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

<h4>Background</h4>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 f...

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Autores principales:	Florian Altermatt, Dieter Ebert
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2007
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/dd93c062af5a4e7d9139059a13b031d3
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spelling	oai:doaj.org-article:dd93c062af5a4e7d9139059a13b031d32021-11-25T06:13:43ZThe genotype specific competitive ability does not correlate with infection in natural Daphnia magna populations.1932-620310.1371/journal.pone.0001280https://doaj.org/article/dd93c062af5a4e7d9139059a13b031d32007-12-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0001280https://doaj.org/toc/1932-6203<h4>Background</h4>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.<h4>Methods and results</h4>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 Octosporea bayeri than naturally uninfected D. magna. We then collected from each of 22 populations both uninfected and infected D. magna genotypes. 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.<h4>Conclusions</h4>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.Florian AltermattDieter EbertPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 2, Iss 12, p e1280 (2007)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Florian Altermatt Dieter Ebert The genotype specific competitive ability does not correlate with infection in natural Daphnia magna populations.
description	<h4>Background</h4>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.<h4>Methods and results</h4>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 Octosporea bayeri than naturally uninfected D. magna. We then collected from each of 22 populations both uninfected and infected D. magna genotypes. 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.<h4>Conclusions</h4>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.
format	article
author	Florian Altermatt Dieter Ebert
author_facet	Florian Altermatt Dieter Ebert
author_sort	Florian Altermatt
title	The genotype specific competitive ability does not correlate with infection in natural Daphnia magna populations.
title_short	The genotype specific competitive ability does not correlate with infection in natural Daphnia magna populations.
title_full	The genotype specific competitive ability does not correlate with infection in natural Daphnia magna populations.
title_fullStr	The genotype specific competitive ability does not correlate with infection in natural Daphnia magna populations.
title_full_unstemmed	The genotype specific competitive ability does not correlate with infection in natural Daphnia magna populations.
title_sort	genotype specific competitive ability does not correlate with infection in natural daphnia magna populations.
publisher	Public Library of Science (PLoS)
publishDate	2007
url	https://doaj.org/article/dd93c062af5a4e7d9139059a13b031d3
work_keys_str_mv	AT florianaltermatt thegenotypespecificcompetitiveabilitydoesnotcorrelatewithinfectioninnaturaldaphniamagnapopulations AT dieterebert thegenotypespecificcompetitiveabilitydoesnotcorrelatewithinfectioninnaturaldaphniamagnapopulations AT florianaltermatt genotypespecificcompetitiveabilitydoesnotcorrelatewithinfectioninnaturaldaphniamagnapopulations AT dieterebert genotypespecificcompetitiveabilitydoesnotcorrelatewithinfectioninnaturaldaphniamagnapopulations
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The genotype specific competitive ability does not correlate with infection in natural Daphnia magna populations.

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