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1 July 2009 The Cost of Being Common: Evidence from Natural Daphnia Populations
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Abstract

The Red Queen coevolutionary hypothesis predicts that parasites drive oscillations in host genotype frequencies due to frequencydependent selection where common hosts are at disadvantage. However, examples of this phenomenon in natural populations are scarce. To examine if the Red Queen theory operates in the wild, we studied the genetic structure of populations of the crustacean waterflea (Daphnia), in relation to their infection levels, for which we collected multiple samples from a variety of lakes. The most common clone in a given population was often underinfected. This advantage, however, did not remain stable over time. Instead, the most common clone decreased in frequency over subsequent generations, indicating that parasites can track common clones. Such decreases were not observed in uninfected populations. Moreover, host clonal evenness was higher across the set of infected lakes compared to uninfected lakes; suggesting that any common clone is selected against when parasites are present. These results strongly suggest that Red Queen dynamics do operate in the wild.

© 2009 The Society for the Study of Evolution.
Justyna Wolinska and Piet Spaak "The Cost of Being Common: Evidence from Natural Daphnia Populations," Evolution 63(7), 1893-1901, (1 July 2009). https://doi.org/10.1111/j.1558-5646.2009.00663.x
Received: 4 June 2008; Accepted: 1 January 2009; Published: 1 July 2009
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