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          Institute: MPI für Evolutionsbiologie     Collection: Evolutionary ecology     Display Documents

ID: 564927.0, MPI für Evolutionsbiologie / Evolutionary ecology
Parasite diversity, patterns of MHC II variation and olfactory based mate choice in diverging three-spined stickleback ecotypes
Authors:Eizaguirre, Christophe; Lenz, Tobias L.; Sommerfeld, Ralf D.; Harrod, Chris; Kalbe, Martin; Milinski, Manfred
Date of Publication (YYYY-MM-DD):2011-05
Title of Journal:Evolutionary Ecology
Journal Abbrev.:Evol Ecol
Issue / Number:3 (Spec. iss. S 1)
Start Page:605
End Page:622
Title of Issue:Evolutionary Ecology of Fishes: Diversification, Adaptation and Speciation
Full name of Issue-Editor(s):Mehner, Thomas; Freyhof, Jörg; Reichard, Martin
Review Status:not specified
Audience:Not Specified
Abstract / Description:Ecological speciation has been the subject of intense research in evolutionary biology but the genetic basis of the actual mechanism driving reproductive isolation has rarely been identified. The extreme polymorphism of the major histocompatibility complex (MHC), probably maintained by parasite-mediated selection, has been proposed as a potential driver of population divergence. We performed an integrative field and experimental study using three-spined stickleback river and lake ecotypes. We characterized their parasite load and variation at MHC class II loci. Fish from lakes and rivers harbor contrasting parasite communities and populations possess different MHC allele pools that could be the result of a combined action of genetic drift and parasite-mediated selection. We show that individual MHC class II diversity varies among populations and is lower in river ecotypes. Our results suggest the action of homogenizing selection within habitat type and diverging selection between habitat types. Finally, reproductive isolation was suggested by experimental evidence: in a flow channel design females preferred assortatively the odor of their sympatric male. This demonstrates the role of olfactory cues in maintaining reproductive isolation between diverging fish ecotypes.
Free Keywords:habitat heterogeneity; parasite community; major histocompatibility complex; local adaptations; mate choice; parasite diversity; speciation; three-spined stickleback
External Publication Status:published
Document Type:Article
Communicated by:Brigitte Lechner
Affiliations:MPI für Evolutionsbiologie/Abt. Evolutionsökologie
External Affiliations:Leibniz Inst Marine Sci IFM GEOMAR, Duesternbrooker Weg 20, D-24105 Kiel, Germany
Identifiers:ISSN:0269-7653 (print) [ID-No:1]
ISSN:1573-8477 (online) [ID-No:2]
DOI:10.1007/s10682-010-9424-z [ID-No:3]
LOCALID:2835/S 39178 [Listen-Nummer/S-Nummer]
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