| Diet Quality Can Play a Critical Role in Defense Efficacy against Parasitoids and Pathogens in the Glanville Fritillary (Melitaea cinxia). | |
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MedLine Citation:
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PMID: 22273742 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Numerous herbivorous insect species sequester noxious chemicals from host plants that effectively defend against predators, and against parasitoids and pathogens. Sequestration of these chemicals may be expensive and involve a trade off with other fitness traits. Here, we tested this hypothesis. We reared Glanville fritillary butterfly (Melitaea cinxia L.) larvae on plant diets containing low- and high-levels of iridoid glycosides (IGs) (mainly aucubin and catalpol) and tested: 1) whether IGs affect the herbivore's defense against parasitoids (measured as encapsulation rate) and bacterial pathogens (measured as herbivore survival); 2) whether parasitoid and bacterial defenses interact; and 3) whether sequestration of the plant's defense chemicals incurs any life history costs. Encapsulation rates were stronger when there were higher percentages of catalpol in the diet. Implanted individuals had greater amounts of IGs in their bodies as adults. This suggests that parasitized individuals may sequester more IGs, increase their feeding rate after parasitism, or that there is a trade off between detoxification efficiency and encapsulation rate. Larval survival after bacterial infection was influenced by diet, but probably not by diet IG content, as changes in survival did not correlate linearly with the levels of IGs in the diet. However, M. cinxia larvae with good encapsulation abilities were better defended against bacteria. We did not find any life history costs of diet IG concentration for larvae. These results suggest that the sequestering of plant defense chemicals can help herbivorous insects to defend against parasitoids. |
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Authors:
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Minna Laurentz; Joanneke H Reudler; Johanna Mappes; Ville Friman; Suvi Ikonen; Carita Lindstedt |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-1-25 |
Journal Detail:
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Title: Journal of chemical ecology Volume: - ISSN: 1573-1561 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-1-25 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7505563 Medline TA: J Chem Ecol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Centre of Excellence in Evolutionary Research, Department of Biological and Environmental Sciences, University of Jyväskylä, P.O. Box 35, FI-40014, Jyväskylä, Finland. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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