A common multi-host parasite shows genetic structuring at the host species and population levels.

Partial Mantel tests controlling for the effect of time between sampling dates gave similar impacts of same vs different lake ( r = 0.372, P = 0.001) and same vs different host species ( r = 0.248, P = 0.001) on Prevosti distances. Our first AMOVA indicated marginally significant differences between P. ramosa genotypes in different lakes (variation explained = 11.9%, P = 0.085; Table 4 ), significant differences between genotypes infecting different host species within lakes (variation explained = 24.0%, P = 0.025; Table 4 ), and significant differences in P. ramosa genetic structure over time during outbreaks (variation explained = 15.2%, P = 0.002; Table 4 ).

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