markers (cytochrome c oxidase 1), nor using 5193 SNPs (pairwise Φst = 0.034). In contrast, when using outlier loci, some of them presumably under selection, species delimitations, and strong population structure follow recognized taxonomic positions (pairwise Φst = 0.326). Species and population delimitation differences based on neutral and selected markers are likely due to local adaptation, thus being consistent with the idea that these genomic islands of divergence arose as a consequence of isolation. These findings, which are not unique, raise the question of a potentially important pathway of divergence based on local adaptation that is only evident when looking at thousands of loci. |
| Databáze: | OpenAIRE |
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