Abstract
The landscape ecology of predation is well studied and known to be influenced by habitat heterogeneity. Little attention has been given to how the influence of habitat heterogeneity on the landscape ecology of predation might be modulated by life history dynamics of prey in mammalian systems. We demonstrate how life history dynamics of moose (Alces alces) contribute to landscape patterns in predation by wolves (Canis lupus) in Isle Royale National Park, Lake Superior, USA. We use pattern analysis and kernel density estimates of moose kill sites to demonstrate that moose in senescent condition and moose in prime condition tend to be wolf-killed in different regions of Isle Royale in winter. Predation on senescent moose was clustered in one kill zone in the northeast portion of the island, whereas predation on prime moose was clustered in 13 separate kill zones distributed throughout the full extent of the island. Moreover, the probability of kill occurrence for senescent moose, in comparison to prime moose, increased in high elevation habitat with patches of dense coniferous trees. These differences can be attributed, at least in part, to senescent moose being more vulnerable to predation and making different risk-sensitive habitat decisions than prime moose. Landscape patterns emerging from prey life history dynamics and habitat heterogeneity have been observed in the predation ecology of fish and insects, but this is the first mammalian system for which such observations have been made.
Highlights
Spatial variation in predation pressure is a fundamental feature of predation ecology
Spatial clustering in these data, for senescent moose, validated the use of kernel density estimates (KDE) to higher than what would be expected if kills were distributed randomly throughout the island (x2 = 17.19, P = 3.3961025)
We documented landscape patterns of predation, for wolfkilled moose, that were modulated by prey life history stage
Summary
Spatial variation in predation pressure is a fundamental feature of predation ecology. Landscape patterns of predation are attributable to complex prey life histories [9],[10]. Within mammalian systems predators are often depicted as causal agents influencing spatial patterns regulating prey abundance and mediating herbivory [5],[12,13,14]. These material exchanges between predators, prey, and the landscape have important implications for prey population stability, trophic dynamics, and ecosystem function [15,16,17,18]. Given that life history stages are not so pronounced in mammals, they would seem not to have an important influence on landscape patterns in predation
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