FN Archimer Export Format
PT J
TI Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the southern Indian Ocean and the Southern Ocean
BT 
AF HOERSTMANN, Cora
   RAES, Eric J.
   BUTTIGIEG, Pier Luigi
   LO MONACO, Claire
   JOHN, Uwe
   WAITE, Anya M.
AS 1:1,2;2:1,3,4,5;3:6;4:7;5:1,8;6:1,3,4;
FF 1:;2:;3:;4:;5:;6:;
C1 Alfred Wegener Inst Polar & Marine Sci, Bremerhaven, Germany.
   Jacobs Univ, Dept Life Sci & Chem, Bremen, Germany.
   Dalhousie Univ, Ocean Frontier Inst, Halifax, NS, Canada.
   Dalhousie Univ, Dept Oceanog, Halifax, NS, Canada.
   CSIRO Oceans & Atmosphere, Hobart, Tas, Australia.
   GEOMAR, Helmholtz Metadata Collaborat, Kiel, Germany.
   Sorbonne Univ, LOCEAN IPSL, Paris, France.
   Helmholtz Inst Funct Marine Biodivers, Oldenburg, Germany.
C2 INST A WEGENER, GERMANY
   UNIV JACOBS, GERMANY
   UNIV DALHOUSIE, CANADA
   UNIV DALHOUSIE, CANADA
   CSIRO OCEANS & ATMOSPHERE, AUSTRALIA
   IFM GEOMAR, GERMANY
   UNIV PARIS 06, FRANCE
   HELMHOLTZ INST FUNCT MARINE BIODIVERS, GERMANY
IN DOAJ
IF 5.092
TC 14
UR https://archimer.ifremer.fr/doc/00755/86727/92172.pdf
   https://archimer.ifremer.fr/doc/00755/86727/92173.pdf
   https://archimer.ifremer.fr/doc/00755/86727/92174.pdf
   https://archimer.ifremer.fr/doc/00755/86727/92175.zip
LA English
DT Article
CR MD 206 / OBSAUSTRAL
   OISO - OCÉAN INDIEN SERVICE D'OBSERVATION
   VT 153 / OISO-27
BO Marion Dufresne
AB Biogeochemical cycling of carbon (C) and nitrogen (N) in the ocean depends on both the composition and activity of underlying biological communities and on abiotic factors. The Southern Ocean is encircled by a series of strong currents and fronts, providing a barrier to microbial dispersion into adjacent oligotrophic gyres. Our study region straddles the boundary between the nutrient-rich Southern Ocean and the adjacent oligotrophic gyre of the southern Indian Ocean, providing an ideal region to study changes in microbial productivity. Here, we measured the impact of C and N uptake on microbial community diversity, contextualized by hydrographic factors and local physico-chemical conditions across the Southern Ocean and southern Indian Ocean. We observed that contrasting physico-chemical characteristics led to unique microbial diversity patterns, with significant correlations between microbial alpha diversity and primary productivity (PP). However, we detected no link between specific PP (PP normalized by chlorophyll-a concentration) and microbial alpha and beta diversity. Prokaryotic alpha and beta diversity were correlated with biological N-2 fixation, which is itself a prokaryotic process, and we detected measurable N-2 fixation to 60 degrees S. While regional water masses have distinct microbial genetic fingerprints in both the eukaryotic and prokaryotic fractions, PP and N-2 fixation vary more gradually and regionally. This suggests that microbial phylogenetic diversity is more strongly bounded by physical oceanographic features, while microbial activity responds more to chemical factors. We conclude that concomitant assessments of microbial diversity and activity are central to understanding the dynamics and complex responses of microorganisms to a changing ocean environment. 
PY 2021
PD JUL
SO Biogeosciences
SN 1726-4170
PU Copernicus Gesellschaft Mbh
VL 18
IS 12
UT 000665535800002
BP 3733
EP 3749
DI 10.5194/bg-18-3733-2021
ID 86727
ER

EF