Context-dependent variability in the population prevalence and individual fitness effects of plant-fungal symbiosis

Marion Donald, Teresa Bohner, Kory Kolis, Alan Shadow, Jennifer Rudgers & Tom Miller
1. Heritable symbionts, found within a diverse array of flora and fauna, are often observed at intermediate prevalence within host populations, despite expectations that positive fitness feedbacks should drive beneficial symbionts to fixation. Intermediate prevalence may reflect neutral dynamics of symbionts with weak fitness effects, transient dynamics of symbionts trending toward fixation (or elimination), or a stable intermediate outcome determined by the balance of fitness effects and failed symbiont transmission. Theory suggests these outcomes should...
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