MacrozooplÃncton da zona econÃmica exclusiva do Nordeste do Brasil (revizee neii e neiii) com Ãnfase em Copepoda

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

The macrozooplankton from the Economic Exclusive Zone of Northeastern Brazil (7O28â56âS - 34O32â45âW ; 7O30â30âS - 34O29â08âW) was studied to assess its diversity and distribution. Samples were collected at 44 stations from 31/01 to 07/02/92(NE-II) and from 11 to 16/05/98 (NE-III by the Oceanographic Ship Antares from the Brazilian Navy. A bongo net (300 and 500 μm mesh size) was hauled obliquely at a speed of 2 to 2.5 knots from a depth of 200m to surface. A digital flowmeter was fitted onto the opening of the net. Samples were preserved in a 4% buffered formalin/seawater solution. A total of 104 species were identified. Copepoda was the most abundant group in the macrozooplankton, and in most samples outranked Undinula vulgaris. Total density during the NE-II varied from 3.97 to 258.53 org.m-3 (500 μm mesh size net) and from 10.78 to 540.46 org.m-3 (300μm mesh size net); and during the NE-III from 3.61 to 76.38 org.m-3 (500 μm mesh size net) and from 21.2 to 358.01 org.m-3 (300μm mesh size net). Most frequent were Crustacea and Chaetognatha followed in decreasing order by Cnidaria, Teleostei (eggs and larvae), Mollusca, Annelida, Chordata and Protozoa. Species diversity during the NE-II varied from 0.591 to 3.437 ind.bits-1 (500 μm mesh size net) and from 0.648 to 4.037 bits.ind-1 (300μm mesh size net); and during the NE-III from 0.503 to 3.141 bits.ind-1 (500 μm mesh size net) and from 0.676 a 4.505 bits.ind-1 (300μm mesh size net). During NE-II eveness varied from 0.373 to 0.960 (500 μm mesh size net) and from 0.279 to 1.0 (300 μm mesh size net); and during NE-III from 0.267 to 0.967 (500 μm mesh size net) and from 0.261 to 0.934 (300 μm mesh size net). Low diversity and eveness were caused by peaks of Undinula vulgaris and Calanopia americana, although it was observed a good species distribution. No Copepoda groups were formed to the area by cluster analysis

ASSUNTO(S)

anatomia animal copepoda macrozoplÃncton nordeste brasileiro

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