Predation of boreal owl nests by pine martens in the boreal forest does not vary as predicted by the alternative prey hypothesis.

In this model, the effect of cavity age was highly significant and the effect of distance to forest edge marginally non-significant, while the effect of microtine abundance was not significant (Table 1 d).

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In this model, the effect of cavity age was highly significant, and the probability of nest predation increased with increasing cavity age (Table 1 a).

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