Are gastrointestinal parasites associated with the cyclic population dynamics of their arctic lemming hosts?

Although the interaction between year and site was highly significant in the GLM (Dev (df=8, 302) : 39.10, p-value < 0.001), eimerian faecal prevalence varied among years (Dev (df=4, 310) : 18.81, p-value < 0.001) but not among sites (Dev (df=2,314) : 0.86, p-value = 0.62), suggesting asynchronous variations of eimerian faecal prevalence among sites ( Fig. 2 ).

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Association between eimerians and lemming density was, however, clearly significant at one study site (Hochstetter; Fig. 3 ), where eimerian faecal prevalence ( P t ) was high at low lemming densities ( N t < 2 ind./ha) and where a delayed relationship was found between P t and N t+1 .

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