Diet shift in bank voles induced by competition from grey-sided voles?  

作　　者：Magnus MAGNUSSON Gustaf SAMELIUS Birger HÖRNFELDT Frauke ECKE 

机构地区：[1]Department of Wildlife,Fish,and Environmental Studies,Swedish University of Agricultural Sciences,Umeå,Sweden [2]2Snow Leopard Trust,Seattle,USA [3]Department of Ecology,Swedish University of Agricultural Sciences,Riddarhyttan,Sweden

出　　处：《Integrative Zoology》2019年第4期376-382,共7页整合动物学（英文版）

基　　金：the anonymous reviewers for their con­structive comments.Financial support was received from stiftelsen Oscar och Lili Lamms minne,from Helge Ax:son Johnsons stiftelse and from the Swedish Research Council FORMAS(Dnr 2017-00867).

摘　　要：Grey-sided voles(Myodes rufocanus)and bank voles(Myodes glareolus)co-exist in boreal forests in north­ern Scandinavia.Previous studies suggest that the 2 species interact interspecifically,the grey-sided vole be­ing the dominant species.We tested the hypothesis that bank voles shift their diet due to competition with the dominant grey-sided vole by studying stable isotope ratios in both species.Muscle samples were taken from voles in patches of old forest occupied by only bank voles and patches of old forest occupied by both grey-sid­ed voles and bank voles.We found that:(i)stable isotope ratios of bank voles differed in areas with and with­out grey-sided voles;and that(ii)the stable isotope ratios of bank voles were more similar to those of grey-sid­ed voles in areas where grey-sided voles were absent.Our data suggests that grey-sided voles forced bank voles to change their diet due to interspecific competition.

关 键 词：COMPETITION diet shift Myodes glareolus Myodes rufocanus stable isotopes 

分 类 号：H32[语言文字—法语]