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Extensive hybridization and associated geographic trends between two rockfishes S ebastes vulpes and S . zonatus ( T eleostei: S corpaeniformes: S ebastidae)
Author(s) -
Muto N.,
Kai Y.,
Noda T.,
Nakabo T.
Publication year - 2013
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1111/jeb.12175
Subject(s) - biology , vulpes , interspecific competition , hybrid , amplified fragment length polymorphism , introgression , felis , zoology , phylogeography , ecology , hybrid zone , evolutionary biology , genetic diversity , gene flow , phylogenetics , genetic variation , genetics , population , gene , botany , cats , demography , sociology , computer science , predation , embedded system
Interspecific hybridization is an important evolutionary process, which has significant influence on the diversity within and between participating taxa. Although interspecific hybridization in terrestrial and freshwater organisms has been subjected to many detailed studies, studies in marine realm have been limited in terms of both numbers and detail. In this study, the potential for interspecific hybridization between two rockfishes, S ebastes vulpes and S . zonatus , occurring in the western N orth P acific, was assessed on the basis of 177 specimens collected from three sampling localities within the main geographic distribution of both species, and analysed using a combination of amplified fragment length polymorphisms ( AFLP ), mitochondrial DNA (mt DNA ) markers and morphometric characters. Bayesian‐based individual genetic assignment based on 364 AFLP loci detected a total of 63 (35.6%) hybrid specimens in the data set, the presence of interspecific hybrids also being rigorously supported by mt DNA analysis using partial sequences from the control region and morphological analysis based on 31 morphometric characters. Hybrids from all three localities were found, showing a common pattern of biased introgression across the localities whereby hybrids were more closely related to S . zonatus than to S . vulpes . Apart from this common pattern, rates of hybridization varied considerably among the localities, being greater in the northern localities. Variations in the local rates of hybridization were associated with variations in habitat segregation and thermal regime, implying that vertical water temperature regimes determined the extent of habitat segregation of the two species and, accordingly, the opportunity for hybridization.