scholarly journals METAL SORPTION BY SEDIMENTS FROM A MANGROVE REFORESTATION AREA IN GUANABARA BAY (SE BRAZIL) REVEALED BY USING RADIOTRACERS

2016 ◽  
Vol 1 (3) ◽  
Author(s):  
Katia Noriko Suzuki ◽  
Melissa Nogueira Sondermann ◽  
Edimar Carvalho Machado ◽  
Wilson Machado ◽  
Alfredo Victor Bernedo Bellido ◽  
...  
Keyword(s):  
Guanabara Bay ◽  
Metal Sorption ◽  
Se Brazil ◽  
Mangrove Reforestation

Bulk, isotopic, petrographic organic matter and mineral distribution as proxies of environmental process in Guanabara Bay, SE, Brazil

2021 ◽  
Vol 41 (3) ◽  
Author(s):  
R. C. Cordeiro ◽  
D. D. dos Santos ◽  
R. E. Santelli ◽  
A. G. Figueiredo ◽  
L. S. Moreira ◽  
...  
Keyword(s):  
Organic Matter ◽  
Guanabara Bay ◽  
Mineral Distribution ◽  
Se Brazil ◽  
Environmental Process

scholarly journals Small time scale plankton structure variations at the entrance of a tropical eutrophic bay (Guanabara Bay, Brazil)

2012 ◽  
Vol 60 (4) ◽  
pp. 405-414 ◽  
Author(s):  
Mariana Guenther ◽  
Isabel Lima ◽  
Glenda Mugrabe ◽  
Denise Rivera Tenenbaum ◽  
Eliane Gonzalez-Rodriguez ◽  
...  
Keyword(s):  
Surface Layer ◽  
Photosynthetic Efficiency ◽  
Great Influence ◽  
Small Time ◽  
Guanabara Bay ◽  
Short Term ◽  
Mesozooplankton Biomass ◽  
Trophic Pathways ◽  
Se Brazil ◽  
Almost All

The dynamics of the plankton compartments at the entrance of Guanabara Bay (SE Brazil) were assessed during a short-term temporal survey to estimate their trophic correlations. Size-fractioned phytoplankton (picoplankton: < 2µm, nanoplankton: 2-20µm and microplankton: > 20µm) biomass and photosynthetic efficiency, composition and abundance of the auto-and heterotrophic nano-and microplankton, and mesozooplankton were evaluated at a fixed station for 3 consecutive days at 3-h intervals, in the surface and bottom (20m) layers. The variability of almost all plankton compartments in the surface layer was directly dependent on temperature, indicating the great influence of the circulation at the entrance of the bay on plankton structure. In the surface layer, the mesozooplankton seems to be sustained by both autotrophic nano-and picoplankton, this last being channeled through the microzooplankton. Near the bottom, both auto-and heterotrophic microplankton are probably supporting the mesozooplankton biomass. Our findings thus suggest that the entrance of Guanabara bay presents a multivorous food web, i.e., a combination of both grazing and microbial trophic pathways.

Eutrophication history of Guanabara Bay (SE Brazil) recorded by phosphorus flux to sediments from a degraded mangrove area

2009 ◽  
Vol 58 (11) ◽  
pp. 1750-1754 ◽  
Author(s):  
A.C. Borges ◽  
C.J. Sanders ◽  
H.L.R. Santos ◽  
D.R. Araripe ◽  
W. Machado ◽  
...  
Keyword(s):  
Guanabara Bay ◽  
Mangrove Area ◽  
Se Brazil ◽  
Phosphorus Flux ◽  
History Of

Pb isotope signatures of sediments from Guanabara Bay, SE Brazil: Evidence for multiple anthropogenic sources

2006 ◽  
Vol 88 (1-3) ◽  
pp. 384-388 ◽  
Author(s):  
M.C. Geraldes ◽  
A.H. Paula ◽  
J.M. Godoy ◽  
C.M. Valeriano
Keyword(s):  
Anthropogenic Sources ◽  
Guanabara Bay ◽  
Pb Isotope ◽  
Se Brazil

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

2002 ◽  
Vol 44 (11) ◽  
pp. 1277-1280 ◽  
Author(s):  
W Machado ◽  
E.V Silva-Filho ◽  
R.R Oliveira ◽  
L.D Lacerda
Keyword(s):  
Trace Metal ◽  
Guanabara Bay ◽  
Metal Retention ◽  
Mangrove Ecosystems ◽  
Se Brazil

Late Holocene evolution and increasing pollution in Guanabara Bay, Rio de Janeiro, SE Brazil

