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Spatio-temporal ranging behaviour and its relevance to foraging strategies in wide-ranging wolverines

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  • May, Roel
  • van Dijk, Jiska
  • Landa, Arild
  • Andersen, Roy
  • Andersen, Reidar

Abstract

Conservation of carnivores in an increasingly changing environment is greatly helped by understanding the decision-making processes underlying habitat patch choice. Foraging theory may give us insight into spatio-temporal search patterns and consequent foraging decisions that carnivores make in heterogeneous and fluctuating environments. Constraints placed on central-place foragers in particular are likely to influence both foraging decisions and related spatio-temporal movement patterns. We used discrete choice models to investigate the spatio-temporal ranging behaviour of GPS collared female wolverines (Gulo gulo) with dependent cubs in south-central Norway. Activity patterns, home range use and selection for elevation were analyzed in relation to spatial and temporal covariates (daily and seasonal) and related to different foraging behaviours. In spring, wolverines showed restricted movement patterns around rendezvous sites at high elevations by day, whereas during the night animals were active at lower elevations. Over the summer, this daily pattern in intensity of use diminished and their overall selectiveness for elevation decreased as cubs grow more mobile and independent. At the onset of autumn, wolverines showed intensive use of the profitable forest-alpine tundra ecotone. We argue that reproducing wolverines deployed a foraging strategy attuned to altering their movement patterns throughout the summer to address a continuous, but diminishing, trade-off between providing both food and shelter for their offspring. Incorporating spatially and temporally explicit activity patterns and home range use in discrete choice resource selection models thus enhances the understanding of the motives behind wolverine resource utilization in space and time. Such knowledge may provide guidance to managers designing regional-scale zoning, in order to facilitate carnivore recovery and to minimize conflicts with human activities.

Suggested Citation

  • May, Roel & van Dijk, Jiska & Landa, Arild & Andersen, Roy & Andersen, Reidar, 2010. "Spatio-temporal ranging behaviour and its relevance to foraging strategies in wide-ranging wolverines," Ecological Modelling, Elsevier, vol. 221(6), pages 936-943.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:6:p:936-943
    DOI: 10.1016/j.ecolmodel.2009.12.024
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    References listed on IDEAS

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    1. Chen Z. & Kuo L., 2001. "A Note on the Estimation of the Multinomial Logit Model With Random Effects," The American Statistician, American Statistical Association, vol. 55, pages 89-95, May.
    2. Olsson, Ola & Brown, Joel S. & Helf, Kurt L., 2008. "A guide to central place effects in foraging," Theoretical Population Biology, Elsevier, vol. 74(1), pages 22-33.
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    1. Ronaldo G Morato & Jared A Stabach & Chris H Fleming & Justin M Calabrese & Rogério C De Paula & Kátia M P M Ferraz & Daniel L Z Kantek & Selma S Miyazaki & Thadeu D C Pereira & Gediendson R Araujo & , 2016. "Space Use and Movement of a Neotropical Top Predator: The Endangered Jaguar," PLOS ONE, Public Library of Science, vol. 11(12), pages 1-17, December.

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