Data from: Negative frequency-dependent selection is intensified at higher population densities in protist populations

Ewan J. A. Minter, Phillip C. Watts, Chris D. Lowe & Michael A. Brockhurst
Natural populations of free-living protists often exhibit high-levels of intraspecific diversity, yet this is puzzling as classic evolutionary theory predicts dominance by genotypes with high fitness, particularly in large populations where selection is efficient. Here, we test whether negative frequency-dependent selection (NFDS) plays a role in the maintenance of diversity in the marine flagellate Oxyrrhis marina using competition experiments between multiple pairs of strains. We observed strain-specific responses to frequency and density, but an overall...
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