Fontes e distribuição de matéria orgânica sedimentar no complexo estuarino-lagunar de Mundaú-Manguaba/AL, utilizando esterois e alcoóis como indicadores

Ribeiro, Maria Antonia T. S. B; Knoppers, Bastiaan A.; Carreira, Renato S.

doi:10.1590/s0100-40422011000700002

Cited by 12 publications

(2 citation statements)

References 22 publications

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“…The TOC contents found in surficial soils of the present 6 Ratios between contents of organic C and pyritic S (C/S) for soils of the two coastal Blakes^in this study: site P1, lagoon 1, disconnected from the sea; sites P2 and P3, lagoon 2, connected to the sea. The C/S mass ratio of modern marine sediments is considered to be 2.8±1.5 (Berner and Raiswell 1983) study sites are lower than most reported by Zink et al (2004) and Ribeiro et al (2011) for other coastal lagoons along the Brazilian coast. This may be due to the semiarid climate of the present study region.…”

Section: Discussion and Conclusion Soil Characterizationcontrasting

confidence: 54%

Pyrite as a proxy for the identification of former coastal lagoons in semiarid NE Brazil

et al. 2015

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This work aimed to test the suitability of pyrite (FeS 2 ) as a proxy for reconstructing past marine environmental conditions along the semiarid coast of Brazil. Morphological description combined with physicochemical analyses including Fe partitioning were conducted for soil depth profiles (30 and 60 cm depths) at three sites in two contrasting lagoons of the state of Ceará: a suspected former lagoon that would have been transformed into a freshwater Blake^at a site vegetated by Juncus effusus (site P1), and another lagoon with connection to the sea at sites vegetated by J. effusus (site P2) or Portulaca oleracea (site P3). Soil samples were collected in September 2010. Site P3 had more reducing conditions, reaching Eh values of -132 mV in the surface layer (0-10 cm), whereas minimum values for the P1 and P2 sites were +219 and +85 mV, respectively. Lower pyritic Fe values were found at site P1, with a degree of pyritization (DOP) ranging from 10 to 13%. At sites P2 and P3, DOP ranged from 9 to 67% and from 55 to 72%, respectively. These results are consistent with an interruption of tidal channels by eolian dune migration inducing strong changes in the hydrodynamics and physicochemical characteristics (lower salinity, oxidizing conditions) of these sites, causing the dieback of suspected former mangroves and a succession to freshwater marshes with an intermediate salt marsh stage. Together with other physicochemical signatures, pyrite can evidently serve as a useful proxy in tracking environmental changes in such ecotones, with implications for coastal management.

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Section: Discussion and Conclusion Soil Characterizationcontrasting

confidence: 54%

Pyrite as a proxy for the identification of former coastal lagoons in semiarid NE Brazil

et al. 2015

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“…These sterols are representative of different OM sources; β -sitosterol is one of the major sterols found in higher plants, whereas cholesterol is generally attributed to both zooplankton and phytoplankton (autochthonous OM) [ 24 – 26 ]. Although β -sitosterol is used as a biomarker of terrestrial OM in several geochemical studies, some authors also suggest the possibility of its origin from phytoplankton or even aquatic macrophytes [ 24 , 27 ]. The relative contribution of these sources depends on both the studied environment and influence of such different OM sources.…”

Section: Resultsmentioning

confidence: 99%

Quantification of Sterol and Triterpenol Biomarkers in Sediments of the Cananéia-Iguape Estuarine-Lagoonal System (Brazil) by UHPLC-MS/MS

Bataglion

Koolen

Weber

et al. 2016

International Journal of Analytical Chemistry

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Sterols and triterpenols present in sedimentary cores from 12 stations along the Cananéia-Iguape estuarine-lagoonal system were investigated by ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS). Ten sterols and three triterpenols were identified and quantified, indicating both natural and anthropogenic sources. The relative distributions of sterol and triterpenol showed that the study area is submitted to organic matter (OM) from the Ribeira de Iguape River, seawater, surrounding vegetation, and plankton production. The contribution of these sources depends on the region of the estuarine-lagoonal system and the depth of sediment. Regarding anthropogenic sources, only the samples submitted to freshwater flow from the Ribeira de Iguape River presented concentration of coprostanol higher than the threshold value and diagnostic ratios, coprostanol/(coprostanol + cholestanol) and coprostanol/cholesterol, that indicate moderate contamination by domestic sewage in that area of the estuarine-lagoonal system. Therefore, the approach used herein identified the OM sources and its transport along the Cananéia-Iguape estuarine-lagoonal system (Brazil), which is a complex of lagoonal channels located in a United Nations Educational, Scientific and Cultural Organization (UNESCO) Biosphere Reserve.

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Coastal freshwater stream fish fauna from a threatened estuarine lagoon complex in northeastern Brazil

da Silva,

Pérez-Mayorga,

Romero

2023

Environ Biol Fish

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Fontes e distribuição de matéria orgânica sedimentar no complexo estuarino-lagunar de Mundaú-Manguaba/AL, utilizando esterois e alcoóis como indicadores

Cited by 12 publications

References 22 publications

Pyrite as a proxy for the identification of former coastal lagoons in semiarid NE Brazil

Pyrite as a proxy for the identification of former coastal lagoons in semiarid NE Brazil

Quantification of Sterol and Triterpenol Biomarkers in Sediments of the Cananéia-Iguape Estuarine-Lagoonal System (Brazil) by UHPLC-MS/MS

Coastal freshwater stream fish fauna from a threatened estuarine lagoon complex in northeastern Brazil

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