Effects of low-oxygen conditions on embryo growth in the painted turtle,Chrysemys picta

作     者：Gerardo A.CORDERO Matthew L.KARNATZ Jon C.SVENDSEN Eric J.GANGLOFF 

作者机构：Department of EcologyEvolutionand Organismal BiologyIowa State UniversityAmesIowaUSA Technical University of DenmarkNational Institute of Aquatic ResourcesFreshwater FisheriesSilkeborgDenmark Interdisciplinary Centre of Marine and Environmental ResearchUniversity of PortoPortoPortugal 

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

年 卷 期：2017年第12卷第2期

页      面：148-156页

核心收录：

学科分类：1001[医学-基础医学(可授医学、理学学位)] 100104[医学-病理学与病理生理学] 10[医学] 

基　　金：funded in part by graduate student research awards from the ISU-EEOB and NSF grant DEB-1242510(to F.Janzen) J.C.Svendsen was sup­ported by grant SFRH/BPD/89473/2012 from the Foun­dation for Science and Technology in Portugal 

主　　题：embryo metabolism embryo respiration growth rate nest environment oxygen consumption rate 

摘      要：Low-oxygen conditions(hypoxia;21%O_(2))are considered unfavorable for growth;yet,embryos of many vertebrate taxa develop successfully in hypoxic subterranean *** enhanced tolerance to hypoxia has been demonstrated in adult reptiles,such as in the painted turtle(Chrysemys picta),its effects on sensitive embryo life stages warrant *** tested the hypothesis that short-term hypoxia negatively affects growth during day 40 of development in ***,when O_(2) demands are highest in embryos.A brief,but severe,hypoxic event(5%O_(2) for 0.5 h)moderately affected embryo growth,causing a 13%reduction in mass(relative to a normoxic control).The same condition had no effect during day 27;instead,a nearly anoxic event(1%O_(2) for 72 h)caused a 5%mass *** embryos survived the egg incubation *** study supports the assumption that reptilian embryos are resilient to intermittently low O_(2) in subterranean *** work is needed to ascertain responses to suboptimal O_(2) levels while undergoing dynamic changes in developmental physiology.