Navegando por Assunto "Mangue"

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Caracterização estrutural do bosque de mangue urbano no rio Fragoso na Região Metropolitana do Recife, Pernambuco, Brasil
(2025-08-08) Bandeira, João Pedro Serpa; Magalhães, Karine Matos; Coelho Júnior, Clemente; http://lattes.cnpq.br/1556412540089666; http://lattes.cnpq.br/1529606079794689; http://lattes.cnpq.br/8881102185822248
Manguezal é um ecossistema localizado na zona costeira tropical e subtropical, o qual apresenta influência direta das marés, além de possuir características específicas como solo lodoso e plantas adaptadas a essas condições. São responsáveis por fornecer vários serviços ecossistêmicos, além de proporcionar condições essenciais para reprodução, alimentação e abrigo para os animais que circundam e vivem no manguezal. O estudo foi desenvolvido no remanescente de mangue localizado no rio Fragoso, município de Olinda-PE, onde ocorre uma pressão urbana iminente. Possui objetivo principal a caracterização estrutural do bosque a qual se enquadra a metodologia de parcelas, onde foram analisadas as variáveis: área basal, densidade de indivíduos/troncos e altura média e altura do dossel. No referido bosque de mangue do rio Fragoso foram registradas as espécies Avicennia schaueriana, Laguncularia racemosa e Rhizophora mangle. Referente ao quantitativo das espécies arbóreas, o bosque se apresentou como misto, mas com dominância de L. racemosa. Quanto às variáveis analisadas, árvores com DAP mostrou-se > 10 foram dominantes, caracterizando um bosque maduro, com área basal de 15,07 a 35,13 m2/ha, altura média do bosque de 6,5 a 8,2 m, altura média do dossel 7,74 a 13,04 m, densidade de indivíduos de 933,38 a 1700 por hectare, densidade de troncos entre 5250 a 5800,29 por hectare. Por fim, esses resultados indicam que o mangue é estruturalmente maduro, com boa regeneração, mesmo diante dos impactos.
Disponibilidade ambiental e risco ecológico de metais pesados em solos de diferentes posições fisiográficas de manguezal
(2022-10-07) Silva, Suellayne Correia Valério da; Biondi, Caroline Miranda; Araújo, Paula Renata Muniz; http://lattes.cnpq.br/1779598476646308; http://lattes.cnpq.br/8326756664758702; http://lattes.cnpq.br/1266535065976270
Mangrove soils are considered geochemical filters due to their great capacity to retain heavy metals. The level of contamination of these soils can be assessed by the environmentally available levels of heavy metals and the ecological risk. With this, the work aimed to evaluate the levels of heavy metals based on the 3051A analysis, comparing with regional and international reference levels, as well as estimating the ecological risk in areas of different physiographic positions of the Botafogo mangrove. Soil samples were collected (0-40 cm) along two transects (T1 and T2) at distances of 0, 60, 120 and 180 meters from the bank of the Botafogo River. In the field, pH and Eh were determined in sections 0 to 5, 5 to 10, 10 to 20, 20 to 30 and 30 to 40 cm of the collected soils. In the laboratory, the samples were prepared for granulometric, organic matter (MOS) and heavy metal analysis. Metal contents were determined in ICP-OES after 3051A acid digestion of soil samples. Descriptive statistics were adopted for all variables evaluated. The pH values of the evaluated areas indicated slightly acidic to neutral soils; while the values of Eh, suboxic to anoxic environments. There was a predominance of clayey soils and high levels of SOM in T1; sandy soils predominated in T2. In general, the average levels of heavy metals in T1 were higher than in T2, and exceeded regional backgrounds. Only Cr and Cu showed levels above the Threshold Effect Level (TEL), indicating possible adverse effects on the biota. The distribution of metals in the transects varied as a function of clay and SOM contents, as verified in the positive and significant correlations between metals and clay, and between metals and SOM. Ecological risk coefficients (Ei) were higher at T1 when compared to T2, but all Ei were below 40, indicating low risk. The Potential Ecological Risk (PER), considering the effect of the set of metals, was below 150, showing that the presence of metals in mangrove forests does not offer high ecological risks.
Isolamento de bactérias hidrocarbonoclásticas de sedimento de manguezal contaminado com petróleo
(2022-05-25) Paula, Nazareth Zimiani de; Lima, Marcos Antônio Barbosa de; http://lattes.cnpq.br/3887006042216258; http://lattes.cnpq.br/9977163727403212
In August of 2019, there was a petrol leakage which hit the shore of 11 states of the northeast and southeast of Brazil. This leakage affected several coastal ecosystems mainly estuary and mangrove forests, besides exposing coastal species already under threat. Mangrove forests are ecosystems extremely sensitive to contamination by hydrocarbons. Therefore, this present proposal has aimed at isolating and featuring hydrocarbonclastic bacteria with degradation potential in sediment of mangrove, contaminated by petrol, in Cabo de Santo Agostinho. To do so, samples of superficial sediments of mangrove which were contaminated, those were collected and submitted to the tests of quantification of total heterotrophic bacteria, assertiveness of hydrocarbonclastic bacteria, selection of isolated decomposers of petrol and by-products. The physical- chemical pH parameters, temperature, salinity, and conductivity were also measured in the sediment. It was not observed significant variation in the physical-chemical parameters among the variables analysed. On the other hand, It was obtained a total of 30 bacterial isolates, 15 heterotrophic and 15 hydrocarbonclastic bacteria. Negative Gram bacilli were predominant among heterotrophic and hydrocarbonclastic bacteria. Two isolated ones, the group of heterotrophic bacteria stood out. (isolated 1 & 4) due to showing more relative frequency, making up of 64 % of total isolated together. With regards to the 15 isolate hydrocarbonclastic bacteria, 13 of those, were obtained in the diesel oil environment as source for carbon. Of 15 isolate hydrocarbonclastic bacteria assessed, 10 displayed potential for decomposition of diesel oil, gasoline and kerosene. The isolate 7 was prominent as it achieved the best decomposition results of the 3 fuels analysed.
