Local mate competition in the solitary parasitoid wasp Ooencyrtus kuvanae

Local mate competition (LMC) occurs when brothers compete with each other for mating opportunities, resulting in selection for a female-biased sex ratio within local groups. If multiple females oviposit in the same patch, their sons compete for mating opportunities with nonbrothers. Females, in the...

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Veröffentlicht in:Behavioral ecology and sociobiology 2011-05, Vol.65 (5), p.1071-1077
Hauptverfasser: Somjee, Ummat, Ablard, Kelly, Crespi, Bernard, Schaefer, Paul W., Gries, Gerhard
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container_issue 5
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creator Somjee, Ummat
Ablard, Kelly
Crespi, Bernard
Schaefer, Paul W.
Gries, Gerhard
description Local mate competition (LMC) occurs when brothers compete with each other for mating opportunities, resulting in selection for a female-biased sex ratio within local groups. If multiple females oviposit in the same patch, their sons compete for mating opportunities with nonbrothers. Females, in the presence of other females, should thus produce relatively more sons. Sex ratio theory also predicts a more female-biased sex ratio when ovipositing females are genetically related, and sex-ratio responses to foundress size if it differentially affects fitness gains from sons versus daughters. The mating system of the parasitoid wasp Ooencyrtus kuvanae meets assumptions of LMC. Females insert a single egg into each accessible egg of gypsy moth, Lymantria dispar, host egg masses. Wasps complete development inside host eggs and emerge en masse, as sexually mature adults, resulting in intense competition among brothers. We tested the hypothesis that O. kuvanae exhibits LMC by manipulating the number of wasp foundresses on egg masses with identical numbers of eggs. As predicted by LMC theory, with increasing numbers of wasp foundresses on an egg mass, the proportions of emerging sons increased. In contrast, the presence of a sibling compared to a non-sibling female during oviposition, or the size of a female, did not affect the number or sex ratio of offspring produced. The O. kuvanae system differs from others in that larvae do not compete for local resources and thus do not distort the sex ratio in favor of sons. With no resource competition among O. kuvanae larvae, the sex ratio of emergent son and daughter wasps is due entirely to the sex allocation by ovipositing wasp foundresses on host egg masses.
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If multiple females oviposit in the same patch, their sons compete for mating opportunities with nonbrothers. Females, in the presence of other females, should thus produce relatively more sons. Sex ratio theory also predicts a more female-biased sex ratio when ovipositing females are genetically related, and sex-ratio responses to foundress size if it differentially affects fitness gains from sons versus daughters. The mating system of the parasitoid wasp Ooencyrtus kuvanae meets assumptions of LMC. Females insert a single egg into each accessible egg of gypsy moth, Lymantria dispar, host egg masses. Wasps complete development inside host eggs and emerge en masse, as sexually mature adults, resulting in intense competition among brothers. We tested the hypothesis that O. kuvanae exhibits LMC by manipulating the number of wasp foundresses on egg masses with identical numbers of eggs. 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subjects Animal Ecology
Animal populations
Animal reproduction
Behavioral Sciences
Biological competition
Biomedical and Life Sciences
Butterflies & moths
Competition
Egg masses
Eggs
Female animals
Hymenoptera
Insect eggs
Insects
Larvae
Life Sciences
Lymantria dispar
Mating behavior
Moths
Offspring
Ooencyrtus kuvanae
Original Paper
Parasitoids
Sex ratio
Siblings
Sons
Zoology
title Local mate competition in the solitary parasitoid wasp Ooencyrtus kuvanae
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