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  1. Article ; Online: Global assessment of coralline algae mineralogy points to high vulnerability of Southwestern Atlantic reefs and rhodolith beds to ocean acidification.

    de Carvalho, Rodrigo Tomazetto / Rocha, Gustavo Miranda / Karez, Claudia Santiago / da Gama Bahia, Ricardo / Pereira, Renato Crespo / Bastos, Alex Cardoso / Salgado, Leonardo Tavares

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 9589

    Abstract: Coralline algae constitute one of the main groups of highly vulnerable calcified benthic organisms to ocean acidification. Although damaging effects of seawater acidification on the coralline algae skeleton have been widely demonstrated, the ... ...

    Abstract Coralline algae constitute one of the main groups of highly vulnerable calcified benthic organisms to ocean acidification. Although damaging effects of seawater acidification on the coralline algae skeleton have been widely demonstrated, the susceptibility to dissolution varies according to the Mg
    MeSH term(s) Atlantic Ocean ; Calcium Carbonate ; Hydrogen-Ion Concentration ; Rhodophyta ; Seawater
    Chemical Substances Calcium Carbonate (H0G9379FGK)
    Language English
    Publishing date 2022-06-10
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-13731-y
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  2. Article ; Online: Bioavailability and ecological risks of trace metals in bottom sediments from Doce river continental shelf before and after the biggest environmental disaster in Brazil: The collapse of the Fundão dam.

    Aguiar, Valquíria Maria de Carvalho / Neto, José Antônio Baptista / Quaresma, Valéria da Silva / Bastos, Alex Cardoso / Athayde, João Pedro Moreno de

    Journal of environmental management

    2020  Volume 272, Page(s) 111086

    Abstract: The present study deals with bioavailability of trace metals in the Doce river continental shelf, southeast of Brazil. The bottom sediments of the study area were firstly sampled a few weeks before the biggest environmental disaster of Brazil, the ... ...

    Abstract The present study deals with bioavailability of trace metals in the Doce river continental shelf, southeast of Brazil. The bottom sediments of the study area were firstly sampled a few weeks before the biggest environmental disaster of Brazil, the collapse of the Fundão dam in November of 2015. The disaster released around 40 Mm
    MeSH term(s) Biological Availability ; Brazil ; Disasters ; Environmental Monitoring ; Geologic Sediments ; Metals, Heavy/analysis ; Risk Assessment ; Rivers ; Water Pollutants, Chemical/analysis
    Chemical Substances Metals, Heavy ; Water Pollutants, Chemical
    Language English
    Publishing date 2020-07-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2020.111086
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  3. Article: The Holocene Palaeoenvironmental Evolution of Vitória Bay, Espírito Santo, Brazil

    Freitas, Alex da Silva de / Barreto, Cintia Ferreira / Bastos, Alex Cardoso / Neto, José Antônio Baptista

    Palynology. 2019 July 8, v. 43, no. 3

    2019  

    Abstract: Micropalaeontological analyses of two sediment cores (T_A and T_D) collected from a tropical bay in Brazil were conducted. Continental palynomorphs and carbonised particle data were associated with stable isotopes (C and N) assessed using 14C dating. The ...

    Abstract Micropalaeontological analyses of two sediment cores (T_A and T_D) collected from a tropical bay in Brazil were conducted. Continental palynomorphs and carbonised particle data were associated with stable isotopes (C and N) assessed using 14C dating. The main objective was to integrate these data with the results of isotopic analyses in order to establish the palaeoenvironmental dynamics of the area during the Holocene. The samples were sub-sampled every 10 cm and then submitted for standard methodological processing for each analysis. The T_A sediment core was dated at three depths, and the oldest depth, 150 cm, had an age between 7241-7339 cal yr BP. The T_D sediment core had an age between 6778 and6948 cal yr BP at its deepest depth, 370 cm. Using radiocarbon dating and micropalaeontological analyses, the integrated assessment of the two sediment cores indicated that the core with a coarser granulometry core was a continuation of the core with the finest granulometry. Consequently, both the lithological change and the preservation of the microfossils could be directly related to periods of sea level variations observed in the coastal region of Brazil.
    Keywords Holocene epoch ; coasts ; isotope labeling ; microfossils ; paleoecology ; radiocarbon dating ; sea level ; sediments ; stable isotopes ; Brazil
    Language English
    Dates of publication 2019-0708
    Size p. 383-393.
    Publishing place American Association of Stratigraphic Palynologists
    Document type Article
    ZDB-ID 2179197-1
    ISSN 1558-9188 ; 0191-6122
    ISSN (online) 1558-9188
    ISSN 0191-6122
    DOI 10.1080/01916122.2018.1463573
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  4. Article: Bioavailability and ecological risks of trace metals in bottom sediments from Doce river continental shelf before and after the biggest environmental disaster in Brazil: The collapse of the Fundão dam

