Strong inbreeding depression in male mating behaviour in a poeciliid fish

O Ala-Honkola, A Uddström, Diaz Pauli B, Kai Lindström

    Research output: Contribution to journalArticleScientificpeer-review

    44 Citations (Scopus)


    The magnitude of inbreeding depression is often larger in traits closely related to fitness, such as survival and fecundity, compared to morphological traits. Reproductive behaviour is also closely associated with fitness, and therefore expected to show strong inbreeding depression. Despite this, little is known about how reproductive behaviour is affected by inbreeding. Here we show that one generation of full-sib mating results in a decrease in male reproductive performance in the least killifish (Heterandria formosa). Inbred males performed less gonopodial thrusts and thrust attempts than outbred males (delta = 0.38). We show that this behaviour is closely linked with fitness as gonopodial performance correlates with paternity success. Other traits that show inbreeding depression are offspring viability (delta = 0.06) and maturation time of males (delta = 0.19) and females (delta = 0.14). Outbred matings produced a female biased sex ratio whereas inbred matings produced an even sex ratio.
    Original languageUndefined/Unknown
    Pages (from-to)1396–1406
    Number of pages11
    JournalJournal of Evolutionary Biology
    Issue number7
    Publication statusPublished - 2009
    MoE publication typeA1 Journal article-refereed


    • Heterandria formosa
    • inbreeding depression
    • life history traits
    • offspring size
    • paternity success
    • Poeciliidae
    • reproductive behaviour
    • sex ratio

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