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marine-phytoplankton
weddell sea
2
ammonium
1
antarctic waters
1
c-13/c-12
1
confluence area
1
indian-ocean
1
inorganic nitrogen
1
isotope fractionation
1
n-15 uptake
1
nitrate uptake
1
nutrient
1
plankton
1
productivity
1
southern-ocean
1
southwestern atlantic
1
species composition
1
surface-water
1
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