Proc.Nati.Acad.Sci.USAVol.91,pp.6808-6814,July1994ColloquiumPaperThispaperwaspresentedatacolloquiumentitled"TempoandModeinEvolution"organizedbyWalterM.FitchandFranciscoJ.Ayala,heldJanuary27-29,1994,bytheNationalAcademyofSciences,inIrvine,CA.Dynamicsofadaptationanddiversification:A10,000-generationexperimentwithbacterialpopulations(experimentalevolution/macroevolutlon/naturalselection/cellsize/Escherichiacola)RICHARDE.LENSKIANDMICHAELTRAvISANO*CenterforMicrobialEcology,MichiganStateUniversity,EastLansing,MI48824-1325ABSTRACTWefollowedevolutionarychangein12pop-ulationsofEscherichiacolipropagatedfor10,000generationsinidenticalenvironments.Bothmorphology(cellsize)andfitness(measuredincompetitionwiththeancestor)evolvedrapidlyforthefirst2000generationsorsoafterthepopulationswereintroducedintotheexperimentalenvironment,but
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