    Aguiar, Valquíria Maria de Carvalho / Neto, José Antônio Baptista / Quaresma, Valéria da Silva / Bastos, Alex Cardoso / Athayde, João Pedro Moreno de

    Journal of environmental management. 2020 Oct. 15, v. 272

    2020  

    Abstract: The present study deals with bioavailability of trace metals in the Doce river continental shelf, southeast of Brazil. The bottom sediments of the study area were firstly sampled a few weeks before the biggest environmental disaster of Brazil, the ... ...

    Abstract The present study deals with bioavailability of trace metals in the Doce river continental shelf, southeast of Brazil. The bottom sediments of the study area were firstly sampled a few weeks before the biggest environmental disaster of Brazil, the collapse of the Fundão dam in November of 2015. The disaster released around 40 Mm³ of iron ore tailings into Doce river basin and an estimate of 10 Mm³ reached the river delta, having the adjacent continental shelf as the final destination. One year and a half later, on April of 2017, the continental shelf was sampled again. A total of 48 stations were evaluated concerning concentrations of trace metals (Zn, Cu, Pb, Ni, Cr) and other ancillary variables before and after the accident. Trace metals were determined through fractionation in order to assess mobility and establish the ecological risk through RAC index. Before the accident, trace metals mobility was Pb > Ni > Cu > Zn > Cr, with Pb Cu, Ni and posing high ecological risk (RAC>30%) in many stations. Differences in concentrations of metal from pre to post accident were significant, and the increase of trace metals was observed. The mobility order after the accident changed to: Cu > Pb > Ni >
    Keywords accidents ; bioavailability ; continental shelf ; environmental management ; fractionation ; risk ; river deltas ; rivers ; watersheds ; Brazil
    Language English
    Dates of publication 2020-1015
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2020.111086
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  5. Article: Iron rich self-assembly micelles on the Doce River continental shelf

    Grilo, Caroline Fiório / Cavichini, Arthur Sant'Ana / Orlando, Marcos Tadeu D'Azeredo / Bastos, Alex Cardoso / Oliveira, Kyssyanne Samihra Santos / Garcez, Lívia Rodrigues / Bandeira, Mayara / Júnior, Adeildo Costa / Ruschi, Anita / Fadini, Karen / Garonce, Flávia / Neves, Rafael Carvalho / D'Agostini, Danielle Peron / Sá, Fabian / Quaresma, Valéria da Silva

    Science of the total environment. 2022 Feb. 10, v. 807

    2022  

    Abstract: After the Fundão iron ore mining dam rupture in November 2015, yellow/ocher emulsions never before reported on the continental shelf adjacent to the Doce River began to be seen, both in coalesced and foam forms. XRD analyses pointed to a prevailing ... ...

    Abstract After the Fundão iron ore mining dam rupture in November 2015, yellow/ocher emulsions never before reported on the continental shelf adjacent to the Doce River began to be seen, both in coalesced and foam forms. XRD analyses pointed to a prevailing composition of iron and kaolinite with a substantial contribution of an organic-metallic compound, measured in multiple periods over 2 years of sampling. Optical microscopy images allowed the identification of micelles composed of nanoparticles of iron oxyhydroxide making up this emulsion. The generation of dendritic snowflake-shaped microcrystals on fiber filters after water sample filtration and heating confirmed the presence of micelles composed of iron oxyhydroxide nanoparticles enveloped by organic polymers. After losing water, the micelles may act as a self-assembly template seed, where the polymer acts in the oriented adsorption of nanoparticles according to their crystallographic structure. The study brought to light the distinct behavior of a portion of the tailings material, which has already been reported to not have the same flocculation process as the clay minerals previously found in the suspended particulate material (SPM) before the dam rupture.
    Keywords adsorption ; clay ; continental shelf ; emulsions ; environment ; filtration ; flocculation ; foams ; heat ; iron ; iron oxyhydroxides ; kaolinite ; light microscopy ; micelles ; polymers ; rivers
    Language English
    Dates of publication 2022-0210
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2021.151343
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  6. Article ; Online: Iron rich self-assembly micelles on the Doce River continental shelf.

