OCEANOGRAPHIC CHARACTERIZATION OF INNER CONTINENTAL SHELF NEAR CABO FRIO - RJ, IN THE WINTER OF 1995

Authors

  • L. SAAVEDRA Universidade
  • L.M.A. DORNELLES Universidade
  • S. B. SANTOS Universidade
  • R. ABSALÃO Universidade
  • S. M. C. ANJOS Universidade
  • G. V. MELO Universidade
  • N.S.G. STANTON Universidade
  • E. M. FONSECA Universidade
  • L. L. LIMA Universidade
  • E. T. KÜSEL Universidade
  • E. O. RIBEIRO Universidade
  • A. A. A. LAZILLOTA Universidade
  • F. A. ESTEVES Universidade Federal do Rio de Janeiro

Keywords:

heavy metals, water masses, suspended material, continental shelf of Cabo Frio, molluses

Abstract

The muddy sediments of the continental shelf near to Cabo Frio (RJ-Brazil) are principally being formed by sediments coming from Paraiba do Sul river and Guanabara bay. The purpose of this work was to determine the distribution of water masses, currents, suspended material and Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn, in the bottom sediments of the continental shelf near to Cabo Frio, in association with organic matter, calcium carbonate, fine particles and organisms. The water masses identified were Coastal and Tropical Water. The mineralogy of suspended material in the Coastal Water showed predominance of clay minerals followed by quartz, pyrite, k-feldspar and siderite. The bottom currents indicated predominantly sediment transport toward coast before passage of the cold front, and to offshore after this. Cr, Cu, Fe, Mn, Ni, Pb correlated positively with fine particles (< 0.062 mm), organic matter and cadmium. Nucula semiornatta, Adrana Patagonia - detritivorous - and Corbula patagonica - filter-feeding - (Bivalvia), are abundant on line 1 and could be used as biological monitors to the studied region.

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Published

2010-01-08

Issue

Vol. 7 (1999): Oecologia Brasiliensis - Ecologia dos ambientes costeiros do estado do Rio de Janeiro

Section

Articles