Caracterização química e aspectos geoquímicos relevantes da matéria orgânica de sedimentos em suspensão na foz do rio Amazonas

Pereira, Simone Baía; Lima, Waterloo Napoleão de; El-Robrini, Maâmar

doi:10.5123/s1981-81142006000100012

Cited by 3 publications

(3 citation statements)

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“…The organic carbon occurs in coastal aquatic ecosystems as part of the biomass, detritic (usually bioclastic) and in dissolved form (Pereira et al, 2006). Increased levels of organic carbon in the intermediate sector may be associated with a greater biomass of mollusks and echinoderms, which are the main producers of carbonates of benthic macrofauna (Brusca & Brusca, 2007).…”

Section: Discussionmentioning

confidence: 99%

Influence of environmental variables on the distribution of intertidal porcellanid crabs in Sepetiba Bay, Rio de Janeiro, Brazil

Mattos¹,

Mendes²,

Bedê³

et al. 2014

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ABSTRACT. This study aims to assess the distribution patterns of porcellanid crabs in the intertidal zone of Sepetiba Bay, Rio de Janeiro, Brazil, identifying the abiotic determinants. Samples were collected seasonally (dry and rainy seasons) from January 2005 to August 2007, during low tides in external, intermediate and internal sectors. The crabs were hand caught in consolidated substrates with sampling effort of two people in three different flood zones (lower, medium and higher) for 30 min. Water temperature, salinity, accumulated rainfall, the physical and chemical variables of sediment were analyzed concerning interaction in the distribution patterns of the species. A total of 3,389 crabs, belonging to five genera and eight species, were obtained. With the exception of Petrolisthes armatus, found throughout the intertidal range, all species inhabited the intertidal bottom of Sepetiba Bay exclusively. Favorable environmental conditions of the Sepetiba Bay enabled the success of colonization of several porcellanid species which are a refuge and feeding environment of the Marambaia Island and continental (Junqueira and Ibicuí) of the outer zone. The number of species recorded in this study supporting the hypothesis that features of substratum and the availability of food and refuges are factors limiting the establishment of this family in Sepetiba Bay. Keywords: porcellanids, crustaceans, intertidal zone, organic matter, sediments, Sepetiba Bay, Brazil.Influencia de las variables ambientales sobre la distribución de cangrejos porcelánidos de la zona intermareal de la Bahía de Sepetiba, Rio de Janeiro, Brasil RESUMEN. Este estudio tiene como objetivo evaluar los patrones de distribución de cangrejos porcelánidos y sus determinantes abióticos en la zona intermareal de la Bahía de Sepetiba, Río de Janeiro, Brasil. El muestreo se realizó estacionalmente (temporadas secas y lluviosas) entre enero de 2005 y agosto de 2007, durante las mareas bajas en sectores externos, intermedios e internos. Los cangrejos fueron capturados manualmente en sustratos consolidados con dos colectores en tres diferentes zonas de inundación (inferior, medio y superior) por 30 min. Se analizó la temperatura del agua, salinidad, precipitación acumulada y parámetros físicos y químicos de los sedimentos para estudiar la interacción en los patrones de distribución de las especies. Durante el período se analizaron 3.389 ejemplares pertenecientes a cinco géneros y ocho especies de crustáceos de porcelánidos. Con excepción de P. armatus, que se encontró en toda la zona intermareal, las demás especies habitaron exclusivamente el intermareal inferior de la Bahía de Sepetiba. Diversas especies de porcelánidos encuentran refugio y alimentación en el medio ambiente de la isla Marambaia y en la parte continental (Junqueira and Ibicuí) perteneciente a la zona externa de la Bahía de Sepetiba. El número de especies registradas en este estudio apoya las hipótesis que las características del sustrato, disponibilidad de alimentos y refugios son factores qu...

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Section: Discussionmentioning

confidence: 99%

Influence of environmental variables on the distribution of intertidal porcellanid crabs in Sepetiba Bay, Rio de Janeiro, Brazil

Mattos¹,

Mendes²,

Bedê³

et al. 2014

lajar

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“…Suspended matter can be considered an influence to TA communities in aquatic environments, since it is mostly composed of minerals used in the test construction (Pereira et al 2006, Du Châtelet et al 2010. In a lake with high levels of calcite, the species Difflugia limnetica replaced the sand grains on its carapace for calcite grains (Casper and Schonborn 1985), being considered a good indicator of calcite precipitation in lakes (Casper and Schonborn 1985).…”

Section: Organic Matter Ph and Nutrientsmentioning

confidence: 99%

Testate amoebae: a review on their multiple uses as bioindicators

et al. 2022

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Testate amoebae (TA) are unicellular protozoans enclosed in a test capable of indicating a wide variety of environmental conditions. Among others, characteristics such as short life cycle, great sensitivity and worldwide distribution makes them adequate bioindicators. As a complement to physical and chemical measurements, biomonitoring can be a cheaper and fastest way of environmental monitoring. This research sought to evaluate the extent of TA use in biomonitoring and the responses given by them to environmental features. The research was conducted in Scielo, Science Direct, Online Library, Google Scholar and Capes Journal Portal and yielded 211 papers. TA bioindication is able to provide information on metal, trace element and atmospheric pollution, and to point out different trophic states, pH, and evidence on characteristics of hydrology. Further, TA can be used in paleoenvironmental reconstruction as they reflect climate, volcanic and even sea level change phenomena. Sometimes, together with other organisms in environmental analysis, they have shown to be an important complement to biomonitoring. Additionally, a functional traits approach has been recently included as a promising tool. Methodological adjustments that have been conducted throughout the years are allowing TA use to be more reliable and precise. This review provides insight on the many possible functions of TA in bioindication studies, highlighting their wide use as bioindicators.

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“…Há 469, 537, 694, 779 e 913 cm -1 são indicativas de materiais inorgânicos, como argila e quartzo e, a vibração a 1636 cm -1 , pode ser atribuída a vibrações de C=O de carboxilatos e aromáticos segundoHaberhauer et al (2000). As bandas de estiramento Si-O, se estendem de 1000 a 1200 cm -1 , onde seu dobramento mais significativo está em 1033 e 1103 cm -1 e, a presença de fraca absorção no intervalo de 2930 a 2850 cm ˉ¹ refere-se aos grupos metileno -CH 2 -de hidrocarbonetos reportado porPereira et al (2006).…”

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