Caracterização oceanográfica e do transporte de sedimentos em suspensão no estuário do Rio Mampituba, SC

D'Aquino, Carla de Abreu; Neto, João Silva de Andrade; Barreto, Guilherme Algemiro Manique; Schettini, Carlos Augusto França

doi:10.1590/s0102-261x2011000200001

Cited by 16 publications

(5 citation statements)

References 13 publications

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“…It may explain why 222 Rn activity is higherin this region than the one found in the other sites in the area under study. In the same region, the mouth of the Mampituba River (Figure 1), a small body of water with an average flow of only 19m³.s -1 [39], can give small contributions to 222 Rn activity during flood periods. However, this activity probably reaches only a few meters from its mouth.…”

Section: Spatial Distribution Of 222 Rnmentioning

confidence: 99%

Distribution of 222RN on the Continental Shelf in Southern Brazil and its Relation with Groundwater Discharge

Souza¹,

Andrade²,

Paiva³

et al. 2020

International Journal of Oceans and Oceanography

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222 Rn has been widely used as a tracer ofsubmarine groundwater discharge (SGD) processes because it offers certain advantages, such as being an inert gas that is found at high concentrations in groundwater. This studyshows, for the first time, the distribution of this element on the continental shelf adjacent to Rio Grande do Sul state, Brazil. It describes its relation with sources and oceanographic processes, as well as its contribution to the profile of SGD along the state coast that stretches over 400 km. Since it also aims to fill gaps in the understanding of the SGD process, it answers the following question: what are the constancy and the scope of the process along this coastal system? SGD quantificationwas made from 222 Rn mass balance. 222 Rn activity ranged from values below the detection limit to 1.23 ± 0.32 dpm.L -1 . Perpendicular to the coastline, 222 Rn activity decreased offshore at a rate of 0.5 dpm.L -1 .km -1 up to approximately 10 km from the coast, where it was constant and below 0.4 dpm.L -1 . Groundwater fluxes were 5.66 ± 1.30 (southern region), 2.06 ± 1.02 (central region), 5.50 ±1.50 (northern region) and 6.63 ± 1.03 cm.day -1 (northern region). Variability in advection rates found by this study shows that, incoastal systems which are dominated by a certain type of sediment, some factors, such as local hydrodynamics and geology, can alter SGD quantitatively.

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Section: Spatial Distribution Of 222 Rnmentioning

confidence: 99%

Distribution of 222RN on the Continental Shelf in Southern Brazil and its Relation with Groundwater Discharge

Souza¹,

Andrade²,

Paiva³

et al. 2020

International Journal of Oceans and Oceanography

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“…Estuários são ambientes de transição na interface do ecossistema continente-oceano, cujos processos de transporte e mistura de massas d'água continentais e marinhas exercem uma atividade de filtro para os materiais particulados e dissolvidos, bem como de nutrientes orgânicos e inorgânicos, que são transportados em direção ao mar (Dyer, 1995;D'Aquino et al, 2011;Miranda et al, 2012;Pinto-Coelho & Havens, 2015), exercendo um papel significativo para a alta produtividade biológica destas regiões costeiras (Kelts, 1988;Odum & Barret, 2007).…”

Section: Introductionunclassified

Variação espacial e intra-anual de foraminíferos bentônicos e indicadores biogeoquímicos no estuário do Real, Litoral Norte da Bahia, Brasil

Azevedo

Moraes

Silva

et al. 2022

Rev. bras. paleontol.

