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Host specialization of parasitoids and their hyperparasitoids on a pair of syntopic aphid species

Published online by Cambridge University Press:  13 March 2013

Sämi Schär  and
Christoph Vorburger
Sämi Schär*
Affiliation:
Institute of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
Christoph Vorburger
Affiliation:
Institute of Integrative Biology, ETH Zürich, Switzerland EAWAG, Swiss Federal Institute of Aquatic Science and Technology, Überlandstrasse 133, 8600 Dübendorf, Switzerland
*
*Author for correspondence Phone: +45 353-21238 Fax: +45 353-21250 E-mail: SSchar@bio.ku.dk, saemi.schaer@gmail.com
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Abstract

Parasitoids of herbivorous insects have frequently evolved specialized lineages exploiting hosts occurring on different plants. This study investigated whether host specialization is also observed when closely related parasitoids exploit herbivorous hosts sharing the same host plant. The question was addressed in economically relevant aphid parasitoids of the Lysiphlebus fabarum group. They exploit two aphid species (Aphis fabae cirsiiacanthoides and Brachycaudus cardui), co-occurring in mixed colonies (syntopy) on the spear thistle (Cirsium vulgare). Two morphologically distinguishable parasitoid lineages of the genus Lysiphlebus were observed and each showed virtually perfect host specialization on one of the two aphid species in this system. From A. f. cirsiiacanthoides, only females emerged that morphologically belonged to Lysiphlebus cardui, while males and females belonging to L. fabarum hatched from B. cardui. Microsatellite analyses indicated clear genetic differentiation of L. fabarum and L. cardui. L. cardui comprised only two distinct asexual lineages, one of which predominated throughout the area investigated. Population genetic analysis of sexual L. fabarum showed evidence for relatively strong spatial structuring and limited dispersal ability. Hyperparasitoids emerged from a large proportion of aphid mummies. One species, Pachyneuron aphidis, was significantly associated with B. cardui/L. fabarum mummies, indicating that host specialization may even extend to the trophic level above parasitoids.

Keywords

host specializationhost associated genetic differentiationHADlocal adaptationhyperparasitismdispersalLysiphlebusAphisBrachycaudusCirsium
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 103 , Issue 5 , October 2013 , pp. 530 - 537
Copyright
Copyright © Cambridge University Press 2013 

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