Mating behavior of Trissolcus basalis (Wollaston) (Hymenoptera: Scelionidae): potential for outbreeding in a predominantly inbreeding species

Andrew Loch, Gimme Walter

    Research output: Contribution to journalArticle

    16 Citations (Scopus)

    Abstract

    The mating behavior of the quasi-gregarious egg parasitoid Trissolcus basalis (Wollaston) was investigated under field conditions. Trissolcus basalis has female-biased sex ratios and is a protandrous species, with males emerging 1'2 days before females. Males competed aggressively for control of the egg mass, with one male assuming dominance and control of the egg mass, although changes in dominance occurred at least once on each egg mass observed. Typical mating behavior involved the dominant male mating his sisters immediately upon their emergence from the egg mass. These behaviors are characteristic of an inbreeding species that manifests local mate competition. However, several aspects of the mating behavior of T. basalis are inconsistent with that of an inbreeding species. Over 18% of emerging females were not mated by the dominant male upon emergence, 13% of females were not observed to be mated at all and may have left their natal site as virgins, 25% of females were mated multiple times and sometimes by multiple males, females remained near the natal site for up to several hours after emergence before emigrating, and males dispersed away from the natal site during female emergence. Trissolcus basalis may be a predominantly inbreeding species but its emergence and mating behavior suggest that low-frequency outbreeding is also likely to occur.
    Original languageEnglish
    Pages (from-to)13-23
    Number of pages11
    JournalJournal of Insect Behavior
    Volume15
    Issue number1
    DOIs
    Publication statusPublished - 2002

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    Trissolcus basalis
    Scelionidae
    outbreeding
    mating behavior
    inbreeding
    Hymenoptera
    eclosion
    egg masses
    egg
    dominance (genetics)
    egg parasitoid
    sex ratio

    Cite this

    @article{69900bf74f804d788fce5e1ee66c5dc7,
    title = "Mating behavior of Trissolcus basalis (Wollaston) (Hymenoptera: Scelionidae): potential for outbreeding in a predominantly inbreeding species",
    abstract = "The mating behavior of the quasi-gregarious egg parasitoid Trissolcus basalis (Wollaston) was investigated under field conditions. Trissolcus basalis has female-biased sex ratios and is a protandrous species, with males emerging 1'2 days before females. Males competed aggressively for control of the egg mass, with one male assuming dominance and control of the egg mass, although changes in dominance occurred at least once on each egg mass observed. Typical mating behavior involved the dominant male mating his sisters immediately upon their emergence from the egg mass. These behaviors are characteristic of an inbreeding species that manifests local mate competition. However, several aspects of the mating behavior of T. basalis are inconsistent with that of an inbreeding species. Over 18{\%} of emerging females were not mated by the dominant male upon emergence, 13{\%} of females were not observed to be mated at all and may have left their natal site as virgins, 25{\%} of females were mated multiple times and sometimes by multiple males, females remained near the natal site for up to several hours after emergence before emigrating, and males dispersed away from the natal site during female emergence. Trissolcus basalis may be a predominantly inbreeding species but its emergence and mating behavior suggest that low-frequency outbreeding is also likely to occur.",
    keywords = "Inbreeding, Mating behavior, Outbreeding, Sib mating",
    author = "Andrew Loch and Gimme Walter",
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    year = "2002",
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    language = "English",
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    Mating behavior of Trissolcus basalis (Wollaston) (Hymenoptera : Scelionidae): potential for outbreeding in a predominantly inbreeding species. / Loch, Andrew; Walter, Gimme.

    In: Journal of Insect Behavior, Vol. 15, No. 1, 2002, p. 13-23.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Mating behavior of Trissolcus basalis (Wollaston) (Hymenoptera

    T2 - Scelionidae): potential for outbreeding in a predominantly inbreeding species

    AU - Loch, Andrew

    AU - Walter, Gimme

    N1 - Imported on 12 Apr 2017 - DigiTool details were: Journal title (773t) = Journal of Insect Behavior. ISSNs: 0892-7553;

    PY - 2002

    Y1 - 2002

    N2 - The mating behavior of the quasi-gregarious egg parasitoid Trissolcus basalis (Wollaston) was investigated under field conditions. Trissolcus basalis has female-biased sex ratios and is a protandrous species, with males emerging 1'2 days before females. Males competed aggressively for control of the egg mass, with one male assuming dominance and control of the egg mass, although changes in dominance occurred at least once on each egg mass observed. Typical mating behavior involved the dominant male mating his sisters immediately upon their emergence from the egg mass. These behaviors are characteristic of an inbreeding species that manifests local mate competition. However, several aspects of the mating behavior of T. basalis are inconsistent with that of an inbreeding species. Over 18% of emerging females were not mated by the dominant male upon emergence, 13% of females were not observed to be mated at all and may have left their natal site as virgins, 25% of females were mated multiple times and sometimes by multiple males, females remained near the natal site for up to several hours after emergence before emigrating, and males dispersed away from the natal site during female emergence. Trissolcus basalis may be a predominantly inbreeding species but its emergence and mating behavior suggest that low-frequency outbreeding is also likely to occur.

    AB - The mating behavior of the quasi-gregarious egg parasitoid Trissolcus basalis (Wollaston) was investigated under field conditions. Trissolcus basalis has female-biased sex ratios and is a protandrous species, with males emerging 1'2 days before females. Males competed aggressively for control of the egg mass, with one male assuming dominance and control of the egg mass, although changes in dominance occurred at least once on each egg mass observed. Typical mating behavior involved the dominant male mating his sisters immediately upon their emergence from the egg mass. These behaviors are characteristic of an inbreeding species that manifests local mate competition. However, several aspects of the mating behavior of T. basalis are inconsistent with that of an inbreeding species. Over 18% of emerging females were not mated by the dominant male upon emergence, 13% of females were not observed to be mated at all and may have left their natal site as virgins, 25% of females were mated multiple times and sometimes by multiple males, females remained near the natal site for up to several hours after emergence before emigrating, and males dispersed away from the natal site during female emergence. Trissolcus basalis may be a predominantly inbreeding species but its emergence and mating behavior suggest that low-frequency outbreeding is also likely to occur.

    KW - Inbreeding

    KW - Mating behavior

    KW - Outbreeding

    KW - Sib mating

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