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1、Downloadedfromhttp://rspb.royalsocietypublishing.org/onAugust13,2018Proc.R.Soc.B(2011)278,3490–3496doi:10.1098/rspb.2011.0465Publishedonline13April2011Highactivityenableslifeonahigh-sugardiet:bloodglucoseregulationinnectar-feedingbatsDetlevH.Kelm1,*,RalphSimon2,DoreenKuhlow
2、3,ChristianC.Voigt1andMichaelRistow3,41LeibnizInstituteforZooandWildlifeResearch,Alfred-Kowalke-Strasse17,10315Berlin,Germany2InstituteofAnimalPhysiology,UniversityofErlangen,91058Erlangen,Germany3DepartmentofClinicalNutrition,GermanInstituteofHumanNutrition,14558Nuthetal,G
3、ermany4DepartmentofHumanNutrition,InstituteofNutrition,UniversityofJena,07743Jena,GermanyHighbloodglucoselevelscausedbyexcessivesugarconsumptionaredetrimentaltomammalianhealthandlifeexpectancy.Despiteconsumingvastquantitiesofsugar-richfloralnectar,nectar-feedingbatsarelong-l
4、ived,provokingthequestionofhowtheyregulatebloodglucose.Weinvestigatedbloodglucoselevelsinnectar-feedingbats(Glossophagasoricina)inexperimentsinwhichwevariedtheamountofdiet-arysugarorflighttime.Bloodglucoselevelsincreasedwiththequantityofglucoseingestedandexceeded2125mmollblo
5、odinrestingbats,whichisamongthehighestvalueseverrecordedinmammalsfedsugarquantitiessimilartotheirnaturaldiet.Duringnormalfeeding,bloodglucosevaluesdecreasedwithincreasingflighttime,butonlyfelltoexpectedvalueswhenbatsspent75percentoftheirtimeairborne.Eithernectar-feedingbatsh
6、aveevolvedmechanismstoavoidnegativehealtheffectsofhyperglycaemia,orhighactivityiskeytobalancingbloodglucoselevelsduringforaging.Wesuggestthatthecoevolutionaryspecializationofbatstowardsanectardietwassupportedbythehighactivityandelevatedmetabolicratesofthesebats.Highactivity
7、mayhaveconferredbenefitstothebatsintermsofbehaviouralinteractionsandforagingsuccess,andissimultaneouslylikelytohaveincreasedtheirefficiencyasplantpollinators.Keywords:bloodglucose;glycatedhaemoglobin;HbA1c;hyperglycaemia;nectarivory;plantpollinatorcoevolution1.INTRODUCTIONIna
8、dditiontotheirunusualdiet,nectar-feedingbatsAlargenumberofstudieshaveshownthatelev
