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Changes in microplanktonic protists assemblages promoted by the thermocline induced stratification around an oceanic archipelago Anais da ABC (AABC)
COSTA,ALEJANDRO E.S.F. DA; SANTANA,JANA R. DE; NEUMANN-LEITÃO,SIGRID.
Abstract In the area around the archipelago of São Pedro e São Paulo (ASPSP), a set of small rocky islands in the Equatorial Atlantic, the thermocline begins at a more superficial depth than in the surrounding waters. This raises the question if there is any change in heterotrophic microplanktonic protists assemblages occurring in the surface mixed layer and in the subsurface layer. To answer this question, we sampled seawater in seven depths (between 1-100 m) with a 10L Niskin bottle and obtained temperature and salinity profiles with a CTD at eight sites around the ASPSP. The depth of the surface mixed layer varied between 18-63 meters. Dinoflagellates dominated in terms of abundance representing over 80% and 65% of the individuals found in the surface...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinoflagellates; Ecological indicators; Polycystine radiolarians; Tintinnid ciliates; Tropical oceans; Vertical distribution.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502249
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Copepod distribution and production in a Mid-Atlantic Ridge archipelago Anais da ABC (AABC)
MELO,PEDRO A.M.C.; MELO JÚNIOR,MAURO DE; MACÊDO,SILVIO J. DE; ARAUJO,MOACYR; NEUMANN-LEITÃO,SIGRID.
The Saint Peter and Saint Paul Archipelago (SPSPA) are located close to the Equator in the Atlantic Ocean. The aim of this study was to assess the spatial variations in the copepod community abundance, and the biomass and production patterns of the three most abundant calanoid species in the SPSPA. Plankton samples were collected with a 300 µm mesh size net along four transects (north, east, south and west of the SPSPA), with four stations plotted in each transect. All transects exhibited a tendency toward a decrease in copepod density with increasing distance from the SPSPA, statistically proved in the North. Density varied from 3.33 to 182.18 ind.m−3, and differences were also found between the first perimeter (first circular distance band) and the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Oligotrophic; Plankton; St. Peter and St. Paul archipelago; Tropical; Upwelling.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401719
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The first occurrence of the Order Mormonilloida (Copepoda) in the Tropical Southwest Atlantic Ocean Anais da ABC (AABC)
MELO,PEDRO AUGUSTO M.C.; MELO JÚNIOR,MAURO DE; ARAÚJO,MOACYR; NEUMANN-LEITÃO,SIGRID.
This communication is the first report of the occurrence of the order Mormonilloida (Mormonilla phasma) in the tropical Southwestern Atlantic Ocean. Female individuals were found in surface waters from the shelf break state of Rio Grande do Norte (Northeastern Brazil) and between depths of 60 and 100 m in the epipelagic layer around the St. Peter and St. Paul Archipelago (equatorial Atlantic). This finding extends the vertical limits for this species.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Copepod; Equatorial; Mormonilloida; Mormonilla phasma; Oceanic island; Zooplankton.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000100233
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