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1、ARTICLEINPRESSJournalofThermalBiology35(2010)11–20ContentslistsavailableatScienceDirectJournalofThermalBiologyjournalhomepage:www.elsevier.com/locate/jtherbioThermalsensitivityofmetabolicenzymesinsubarcticandtemperatefreshwatermussels(Bivalvia:Unionoida)a,nabcaHe´leneDouce
2、t-Beaupre´,CarolineDube´,SophieBreton,HansO.Portner¨,PierreU.BlieraDe´partementdeBiologieUniversite´duQue´becaRimouski,LaboratoiredeBiologieE´volutive,300Alle´edesUrsulines,Rimouski,Que´bec,CanadaG5L3A1bDepartmentofBiologicalSciences,KentStateUniversity,Kent,OH44242,USAc
3、AlfredWegenerInstituteforPolarandMarineResearch,IntegrativeEcophysiology,Postfach120161,27515Bremerhaven,GermanyarticleinfoabstractArticlehistory:Temperaturehasamajorimpactonthephysiologicalprocessesoffreshwaterinvertebrates.DespitetheReceived7July2009endangeredstatusofman
4、yfreshwatermusselspeciesandthepotentialeffectofglobalwarmingonAccepted5October2009NorthAmerica’snorthernaquatichabitats,thermalsensitivityofthemetabolicapparatusoffreshwaterbivalveshasreceivedlittleattention.Byexaminingthethermalsensitivityof10keymetabolicenzymesKeywords:a
5、ndinsitugrowthratesoflatitudinallyseparatedpopulations(temperateandsubarctic)oftwoclosely-FreshwatermusselsrelatedPyganodonspeciesfromnortheasternNorthAmerica,weprovidethefirstinsightsintothermalPyganodonsensitivityofkeyenzymesofenergyandreactiveoxygenspeciesmetabolisminrel
6、ationtohabitatSubarcticlocalizationandgrowthperformance.ThesubarcticpopulationofPyganodongrandisdisplayedhigherinMetabolismsitugrowthratesthanthetemperatepopulationofPyganodonfragilis.ThesubarcticpopulationofMitochondriaP.grandishadalowermitochondrialcapacityasexpressedbyc
7、itratesynthaseandcytochromecoxidaseEnzymesbutdisplayedsimilarelectrontransportsystem(ETS)andhigherisocitratedehydrogenasecapacities.ThermalsensitivityAntioxidantOurresultssuggestthathighergrowthperformanceofthesubarcticpopulationofP.grandisisnotassociatedwithhigheraerobicc
8、apacity.ThehighthermalsensitivityofmitochondrialenzymesinsubarcticpopulationofP.grandismi
