Abstract
The relationship between predators and prey is thought to change due to habitat loss and fragmentation, but patterns regarding the direction of the effect are lacking. The common prediction is that specialized predators, often more dependent on a certain habitat type, should be more vulnerable to habitat loss compared to generalist predators, but actual fragmentation effects are unknown. If a predator is small and vulnerable to predation by other larger predators through intra-guild predation, habitat fragmentation will similarly affect both the prey and the small predator. In this case, the predator is predicted to behave similarly to the prey and avoid open and risky areas. We studied a specialist predator’s, the least weasel, Mustela nivalis nivalis, spacing behavior and hunting efficiency on bank voles, Myodes glareolus, in an experimentally fragmented habitat. The habitat consisted of either one large habitat patch (non-fragmented) or four small habitat patches (fragmented) with the same total area. The study was replicated in summer and autumn during a year with high avian predation risk for both voles and weasels. As predicted, weasels under radio-surveillance killed more voles in the non-fragmented habitat which also provided cover from avian predators during their prey search. However, this was only during autumn, when the killing rate was also generally high due to cold weather. The movement areas were the same for both sexes and both fragmentation treatments, but weasels of both sexes were more prone to take risks in crossing the open matrix in the fragmented treatment. Our results support the hypothesis that habitat fragmentation may increase the persistence of specialist predator and prey populations if predators are limited in the same habitat as their prey and they share the same risk from avian predation.
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Acknowledgments
We thank all the helpers in the field during radio-tracking, Nelika Hughes, Hanne Vihervaara, Janika Aaltonen, Audrey Proust, Netta Seppälä, Sirke Piirainen and Lenka Trebaticka. We thank technicians of the Konnevesi Research Station for maintenance of the enclosures. John Loehr commented manuscript and corrected the language. The study was supported by the Finnish Academy to the CoE in Evolutionary Ecology at University of Jyväskylä. The authors declare that there is no conflict of interest. Experiment and animal handling was conducted with animal experimentation permission at Jyväskylä University no. 35/31.5.2004.
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Communicated by Roland Brandl.
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Haapakoski, M., Sundell, J. & Ylönen, H. Mammalian predator–prey interaction in a fragmented landscape: weasels and voles. Oecologia 173, 1227–1235 (2013). https://doi.org/10.1007/s00442-013-2691-y
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DOI: https://doi.org/10.1007/s00442-013-2691-y