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Facultative symbionts can represent important sources of adaptation for their insect hosts and thus have the potential for rapid spread. Drosophila neotestacea harbours 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...
Maternally transmitted symbionts persist over macroevolutionary timescales by undergoing occasional lateral transfer to new host species. To invade a new species, a symbiont must survive and reproduce in the new host, undergo maternal transmission, and confer a selective benefit sufficient to overcome losses due to imperfect maternal transmission. Drosophila neotestacea is naturally infected with...
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