Algae control 2 Ammonium compounds 2 Antarctic regions 2 Atlantic Ocean 2 Atlantic Ocean (Southwest) 2 Atmospheric temperature 2 Biogeochemistry 2 Biological materials 2 Coastal waters 2 Drake passage 2 Inverse relationship 2 Isotopes 2 Isotopic enrichment 2 Multiple regressions 2 N value 2 Nutrient gradients 2 Nutrients 2 Ocean habitats 2 Organic carbon 2 Particulate organic matters 2 Phytoplankton 2 Plankton 2 Regenerative system 2 Sea surface temperatures 2 Sea surfaces 2 Seawater 2 Seston 2 Shallow waters 2 Shelf ecosystems 2 Shelf waters 2