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Relationship between spatial distribution of chaetognaths and hydrographic conditions around seamounts and islands of the tropical southwestern Atlantic

Souza, Christiane S de ; Luz, Joana A G ; Mafalda, Paulo O

Anais da Academia Brasileira de Ciências, 2014-09, Vol.86 (3), p.1151-1165 [Periódico revisado por pares]

Brazil: Academia Brasileira de Ciências

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  • Título:
    Relationship between spatial distribution of chaetognaths and hydrographic conditions around seamounts and islands of the tropical southwestern Atlantic
  • Autor: Souza, Christiane S de ; Luz, Joana A G ; Mafalda, Paulo O
  • Assuntos: Animals ; Atlantic Ocean ; Biomass ; Brazil ; Chlorophyll - analysis ; distribuição espacial ; montes submarinos ; MULTIDISCIPLINARY SCIENCES ; nordeste do Brasil ; Population Density ; Population Dynamics ; Salinity ; Seasons ; Temperature ; variabilidade ; zooplancton ; Zooplankton - classification
  • É parte de: Anais da Academia Brasileira de Ciências, 2014-09, Vol.86 (3), p.1151-1165
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Relationship between spatial distribution of chaetognaths and hydrographic conditions around seamounts and islands off Northeastern Brazil were analyzed from 133 oceanographic stations during the months of January - April of 1997 and April - July of 1998. Oblique zooplankton tows, using 50 cm diameter Bongo nets with 500µm mesh with a flowmeter to determine the filtered volume, were carried out to a maximum of 200m depth. The Superficial Equatorial Water, which had a salinity > 36 PSU and temperature > 20°C, occupied the top 80 to 200m depth. Below this water mass was the South Atlantic Central Water with salinity ranging from 34.5 to 36 PSU and temperature from 6 to 20°C. The community of chaetognaths showed six species: Pterosagitta draco, Flaccisagitta enflata, Flaccisagitta hexaptera, Pseudosagitta lyra, Serratosagitta serratodentata, and Sagitta helenae. Of these species, F. enflata was the most abundant (32.05% in 1997 and 42.18% in 1998) and the most frequent (87.88% in 1997 and 95% in 1998) during both periods. A mesopelagic specie was identified (P. lyra). This specie was more abundant in 1997 (3.42%), when the upwelling was more intense. P. lyra occurred in 22% of the samples during 1997. The abundance of F. enflata, an epiplanktonic species, increased, associated with greater water-column stability.
  • Editor: Brazil: Academia Brasileira de Ciências
  • Idioma: Inglês;Português
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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