Observações biogeográficas e hidrobiológicas sôbre a lagôa de Maricá

Oliveira, Lejeune de; Nascimento, Rubem do; Krau, Luiza; Miranda, Arnaldo

doi:10.1590/s0074-02761955000200004

Cited by 24 publications

(16 citation statements)

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“…Values of dissolved oxygen recorded in SLS were higher than that found in other Rio de Janeiro lagoons such as Maricá (Oliveira et al, 1955;Guerra et al, 2011;Silva et al, 2014), Araruama (Debenay et al, 2001) and Itaipu lagoons . The values obtained in SLS indicated a favorable environment to the establishment of aerobic organisms of several trophic levels, since they require oxygen for their functions.…”

Section: Environmental Characterizationcontrasting

confidence: 65%

Assessment of the Trophic State of Saquarema Lagoonal System, Rio De Janeiro (Brazil)

et al. 2017

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Section: Environmental Characterizationcontrasting

confidence: 65%

Assessment of the Trophic State of Saquarema Lagoonal System, Rio De Janeiro (Brazil)

et al. 2017

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“…The MGLS has a circular shape and is inserted into a kind of deformed rocky amphitheater with its boundaries determined by the Atlantic Ocean and the Itacoatiara and Negra hills (Perrin, 1984). It is composed by four lagoons comprising a total area of 43.2 km 2 , which are currently distributed in: Maricá (20.5 km 2 ), Barra (11.7 km 2 ), Padre (1.6 km 2 ) and Guarapina (9.4 km 2 ) (Oliveira et al, 1955).…”

Section: Study Areamentioning

confidence: 99%

Organic Compounds as Proxies of the Sedimentary Environmental Quality of the Maricá-Guarapina Lagoon System (Se, Brazil)

et al. 2019

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Bottom sediment is a natural trap for organic matter and different kinds of pollutants. The accumulation of large amount of organic matter gives rise to the eutrophication of the aquatic ecosystems. The analyses of the quantity and quality of the organic matter (biopolymers) help to determine the trophic status of coastal ecosystems. The Maricá-Guarapina Lagoon System (MGLS) is located in Rio de Janeiro and is composed by four connected lagoons: Maricá, Barra, Padre and Guarapina. It has been suffering impacts due to the intense and uncontrolled property speculation. Based on this problem, this study aimed to characterize the organic matter (OM) amount and quality in sediments and the relation with the impacted areas in this lagoon system. The collected sediment samples were analyzed for geochemical data combined with grain size and physical-chemical environmental parameters of the bottom water. Statistical results evidenced that the sedimentary environment of the MGLS is heterogenous. The organic matter supplied to the MGLS is provided from different sources but the autochthonous contribution (phytoplanktonic productivity and vegetal detritus from the mangrove fringe) prevails. The anthropogenic contribution was more evident in Padre Lagoon, where the sediments had relatively low TOC contents (0.1-0.8%). The MGLS is accumulating mainly aged organic matter. The most impacted zones were found in Guarapina, Barra and Maricá lagoons, in bottoms of fine-grained sediments, with relatively high TOC and labile biopolymeric compounds (proteins, carbohydrates and lipids) contents, which should evolve into an ever-increasing stage of eutrophication. COMPOSTOS ORGÂNICOS USADOS COMO INDICADORES DA QUALIDADE AMBIENTAL SEDIMENTAR DO SISTEMA LAGUNAR MARICÁ-GUARAPINA (SE DO BRASIL)ResumoO sedimento de fundo constitui uma armadilha natural para a matéria orgânica e diferentes tipos de poluentes. O acúmulo de grande quantidade de matéria orgânica dá origem à eutrofização dos ecossistemas aquáticos. Estimativas de quantidade e qualidade da matéria orgânica (biopolímeros) podem ajudar a determinar o estado trófico dos ecossistemas costeiros. O Sistema Lagunar de Maricá-Guarapina (MGLS), localizado no Estado do Rio de Janeiro (SE do Brasil), é composto por quatro lagunas interconectadas: Maricá, Barra, Padre e Guarapina. Este sistema tem sofrido impactos devido à intensa e descontrolada especulação imobiliária. Neste contexto, este estudo teve como objetivo caracterizar a quantidade e qualidade de matéria orgânica (MO) dos sedimentos do MGLS. Foram obtidos dados geoquímicos e confrontados com resultados granulométricos em amostras de sedimentos coletados em 22 estações de amostragem e analisados parâmetros físico-químicos da água. Os resultados estatísticos evidenciaram que o ambiente sedimentar do MGLS é heterogêneo. Este sistema recebe matéria orgânica de diferentes fontes, sendo, porém, prevalecente a contribuição autóctone (produtividade fitoplanctônica e detritos vegetais dos manguezais existentes na região). A contribuição antropogênica de matéria orgânica foi mais evidente na Lagoa do Padre, onde os sedimentos apresentaram teores de COT relativamente baixos (0,1-0,8%). As zonas mais impactadas foram encontradas em fundos de sedimentos finos, com teores relativamente elevados de COT e de compostos biopoliméricos lábeis (proteínas, carboidratos e lipídios), nas lagunas de Guarapina, Barra e Maricá. Os resultados obtidos revelam também que o MGLS está acumulando principalmente matéria orgânica envelhecida e permitem prever que as referidas áreas podem evoluir para um estágio de cada vez maior grau de eutrofização.Palavras-chave: Lagunas Costeiras Tropicais. Biopolímeros. Eutrofização. Dinâmica Sedimentar.

