Variable strength of predator-mediated effects on species occurrence in an arctic terrestrial vertebrate community

Éliane Duchesne, Jean-François Lamarre, Gilles Gauthier, Dominique Berteaux, Dominique Gravel & Joël Bêty
Indirect effects resulting from species sharing the same enemy can shape spatio-temporal variations in species occurrence. The strength of such effects remains poorly known in natural communities composed of species from different trophic levels interacting in heterogeneous landscapes. Benefiting from a well-known arctic vertebrate community and marked spatio-temporal variations in the density of key prey species, we examined the effects of direct predator-prey and indirect predator-mediated effects on species occurrence in the landscape. We found...
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