Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter–summer aspects

Braga, Elisabete S.; Chiozzini, Vitor C.; Berbel, Glaúcia Bueno Benedetti; Maluf, João Carlos Cattini; Aguiar, V.M.C.; Charo, Marcela; Molina, Daniel; Romero, Sílvia I.; Eichler, Beatriz Beck

doi:10.1016/j.csr.2007.06.018

Cited by 72 publications

(51 citation statements)

References 6 publications

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“…This transport is most intense during austral winter [19], when Subantarctic Shelf Water (SASW) is also transported northwards by the Patagonian Current (PC), which results in a wedge of cold water between PPW and STSW [19], [37]. A high silicate and phosphate concentration was associated with the terrestrial input from PPW and austral waters from SASW [21]. A sharp thermohaline frontal system exists between STSW and SASW around 33°S, named the Subtropical Shelf Front (STSF) [37], which increases local nutrient availability in the euphotic zone, primary production and zooplankton abundance [26].…”

Section: Methodsmentioning

confidence: 99%

Large-Scale Ichthyoplankton and Water Mass Distribution along the South Brazil Shelf

et al. 2014

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Ichthyoplankton is an essential component of pelagic ecosystems, and environmental factors play an important role in determining its distribution. We have investigated simultaneous latitudinal and cross-shelf gradients in ichthyoplankton abundance to test the hypothesis that the large-scale distribution of fish larvae in the South Brazil Shelf is associated with water mass composition. Vertical plankton tows were collected between 21°27′ and 34°51′S at 107 stations, in austral late spring and early summer seasons. Samples were taken with a conical-cylindrical plankton net from the depth of chlorophyll maxima to the surface in deep stations, or from 10 m from the bottom to the surface in shallow waters. Salinity and temperature were obtained with a CTD/rosette system, which provided seawater for chlorophyll-a and nutrient concentrations. The influence of water mass on larval fish species was studied using Indicator Species Analysis, whereas environmental effects on the distribution of larval fish species were analyzed by Distance-based Redundancy Analysis. Larval fish species were associated with specific water masses: in the north, Sardinella brasiliensis was found in Shelf Water; whereas in the south, Engraulis anchoita inhabited the Plata Plume Water. At the slope, Tropical Water was characterized by the bristlemouth Cyclothone acclinidens. The concurrent analysis showed the importance of both cross-shelf and latitudinal gradients on the large-scale distribution of larval fish species. Our findings reveal that ichthyoplankton composition and large-scale spatial distribution are determined by water mass composition in both latitudinal and cross-shelf gradients.

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Section: Methodsmentioning

confidence: 99%

Large-Scale Ichthyoplankton and Water Mass Distribution along the South Brazil Shelf

et al. 2014

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“…No AC, durante o inverno de 2005, foram observadas maiores concentrações de clorofila a, comparada a região do CSMG, relacionadas com a entrada de nutrientes com a pluma do Río de la Plata (Attisano 2007). Durante o verão, a concentração de espécies na região do CSMG esteve possivelmente relacionada com a ressurgência costeira da ACAS, também reconhecidamente rica em nutrientes (Braga 2008). em geral, as águas costeiras formadas pela PrP dominam a plataforma continental do Sul do Brasil no inverno e podem, em condições de ventos favoráveis, alcançar a latitude de 28 °S, próximo ao CSMG; no verão, a pluma fica normalmente restrita a ~32 °S.…”

Section: Discussionunclassified

Dinoflagelados (Peridiniales, Prorocentrales) do microplâncton na plataforma continental e talude do extremo sul do Brasil (inverno 2005, verão 2007)

Islabão

Odebrecht

2011

Biota Neotrop.

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Este estudo teve por objetivo identificar as morfo-espécies de dinoflagelados do microplâncton (>20 μm) das Ordens Peridiniales e Prorocentrales ao largo do Cabo de Santa Marta Grande, CSMG (SC, 28º 40' S) e Albardão-Chuí, AC (RS, 34º 40' S) durante dois cruzeiros oceanográficos: inverno de 2005 e verão de 2007. Amostras de plâncton foram coletadas através de arrastos verticais com rede de plâncton (20 μm), preservadas com formalina 4% e analisadas ao microscópio invertido equipado com câmara digital. Quando necessário, a identificação de espécies de Peridiniales foi efetuada através do número e morfologia das placas da teca realçadas com Calco Flúor Branco MR2; espécies de Prorocentrales foram identificadas com base em seu tamanho, forma, presença de processos apicais, padrão dos poros e marcas na faixa intercalar. Foram identificadas 25 espécies, das quais Protoperidinium (11), Prorocentrum (6), Corythodinium (3), Podolampas (2), Oxytoxum (2) e Heterocapsa (1). Espécies de Prorocentrum apresentaram ampla distribuição na plataforma continental do extremo sul do Brasil, enquanto as espécies de Peridiniales foram observadas principalmente na região do Albardão-Chuí durante o inverno, sob a influência da Pluma do Río de la Plata. Oxytoxum milneri foi pela primeira vez registrada na região sul do País, e Protoperidinium cassum var. cassum, P. curtipes e Heterocapsa triquetra foram registradas pela primeira vez no Brasil.

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“…These data analysis from the entire water column are described in Braga et al (2008), but in our work we have used preferentially the bottom water information. Dissolved oxygen (mLL -1 ) was first extracted and measured by the Winkler procedure using an automated titration method (Grasshoff et al, 1983).…”

Section: Water Samplesmentioning

confidence: 99%

Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblages

et al. 2012

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More than 30% of Buccella peruviana (D'Orbigny), Globocassidulina crassa porrecta (Earland & HeronAllen), Cibicides mackannai (Galloway & Wissler) and C. refulgens (Montfort) indicate the presence of cold Sub Antarctic Shelf Water in winter, from 33.5 to 38.3° S, deeper than 100 m, in the southern part of the study area. In summer, the abundance of this association decreases to less than 15% around 37.5-38.9° S where two species (Globocassidulina subglobosa (Brady), Uvigerina peregrina (Cushman) take over. G. subglobosa, U. peregrina, and Hanzawaia boueana (D'Orbigny) are found at 27-33° S in both seasons in less than 55 m deep in the northern part, and are linked with warm Subtropical Shelf Water and Tropical Water. Keywords: foraminifera diversity, subantarctic and subtropical shelf water, subtropical shelf front, freshwater influence.Registro do gradiente latitudinal, de descargas de rios e de massas de água ao longo da costa subtropical da América do Sul, utilizando-se associações de foraminíferos bentônicos Palavras-chave: diversidade de foraminíferos, água de plataforma subantártica e subtropical, frente subtropical de plataforma, influência de água doce.

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Nutrient distributions over the Southwestern South Atlantic continental shelf from Mar del Plata (Argentina) to Itajaí (Brazil): Winter–summer aspects

Cited by 72 publications

References 6 publications

Large-Scale Ichthyoplankton and Water Mass Distribution along the South Brazil Shelf

Large-Scale Ichthyoplankton and Water Mass Distribution along the South Brazil Shelf

Dinoflagelados (Peridiniales, Prorocentrales) do microplâncton na plataforma continental e talude do extremo sul do Brasil (inverno 2005, verão 2007)

Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblages

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