The genotype specific competitive ability does not correlate with infection in natural Daphnia magna populations

Altermatt, Florian and Ebert, Dieter. (2007) The genotype specific competitive ability does not correlate with infection in natural Daphnia magna populations. PLoS ONE, 2 (12). e1280.

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Official URL: https://edoc.unibas.ch/80861/

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Background.; Different evolutionary hypotheses predict a correlation between the fitness of a genotype in the absence of; infection and the likelihood to become infected. The cost of resistance hypothesis predicts that resistant genotypes pay a cost; of being resistant and are less fit in the absence of parasites. The inbreeding-infection hypothesis predicts that the susceptible; individuals are less fit due to inbreeding depression.; Methods and Results.; Here we tested if a host?s natural infection status; was associated with its fitness. First, we experimentally confirmed that cured but formerly infected; Daphnia magna; are; genetically more susceptible to reinfections with; Octosporeabayeri; than naturally uninfected; D.magna. We then collected; from each of 22 populations both uninfected and infected; D.magnagenotypes. All were treated against parasites and kept in; their asexual phase. We estimated their relative fitness in an experiment against a tester genotype and in another experiment; in direct competition. Consistently, we found no difference in competitive abilities between uninfected and cured but formerly; infected genotypes. This was the case both in the presence as well as in the absence of sympatric parasites during the; competition trials.; Conclusions.; Our data do not support the inbreeding-infection hypothesis. They also do not support a cost; of resistance, however ignoring other parasite strains or parasite species. We suggest as a possible explanation for our results; that resistance genes might segregate largely independently of other fitness associated genes in this system.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Evolutionary Biology (Ebert)
UniBasel Contributors:Ebert, Dieter
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Public Library of Science
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Jun 2021 10:09
Deposited On:22 Jun 2021 10:09

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