Sand bar opening in a coastal lagoon (Iquipari) in the northern region of Rio de Janeiro State: hydrological and hydrochemical changes

Suzuki, Marina Satika; Figueiredo, R. O.; Castro, S C; Silva, C F; Pereira, E A; Silva, J A; Aragon, Glauca Torres

doi:10.1590/s1519-69842002000100007

Cited by 56 publications

(41 citation statements)

References 11 publications

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“…In order to improve fishing activities in the northern region of the State of Rio de Janeiro, Brazil, the implementation of artificial sandbars separating coastal lagoons from the sea has become a common practice (Suzuki et al, 2002). However, these sandbar openings can cause radical changes in the physicochemical properties and physical and chemical conditions of these areas, including drastic reductions in water volume and profound changes in the biota, including aquatic macrophytes, such as S. auriculata, due to excess brackish water and increased salt water influx (Suzuki et al, 2002). In addition, intrusion processes of saline or brackish water in these coastal ecosystems may cause an indirect salinization process of other water bodies not directly connected to the sea, by groundwater (Gomes et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl.

et al. 2017

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Cite as: Gomes, M.A.C. et al. Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl. Acta Limnologica Brasiliensia, 2017, vol. 29, e9. Abstract: Aims: Effects of salt stress on the physiology of Salvinia auriculata were investigated. Method: Plants were supplemented with 0, 50, 100 and 150 mmol L -1 NaCl and incubated for 5 days. NO content was evaluated after 2 hours and 5 days. Photosynthetic pigments, proline and nutrients were analyzed after 5 days. Major Results: Higher chlorophyll a content was observed in plants treated with 50 mmol L -1 , decreasing in higher NaCl concentrations, while chorophyll b content decreased with increasing NaCl concentrations. Exposure to 50 mmol L -1 NaCl increased biomass, while higher concentrations caused loss of biomass. Ca, K and Mg decreased with increasing NaCl concentrations, and the Na/K ratio was significantly increased at 150 mmol L -1 NaCl. Proline increased significantly at 150 mmol L -1 . Extracellular NO content increased after 2 hours, with significantly higher NO concentrations in roots observed at 50 mmol L -1 . Decreases in NO content were observed after 5 days. Conclusions: The results indicate that moderate salinity induces NO production earlier during incubation, probably associated to signaling for the production of compounds that assist in stress tolerance. At higher concentrations, this tolerance is reduced. This allows for further understanding of the physiological and biochemical mechanisms associated with the adaptation of this macrophyte to saline conditions, which, in turn, affect this species ecology and distribution in coastal areas.Keywords: Salvinia auriculata; salinity stress; nitric oxide; clorophyll; NaCl; macrophyte.Resumo: Objetivos: Efeitos do estresse salino sobre a fisiologia de Salvinia auriculata foram investigados. Metodologia: As plantas foram expostas a 0, 50, 100 e 150 mmol de NaCl L -1 e incubadas durante 5 dias. O conteúdo de NO foi avaliado após 2 horas e 5 dias. Pigmentos fotossintéticos, prolina e nutrientes foram analisados após 5 dias. Resultados Principais: Observou-se maior teor de clorofila a em plantas tratadas com 50 mmol L -1

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Section: Introductionmentioning

confidence: 99%

Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl.

et al. 2017

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“…As the construction and maintenance of channels are very expensive and can only be afforded by large Municipalities, the artificial sand bar opening has been the most widely-used procedure, which causes disturbance to the lagoon ecosystems. The sand bar openings cause radical alteration of the physical and chemical conditions including drastic reduction of water volume, perishing of freshwater communities transported to the sea, passive and active entrance of marine species into the lagoon, and osmotic stress to freshwater, brackish, and marine species (Aguiaro and Caramaschi, 1995;Suzuki et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Environmental changes and zooplankton temporal and spatial variation in a disturbed brazilian coastal lagoon