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Spatial and intra-annual variation of foraminifera and biogeochemical indicators in the Real estuary, northern coast of Bahia, Brazil. The aim of this research was to carry out the biogeochemical characterization of the Real estuary, northern coast of Bahia, using the seasonal variation of foraminifera and physical-chemical, sedimentological, and geochemical data. During the rainy season were obtained 324 foreheads (Jul/2013), with Trochammina inflata in abundance (75.85%). In the April campaign, 298 foraminifera were found in 10 sampling points, especially T. inflata (40.60%), Quinqueloculina lamarckiana (9.73%), Ammonia tepida (8.05%) and Trochammina globigeriniformis (5.70%). In the dry season, 148 foreheads belonging to 14 species were registered, such as Q. lamarckiana (21.19%), Trochammina sp. (10.60%), T. inflata (10.60%), Nonion sinensis (5.96%), Peneroplis proteus (5.96%), and Quinqueloculina bicornis (5.96%). In addition, the faunal composition reflects an environmental condition of high hydrodynamic energy, with clear evidence of oligohaline waters typical of environments with strong river discharges, and absence of anomalies in the foreheads, suggesting an environment without evident anthropogenic changes. The levels of Ca and Al, in both hydrological periods, varied significantly between the sampling stations, but they should not be causing adverse effects on the biota of the Real estuary. The contents of Mg (which come from primary sources) and Fe (which is punctual and seems to be a result of anthropic activity) found are above the reference limits, but does not appear to be causing changes in the balance of the local ecosystem. Keywords: foraminifera, estuary, trace metals, Northeast of Brazil, bioindicators, taphonomy. RESUMO – O objetivo da pesquisa foi realizar a caracterização biogeoquímica do estuário do Real, Litoral Norte-Bahia, utilizando a variação sazonal de foraminíferos e dados físico-químicos, sedimentológicos e geoquímicos. Foram obtidas 324 testas na estação chuvosa (Jul/2013), destacando-se Trochammina inflata (75,85%). Na campanha de abril, foram encontrados 298 foraminíferos em 10 pontos amostrais, destacando-se T. inflata (40,60%), Quinqueloculina lamarckiana (9,73%), Ammonia tepida (8,05%) e Trochammina globigeriniformis (5,70%). Na estação seca, registraram-se 148 testas pertencentes a 14 espécies, das quais destacam-se Q. lamarckiana (21,19%), Trochammina sp. (10,60%), T. inflata (10,60%), Nonion sinensis (5,96%), Peneroplis proteus (5,96%), Quinqueloculina bicornis (5,96%). Além disso, a composição faunística reflete uma condição ambiental de alta energia hidrodinâmica, com evidência claras de águas oligohalinas próprias de ambientes com fortes descargas fluviais, e ausências de anomalias nas testas, sugere um ambiente sem alterações antrópicas evidentes. Os teores de Ca e Al, em ambos os períodos hidrológicos variaram significativamente entre as estações de amostragem, mas não devem estar provocando efeitos adversos à biota do estuário do Real. Já os teores de Mg, que são oriundos de fontes primárias, e de Fe, que é pontual e parece ser resultante de atividade antrópica, embora estejam acima dos limites de referência, não parecem estar causando alterações no equilíbrio do ecossistema local. Palavras-chave: foraminíferos, estuário, metais traço, Nordeste do Brasil, bioindicadores, tafonomia.

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“…The average depth is 4 m and the mouth is stabilized by a pair of jetties (north jetty, 100 m and south jetty, 260 m). The tidal pattern is microtidal and is primarily governed by the wind regime (D'Aquino et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Occurrence and abundance of young mullet Mugil liza (Teleostei: Mugilidae) in the surf zone along the southern coast of Brazil

Lemos

Cabral

Pasquaud

et al. 2021

scimar

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The southern population of Mugil liza is distributed from Argentina (47°S) to the state of São Paulo, Brazil (23°S). Young mullets use the estuaries as nursery grounds, and prior to recruitment into estuaries they use the surf zone as a temporary habitat. Based on 12 consecutive months of sampling, this study used generalized linear models (GLM) to analyse the relationships between environmental variables and the presence and relative abundance of young mullets in the surf zone adjacent to six major estuaries in southern Brazil (between 29°S and 33°S). Young mullets were present in all seasons over the sampling period, but the probability of occurrence was higher in winter and was associated with low temperatures. The water temperature alone explained more than half of the total deviance of the GLM models for presence (23%) and abundance (21%) of young mullets in the surf zone. Site 2 (Rio Grande) had lower temperatures in the colder months, the highest probability of occurrence of all collection sites and the greatest abundance (n=3402) of young M. liza, which represented 52% of the total of individuals (n=6493) caught among the six sites sampled.

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Caracterização oceanográfica e do transporte de sedimentos em suspensão no estuário do Rio Mampituba, SC

Cited by 16 publications

References 13 publications

Distribution of 222RN on the Continental Shelf in Southern Brazil and its Relation with Groundwater Discharge

Distribution of 222RN on the Continental Shelf in Southern Brazil and its Relation with Groundwater Discharge

Variação espacial e intra-anual de foraminíferos bentônicos e indicadores biogeoquímicos no estuário do Real, Litoral Norte da Bahia, Brasil

Occurrence and abundance of young mullet Mugil liza (Teleostei: Mugilidae) in the surf zone along the southern coast of Brazil

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