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UB BIO 200 - Bio Last Chapter 3

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Whatdopredatorsdo?1)searchimages2)avoid/usetoxins3)getthrougharmor-ambushhunting-stalkinghunting-canbelongsearching-pursuithunting-notalotofsearching,canbelongTheLatitudinalgradient-Whatisdiversity?↳speciesrichness=the#ofspeciespresent↳Evenness=therelativeabundanceofspecies-speciesrichnessincreaseswitharea-whatisthelatitudinalgradientinspeciesdiversity?↳morespeciesatlow erlatitudes(tropic sthanatpoles)potentialhypothesesforcauseofthegradient.'1)Climatestability2)Increasedcompetition3)Increasedpredation4)Increasedenergy-Ecologicalhypothesis5)Evol utionarytime-Evolutionaryhypothesis1)Climatestability↳tropi cshav elow estannualtemprangeforglobe↳disturbancehypothesis,seasonshardtohandle-seasonsaredisturbance,makesspeciesveryhardtosurvive2.1Increasedcompetitionresourc emorecompetition?temperature<availabilitypiBut:tropicsishighresourc ehabitatnine8¥eaYaPsomearentused4I11113speciesw/broadniches5specieswlnarrowresourc e sniches3)Incre asedPredati on↳resultofhigherdiver sityNO Tcause!4)IncreasedEnergy:3pre dictions1)increasedproductivity2)Overwinteringtolerance3)Ambientenergy5)Evolutionar yTime-tro picalforestsarefarsmallerthanintheCretaceousnicheconservatism:-whenor ganismsmaintaintheirancestralnicheinthefaceofenvir onmental*transitionsTEocene-MioceneclimateshiftIssueswithener gyhypothesis:Acorrelationdoesntequalcausation2)Increasedenergydoesntansw erthequestionThegradientinwesternhemispherebirds:-Dr.Bradfor


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