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  • Cytonuclear evidence for hybridogenetic reproduction in natural populations of the Australian carp gudgeon (Hypseleotris: Eleotridae)

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    Author(s)
    Schmidt, Daniel J
    Bond, Nicholas R
    Adams, Mark
    Hughes, Jane M
    Griffith University Author(s)
    Hughes, Jane M.
    Schmidt, Daniel J.
    Bond, Nick R.
    Year published
    2011
    Metadata
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    Abstract
    Although most vertebrates reproduce sexually, a small number of fishes, amphibians, and reptiles are known in which reproduction is asexual i.e. without meiotic recombination. In fishes, these so-called "unisexual" lineages usually comprise only females, and utilize co-occurring males of a related sexual species to reproduce via gynogenesis or hybridogenesis. Here we examine patterns of microsatellite and mitochondrial DNA (mtDNA) variation in a widespread group of freshwater fishes (carp gudgeons; Hypseleotris spp.) to investigate a long-standing proposal that this group includes unisexual forms. We show that the mtDNA ...
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    Although most vertebrates reproduce sexually, a small number of fishes, amphibians, and reptiles are known in which reproduction is asexual i.e. without meiotic recombination. In fishes, these so-called "unisexual" lineages usually comprise only females, and utilize co-occurring males of a related sexual species to reproduce via gynogenesis or hybridogenesis. Here we examine patterns of microsatellite and mitochondrial DNA (mtDNA) variation in a widespread group of freshwater fishes (carp gudgeons; Hypseleotris spp.) to investigate a long-standing proposal that this group includes unisexual forms. We show that the mtDNA genome of most carp gudgeons in tributaries of the Goulburn River belong to one of two deeply divided clades (~10% cyt b divergence) and that nuclear variation divides the same individuals into four distinct groups. Group 1 exhibits the genotypic proportions of a random mating population and has a 1:1 sex ratio. Two other groups are extremely sex-biased (98% male, 96% female), exhibit excess heterozygosity at most loci and share at least one allele per locus with group 1. We propose that these two groups represent "unisexual" hybridogenetic lineages, and that both utilize co-occurring group 1 as sexual host. Interestingly, the fourth distinct group appears to represent hybrid offspring of the two putative hybridogenetic lineages. The propagation of clonal haploid genomes by both males and females and the ability of these clones to unite and form sexually mature diploid hybrid offspring may represent a novel mechanism that contributes to the dynamics of coexistence between hybridogenetic lineages and their sexual hosts.
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    Journal Title
    Molecular Ecology
    Volume
    20
    Issue
    16
    DOI
    https://doi.org/10.1111/j.1365-294X.2011.05206.x
    Copyright Statement
    © 2011 Blackwell Publishing, Ltd. This is the pre-peer reviewed version of the following article: Cytonuclear evidence for hybridogenetic reproduction in natural populations of the Australian carp gudgeon (Hypseleotris: Eleotridae), Molecular Ecology, Volume 20, Issue 16, pages 3367–3380, August 2011, which has been published in final form at http://dx.doi.org/10.1111/j.1365-294X.2011.05206.x
    Subject
    Freshwater Ecology
    Life Histories
    Population, Ecological and Evolutionary Genetics
    Biological Sciences
    Publication URI
    http://hdl.handle.net/10072/42230
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    • Journal articles

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