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Chemical communication and host search in Galerucella leaf beetles
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
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2015 (English)In: Chemoecology, ISSN 0937-7409, E-ISSN 1423-0445, Vol. 25, no 1, 33-45 p.Article in journal (Refereed) Published
Description
Abstract [en]

Herbivore insects use a variety of search cues during host finding and mate recognition, including visual, gustatory, and olfactory stimuli, leaving multiple traits for evolution to act upon. However, information about differences or similarities in search pattern amongst closely related insect herbivore species is still scarce. Here, we study the production of and the response to pheromone in Galerucella (Coleoptera: Chrysomelidae) to investigate the beetles' search behaviour. Males of G. pusilla and G. calmariensis, two closely related species, are known to produce the aggregation pheromone dimethylfuran-lactone when feeding on their host plant, whereas no pheromones have been identified in other Galerucella species. We show that dimethylfuran-lactone is produced also by males of G. tenella, a species phylogenetically close to G. pusilla and G. calmariensis, whereas the more distantly related species G. lineola and G. sagittariae were not found to produce the same compound. To investigate the beetles' behavioural response to dimethylfuran-lactone, the pheromone was synthesized using a partly novel method and tested in olfactometers, showing that G. pusilla, G. calmariensis, and G. tenella were all attracted to the pheromone, whereas G. lineola and G. sagittariae did not respond. This suggests that the production of and the response to pheromone could be linked to the phylogenetic relatedness between the species.

Place, publisher, year, edition, pages
2015. Vol. 25, no 1, 33-45 p.
Keyword [en]
Pheromone, Volatiles, Plant-herbivore interactions, Olfactometer
National Category
Biological Sciences Earth and Related Environmental Sciences
Research subject
Plant Ecology
Identifiers
URN: urn:nbn:se:su:diva-114227DOI: 10.1007/s00049-014-0174-1ISI: 000348147000004OAI: oai:DiVA.org:su-114227DiVA: diva2:796520
Note

AuthorCount:7;

Available from: 2015-03-19 Created: 2015-02-25 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Ecology and evolution in a host-parasitoid system: Host search, immune responses and parasitoid virulence
Open this publication in new window or tab >>Ecology and evolution in a host-parasitoid system: Host search, immune responses and parasitoid virulence
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In host-parasitoid systems, there is a continuous coevolutionary arms race where each species imposes a strong selection pressure on the other. The host needs to develop defence strategies in order to escape parasitism and the parasitoid must evolve counter-defence strategies in order to overcome the host’s immune defence and successfully reproduce. This makes host-parasitoid systems excellent model systems for understanding evolutionary processes underlying host race formation and speciation. In order to gain a better understanding of the complexity of host-parasitoid interactions several aspects must be considered, such as search behaviour and host selection in the parasitoid, the development of immune responses in the host and counter-defence strategies in the parasitoid. In this thesis, I investigate interactions and coevolution in a natural host-parasitoid system, consisting of five species of Galerucella leaf beetles and three species of Asecodes parasitoids, by combining behavioural ecology with chemical ecology and immunology. In the studies performed, I found that pheromone production and responses in the beetles are connected to the phylogenetic relatedness between the Galerucella species (Paper I). I found no evidence that Asecodes exploits the adult pheromone to locate host larvae, but observed an ability in the parasitoids to distinguish a better host from a less suitable one based on larval odors (Paper II). The studies also revealed large differences in immune competence between the Galerucella species, which were linked to differences in hemocyte composition in the beetle larvae (Paper III, IV). Further, the results suggest that parasitism success in polyphagous Asecodes is strongly affected by former host species of the parasitoid (Paper IV). In conclusion, the results of this thesis suggest an on-going evolution in both parasitoid virulence and host immune responses in the Asecodes-Galerucella system.

Place, publisher, year, edition, pages
Stockholm: Department of Ecology, Environment and Plant Sciences, Stockholm University, 2015. 44 p.
Keyword
Host-parasitoid interactions, Plant-herbivore interactions, Host search, Volatiles, Pheromones, Geographic variation, Cellular defence, Melanisation, Encapsulation, Asecodes, Galerucella
National Category
Ecology Immunology
Research subject
Plant Ecology
Identifiers
urn:nbn:se:su:diva-115243 (URN)978-91-7649-103-4 (ISBN)
Public defence
2015-05-08, föreläsningssalen, Institutionen för ekologi, miljö och botanik, Lilla Frescativägen 5, Stockholm, 10:00 (English)
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Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 4: Manuscript.

Available from: 2015-04-16 Created: 2015-03-18 Last updated: 2015-04-17Bibliographically approved

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