A hybrid zone and bidirectional introgression between two catadromous species: Australian bass Macquaria novemaculeata and estuary perch Macquaria colonorum

Kim Shaddick, Christopher Burridge, Dean Jerry, Tonia Schwartz, Kiet Truong, Dean Gilligan, Luciano Beheregaray

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    8 Citations (Scopus)

    Abstract

    The presence and distribution of hybrid individuals and the existence of a hybrid zone between the catadromous Australian bass Macquaria novemaculeata and estuary perch Macquaria colonorum were investigated throughout the range of both species in Australia. Bayesian analyses and genotypic simulations identified 140 putative hybrids (11·5% of the total sample) with varying levels of introgression. Most hybrids were observed in an area extending from the Snowy River to the Albert River suggesting a hybrid zone in the eastern Bass Strait region. Sixteen hybrids, however, were found outside this zone, possibly reflecting the movement of hybrid offspring between estuaries or their inadvertent release during fish stocking programmes. Biparental backcrossing was found to occur suggesting that hybrids were fertile. These results have implications for the management of the extensive stocking programme in M. novemaculeata and for understanding the potential role of habitat degradation and reduced water flow in facilitating hybridization in species with migratory life histories.

    Original languageEnglish
    Pages (from-to)1214-1235
    Number of pages22
    JournalJournal of Fish Biology
    Volume79
    Issue number5
    DOIs
    Publication statusPublished - Nov 2011

    Keywords

    • Backcrossing
    • Catadromy
    • Conservation genetics
    • Fish stocking
    • Hybrid zone
    • Hybridization

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