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    J Evol Biol. 2004 Nov;17(6):1400-1; discussion 1402-4.

    Synergistic epistasis and alternative hypotheses.

    Source

    Department of Ecology and Evolution, University of Lausanne, Lausanne, Switzerland. sandrine.trouve@ie-zea.unil.ch

    Abstract

    Inbreeding generally results in deleterious shifts in mean fitness. If the fitness response to increasing inbreeding coefficient is non-linear, this suggests a contribution of epistasis to inbreeding depression. In a cross-breeding experiment, Salathe & Ebert (2003. J. Evol. Biol. 16: 976-985) tested and found the presence of this non-linearity in Daphnia magna. They argue that epistatic interactions cause this non-linearity. We argue here that their experimental protocol does not allow disentangling the effect of synergistic epistasis from two alternative hypotheses, namely hybrid vigour and statistical non-independence of data.

    PMID:
    15525424
    [PubMed - indexed for MEDLINE]

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