Resting metabolic rates increase with elevation in a mountain-dwelling lizard

查看全文 作　　者：Melissa [1]PLASMAN;Amando [1]BAUTISTA;Marshall [2]D.McCUE;Aníbal H.DÍAZ DE LA VEGA-[3]PÉREZ 机构地区：[1]Centro Tlaxcala de Biología de la Conducta,Universidad Autónoma de Tlaxcala,Tlaxcala,México;[2]Sable Systems International,Las Vegas,Nevada,USA;[3]Consejo Nacional de Ciencia y Tecnología–Centro Tlaxcala de Biología de la Conducta,Universidad Autónoma de Tlaxcala,Tlaxcala,México 出　　处：《Integrative Zoology》索引2020年第15卷第5期,共12页 基　　金：from CONACyT(MP)and the Catedras CONA-CyT program(ADP,883);the Secretaría de Medio Ambiente y Recursos Naturales for providing the collecting permits(SGPA/DGVS/15396/15 and SGPA/DGVS/007736/18). 摘　　要：ndividuals that inhabit broad elevational ranges may experience unique environmental challenges.Because temperature decreases with increased elevation,the ectotherms living at high elevations have to manage limited activity time and high thermoregulatory effort.The resting metabolic rate(RMR)of a postabsorptive animal is related to its total energy requirements as well as many other fitness traits.Mesquite lizards(Sceloporus grammicus)living on La Malinche Volcano,Mexico,inhabit a wide elevational range with some populations apparently thriving above the tree line.We measured the RMR of lizards from different elevations(i.e.,2,600,3,200,and 4,100 m)at four ecologically relevant temperatures(i.e.,15,25,30,and 35°C)and found that RMR of mesquite lizards increased with temperature and body mass.More importantly,lizards from the high-elevation population had mass specific RMR that was higher at all temperatures.While the higher RMRs of high-elevation populations imply higher metabolic costs at a given temperature these lizards were also smaller.Both of these traits may allow these high elevation populations to thrive in the face of the thermal challenges imposed by their environment. 关 键 词：altitudinal gradient ENERGETICS REPTILE SCELOPORUS temperature