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ErinBertrand,AssistantProfessor,DalhousieUniversity,Halifax,NSCanada Title:MicronutrientdemandandmicrobialinteractionsinachangingSouthernOcean Abstract:AtthecoastalSouthernOceanseaiceedge,wepreviouslyobservedepisodicironand cobalamin(vitaminB12)co-limitationofphytoplanktongrowthandidentifiedkeyrelationships betweenphytoplanktonandbacteriathatappeartoregulatethatco-limitation.HereI’ll describeaseriesofmanipulativeexperimentsexaminingtheinfluenceofelevatedtemperature andironavailabilityonthosephytoplanktonandbacterialinteractions.I’llusephysiological responsesandgeneexpressionprofilesoftheseSouthernOceanmicrobestodrawinferences aboutpotentialalterationstotheroleofmicronutrientsinstructuringcommunitiesandin drivingbiogeochemicalprocessesinachangingSouthernOcean. Imagecredits:Macro:HannahJoyWarren;Micro:JeffMcQuaid Imagecredit:NedCorkrin