Continental shelf water masses off the Jaguaribe River (4S), northeastern Brazil

Dias, Francisco; Castro, Belmiro Mendes de; Lacerda, Luiz Drude de

doi:10.1016/j.csr.2013.06.005

Cited by 52 publications

(42 citation statements)

References 34 publications

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“…The spread TS diagram analysis for the sampling period reveals an increase in salinity observed during the dry season. It can be explained by the fluvial flux decreasing (Mearim and Pindaré Rivers) and marine waters influence on the São Marcos Bay, which is probably due to the decrease in the aspect ratio determined by free surface variation and surface gravity wave propagation (Dias et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…The TS diagram pointed out two water masses in the São Marcos Bay (2010-2011) based on the criteria adopted by Dias et al (2013) (Figure 3). The water masses were well characterized seasonally, with the presence of warmer waters (T > 29 ºC) with lower salinity (S < 30) compatible with the river water mass during the rainy season, mainly through the months of March 2010 and April 2011.…”

Section: Meteorological and Hydrological Variablesmentioning

confidence: 99%

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Structure of microphytoplankton community and environmental variables in a macrotidal estuarine complex, São Marcos Bay, Maranhão - Brazil

et al. 2018

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Cavalcanti et al.: Microphytoplankton of a macrotidal estuarine complex 283 Structure of microphytoplankton community and environmental variables in a macrotidal estuarine complex, São Marcos Bay, Maranhão -BrazilSão Marcos Bay is an estuarine complex with semidiurnal tides that can reach more than 7 m during equinoctial spring tides. It is situated in the second largest Brazilian coastline and is subjected to continuous human activities holding an important port complex of Latin America. In order to contribute to the knowledge about the structure of the phytoplankton in a macrotidal systems, this study aims to evaluate the phytoplankton community and its relationship with environmental conditions in the São Marcos Bay. Five surveys in 2010 and 2011 were carried out on four sampling points during the rainy and dry seasons. Samples were taken during the flood and ebb phases at neap tides. Hydrological parameters were correlated with biological data (phytoplankton composition, abundance and biomass) using statistical analysis. The phytoplankton biomass (chlorophyll a) characterized the bay as quite productive (10.43±7.62 mg m -3 ) with the nanophytoplankton as the dominant fraction. Seasonal variation was observed in phytoplankton abundance with higher values (34,262±18,422 cells L -1 ) in the rainy season. Diatoms were the most important phytoplankton group, pointing out Nitzschia sp., Diploneis weissflogii and Synedra sp. as the dominant species. This study revealed that the composition of phytoplankton community was mainly influenced by the local dynamics, governed by macrotides, and precipitation regime that mostly contributed to the seasonal fluctuations of the environmental conditions, such as salinity, dissolved oxygen, and nutrients.

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Section: Discussionmentioning

confidence: 99%

Section: Meteorological and Hydrological Variablesmentioning

confidence: 99%

Structure of microphytoplankton community and environmental variables in a macrotidal estuarine complex, São Marcos Bay, Maranhão - Brazil

et al. 2018

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“…Apesar da homogeneidade vertical da coluna de água houve aumento da condutividade, com estratificação apenas nas estações 7, 8 e 9 do transecto 2 podendo ser atribuído aos pequenos rios que deságuam na área adjacente. A temperatura da água esteve acima de 28°C, resultante da mistura das massas de água costeira e continental (Dias et al, 2013). No período de seca, há uma clara diminuição dos fluxos fluviais e um potencial aumento do domínio de águas costeiras sobre o CESM, que fica evidenciado em eventos de maré de quadratura, como apontam os dados deste estudo, e corrobora os resultados obtidos por Lefvre et al (2017).…”

Section: Clima E Parâmetros Físico-químicosunclassified

Caracterização biogeoquímica da matéria orgânica em um estuário de macromaré localizado na interface Amazônia-semiárido no nordeste do Brasil

Corrêa¹,

Serejo²,

Rangel³

et al. 2019

Geochim. Bras.

