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1、AmericanJournalofPrimatology00:1–8(2012)RESEARCHARTICLESleepingTreeSelectionofCaoVitGibbon(Nomascusnasutus)LivinginDegradedKarstForestinBangliang,Jingxi,ChinaHAN-LANFEI1,MATTHEWB.SCOTT1,WENZHANG2,CHANG-YONGMA1,ZUO-FUXIANG3,ANDPENG-FEIFAN1∗1InstituteofEastern-HimalayaBiodiversityRes
2、earch,DaliUniversity,DaliYunnan,P.R.China2FaunaandFloraInternational,ChinaPrimateProgramme,NanningGuangxi,PRChina3CollegeofLifeScienceandTechnology,CentralSouthUniversityofForestry&Technology,ChangshaHunan,P.R.ChinaWestudiedthesleep-relatedbehavioroftwoCaoVitgibbon(Nomascusnasutus)
3、groupsinBangliangNatureReserveinJingxiCounty,ChinabetweenJanuary2008andDecember2009totestfourhypothesesrelatedtosleepingtreeselection(predationavoidance,thermoregulation,foodaccess,andrangedefense).Gibbonsenteredsleepingtrees88±SD37minbeforesunsetbeforetheirmainpotentialnocturnalpr
4、edatorbecomeactive.Theyusuallymovedrapidlyandstraighttosleepingtreesandkeptsilentoncesettled.Overthecourseofthestudy,gibbongroupsusedmany(87and57pergroup)sleepingtreesandreusedthemirregularly.Theyalsotendedtosleepinrelativelytalltreeswithoutlianas,choosingsmallbranchesclosetothetre
5、etop.Thesebehaviorswouldmakeitdifficultforpotentialterrestrialpredatorstodetectandapproachthegibbons.Therefore,theseresultsstronglysupportthepredationavoidancehypothesis.Gibbonstendedtosleepclosertoridgesthantovalleybottomsandtheydidnotsleepatlowerelevationsincoldermonths.Theythusap
6、pearednottoselectsleepingtreestominimizethermoregulatorystress.Gibbonsveryrarelysleptinfeedingtrees,insteadgenerallysleepingmorethan100mawayfromthelastfeedingtreesofthedayorthefirstfeedingtreeofthenextmorning.Thesepatternsledustorejectthefoodaccesshypothesis.Lastly,wedidnotfindeviden
7、cetosupporttherangedefensehypothesisbecausegibbonsdidnotsleepinoverlapareaswithneighborsmoreoftenthanexpectedbasedontheproportionofoverlapandexclusivelyusedareas.Am.J.Primatol.00:1–8,2012.C2012WileyPeriodicals,Inc.Keywords:CaoVitgibbon;sleepingbehavior;predationavoidance;thermoreg
8、ulation;rangedefenseINTROD
