Microbial Communities in the East and West Fram Strait During Sea Ice Melting Season

摘要: Climate models project that the Arctic Ocean may experience ice-free summers by second half of this century. This have severe repercussions on phytoplankton bloom dynamics and associated cycling carbon in surface waters. We currently lack baseline knowledge seasonal microbial communities, which is needed order to better estimate effects such changes ecosystem functioning. Here we present a comparative study polar summer communities (eastern) ice-covered (western) hydrographic regimes at LTER HAUSGARTEN Fram Strait, main gateway between North Atlantic Oceans. Based measured modeled biogeochemical parameters, tentatively identified two different states (i.e., stages) distinct regions. Using Illumina tag-sequencing, determined community composition both free-living particle-associated bacteria as well eukaryotes photic layer. Despite substantial horizontal mixing eddies pelagic showed differences regimes, with proposed early spring (pre-bloom) western regime (with higher representation SAR11, SAR202, SAR406 eukaryotic MALVs) indicative late conditions (post-bloom) eastern Flavobacteria, Gammaproteobacteria heterotrophs). Co-occurrence networks revealed specific taxon-taxon associations bacterial taxa Our results suggest predicted sea ice cover will strong impact potentially cycles region.