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Host species critical for offspring fitness and sex ratio for an oligophagous parasitoid: implications for host coexistence
Stockholm University, Faculty of Science, Department of Botany.
2010 (English)In: Bulletin of entomological research, ISSN 0007-4853, E-ISSN 1475-2670, Vol. 100, no 6, 735-740 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2010. Vol. 100, no 6, 735-740 p.
Keyword [en]
clutch size, life history, parasitism, Skeppsvik, Galerucella tenella, Galerucella calmariensis, Asecodes mento
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-51436DOI: 10.1017/S0007485310000143ISI: 000284012200012OAI: oai:DiVA.org:su-51436DiVA: diva2:385688
Note
authorCount :2Available from: 2011-01-12 Created: 2011-01-10 Last updated: 2017-12-11Bibliographically approved

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