2007

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The Imboassica lagoon, located in the Municipality of Macaé (RJ), is separated from the sea by a sand bar, and its surroundings are partially occupied by residential areas. This coastal lagoon has undergone environmental degradation due to sewage input and artificial sand bar openings. The temporal and spatial variation of environmental variables and zooplankton were studied monthly for four years. There were five artificial openings of the sand bar during the period of study, mostly in the rainy season. Besides osmotic changes, these events caused the drainage of the water of the lagoon into the sea, loss of total organic nitrogen, and an increase of total phosphorus. The zooplankton community of Imboassica lagoon included freshwater and marine taxa, holoplanktonic, meroplanktonic and nectobenthonic forms. Polychaeta, Bivalvia and Gastropoda larvae, and the taxa of Rotifera Hexarthra spp., Lecane bulla, Synchaeta bicornis, nauplii of Cyclopoida and Calanoida copepods were considered constant taxa. Distinct zooplankton assemblages were found during zooplankton spatial surveys in oligohaline and mesohaline conditions. The successful zooplankton populations were either favored by the disturbance of the sand bar opening, such as the veligers of the gastropod Heleobia australis, or capable of fast recovery after the closing of the sand bar, during the succession from a marine into an oligohaline environment, such as Hexarthra spp.. Such populations seemed well adapted to the stress conditions usually found in the lagoon due to osmotic changes, column mixing, nutrient input, and high fish predation pressure. Rare species in the community, such as Moina minuta, presented population increases all over the lagoon under oligohaline conditions. Keywords: zooplankton community, coastal lagoon, sand bar opening, Hexarthra spp., Moina minuta.Mudanças ambientais e variação temporal e especial do zooplâncton em uma lagoa costeira brasileira submetida a distúrbios ResumoA Lagoa Imboassica, localizada no Município de Macaé (RJ), é separada do mar por uma barra de areia e se encontra cercada parcialmente por áreas residenciais. Esta lagoa costeira tem sofrido intensa degradação ambiental devido à afluência de esgotos domésticos e a aberturas artificiais da barra de areia. Neste estudo foram acompanhadas, mensalmente ao longo de quatro anos, as variações temporais e espaciais de variáveis ambientais e do zooplâncton. Durante o período estudado foram realizadas cinco aberturas artificiais da barra de areia, sendo a maioria efetuada na época chuvosa. Além das alterações osmóticas, estas aberturas causaram a drenagem da água da lagoa para o mar, diminuição dos valores de nitrogênio total e aumento da concentração de fósforo total. A comunidade zooplanctônica da lagoa incluiu táxons de água doce e marinhos e formas holoplanctônicas, meroplanctônicas e nectobentônicas. Foram considerados constantes na comunidade larvas de Polychaeta, Bivalvia e Gastropoda, os táxons de Rotifera Hexarthra spp., Lecane bulla, Synchaeta bicornis e...

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“…lagoon characteristics and their intrinsic hydrochemical dynamics are directly related to the relative influence of continental and marine waters received, which generate a biogeochemical gradient from inner lagoon areas toward the sea (castel et al, 1996;Suzuki et al, 2002). the generally lowland lagoon locations promote organic and inorganic materials accumulation, especially in coastal lagoons, which results in elevated degrees of natural eutrophication.…”

Section: Introductionmentioning

confidence: 99%

Seasonal hydrochemical variation in a tropical coastal lagoon (Açu Lagoon, Brazil)

Chagas

Suzuki

2005

Braz. J. Biol.

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Hydrochemical conditions in the açu lagoon are described using spatial and temporal variations of various limnological variables (water temperature, dissolved oxygen, electric conductivity, total alkalinity, carbon dioxide, dissolved and total nutrients (n, p and Si), and chlorophyll a). collected data was used in order to understand the structure and functioning of an enclosed coastal lagoon strongly influenced by climatic conditions. Water samples were collected monthly (november 1999-december 2000) in five sampling stations established along the lagoon. a decreasing spatial gradient of electrical conductivity was observed beginning from a sand bar region between the lagoon and the sea in the direction of the sweet-water input area. the positive correlation observed between the pH and dissolved oxygen (do) values, and the negative one observed between pH values and those of carbon dioxide (co 2 ), evidenced coupled biological processes, e.g., primary production and decomposition. Both spatial and temporal variation of dissolved nutrients showed fast increase and decrease in the beginning of summer, suggesting that nutrient input resulting from rainfall stimulates phytoplankton production, as reflected by chlorophyll a concentration increase.Keywords: coastal lagoon, hydrochemistry, dissolved nutrients. RESUMOVariação sazonal da hidroquímica em uma lagoa costeira tropical (Lagoa do Açu, Brasil) condições hidroquímicas da lagoa do açu são descritas usando a variação espacial e temporal de algumas variáveis limnológicas (temperatura da água, oxigênio dissolvido (od), condutividade elétrica, alcalinidade total, co 2 , nutrientes dissolvidos e totais (n, p, Si) e clorofila a para entender a estrutura e funcionamento de uma lagoa costeira isolada e fortemente influenciada pela sazonalidade. amostras de água foram coletadas mensalmente (novembro 1999 a dezembro 2000) em cinco estações de amostragem estabelecido ao longo da lagoa. um gradiente espacial decrescente de condutividade elétrica foi observado da região da barra de areia, que separa a lagoa do mar, em direção a região que recebe entrada de água doce. a correlação positiva entre os valores de pH e oxigênio dissolvido, e negativa observada destes com o co 2 , evidencia o acoplamento de processos biológicos, como o de produção primaria e de decomposição. a variação espaço temporal de nutrientes dissolvidos mostrou um rápido incremento e redução da concentração de nutrientes dissolvidos no inicio do verão, sugerindo que a entrada de nutrientes pelas chuvas é um fator que estimula o crescimento fitoplanctônico, refletido pelo aumento da concentração de clorofila a.Palavras-chave: lagoa costeira, hidroquímica, nutrientes dissolvidos.

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Sand bar opening in a coastal lagoon (Iquipari) in the northern region of Rio de Janeiro State: hydrological and hydrochemical changes

Cited by 56 publications

References 11 publications

Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl.

Salinity effects on photosynthetic pigments, proline, biomass and nitric oxide in Salvinia auriculata Aubl.

Environmental changes and zooplankton temporal and spatial variation in a disturbed brazilian coastal lagoon

Seasonal hydrochemical variation in a tropical coastal lagoon (Açu Lagoon, Brazil)

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