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Strong population structure despite evidence of recent migration in a selfing hermaphroditic vertebrate, the mangrove killifish ( Kryptolebias marmoratus )
Author(s) -
TATARENKOV ANDREY,
GAO HONG,
MACKIEWICZ MARK,
TAYLOR D. SCOTT,
TURNER BRUCE J.,
AVISE JOHN C.
Publication year - 2007
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/j.1365-294x.2007.03349.x
Subject(s) - biology , selfing , killifish , biological dispersal , population , outcrossing , evolutionary biology , genetic diversity , population bottleneck , ecology , zoology , microsatellite , genetics , fishery , allele , pollen , demography , sociology , fish <actinopterygii> , gene
We employ a battery of 33 polymorphic microsatellite loci to describe geographical population structure of the mangrove killifish ( Kryptolebias marmoratus ), the only vertebrate species known to have a mixed‐mating system of selfing and outcrossing. Significant population genetic structure was detected at spatial scales ranging from tens to hundreds of kilometres in Florida, Belize, and the Bahamas. The wealth of genotypic information, coupled with the highly inbred nature of most killifish lineages due to predominant selfing, also permitted treatments of individual fish as units of analysis. Genetic clustering algorithms, neighbour‐joining trees, factorial correspondence, and related methods all earmarked particular killifish specimens as products of recent outcross events that could often be provisionally linked to specific migration events. Although mutation is the ultimate source of genetic diversity in K. marmoratus , our data indicate that interlocality dispersal and outcross‐mediated genetic recombination (and probably genetic drift also) play key proximate roles in the local ‘clonal’ dynamics of this species.