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RESUMOOs estuários são ambientes costeiros de transição, que atuam como um filtro natural e sítio de troca de água e matéria, principalmente matéria orgânica, onde grande parte do carbono pode ser importado e/ou exportado. O objetivo deste estudo é compreender a composição da matéria orgânica na coluna de água do Complexo Estuarino da Baía de São Marcos, um ambiente sob a influência de macromaré semi-diurna. Para traçar a distribuição da matéria orgânica com mais precisão, a composição elementar é usada juntamente com a composição isotópica do carbono e do nitrogênio. A amostragem foi realizada em agosto de 2016, em três transectos, totalizando 14 estações. A água foi amostrada em duas profundidades diferentes, subsuperficie e fundo. Os seguintes parâmetros foram medidos: material particulado em suspensão, carbono orgânico dissolvido, carbono orgânico particulado, isótopos estáveis de carbono e nitrogênio, razão atômica (C/N)a. Os parâmetros condutividade elétrica, oxigênio dissolvido e temperatura foram medidos in situ. O material particulado em suspensão teve média de 360,6 mg L -1 ) no meio com uma pequena diminuição (média de 344,6 mg L -1 ) para a parte mais interna da baía. O carbono orgânico apresentou maiores concentrações sob a forma dissolvida (média 10,97 mg L -1 ), variando entre as profundidades e os pontos amostrais. As concentrações de nitrogênio total foram baixas (média 0,38 mg L -1 ), estando relacionadas à pouca influência de compostos nitrogenados. A razão isotópica e C/N indicam que o manguezal representa uma importante fonte de carbono orgânico particulado e dissolvido nesse estuário. Palavras-chave: Complexo estuarino, marcadores geoquímicos, carbono orgânico, isótopos estáveis, Complexo Estuarino da Baía de São Marcos ABSTRACTEstuaries are transitional, coastal environments that act as natural filters and areas for the exchange of water and materials, mainly organic matter, which is composed of a significant portion of the transported carbon. Estuaries may import, export or retain dissolved and particulate organic matter. The aim of this study is to understand the composition of the organic matter in the water column of São Marcos Bay Estuarine Complex, a macrotidal environment under influence of semidiurnal tides. To investigate the distribution of organic matter more precisely, the elemental composition was used along with the carbon and nitrogen isotopic composition. The sampling was carried out in August 2016, in 3 transects, with a total of 14 stations. The water was sampled in two different depths, subsurface and bottom. The following parameters were measured: suspended particulate matter, dissolved organic carbon, particulate organic carbon, carbon and nitrogen stable isotopes andthe atomic ratio (C/N)a. The parameters electrical conductivity, dissolved oxygen, and temperature were measured in situ. SPM had a mean of 360.6 (mg L -1 ) in the medium with a small decrease (mean of 344.6 mg L -1 ) for the innermost part of the bay. The organic carbon presented higher concentrations in t...

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“…In addition, the sampling locality is only 35 km away from another suitable habitat for this species: the Jaguaribe Estuary. The water volume passing through this estuary is responsible for approximately 50% of the State's total outflow, making the Jaguaribe River drainage basin the largest fluvial contribution to the State of Ceará's continental shelf (Dias et al ., 2013).…”

Section: Figurementioning

confidence: 99%

The southernmost record and an update of the geographical range of the Atlantic chupare, Styracura schmardae (Chondrichthyes: Myliobatiformes)

Sales

Freitas

Cavalcante

et al. 2020

Journal of Fish Biology

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The present study established the southernmost distribution range for the Chupare stingray Styracura schmardae based on a specimen caught on the easternmost portion of Ceará State, northeastern Brazil. Identification was based on diagnostic morphological characters and molecular data (sequence of the mitochondrial DNA gene nd2; 1046 bp). This record expands the known distribution range for this species by more than 1200 km and confirms that S. schmardae is distributed in more than one biogeographical province. Significance statement There are few records of the Atlantic Chupare stingray for Brazil and most of them are associated with the Amazon River mouth. New records indicate that this species is also present in the South Atlantic portion of the Brazilian coast. Apparently having a low abundance throughout its range, these new records increase the range of occurrence of this species.

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Continental shelf water masses off the Jaguaribe River (4S), northeastern Brazil

Cited by 52 publications

References 34 publications

Structure of microphytoplankton community and environmental variables in a macrotidal estuarine complex, São Marcos Bay, Maranhão - Brazil

Structure of microphytoplankton community and environmental variables in a macrotidal estuarine complex, São Marcos Bay, Maranhão - Brazil

Caracterização biogeoquímica da matéria orgânica em um estuário de macromaré localizado na interface Amazônia-semiárido no nordeste do Brasil

The southernmost record and an update of the geographical range of the Atlantic chupare, Styracura schmardae (Chondrichthyes: Myliobatiformes)

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