FN Archimer Export Format
PT J
TI SAR11 clade microdiversity and activity during the early spring blooms off Kerguelen Island, Southern Ocean
BT 
AF Dinasquet, Julie
   Landa, Marine
   Obernosterer, I. Ingrid
AS 1:1,2;2:1,3;3:1;
FF 1:;2:;3:;
C1 CNRS, Sorbonne Université, Laboratoire d'Océanographie Microbienne, LOMIC Banyuls‐sur‐Mer , France
   Marine Biology Research Division and Climate, Atmospheric Science & Physical Oceanography Department Scripps Institution of Oceanography San Diego California , USA
   Sorbonne Université/Centre National de la Recherche Scientifique UMR7144, Adaptation et Diversité en Milieu Marin, Station Biologique de Roscoff Roscoff, France
C2 CNRS, FRANCE
   UNIV CALIF SAN DIEGO, USA
   UNIV SORBONNE, FRANCE
IF 3.3
TC 5
UR https://archimer.ifremer.fr/doc/00789/90119/97657.pdf
LA English
DT Article
CR MD 188 / KEOPS 2
BO Marion Dufresne
AB The ecology of the SAR11 clade, the most abundant bacterial group in the ocean, has been intensively studied in temperate and tropical regions, but its distribution remains largely unexplored in the Southern Ocean. Through amplicon sequencing of the 16S rRNA gene, we assessed the contribution of the SAR11 clade to bacterial community composition in the naturally iron fertilized region off Kerguelen Island. We investigated the upper 300 m at seven sites located in early spring phytoplankton blooms and at one high-nutrient low-chlorophyll site. Despite pronounced vertical patterns of the bacterioplankton assemblages, the SAR11 clade had high relative abundances at all depths and sites, averaging 40% (±15%) of the total community relative abundance. Micro-autoradiography combined with CARD-FISH further revealed that the clade had an overall stable contribution (45%–60% in surface waters) to bacterial biomass production (determined by 3H-leucine incorporation) during different early bloom stages. The spatio-temporal partitioning of some of the SAR11 subclades suggests a niche specificity and periodic selection of different subclades in response to the fluctuating extreme conditions of the Southern Ocean. These observations improve our understanding of the ecology of the SAR11 clade and its implications in biogeochemical cycles in the rapidly changing Southern Ocean. 
PY 2022
PD DEC
SO Environmental Microbiology Reports
SN 1758-2229
PU Wiley
VL 14
IS 6
UT 000846495500001
BP 907
EP 916
DI 10.1111/1758-2229.13117
ID 90119
ER

EF