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          Institute: MPI für Evolutionsbiologie     Collection: Evolutionary ecology     Display Documents



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ID: 429341.0, MPI für Evolutionsbiologie / Evolutionary ecology
Differences in parasite susceptibility and costs of resistance between naturally exposed and unexposed host populations
Authors:Hasu, T.; Benesh, D. P.; Valtonen, E. T.
Language:English
Date of Publication (YYYY-MM-DD):2009-04
Title of Journal:Journal of Evolutionary Biology
Journal Abbrev.:J. Evol. Biol.
Volume:22
Issue / Number:4
Start Page:699
End Page:707
Review Status:not specified
Audience:Not Specified
Abstract / Description:It is generally assumed that resistance to parasitism entails costs. Consequently, hosts evolving in the absence of parasites are predicted to invest less in costly resistance mechanisms than hosts consistently exposed to parasites. This prediction has, however, rarely been tested in natural populations. We studied the susceptibility of three naive, three parasitized and one recently isolated Asellus aquaticus isopod populations to an acanthocephalan parasite. We found that parasitized populations, with the exception of the isopod population sympatric with the parasite strain used, were less susceptible to the parasite than the naive populations. Exposed but uninfected (resistant) isopods from naive populations, but not from parasitized populations, exhibited greater mortality than controls, implying that resistance entails survival costs primarily for naive isopods. These results suggest that parasites can drive the evolution of host resistance in the wild, and that co-existence with parasites may increase the cost-effectiveness of defence mechanisms.
Free Keywords:Acanthocephala; Acanthocephalus lucii; evolution of resistance; host-parasite interaction; local adaptation; naive host; parasite-mediated selection
External Publication Status:published
Document Type:Article
Affiliations:MPI für Evolutionsbiologie/Abt. Evolutionsökologie
External Affiliations:Univ Jyväskylä, Dept Biol & Environm Sci, Jyväskylä, Finland
Identifiers:ISSN:1010-061X (print) [ID-No:1]
ISSN:1420-9101 (online) [ID-No:2]
DOI:10.1111/j.1420-9101.2009.01704.x [ID-No:3]
LOCALID:2686/S 38982 [Listen-Nummer/S-Nummer]
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