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Title [sv]
Internationellt forskningssamarbeta med fokus på Amundsenhavet (ASPIRE): Mikrobiella samhällens variation och betydelse för kolomsättningen i södra ishavet
Title [en]
Amundsen Sea Polynya International Research Expedition (ASPIRE): Patchiness and significance of microbial communities controlling the Southern Ocean carbon cycle
Abstract [sv]
In this project, we will collaborate with a team of US and Swedish scientists with the aim of investigating climate controls on productivity and carbon fluxes in the extremely productive Amundsen Sea Polynya. Specifically, we will assess the role and significance of microbial community composition (MCC) and viral activity in controlling the flux of carbon through the microbial food web. This includes (i) “the microbial loop” where detritus is returned back to the food web, (ii) “the viral shunt” where cell lysis transforms biomass to dissolved detritus, and (iii) chemoautotrophic carbon fixation, which may complement photosynthesis. We hypothesize that these key processes are intimately linked to MCC. Composition will be analyzed by 454 sequencing and dominant microbial groups quantified using fluorescent in situ hybridization (FISH). Active keystone microbial species/groups will be identified using BrdU incorporation, immunocapture, and 454 sequencing as well as by microradiography combined with FISH. Viral abundance and production will be quantified. Results will be combined with the dataset generated by the Swedish/US collaborators to identify the ecosystem drivers regulating MCC. Participation in three consecutive field seasons, and our data from the Oden expedition 2007/08, will allow us to capture enough inter-annual and regional variability to model the role of long-term climate- and environmental change on MCC and dominant microbe-driven biogeochemical processes.
Principal InvestigatorBertilsson, Stefan
Coordinating organisation
Uppsala University
Funder
Period
2010-01-01 - 2010-12-31
Identifiers
DiVA, id: project:3458Project, id: 2008-06430_VR

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