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Research article - Peer-reviewed, 2016

Intensity of space use reveals conditional sex-specific effects of prey and conspecific density on home range size

Aronsson, Malin; Low, Matthew; López-Bao, José Vicente; Persson, Jens; Odden, John; Linnell, John; Andren, Henrik

Abstract

Home range (HR) size variation is often linked to resource abundance, with sex differences expected to relate to sex-specific fitness consequences. However, studies generally fail to disentangle the effects of the two main drivers of HR size variation, food and conspecific density, and rarely consider how their relative influence change over spatiotemporal scales. We used location data from 77 Eurasian lynx (Lynx lynx) from a 16-year Scandinavian study to examine HR sizes variation relative to prey and conspecific density at different spatiotemporal scales. By varying the isopleth parameter (intensity of use) defining the HR, we show that sex-specific effects were conditional on the spatial scale considered. Males had larger HRs than females in all seasons. Females' total HR size declined as prey and conspecific density increased, whereas males' total HR was only affected by conspecific density. However, as the intensity of use within the HR increased (from 90% to 50% isopleth), the relationship between prey density and area showed opposing patterns for females and males; for females, the prey density effect was reduced, while for males, prey became increasingly important. Thus, prey influenced the size of key regions within male HRs, despite total HR size being independent of prey density. Males reduced their HR size during the mating season, likely to remain close to individual females in estrous. Females reduced their HR size postreproduction probably because of movement constrains imposed by dependent young. Our findings highlight the importance of simultaneously considering resources and intraspecific interactions as HR size determinants. We show that sex-specific demands influence the importance of prey and conspecific density on space use at different spatiotemporal scales. Thus, unless a gradient of space use intensity is examined, factors not related to total HR size might be disregarded despite their importance in determining size of key regions within the HR.

Keywords

Capreolus capreolus; carnivore; kernel home range estimator; ranging behavior; spatiotemporal variation; utilization distribution

Published in

Ecology and Evolution
2016, volume: 6, number: 9, pages: 2957-2967
Publisher: WILEY-BLACKWELL

Authors' information

Swedish University of Agricultural Sciences, Department of Ecology
Swedish University of Agricultural Sciences, Department of Ecology
López-Bao, José Vicente
University of Oviedo
Swedish University of Agricultural Sciences, Department of Ecology
Odden, John
Norwegian Institute for Nature Research (NINA)
Linnell, John
Norwegian Institute for Nature Research (NINA)
Swedish University of Agricultural Sciences, Department of Ecology

UKÄ Subject classification

Zoology
Evolutionary Biology
Ecology

Publication Identifiers

DOI: https://doi.org/10.1002/ece3.2032

URI (permanent link to this page)

https://res.slu.se/id/publ/78324