Vertical distribution of benthic invertebrate larvae during an upwelling event along a transect off the tropical Brazilian continental margin

摘要: Abstract Abundance and composition of marine benthic communities have been relatively well studied in the SE Brazilian coast, but little is known on patterns controlling distribution their planktonic larval stages. A survey abundance continental margin, using a Multi-Plankton Sampler, was conducted cross-shelf transect off Cabo Frio (23°S 42°W) during costal upwelling event. Hydrographic conditions were monitored through discrete CDT casts. Chlorophyll-a top 100 m water column determined changes surface chlorophyll-a estimated SeaWiFS images. Based abundances meso-scale hydrodynamics scenario, our results suggest two different processes affecting distributions. High densities found nearshore due to event associated with high chlorophyll strong along shore current. On slope, clockwise rotating meander, which may entrapped larvae from region located further north (Cabo de Sao Tome, 22°S 41°W). In mid-shelf areas, data suggests that vertical migration likely occur as response avoid offshore transport by plumes and/or cyclonic meanders. The hydrodynamic scenario observed study area has distinct yet extremely important consequences: retention food-rich areas broadening tropical domain southernmost subtropical areas.