Send to

Choose Destination
Evolution. 2009 Jul;63(7):1893-901. doi: 10.1111/j.1558-5646.2009.00663.x. Epub 2009 Feb 18.

The cost of being common: evidence from natural Daphnia populations.

Author information

Indiana University, Department of Biology, Bloomington, Indiana 47405, USA.


The Red Queen coevolutionary hypothesis predicts that parasites drive oscillations in host genotype frequencies due to frequency-dependent 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.

[Indexed for MEDLINE]

Supplemental Content

Loading ...
Support Center