JeremyKerr,aresearcherattheUniversityofOttawainCanada,a...
问题详情:JeremyKerr,aresearcherattheUniversityofOttawainCanada,andhiscolleaguesanalyzedmorethan400,000observationsofbumblebeespeciescollectedinNorthAmericaandEuropefrom1975to2010.Whentheresearchersreco...