期刊
MOLECULAR PHYLOGENETICS AND EVOLUTION
卷 110, 期 -, 页码 122-126出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ympev.2017.03.011
关键词
Mitonuclear discordance; Hybridization; Dusky shark; Galapagos shark; Population genomics; Gene capture
资金
- National Science Foundation [DEB-01132229]
- Direct For Biological Sciences
- Division Of Environmental Biology [1541556] Funding Source: National Science Foundation
We use a genomic sampling of both nuclear and mitochondrial DNA markers to examine a pattern of genetic admixture between Carcharhinus galapagensis (Galapagos sharks) and Carcharhinus obscurus (dusky sharks), two well-known and closely related sharks that have been recognized as valid species for more than 100 years. We describe widespread mitochondrial-nuclear discordance in which these species are readily distinguishable based on 2152 nuclear single nucleotide polymorphisms from 910 independent autosomal regions, but show pervasive mitochondrial admixture. The species are superficially morphologically cryptic as adults but show marked differences in internal anatomy, as well as niche separation. There was no indication of ongoing hybridization between the species. We conclude that the observed mitochondrial-nuclear discordance is likely due to historical mitochondrial introgression following a range expansion. (C) 2017 Elsevier Inc. All rights reserved.
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