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Does genetic diversity reduce intraspecific competition in rotifer populations?

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Abstract

As a result of reduced intraspecific competition, genetically diverse populations may have higher relative fitness than genetically uniform populations. To test this hypothesis, we compared polyclonal (i.e., genetically diverse) versus monoclonal (i.e., composed of a single clonal genotype) experimental populations of the rotifer Brachionus plicatilis (Müller, 1786) growing separately and in competition. We estimated the following fitness components: intrinsic growth rate; carrying capacity; proportion of sexual females; diapausing egg production per sexual female and total egg production. Polyclonal populations showed similar dynamics to monoclonal populations and no statistical difference between their fitness components was detected. Therefore, results do not support the hypothesis that genetically diverse populations reduce competition through diversification in resource use. Instead, results suggest that B. plicatilis is a generalist consumer whose polyphagy does not depend on genetic differences, but on the broad diet of each genotype. However, clones showed significant differences in almost all fitness components demonstrating among-clone variation in life-history traits. We found a trade-off between sexual ratio and carrying capacity, highlighting the cost of sex in cyclical parthenogenetic rotifers. We discuss the mechanisms that could maintain the observed among-clone genetic variation in natural populations, and speculate on results implication for sex maintenance in rotifers.

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Acknowledgements

The authors sincerely thank José Carmona for help building the culture containers. We also acknowledge the Institute of Chemical Technology (Universidad Politecnica de Valencia, Spain), which performed the organic carbon content analysis of the algae. Funding was provided by the Ministerio de Educación y Ciencia of Spain, grant CGL2006-07267. Nohemi Dimas-Flores was supported by a fellowship (171031) from the Consejo Nacional de Ciencia y Tecnología of Mexico.

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  1. Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València, A.O. 22085, 46071, Valencia, Spain

    Nohemi Dimas-Flores, Manuel Serra & María José Carmona

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  1. Nohemi Dimas-Flores
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  2. Manuel Serra
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  3. María José Carmona
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Correspondence to María José Carmona.

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Dimas-Flores, N., Serra, M. & Carmona, M.J. Does genetic diversity reduce intraspecific competition in rotifer populations?. Hydrobiologia 705, 43–54 (2013). https://doi.org/10.1007/s10750-012-1378-4

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