Habitat productivity is a poor predictor of body size in rodents  

作　　者：Bader H.Alhajeri Lucas M.V.Porto Renan Maestri 

机构地区：[1]Department of Biological Sciences,Kuwait University,Safat,13060,Kuwait [2]Department of Ecology,Universidade Federal do Rio Grande do Sul,Porto Alegre,RS,91501-970,Brazil

出　　处：《Current Zoology》2020年第2期135-143,共9页动物学报（英文版）

基　　金：B.H.A.and L.M.V.P.did not receive any grant funding for this project.R.M.was supported by CAPES and CNPq(grant 406497/2018-4).

摘　　要：The"resource availability hypothesis"predicts occurrence of larger rodents in more productive habitats.This prediction was tested in a dataset of 1,301 rodent species.We used adult body mass as a measure of body size and normalized difference vegetation index(NDVI)as a measure of habitat productivity.We utilized a cross-species approach to investigate the association between these variables.This was done at both the order level(Rodentia)and at narrower taxonomic scales.We applied phylogenetic generalized least squares(PGLS)to correct for phylogenetic relationships.The relationship between body mas and NDVI was also investigated across rodent assemblages.We controlled for spatial autocorrelation using generalized least squares(GLS)analysis.The cross-species approach found extremely low support for the resource availability hypothesis.This was reflected by a weak positive association between body mass and NDVI at the order level.We find a positive association in only a minority of rodent subtaxa.The best fit GLS model detected no significant association between body mass and NDVI across assemblages.Thus,our results do not support the view that resource availability plays a major role in explaining geographic variation in rodent body size.

关 键 词：Bergmann's rule BODY size(body mass) HABITAT PRODUCTIVITY heat conservation HYPOTHESIS normalized difference vegetation index(NDVI) resource availability HYPOTHESIS 

分 类 号：Q94[生物学—植物学]