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Host species critical for offspring fitness and sex ratio for an oligophagous parasitoid: implications for host coexistence

Published online by Cambridge University Press:  14 July 2010

J.A. Stenberg  and
P.A. Hambäck
J.A. Stenberg*
Affiliation:
Department of Ecology, Swedish University of Agricultural Sciences, Box 7044, SE-750 07Uppsala, Sweden
P.A. Hambäck
Affiliation:
Department of Botany, Stockholm University, SE-106 91Stockholm, Sweden
*
*Author for correspondence Fax: +46-18672890 E-mail: johan.stenberg@ekol.slu.se
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Abstract

In theory, inferior apparent competitors sharing a natural enemy with superior apparent competitors should be excluded in the absence of stabilising factors. Nevertheless, plentiful examples of coexisting apparent competitors exist. In this paper, we show that parasitoid resource competition within hosts affects both parasitoid sex ratio and female body size, with implication for population growth and apparent competition between the two closely related hosts experiencing a strong asymmetry in their interaction. While the superior competitor delivers parasitoids with higher fitness to the shared parasitoid pool, the inferior competitor delivers a higher proportion of female parasitoids. Hence, the inferior host experience an inflow of fit parasitoids from the superior competitor, which should increase the risk of exclusion, but also an outflow of parasitoid females, which should reduce the risk of exclusion and increase stability. We conclude that differential outcomes of parasitoid resource competition in different host species may have profound effects on shared parasitoid populations and should be included in future studies of apparent competition between hosts.

Keywords

clutch sizelife historyparasitismSkeppsvikGalerucella tenellaGalerucella calmariensisAsecodes mento
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 6 , December 2010 , pp. 735 - 740
Copyright
Copyright © Cambridge University Press 2010

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