Data from: Dynamics of the continent-wide spread of a Drosophila defensive symbiont

Sarah N. Cockburn, Tamara S. Haselkorn, Phineas T. Hamilton, Elizabeth Landzberg, John Jaenike & Steve J. Perlman
Facultative symbionts can represent important sources of adaptation for their insect hosts and thus have the potential for rapid spread. Drosophila neotestacea harbors a heritable symbiont, Spiroplasma, that confers protection against parasitic nematodes. We previously found a cline in Spiroplasma prevalence across central Canada, ending abruptly at the Rocky Mountains. Resampling these populations nine years later revealed that Spiroplasma had increased substantially across the region, resembling a Fisherian wave of advance. Associations between Spiroplasma infection...
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