Abstract
Small mammal populations often exhibit large-scale spatial synchrony, which is purportedly caused by stochastic weather-related environmental perturbations, predation or dispersal. To elucidate the relative synchronizing effects of environmental perturbations from those of dispersal movements of small mammalian prey or their predators, we investigated the spatial dynamics of Microtus vole populations in two differently structured landscapes which experience similar patterns of weather and climatic conditions. Vole and predator abundances were monitored for three years on 28 agricultural field sites arranged into two 120-km-long transect lines in western Finland. Sites on one transect were interconnected by continuous agricultural farmland (continuous landscape), while sites on the other were isolated from one another to a varying degree by mainly forests (fragmented landscape). Vole populations exhibited large-scale (>120 km) spatial synchrony in fluctuations, which did not differ in degree between the landscapes or decline with increasing distance between trapping sites. However, spatial variation in vole population growth rates was higher in the fragmented than in the continuous landscape. Although vole-eating predators were more numerous in the continuous agricultural landscape than in the fragmented, our results suggest that predators do not exert a great influence on the degree of spatial synchrony of vole population fluctuations, but they may contribute to bringing out-of-phase prey patches towards a regional density level. The spatial dynamics of vole populations were similar in both fragmented and continuous landscapes despite inter-landscape differences in both predator abundance and possibilities of vole dispersal. This implies that the primary source of synchronization lies in a common weather-related environment.
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Acknowledgments
We wish to thank Lauri Nikkinen for trapping assistance and Narssjön Camping, the Kauhajoki Hunting Society and family Ikola for accommodation during trapping visits. The study was financially supported by the Academy of Finland (grants no. 106036 to OH, 111195 to TK and 206140 to EK), the Graduate School in Evolutionary Ecology (grant to OH) and the Turku University Foundation (grant to OH). All aspects of this study comply with the current laws of Finland.
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Communicated by Hannu Ylönen.
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Huitu, O., Laaksonen, J., Klemola, T. et al. Spatial dynamics of Microtus vole populations in continuous and fragmented agricultural landscapes. Oecologia 155, 53–61 (2008). https://doi.org/10.1007/s00442-007-0885-x
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DOI: https://doi.org/10.1007/s00442-007-0885-x