Oxygen supply did not affect how lizards responded to thermal stress

作     者：Agustín CAMACHO John M.VANDENBROOKS Angela RILEY Rory S.TELEMECO Michael J.ANGILLETTA Jr 

作者机构：School of Life SciencesArizona State UniversityTempeArizonaUSA Department of PhysiologyInstitute of BiosciencesUniversity of São PauloBrazil Department of PhysiologyMidwestern UniversityGlendaleArizonaUSA Department of BiologyCalifornia State UniversityFresnoCaliforniaUSA 

出 版 物：《Integrative Zoology》 (整合动物学（英文版）)

年 卷 期：2018年第13卷第4期

页      面：428-436页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：This research was approved by the Institutional Animal Care and Use Committee(Protocol#15-1431R) Collection of lizards was approved by AZ Game and Fish Department(SP721353) Funds were provided by FAPESP(Grant 15/01300-3 and 12/15754-8 to ACG) Arizona State University and Midwestern University 

主　　题：hypoxia Sceloporus stress temperature thermoregulation 

摘      要：Zoologists rely on mechanistic niche models of behavioral thermoregulation to understand how animals respond to climate *** models predict that species will need to disperse to higher altitudes to persist in a warmer ***,thermal stress and,thus,thermoregulatory behavior may depend on atmospheric oxygen as well as environmental *** hypoxia causes animals to prefer lower body temperatures,which could be interpreted as evidence that oxygen supply limits heat *** a constraint could prevent animals from successfully dispersing to high elevations during climate ***,an effect of oxygen supply on preferred body temperature has only been observed when oxygen concentrations fall far below levels experienced in *** see whether animals perceive greater thermal stress at an ecologically relevant level of hypoxia,we studied the thermoregulatory behavior of lizards(Sceloporus tristichus)exposed to oxygen concentrations of 13%and 21%(equivalent to PO2 at 4000 m and 0 m,respectively).In addition,we exposed lizards to 29%oxygen to see whether they would accept a higher body temperature at hyperoxia than at *** each oxygen level,we measured a behavioral response to heat stress known as the voluntary thermal maximum:the temperature at which a warming animal sought a cool *** concentration had no discernable effect on the voluntary thermal maximum,suggesting that lizards experience thermal stress similarly at all 3 levels of oxygen(13%,12%and 29%).Future research should focus on thermoregulatory behaviors under ecologically relevant levels of hypoxia.