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Conspecific interference by adults in an aphidophagous ladybird Propylea dissecta (Coleoptera: Coccinellidae): effect on reproduction

Published online by Cambridge University Press:  09 March 2007

G. Mishra  and
Omkar
G. Mishra
Affiliation:
Ladybird Research Laboratory, Department of Zoology, University of Lucknow, Lucknow 226 007, India
Omkar*
Affiliation:
Ladybird Research Laboratory, Department of Zoology, University of Lucknow, Lucknow 226 007, India
*
*E-mail: omkar55@hotmail.com
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Abstract

The effects of conspecific adult interference on the reproductive output of an aphidophagous ladybird, Propylea dissecta (Mulsant) were investigated. Ovipositing females were subjected to physical interference with conspecific adults (0 to 4 males or females) in Petri dishes and the effects on egg cannibalism, oviposition and egg viability were recorded. The absence of interference was related to the lowest egg cannibalism (0.00%) and higher fecundity (336.30±32.16 eggs) and egg viability (95.83±1.60%). Fecundity decreased with increasing physical interference from either sex. Egg viability declined with increasing male density, but was not influenced by conspecific females. In a second experiment, evaluating the role of conspecific adult chemical tracks on fecundity and egg viability, it was observed that adult chemical track density (fresh and ten-day-old) was negatively correlated. Egg viability was not affected by the presence of adult chemical tracks. The decrease in fecundity was not affected by the sex of the adults making the tracks, thus revealing that the chemical constitution of these deterrent compounds was not sex-specific. Conspecific interference in a Petri dish reduces reproductive output, as a result of physical interference and response to what seem to be oviposition-deterring pheromones present in adult tracks.

Keywords

coccinellidphysical interferencechemical interferencereproductionPropylea dissectaoviposition-deterring pheromonessemiochemicals
Type
Research Article
Information
Bulletin of Entomological Research , Volume 96 , Issue 4 , August 2006 , pp. 407 - 412
Copyright
Copyright © Cambridge University Press 2006

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