trophic level Atlantic Ocean 16 Argentina 14 community structure 10 Atlantic Ocean (Southwest) 8 biomass 8 chlorophyll a 8 nonhuman 8 zooplankton 8 Copepoda 6 Patagonia 6 abundance 6 animal tissue 6 crustacean 6 stable isotope 6 Animals 4 Article 4 Atlantic Ocean (South) 4 Brazil-Malvinas Confluence 4 Cetacea 4 Environmental Monitoring 4 Southwestern Atlantic 4 Water Pollutants, Chemical 4 bioaccumulation 4 biodiversity 4 carbon isotope 4 chlorophyll 4 controlled study 4 copepods 4 feeding ecology 4