Would behavioral thermoregulation enable pregnant viviparous tropical lizards to cope with a warmer world?  

作　　者：Saúl LÓPEZ-ALCAIDE Miguel NAKAMURA Eric N.SMITH Enrique MARTÍNEZ-MEYER 

机构地区：[1]Departament of Zoology,Institute of Biology,National Autonomous University of Mexico,Mexico City,Mexico [2]Center for Research in Mathematics,Guanajuato,Mexico [3]Amphibian and Reptile Diversity Research Center and Department of Biology,University of Texas at Arlington,Arlington,Texas,USA

出　　处：《Integrative Zoology》2017年第5期379-395,共17页整合动物学（英文版）

基　　金：sup­ported by the Programa de Apoyo a Proyectos de In­vestigación e Innovación Tecnológica(PAPIIT)of the Universidad Nacional Autónoma de México(Project number:IN221208);the Consejo Nacional para la Ciencia y la Tecnología(CONACYT)and also partial­ly supported by a National Science Foundation grant(DEB-0416160[ENS]);An Instituto Bioclon(ENS)Permit for field work in all locations was issued by Secretaria de Medio Ambiente y Recursos Naturales(SEMARNAT GPA/DGVS/04949).

摘　　要：Sceloporus lizards depend on external heat to achieve their preferred temperature(Tsel)for performing physiological processes.Evidence both in the field and laboratory indicates that pregnant females of this Genus select body temperatures(Tb)lower than 34℃ as higher temperatures may be lethal to embryos.Therefore,thermoregulation is crucial for successful embryo development.Given the increase in global air temperature,it is expected that the first compensatory response of species that inhabit tropical climates will be behavioral thermoregulation.We tested whether viviparous Sceloporus formosus group lizards in the wild exhibited differences in thermoregulatory behavior to achieve the known Tsel for developing embryos regardless of local thermal conditions.We quantified field active body temperature,thermoregulatory behavior mechanisms(time of sighting,microhabitat used and basking time)and available microhabitat thermal conditions(i.e.operative temperature)for 10 lizard species during gestation,distributed along an altitudinal gradient.We applied both conventional and phylogenic analyses to explore whether Tb or behavioral thermoregulation could be regulated in response to different thermal conditions.These species showed no significant differences in field Tb during gestation regardless of local thermal conditions.In contrast,they exhibited significant differences in their behavioral thermoregulation associated with local environmental conditions.Based on these observations,the differences in thermoregulatory behavior identified are interpreted as compensatory adjustments to local thermal conditions.We conclude that these species may deal with higher temperatures predicted for the tropics by modulating their thermoregulatory behavior.

关 键 词：altitudinal gradient behavior global warming Sceloporus formosus thermal stress 

分 类 号：TG1[金属学及工艺—金属学]