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The enemy hypothesis: correlates of gall morphology with parasitoid attack rates in two closely related rose cynipid galls

Published online by Cambridge University Press:  07 December 2012

Z. László  and
B. Tóthmérész
Z. László*
Affiliation:
Hungarian Department of Biology and Ecology, Babeş-Bolyai University, Str. Clinicilor nr. 5–7, 400006 Cluj-Napoca, Romania
B. Tóthmérész
Affiliation:
Ecological Department, University of Debrecen, P. O. Box 71, 4010 Debrecen, Hungary
*
* Author for correspondence E-mail: [email protected]
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Abstract

We tested the enemy hypothesis for gall morphology on a model system comprising two Diplolepis rose gall wasp species and their associated parasitoids. The enemy hypothesis predicts both that gall traits will influence parasitoid attack rates within species, and that galls with contrasting morphologies will support different parasitoid communities. This hypothesis is supported by studies at both intraspecific and broader taxonomic levels (i.e. between genera), but patterns remain to be explored in closely related species. Our aims were to explore the relationships between aspects of gall morphology (number of larval chambers, overall gall size and thickness of the gall wall) in each of Diplolepis mayri and D. rosae, and to explore correlations between these traits and both the presence/absence (=incidence) and attack rates imposed by parasitoids. We found in both galls that chamber number is positively correlated with gall size. In galls of D. mayri, parasitoid incidence was negatively correlated with thickness of the wall of the larval chamber, but there was no significant correlation between parasitoid attack rates and overall gall size. In D. rosae galls, parasitoid incidence was positively correlated with chamber wall thickness, but parasitoid attack rates were negatively correlated with gall size, suggesting that selection may favour the induction of galls containing more larval chambers. These results confirm that gall extended phenotypes can significantly influence enemy attack rates, consistent with the ‘enemy hypothesis’. Further, differences in gall morphology between the two Diplolepis species may underlie differences in their associated parasitoid communities – further research is required to test this hypothesis.

Keywords

differential adaptationDiplolepisgall morphologyparasitoid attack probabilityparasitoid attack rate
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 103 , Issue 3 , June 2013 , pp. 326 - 335
Copyright
Copyright © Cambridge University Press 2012

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