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Vole preference of bilberry along gradients of simulated moose density and site productivity

Integrative Zoology 2011年第4期6卷 341-351页

作者： simen pedersen Harry P.ANDREASSEN Inga-Lill PERSSON Riitta JULKUNEN-TIITTO Kjell DANELL Christina SKARPE Department of Forestry and Wildlife Management Hedmark University CollegeKoppangNorway Department of Biology Norwegian University of Science and TechnologyTrondheimNorway Department of Wildlife Fish and Environmental StudiesSwedish University of Agricultural SciencesUmeåSweden Department of Biology University of Eastern FinlandJoensuuFinland

Browsing by large herbivores might either increase or decrease preference for the plant by other herbivores,depending on the plant *** a cafeteria test,we studied the preference by root voles(Microtus oeconomus[Pallas,1776])for bilberry(Vaccinium myrtillus L.)previously subjected to 4 levels of simulated moose(Alces alces[Linnaeus,1758])*** different levels of moose density were simulated at population densities relevant for Fennoscandian conditions,in exclosures situated along a site productivity *** expected:(i)voles to prefer bilberry from high productivity sites over low productivity sites;(ii)voles to prefer browsed bilberry,if plants allocate resources to compensatory growth or to avoid browsed bilberry if plants allocate resources to defense;(iii)these effects to increase with increasing simulated moose density;and(iv)the concentration of plant chemicals and the plant morphology to explain vole ***,we predicted that voles would prefer:(i)plants with high nitrogen content;(ii)plants with low content of defensive substances;and(iii)tall plants with long *** preferred bilberry from the high productivity sites compared to the low productivity *** also found an interaction between site productivity and simulated moose density,where voles preferred unbrowsed plants at low productivity sites and intermediate levels of browsing at high productivity *** was no effect of plant chemistry or morphology on vole *** conclude that moose browsing impacts the food preference of *** the current high densities of moose in Fennoscandia,this could potentially influence vole food selection and population dynamics over large geographical areas.

关键词： browsing cervid herbivory induced defense Microtus

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