Argentina 189 Buenos Aires [Argentina] South America article 26 Western Hemisphere 25 World 25 Mar del Plata 22 Buenos Aires 18 Rio de la Plata 18 Atlantic Ocean 16 abundance 15 Aves 14 Animals 13 nonhuman 13 rodent 13 Gastropoda 12 Rodentia 11 morphology 11 Ecology 10 biomass 10 dispersion 10 gastropod 10 water quality 10 Animalia 9 seasonal variation 9 Decapoda (Crustacea) 8 Nitrogen oxides 8 atmospheric pollution 8 biodiversity 8 cluster analysis 8