Sex ratio dynamics ofGonatocerus ashmeadi, a parasitoid of the glassy-winged sharpshooter in California

Autor:	Apostolos Kapranas, John Lytle, J.M. Nichols, David J. W. Morgan, Joseph G. Morse
Rok vydání:	2012
Předmět:	biology Ecology Host (biology) Parasitism Zoology Context (language use) Hymenoptera biology.organism_classification Gonatocerus ashmeadi Parasitoid Glassy-winged sharpshooter Insect Science Ecology Evolution Behavior and Systematics Sex ratio
Zdroj:	Entomologia Experimentalis et Applicata. 145:222-227
ISSN:	0013-8703
DOI:	10.1111/eea.12013
Popis:	We examined whether Gonatocerus ashmeadi Girault (Hymenoptera: Mymaridae), a quasi-gregarious egg parasitoid of Homalodisca vitripennis (Germar) (Hemiptera: Cicadellidae), produces precise sex ratios under a field setting. Under laboratory conditions, previous studies have shown that G. ashmeadi exhibits strongly female-biased sex ratios with low variance in the number of males produced per host. Field-collected G. ashmeadi tend to produce much less female-biased sex ratios with high variance in male numbers. We found significant positive effects of proportion parasitism and host density on sex ratio. Proportion parasitism also had a positive effect on sex ratio variance. The findings of this study are discussed in the context of theoretical predictions.
Databáze:	OpenAIRE
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