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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 12 | PAGES 2367-2376 | 1996
© Oxford University Press

research-article

Composition, spatial and temporal variations of Chaetognatha in Guanabara Bay, Brazil

A. Marazzo and C.S.R. Nogueira

Laboratório de Zooplâncron Marinho do Departamento de Biologia Mannha, Instituto de Biologia da Universidade Federal do Rio de Janeiro, Av. Brigadeiro Trompowsky, s/n, Cidade Universit{acute}ria Ilha do Fundão, CCS, Bloco A, Rio de Janeiro, RJ, Brasil CEP: 21949-900

Received on April 28, 1996; accepted on July 29, 1996 This paper presents the specific composition and distribution of adult chaetognaths in Guanabara Bay, Brazil. A comparison has been made between chaetognath and copepod distribution patterns. Three areas were distinguished within Guanabara Bay: an external area, influenced by oceanic waters; an internal area, influenced by fluvial waters; and a transitional area between the two. Monthly samples were collected by horizontal surface hauls using a conical net with 200µm mesh. Three species were identified: Sagitta friderici, S.enflata and S.hispida. Sagitta friderici was the dominant species and occurred throughout the year at the three areas. Sagitta enflata and S.hispida were limited to the more saline waters. Generally, greater densities of chaetognaths were observed following copepod peakden sities. Temperature and salinity associated with copepod abundance were the most important factors affecting the distribution pattern and the abundance of chaetognath species in Guanabara Bay.


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