Role of predation in short-term population fluctuations of some birds and mammals in Fennoscandia

Publication Type:Journal Article
Year of Publication:1984
Authors:Angelstam, P, Lindstrom, E, Widen, P
Journal:Oecologia
Volume:62
Date Published:1984
Keywords:Vulpes vulpes
Abstract:

The main prey of Fennoscandian predators are the cyclically superabundant voles. Small game species (alternative prey) are rare compared to voles. The following 4 predictions were tested: 1) Predators should shift their diet from main prey to alternative prey as main prey decline. This was confirmed using data on red fox Vulpes vulpes diet; 2) The mortality rate of alternative prey should be inversely correlated to the abundance of main prey. This was true for mountain hare Lepus timidus mortality rates and the rate of nest predation on black grouse Tetrao tetrix; 3) The total consumption of prey by all the predators should at least equal the critical losses in alternative prey during a decline year. A tentative estimate of predator consumption amounted to 10 times the losses in grouse and hare; and 4) The absence of synchrony between the species in the boreonemoral region should be associated with a more diverse diet of predators. This was the case for red fox diets throughout Sweden.

Taxonomic name: 
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