2014 ◽  
Vol 79 (1-2) ◽  
pp. 175-187 ◽  
Author(s):  
Claudia Gutterres Vilela ◽  
Brígida Orioli Figueira ◽  
Mariana Cardoso Macedo ◽  
José Antonio Baptista Neto
Keyword(s):  
Rio De Janeiro ◽  
Late Holocene ◽  
Guanabara Bay ◽  
Se Brazil

scholarly journals Origin of salinity and hydrogeochemical features of porous aquifers from northeastern Guanabara Bay, Rio de Janeiro, SE - Brazil

2019 ◽  
Vol 22 ◽  
pp. 100601
Author(s):  
Olga V.O. Gomes ◽  
Eduardo D. Marques ◽  
Vinicius T. Kütter ◽  
José R. Aires ◽  
Yves Travi ◽  
...  
Keyword(s):  
Rio De Janeiro ◽  
Guanabara Bay ◽  
Se Brazil ◽  
Porous Aquifers

Environmental change in Guanabara Bay, SE Brazil, based in microfaunal, pollen and geochemical proxies in sedimentary cores

2017 ◽  
Vol 143 ◽  
pp. 4-15 ◽  
Author(s):  
José Antônio Baptista Neto ◽  
Cintia Ferreira Barreto ◽  
Claudia Gutterres Vilela ◽  
Estefan Monteiro da Fonseca ◽  
Gustavo Vaz Melo ◽  
...  
Keyword(s):  
Environmental Change ◽  
Guanabara Bay ◽  
Geochemical Proxies ◽  
Se Brazil

scholarly journals A large CO<sub>2</sub> sink enhanced by eutrophication in a tropical coastal embayment (Guanabara Bay, Rio de Janeiro, Brazil)

2015 ◽  
Vol 12 (6) ◽  
pp. 4671-4720 ◽  
Author(s):  
L. C. Cotovicz ◽  
B. A. Knoppers ◽  
N. Brandini ◽  
S. J. Costa Santos ◽  
G. Abril
Keyword(s):  
Rio De Janeiro ◽  
Thermal Stratification ◽  
Carbon Sink ◽  
Atmospheric Co2 ◽  
Guanabara Bay ◽  
Small Surface ◽  
Tropical Regions ◽  
Chl A ◽  
Se Brazil ◽  
Organic Carbon Burial

Abstract. In contrast to its small surface area, the coastal zone plays a disproportionate role in the global carbon cycle. Carbon production, transformation, emission and burial rates at the land–ocean interface are still poorly known, especially in tropical regions. Surface water pCO2 and ancillary parameters were monitored during nine field campaigns between April 2013 and April 2014 in Guanabara Bay, a tropical eutrophic to hypertrophic semi-enclosed estuarine embayment surrounded by the city of Rio de Janeiro, SE-Brazil. Water pCO2 varied between 22 and 3715 ppmv in the Bay showing spatial, diurnal and seasonal trends that mirrored those of dissolved oxygen (DO) and Chlorophyll a (Chl a). Marked pCO2 undersaturation was prevalent in the shallow, confined and thermally stratified waters of the upper bay, whereas pCO2 oversaturation was restricted to sites close to the small river mouths and small sewage channels, which covered only 10% of the bay's area. Substantial daily variations in pCO2 (up to 395 ppmv between dawn and dusk) were also registered and could be integrated temporally and spatially for the establishment of net diurnal, seasonal and annual CO2 fluxes. In contrast to other estuaries worldwide, Guanabara Bay behaved as a net sink of atmospheric CO2, a property enhanced by the concomitant effects of strong radiation intensity, thermal stratification, and high availability of nutrients, which promotes phytoplankton development and net autotrophy. In the inner part of the bay, the calculated annual CO2 sink (−19.6 mol C m2 yr-1) matched the organic carbon burial in the sediments reported in the literature. The carbon sink and autotrophy of Guanabara Bay was driven by planktonic primary production promoted by eutrophication, and by its typology of marine embayment lacking the classical extended estuarine mixing zone, in contrast to river-dominated estuarine systems, which are generally net heterotrophic and CO2 emitters. Our results show that global CO2 budgetary assertions still lack information on tropical estuarine embayments and lagoons, which are affected by thermal stratification and eutrophication and behave specifically with respect to atmospheric CO2.

Assessment of human effects through phosphorus partitioning in sediments from two catchment basins around Guanabara Bay, SE Brazil

2016 ◽  
Vol 75 (17) ◽  
Author(s):  
Carlos Marclei Arruda Rangel ◽  
José Antônio Baptista Neto ◽  
Priscilla Soares de Oliveira ◽  
Luciana Gomes Lima ◽  
Estefan Monteiro da Fonseca
Keyword(s):  
Guanabara Bay ◽  
Se Brazil ◽  
Human Effects ◽  
Phosphorus Partitioning
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