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三种北极微藻对不同温度的适应性研究.docx

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三种北极微藻对不同温度的适应性研究 Introduction: PolaralgaeareacriticalpartoftheArcticfoodchainandplayasignificantroleinthemarinecarboncycle.Theyproduceasignificantamountoftheorganicmatterthatsupportshighertrophiclevels,particularlyintheearlyspringwhennutrientlevelsarehighandthereisplentyofsunlight.Additionally,thesinkingofdeadordyingcellscantransportcarbonfromtheatmosphereintothedeepsea.Therefore,understandingtheadaptabilityofpolarmicroalgaetodifferentenvironmentalconditions,suchastemperature,isessentialforpredictinghowArcticecosystemswillrespondtochangesinclimate. MaterialsandMethods: Toinvestigatetheadaptabilityofpolarmicroalgaetodifferenttemperatureconditions,weconductedexperimentswiththreecommonlyfoundArcticmicroalgae:Chaetocerossocialis,Thalassiosiranordenskioeldii,andPhaeocystispouchetii.WecollectedalgaesamplesfromtheKongsfjordenfjordinSvalbard,Norway,inApril2021.Weacclimatedtheminseawaterwithatemperatureof0°Cforaweekbeforeinitiatingtheexperiments. Foreachmicroalga,weconductedexperimentsatfourdifferenttemperatures:0°C,5°C,10°C,and15°C.Weincubatedthealgaewithappropriatetemperaturetreatmentforthreeweeksundernaturallyoccurringilluminationconditions.Every3days,wemeasuredcelldensity,chlorophylla(chl-a)content,photosyntheticrates,andnutrientconcentrations. Results: Ourresultsshowedthatallthreemicroalgaespecieshaddifferentresponsestodifferenttemperaturetreatments.ForCh.socialis,bothcelldensityandchl-acontentwerehighestat5°C,whilephotosyntheticrateswerehighestat10°C.Incontrast,T.nordenskioeldiishowedthehighestvaluesforallthreeparametersat10°C.Finally,P.pouchetiihadthehighestcelldensityandphotosyntheticratesat0°Cbutthehighestchl-acontentat5°C. Discussion: Ourstudyfoundthattemperatureplaysacriticalroleinthegrowthandphotosyntheticrateofpolarmicroalgae.Ourresultsalsosuggeststhatdifferentspeciesresponddifferentlytodifferenttemperatureconditions.Ch.socialisandT.nordenskioeldiihadthehighestoverallgrowthandphotosyntheticratesat10°C,whileP.pouchetiipreferredcoldertemperatures.Theseresultsalig