Abstract:
: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 signature of NFDS that was intensified at higher population densities. Because our strains were not selected a priori on the basis of particular traits expected to exhibit NFDS, these data represent a relatively unbiased estimate of the role for NFDS in maintaining diversity in protist populations. These findings could help to explain how bloom-forming plankton, which periodically achieve exceptionally high population densities, maintain substantial intraspecific diversity.
journal_name
Biol Lettjournal_title
Biology lettersauthors
Minter EJ,Watts PC,Lowe CD,Brockhurst MAdoi
10.1098/rsbl.2015.0192subject
Has Abstractpub_date
2015-06-01 00:00:00pages
20150192issue
6eissn
1744-9561issn
1744-957Xpii
rsbl.2015.0192journal_volume
11pub_type
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