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“…A study of this coast by OLIVEIRA et al (1955) had already raised a number of issues, such as problems related to flooding; frequent changes in the lagoon system, with the opening of channels and the release of raw sewage into the lagoons, causing a decrease in the fish population, as well as the problem of settlements resulting from increased land speculation at that time. The current situation in the region is one of abandonment, it being easy to find evidence of various aggressions to the environment, such as the illegal removal of sand, which is destroying the topography of the sand barriers; vehicles traversing the dunes and vegetated areas, destroying the local flora and fauna; illegal discharge of domestic waste; construction of houses and roads over restinga vegetation, causing deforestation; besides the constant action of criminals poaching wild animals (SILVA et al, 2014b).…”

Section: Study Areamentioning

confidence: 99%

Opal phytolith and isotopic studies of "Restinga" communities of Maricá, Brazil, as a modern reference for paleobiogeoclimatic reconstruction

Santos¹,

Coe

Borrelli

et al. 2015

Braz. j. oceanogr.

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Santos et al.: Opal phytoliths and isotopes Maricá restinga 255Opal phytolith and isotopic studies of "Restinga" communities of Maricá, Brazil, as a modern reference for paleobiogeoclimatic reconstructionThe Maricá restinga, located in the eastern part of the Rio de Janeiro State (Brazil), corresponds to one of the few remaining preserved areas of the state's coastal plain. This paper reports on a study of the Maricá restinga plant communities and also presents an identification of the main plant species present in each community, with the objective of establishing reference collections, by the methods of the proxies opal phytoliths and stable carbon isotopes, for paleoenvironmental reconstructions of this coastal area during the Quaternary. Six plant communities, distributed perpendicularly to the coast line over sandy barriers, lagoonal plain, lagoon margin and weathered basement were identified: halophile-psamophile, scrub, herbaceous swamp, slack, shrubby vegetation and dry forest. In general, the plant species analyzed in each community presented low productivity of opal phytoliths, as only the Poaceae, Cyperaceae and Arecaceae families produce a great amount and diversity of morphotypes of opal phytoliths. The results of the analysis of stable carbon isotopes in sediments indicated a predominance of C3 or a mixture of C3 and C4 plants, presenting a close correlation with the results found in plants collected in each community. In conclusion, it was verified that the carbon isotope analysis associated with that of the opal phytoliths are good proxies for the reconstruction of vegetation in the study area. A Restinga de Maricá, situada na porção leste do estado do Rio de Janeiro (Brasil), corresponde a uma das poucas áreas ainda preservadas na planície litorânea fluminense. Neste trabalho, apresentamos um estudo sobre as comunidades vegetais que compõem a restinga, bem como a identificação das principais espécies presentes em cada uma delas. O objetivo é estabelecer coleções de referência para reconstituições paleoambientais desse litoral durante o Quaternário. Para isso, utilizaram-se como métodos os indicadores fitóli-tos e isótopos estáveis de carbono. Foram identificadas seis comunidades vegetais distribuídas perpendicularmente à linha de costa sobre as barreiras arenosas, planície lagunar, margem lagunar e embasamento alterado: Halófila-psamó-fila, "Scrub", Brejo herbáceo, "Slack", Vegetação arbustiva e Floresta seca. As espécies de plantas analisadas em cada comunidade apresentaram em geral baixa produtividade de fitólitos. Somente as famílias Poaceae, Cyperaceae e Arecaceae produzem fitólitos em grandes quantidades e diversidade de morfotipos. Os resultados das análises de isótopos estáveis de carbono em sedimentos indicaram um predomínio de plantas C3 ou de mistura de plantas C3 e C4, apresentando uma boa correspondência com os resultados encontrados nas plantas coletadas sobre cada uma delas. Como conclusão, verificou-se que os isótopos de carbono associados às análises fitolíticas mostraram-se bons...

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Observações biogeográficas e hidrobiológicas sôbre a lagôa de Maricá

Cited by 24 publications

References 0 publications

Assessment of the Trophic State of Saquarema Lagoonal System, Rio De Janeiro (Brazil)

Assessment of the Trophic State of Saquarema Lagoonal System, Rio De Janeiro (Brazil)

Organic Compounds as Proxies of the Sedimentary Environmental Quality of the Maricá-Guarapina Lagoon System (Se, Brazil)

Opal phytolith and isotopic studies of "Restinga" communities of Maricá, Brazil, as a modern reference for paleobiogeoclimatic reconstruction

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