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1、JournalofAppliedBlackwellPublishing,Ltd.Pollendispersalofoilseedrape:estimationofthedispersalEcology200643,141–151functionandeffectsoffielddimensionETIENNEK.KLEIN,*CLAIRELAVIGNE,†HERVEPICAULT,‡MICHELRENARD‡andPIERRE-HENRIGOUYON†*UnitédeRecherchesForestièresMédite
2、rranéennes/Unitédebiométrie,InstitutNationaldelaRechercheAgronomique,DomaineSaint-Paul,F-84914Avignon,Cedex9,France;†LaboratoireEcologie,SystématiqueetEvolution,UMR8079,CentreNationaldelaRechercheScientifique/UniversitéParis-Sud,Bât.360,F-91405Orsay,Cedex,France;
3、and‡InstitutNationaldelaRechercheAgronomique,Stationd’AméliorationdesPlantes,BP29,F-35653LeRheu,FranceSummary1.Debatecontinuesregardingtheecologicalimpactsofgeneticallymodified(GM)cropsandtheircoexistencewithnon-GMcropsinEurope.Inthisdebate,quantitativepre-dictio
4、nsofgenedispersalbypollenarenecessary,andasaresultnumerousplot-to-plotgeneflowexperimentshavebeenperformedwithvariouscrops.However,plot-to-plotcross-pollinationrates(CPR)dependonspatialconfigurationofplots,implyingthat(i)theyaredifficulttocompareamongexperimentsand
5、(ii)functionsdirectlyfittedonCPRdataareinappropriateforpredictionsinotherspatialcontexts.2.Modellingpollendispersalviaanindividualdispersalfunction(IDF)circumventstheseproblemsbyaccountingforspatialdesigns.Wedetailforoilseedrapehowthisapproachcanbeusedtobothestim
6、ateanIDFfromfielddataandpredictCPRbetweentwoneighbouringfieldsofvarioussizesandshapes.PredictionswereusedtoinvestigatethesensitivityofCPRtothefamilyofIDF,theuncertaintyinparameterestimatesandtheeffectsoffielddimensionsandisolationdistances.3.Wefittedarangeoffamilies
7、ofIDF,includingseveraltypesoftails,onpreviouslypublisheddata.ThebestIDFwasafat-tailedpower-lawfunction,meaningfrequentlong-distancedispersal.4.ThechoiceofIDFappearedcrucialwhenpredictingCPRbetweenfields,occasionallybeingevenmoreimportantthanthedistancebetweenfield
8、s.Widthofthesourcefieldanddepthoftherecipientfieldwerenextinimportance.WhenapproximatedCPRwerecalculatedwithoutconsideringfielddimensions,usingdistancebetweenfieldcentres
