FN Archimer Export Format
PT J
TI Chemometric perspectives on plankton community responses to natural iron fertilisation over and downstream of the Kerguelen Plateau in the Southern Ocean
BT 
AF TRULL, Thomas
   DAVIES, Diana M.
   DEHAIRS, Frank
   CAVAGNA, Anne-Julie
   LASBLEIZ, Marine
   LAURENCEAU CORNEC, Emmanuel C.
   D'OVIDIO, Francesco
   PLANCHON, Frederic
   LEBLANC, Karine
   QUEGUINER, Bernard
   BLAIN, Stephane
AS 1:1,2;2:1,2;3:3;4:4;5:5,6;6:1,2,3;7:7;8:8;9:5,6;10:5,6;11:9,10;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;
C1 CSIRO Marine and Atmospheric Research, Hobart, Tasmania, Australia
   Antarctic Climate and Ecosystems Cooperative Research Centre, Hobart, Tasmania, Australia
   Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, Tasmania, Australia
   Analytical, Environmental and Geochemistry; Earth Sciences Research Group, Vrije Universiteit Brussel, Belgium
   Aix-Marseille Université, Marseille, France
   Université de Toulon, France
   LOCEAN–IPSL, Université Pierre et Marie Curie, Paris, France
   Laboratoire des Sciences de l’Environnement Marin (LEMAR), Université de Brest, IUEM, Plouzané, France
   Sorbonne Universités, UPMC Univ Paris 06, UMR7621, Laboratoire d’Océanographie Microbienne, Observatoire Océanologique, 66650 Banyuls/mer, France
   CNRS, Laboratoire d’Océanographie Microbienne, Observatoire Océanologique, 66650 Banyuls/mer, France
C2 CSIRO, AUSTRALIA
   ACE CRC, AUSTRALIA
   UNIV TASMANIA, AUSTRALIA
   UNIV VRIJE BRUSSEL, BELGIUM
   UNIV AIX MARSEILLE, FRANCE
   UNIV TOULON, FRANCE
   UNIV PARIS 06, FRANCE
   UBO, FRANCE
   UNIV PARIS 06, FRANCE
   CNRS, FRANCE
UM LEMAR
IN DOAJ
IF 3.7
TC 27
UR https://archimer.ifremer.fr/doc/00255/36642/35222.pdf
LA English
DT Article
CR MD 188 / KEOPS 2
   OISO 8
   OISO1
   OISO2
   OISO3-NIVMER98
   OISO4 (VT 46)
   OISO5 (VT 49)
   VT 105 / OISO 17
   VT 108 / OISO-18
   VT 114 / OISO-19
   VT 117 / OISO-20
   VT 120 / OISO-21
   VT 127 / OISO-22
   VT 136 / OISO-23
   VT 51 / OISO 6
   VT 57 / OISO 9
   VT 60 / CARAUS - OISO 10
   VT 62 / CARAUS - OISO 11
   VT 79 / OISO 12
   VT 80 / OISO 13
   VT 81 / OISO 14
   VT 85 / OISO 15
   VT 94 / OISO 16
BO Marion Dufresne
AB We examined phytoplankton community responses to natural iron fertilisation at 32 sites over and downstream from the Kerguelen Plateau in the Southern Ocean during the austral spring bloom in October-November 2011. The community structure was estimated from chemical and isotopic measurements (particulate organic carbon - POC; C-13-POC; particulate nitrogen -PN; N-15-PN; and biogenic silica - BSi) on size-fractionated samples from surface waters (300, 210, 50, 20, 5, and 1 mu m fractions). Higher values of C-13-POC (vs. co-located C-13 values for dissolved inorganic carbon -DIC) were taken as indicative of faster growth rates and higher values of N-15-PN (vs. co-located N-15-NO3 source values) as indicative of greater nitrate use (rather than ammonium use, i.e. higher f ratios). Community responses varied in relation to both regional circulation and the advance of the bloom. Iron-fertilised waters over the plateau developed dominance by very large diatoms (50-210 mu m) with high BSi / POC ratios, high growth rates, and significant ammonium recycling (lower f ratios) as biomass built up. In contrast, downstream polar frontal waters with a similar or higher iron supply were dominated by smaller diatoms (20-50 mu m) and exhibited greater ammonium recycling. Stations in a deep-water bathymetrically trapped recirculation south of the polar front with lower iron levels showed the large-cell dominance observed on the plateau but much less biomass. Comparison of these communities to surface water nitrate (and silicate) depletions as a proxy for export shows that the low-biomass recirculation feature had exported similar amounts of nitrogen to the high-biomass blooms over the plateau and north of the polar front. This suggests that early spring trophodynamic and export responses differed between regions with persistent low levels vs. intermittent high levels of iron fertilisation.
PY 2015
SO Biogeosciences
SN 1726-4170
PU European Geosciences Union (EGU)
VL 12
IS 4
UT 000349794900009
BP 1029
EP 1056
DI 10.5194/bg-12-1029-2015
ID 36642
ER

EF