    Grilo, Caroline Fiório / Cavichini, Arthur Sant'Ana / Orlando, Marcos Tadeu D'Azeredo / Bastos, Alex Cardoso / Oliveira, Kyssyanne Samihra Santos / Garcez, Lívia Rodrigues / Bandeira, Mayara / Júnior, Adeildo Costa / Ruschi, Anita / Fadini, Karen / Garonce, Flávia / Neves, Rafael Carvalho / D'Agostini, Danielle Peron / Sá, Fabian / Quaresma, Valéria da Silva

    The Science of the total environment

    2021  Volume 807, Issue Pt 2, Page(s) 151343

    Abstract: After the Fundão iron ore mining dam rupture in November 2015, yellow/ocher emulsions never before reported on the continental shelf adjacent to the Doce River began to be seen, both in coalesced and foam forms. XRD analyses pointed to a prevailing ... ...

    Abstract After the Fundão iron ore mining dam rupture in November 2015, yellow/ocher emulsions never before reported on the continental shelf adjacent to the Doce River began to be seen, both in coalesced and foam forms. XRD analyses pointed to a prevailing composition of iron and kaolinite with a substantial contribution of an organic-metallic compound, measured in multiple periods over 2 years of sampling. Optical microscopy images allowed the identification of micelles composed of nanoparticles of iron oxyhydroxide making up this emulsion. The generation of dendritic snowflake-shaped microcrystals on fiber filters after water sample filtration and heating confirmed the presence of micelles composed of iron oxyhydroxide nanoparticles enveloped by organic polymers. After losing water, the micelles may act as a self-assembly template seed, where the polymer acts in the oriented adsorption of nanoparticles according to their crystallographic structure. The study brought to light the distinct behavior of a portion of the tailings material, which has already been reported to not have the same flocculation process as the clay minerals previously found in the suspended particulate material (SPM) before the dam rupture.
    MeSH term(s) Clay ; Filtration ; Iron ; Micelles ; Rivers
    Chemical Substances Micelles ; Iron (E1UOL152H7) ; Clay (T1FAD4SS2M)
    Language English
    Publishing date 2021-10-30
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2021.151343
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  7. Article ; Online: Tracing iron ore tailings in the marine environment: An investigation of the Fundão dam failure.

    D Azeredo Orlando, Marcos Tadeu / Galvão, Elson Silva / Sant Ana Cavichini, Arthur / Gabrig Turbay Rangel, Caio Vinícius / Pinheiro Orlando, Cintia Garrido / Grilo, Caroline Fiório / Soares, Jacyra / Santos Oliveira, Kyssyanne Samihra / Sá, Fabian / Junior, Adeildo Costa / Bastos, Alex Cardoso / da Silva Quaresma, Valeria

    Chemosphere

    2020  Volume 257, Page(s) 127184

    Abstract: This work aims to characterize, in mineral and chemical terms, the ore tailings related to the Mariana disaster (MG, Brazil), occurred on 5 November 2015, and assess its correlation with sediments found in the continental shelf adjacent to the Doce River ...

    Abstract This work aims to characterize, in mineral and chemical terms, the ore tailings related to the Mariana disaster (MG, Brazil), occurred on 5 November 2015, and assess its correlation with sediments found in the continental shelf adjacent to the Doce River mouth (ES, Brazil). This study uses samples of tailings and seabed sediments collected at the mouth of the Doce River from 2012 to 2019. Elemental compositions of all samples were determined by X-ray fluorescence measurements; however, Synchrotron Resonant X-Ray Diffraction proved to be a remarkable technique to characterize the crystallographic phases of iron present in sediments. Studies and analyzes of the sediment samples showed that the tailings have a notable feature of the iron-crystallographic phases, mainly observed in the period after the Fundão dam failure, as compared with sediments collected in the period before. This set of iron-containing mineral phases, here called the Iron Mineralogical Set (IMS), consists of the main phases of hematite and magnetite and the minority phases of goethite and greenalite and it is used as a marker of tailings. Mass ac magnetic susceptibility measures supported the concept of the IMS as a marker. It is suggested a relationship between the content of the IMS in the sediment samples as a function of the measures of mass magnetic susceptibility. The IMS had shown the influence of tailings on the sea bed sediment indicating that there is no possibility, at the current stage, of predicting how many years this material will still be at the seabed.
    MeSH term(s) Brazil ; Disasters ; Environmental Monitoring ; Iron ; Iron Compounds ; Minerals ; Rivers/chemistry ; Water Pollutants, Chemical/analysis
    Chemical Substances Iron Compounds ; Minerals ; Water Pollutants, Chemical ; goethite (1310-14-1) ; Iron (E1UOL152H7)
    Language English
    Publishing date 2020-05-26
    Publishing country England
    Document type Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.127184
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  8. Article: Tracing iron ore tailings in the marine environment: An investigation of the Fundão dam failure