Relatório final de atividades do Estágio Supervisionado Obrigatório: seleção de bactérias com potencial de utilização em processo de biorremediação de solos contaminados por mercúrio
(2025) Oliveira, Jennifer Nicoli de Souza; Biondi, Caroline Miranda; http://lattes.cnpq.br/8326756664758702; http://lattes.cnpq.br/1940730909264239
Os manguezais desempenham um papel crucial na ecologia, manutenção da qualidade da água, biodiversidade e estabilidade dos solos. No entanto, a contaminação por metais pesados, como o mercúrio (Hg), tem se mostrado um problema decorrente das atividades industriais. Atualmente tem se buscado formas de recuperar essas áreas contaminadas por Hg, sendo a biorremediação microbiana uma alternativa promissora para recuperação dessas áreas, pois utiliza de bactérias indígenas, resistentes ao Hg capazes de volatilizá-lo. Por isso, objetivou-se neste trabalho avaliar a eficiência de bactérias indígenas de solo contaminado por Hg no estuário do Rio Botafogo, para uso em processos de biorremediação. Foram coletadas amostras de solo do estuário do Rio Botafogo, em Pernambuco, divididas em P1 e P2, e isoladas bactérias dessas amostras. Foram realizados testes como o de Concentração inibitória mínima (CIM) para avaliar a capacidade das bactérias em resistir ao mercúrio. Os resultados indicaram que os solos do estuário estão contaminados por Hg em concentrações de 4,28 a 10,42 mg kg-1 e que há a presença de isolados dos gêneros Enterococcus, Bacillus e Pseudomonas, que possuem resistência de 50 a 100 mg L-1 de Hg, de acordo com o teste CIM. Essas bactérias apresentam potencial para serem utilizadas em processos de biorremediação. Além disso, o solo do manguezal do estuário do Rio Botafogo apresentou pH próximo à neutralidade e potencial redox indicando ambiente anóxico.
Teores de cádmio e chumbo em solos sob manguezais de Pernambuco
(2019-07) Ferreira, Djennyfer Karolaine de Melo; Biondi, Caroline Miranda; http://lattes.cnpq.br/8326756664758702; http://lattes.cnpq.br/9195964705467745
Teores de mercúrio total e estimativa de risco à saúde humana em solos de manguezal contaminados por indústria de soda-cloro
(2024-02-26) Silva Neto, José Carlos da; Biondi, Caroline Miranda; Araújo, Paula Renata Muniz; http://lattes.cnpq.br/1779598476646308; http://lattes.cnpq.br/8326756664758702; http://lattes.cnpq.br/5393117310370821
The Botafogo River estuary is located between the cities of Goiana and Itapissuma, coastal area of Pernambuco, and is the most relevant water resource among the coastal rivers that border the region, being responsible for the main water reservoir used to supply the local population. However, the activity of a chlor-alkali plant established close to the mangrove in the 1960s brought effluents containing Hg into the river, presenting potential for contamination in areas of mangrove forests, which could interfere with the health of the mangrove ecosystem and the community. This work aimed to evaluate the total Hg levels, relate them to the granulometry and chemical attributes of the soils and estimate the risk to human health in soils from two transects, located in different physiographic positions of the Botafogo River mangrove. For this, 3 soil profiles (0-40 cm) were collected at distances 0, 60, 120 and 180 meters from the margin of each transect during periods of low tide. The profiles were sectioned at depths 0-5, 5-10, 10-20, 20-30 and 30-40 cm and the particle size fractions, organic matter, pH, Eh and total Hg were determined. Based on the Hg results in the soils, the non-carcinogenic risk to human health was estimated. The pH and Eh values indicated slightly acidic to neutral soils and suboxic to anoxic environments, respectively, representing favorable conditions for Hg retention. Clay content predominated in the soils of Transect 1 (T1), while the sand fraction predominated in Transect 2 (T2). SOM values ranged from 144 to 424 g kg-1, with higher levels in the T1 profiles. Average Hg levels ranged from 0.2 to 15.3 mg.kg-1 in T1 and from 0.0 to 7.4 mg.kg-1 in T2. The Hg contents in T1 were higher compared to T2, possibly due to the position of the transect in the landscape and the greater accumulation of clay and OM, corroborated by the positive and significant correlations between Hg and clay, and between Hg and OM. When comparing the Hg values found with international reference levels, maximum Hg values were found to be up to 102 times higher than the international reference value TEL (Threshold Effect Level) and 15 times the PEL (Probable Effects Level). About 82% of samples exceeded the PEL, indicating that toxic effects on biota are likely. The health risk for children was greater than that for adults because they are organisms more sensitive to the toxicity of the metal. The main route of exposure was inhalation of Hg vapor. Contamination of soils in the Botafogo River estuary reached mangrove forest areas, highlighting the widespread Hg contamination in the area. The areas most contaminated by the metal pose risks to the riverside community.