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OriginalArticleTheinfluenceofleafsizeandshapeonleafthermaldynamics:doestheoryholdupundernaturalconditions?A.Leigh1,S.Sevanto2,J.D.Close3&A.B.Nicotra41SchoolofLifeSciences,UniversityofTechnologySydney,Broadway,NSW2007,Australia,2EarthandEnvironmentalSciencesDivision,LosAlamosNationalLaboratory,LosAlamos,NM87545,USA,3DepartmentofQuantumScience,ResearchSchoolofPhysicsandEngineering,AustralianNationalUniversity,CanberraACT2601,Australiaand4ResearchSchoolofBiology,AustralianNationalUniversity,CanberraACT2601,AustraliaABSTRACTLaboratorystudiesonartificialleavessuggestthatleafthermaldynamicsarestronglyinfluencedbythetwo-dimensionalsizeandshapeofleavesandassociatedboundarylayerthickness.Hotenvironmentsarethereforesaidtofavourselectionforsmall,narrowordissectedleaves.Empiricalevidencefromrealleavesunderfieldconditionsisscantandtraditionallybasedonpointmeasurementsthatdonotcapturespatialvariationinheatload.Weusedthermalimageryunderfieldconditionstomeasuretheleafthermaltimeconstant(τ)insummerandthele...