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

Autor(es)

Yoshinaga, Marcos Y. ^[1] ; Sumida, Paulo Y. G. ^[1] ; Silveira, Ilson C. A. ^[1] ; Ciotti, Aurea M. ^[2] ; Gaeta, Salvador A. ^[1] ; Pacheco, Luiz F. C. M. ^[1] ; Koettker, Andrea G. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Oceanog, BR-05508120 Sao Paulo - Brazil

^[2] UNESP, BR-11330900 Sao Vicente, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF MARINE SYSTEMS; v. 79, n. 1-2, p. 124-133, JAN 2010.
• Citações Web of Science: 12

Resumo

Abundance and composition of marine benthic communities have been relatively well studied in the SE Brazilian coast, but little is known on patterns controlling the distribution of their planktonic larval stages. A survey of larval abundance in the continental margin, using a Multi-Plankton Sampler, was conducted in a cross-shelf transect off Cabo Frio (23 degrees S and 42 degrees W) during a costal upwelling event. Hydrographic conditions were monitored through discrete CDT casts. Chlorophyll-a in the top 100 m of the water column was determined and changes in surface chlorophyll-a was estimated using SeaWiFS images. Based on the larval abundances and the meso-scale hydrodynamics scenario, our results suggest two different processes affecting larval distributions. High larval densities were found nearshore due to the upwelling event associated with high chlorophyll a and strong along shore current. On the continental slope, high larval abundance was associated with a clockwise rotating meander, which may have entrapped larvae from a region located further north (Cabo de Sao Tome, 22 degrees S and 41 degrees W). In mid-shelf areas, our data suggests that vertical migration may likely occur as a response to avoid offshore transport by upwelling plumes and/or cyclonic meanders. The hydrodynamic scenario observed in the study area has two distinct yet extremely important consequences: larval retention on food-rich upwelling areas and the broadening of the tropical domain to southernmost subtropical areas. (C) 2009 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 01/00165-2 - O impacto do bloom de fitoplancton nas comunidades benticas ao largo de cabo frio-rj e ubatuba-sp: respostas a regimes de produtividade primaria contrastantes.
• Beneficiário: Paulo Yukio Gomes Sumida
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 04/06369-7 - O aporte da matéria orgânica nos sedimentos da margem continental de Cabo Frio (RJ) e Ubatuba (SP): avaliação da origem, quantidade e qualidade da matéria orgânica disponível à cadeia alimentar bêntica
• Beneficiário: Marcos Yukio Yoshinaga
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto