8 documents found, page 1 of 1

Trace metals in mangrove seedlings: role of iron plaque formation

Metal-rich mineral deposits on the roots of aquatic plants, denominated iron plaques, may moderate the uptake of essential, but potentially toxic metals by roots. We investigated the iron plaque formation on the fine, nutritive roots of mangrove seedlings growing in contrasting environments (oxidizing sand flat sediments and reducing mangrove forest sediments) in southeast Brazil. The results indicate that Avic...

Mercury accumulation in sediments of a mangrove ecosystem in SE Brazil

The Hg accumulation in sedimentary environments of a mangrove ecosystem in Sepetiba Bay, SE Brazil, was investigated. These environments include sediments of a mangrove forest, the main tidal creek that drains the forest, and the bare seaward-edge mud flat adjacent to forest and tidal creek. Maximum Hg concentration peaks in sediments from the mud flat (184 ng g−1), tidal creek (98 ng g−1), and mangrove forest ...

Manganese behavior at the sediment-water interface in a mangrove dominated area...

We investigated the behavior of Mn in intertidal environments in a mangrove dominated area in Sepetiba Bay, southeast Brazil, to characterize the contribution of diagenetic remobilization to the Mn cycling and bioavailability near the sediment-water interface. Sediment cores and pore water were collected in a mixed mangrove forest and in adjacent unvegetated mud and sand flats, during the rain season (November ...

Mercury, zinc, and copper accumulation in mangrove sediments surrounding a larg...

The accumulation of Hg, Zn, and Cu was evaluated in mangrove sediments located between a large, 20-years-old landfill and waters of Guanabara Bay (southeast Brazil). The contamination history of the area provides substantial evidence that metal accu- mulation in the study site is influenced by past metal emissions from multiple sources (e.g. contaminated rivers and the landfill surrounding the site). At the sou...

Trace metal retention in mangrove ecosystems in Guanabara Bay, SE Brazil

Along contrasting environmental conditions (e.g., degree of trace metal contamination and mangrove forest structural devel- opment), sediments of Laguncularia racemosa-dominated mangrove stands in Guanabara Bay (SE Brazil) presented a trend of trace metal accumulation in forms with low potential of remobilization and biotic uptake. Concurrently, a relatively low transfer of sediment-bound metals to L. racemosa ...

Comportamento do cobre em sedimentos de área degradada de manguezal avaliado po...

Seagrass losses concerns: does sediment metal pollution matter?

eagrass losses result in the lost of well-known environmental services (e.g. nutrient retention and habitat functions). A potential additional loss is the enhanced trace metal retention capacity of sediments colonized by seagrasses. A preliminary study within a coastal lagoon in SE Brazil showed that upper layers of sediments colonized by the seagrass Ruppia maritimapresented significantly higher reactive conce...

Sediment contamination and toxicity of Marine Protected Areas in southeastern B...

Made available in DSpace on 2021-06-25T10:32:42Z (GMT). No. of bitstreams: 0 Previous issue date: 2021-09-01; Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Recent studies have shown that the effectiveness of establishing Marine Protected Areas (MPAs) is thre...