    D′Azeredo Orlando, Marcos Tadeu / Galvão, Elson Silva / Sant′Ana Cavichini, Arthur / Gabrig Turbay Rangel, Caio Vinícius / Pinheiro Orlando, Cintia Garrido / Grilo, Caroline Fiório / Soares, Jacyra / Santos Oliveira, Kyssyanne Samihra / Sá, Fabian / Junior, Adeildo Costa / Bastos, Alex Cardoso / da Silva Quaresma, Valeria

    Chemosphere. 2020 Oct., v. 257

    2020  

    Abstract: This work aims to characterize, in mineral and chemical terms, the ore tailings related to the Mariana disaster (MG, Brazil), occurred on 5 November 2015, and assess its correlation with sediments found in the continental shelf adjacent to the Doce River ...

    Abstract This work aims to characterize, in mineral and chemical terms, the ore tailings related to the Mariana disaster (MG, Brazil), occurred on 5 November 2015, and assess its correlation with sediments found in the continental shelf adjacent to the Doce River mouth (ES, Brazil). This study uses samples of tailings and seabed sediments collected at the mouth of the Doce River from 2012 to 2019. Elemental compositions of all samples were determined by X-ray fluorescence measurements; however, Synchrotron Resonant X-Ray Diffraction proved to be a remarkable technique to characterize the crystallographic phases of iron present in sediments. Studies and analyzes of the sediment samples showed that the tailings have a notable feature of the iron-crystallographic phases, mainly observed in the period after the Fundão dam failure, as compared with sediments collected in the period before. This set of iron-containing mineral phases, here called the Iron Mineralogical Set (IMS), consists of the main phases of hematite and magnetite and the minority phases of goethite and greenalite and it is used as a marker of tailings. Mass ac magnetic susceptibility measures supported the concept of the IMS as a marker. It is suggested a relationship between the content of the IMS in the sediment samples as a function of the measures of mass magnetic susceptibility. The IMS had shown the influence of tailings on the sea bed sediment indicating that there is no possibility, at the current stage, of predicting how many years this material will still be at the seabed.
    Keywords X-radiation ; X-ray diffraction ; continental shelf ; correlation ; crystallization ; elemental composition ; fluorescence ; goethite ; hematite ; iron ; magnetism ; magnetite ; marine environment ; mass ; mine tailings ; mouth ; prediction ; rivers ; sampling ; sediments ; Brazil
    Language English
    Dates of publication 2020-10
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-light
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.127184
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  9. Article ; Online: Traditional Ecological Knowledge and the mapping of benthic marine habitats.

    Teixeira, João Batista / Martins, Agnaldo Silva / Pinheiro, Hudson Tercio / Secchin, Nelio Augusto / Leão de Moura, Rodrigo / Bastos, Alex Cardoso

    Journal of environmental management

    2013  Volume 115, Page(s) 241–250

    Abstract: Traditional Ecological Knowledge (TEK) is the empirically accumulated knowledge of local communities whose livelihoods depend directly on natural resources. TEK has a considerable potential as a reliable, rapid and low cost information source. However, ... ...

    Abstract Traditional Ecological Knowledge (TEK) is the empirically accumulated knowledge of local communities whose livelihoods depend directly on natural resources. TEK has a considerable potential as a reliable, rapid and low cost information source. However, its use for decision making in environmental management is frequently challenged due to the lack of scientific validation and the multiple and poorly understood biases deriving from measurement and analytical errors, as well as from political, cultural and religious sources. During the planning stage of a Marine Protected Area (MPA) in Southeastern Brazil we assessed fisherfolk TEK regarding seabed features, comparing it with results from a conventional oceanographic assessment. TEK was acquired and synthesized during a survey involving 19 fishing villages and a consensus analysis that minimized variation among individual fisherfolks and communities. The oceanographic survey included high resolution benthic habitat mapping tools such as sidescan sonar and ground-truthing with SCUBA near the interfaces of benthic features identified by fisherfolk. Nearly 3000 km(2) of seafloor were mapped by local fisherfolk as "gravel", "sand", "mud" and "reef structures", while side-scan sonar surveys covered approximately 360 km with an average 400 m swath. Analyses of overlap and proximity showed that TEK is relatively cost-effective and accurate for large-scale benthic surveys, especially as a starting point for planning oceanographic surveys. Moreover, including TEK in the planning stage of MPAs may increase communities' participation and understanding of the costs and benefits of the new access and fishing effort regulations.
    MeSH term(s) Animals ; Ecology ; Ecosystem ; Fisheries ; Invertebrates
    Language English
    Publishing date 2013-01-30
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2012.11.020
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  10. Article: Traditional Ecological Knowledge and the mapping of benthic marine habitats

    Teixeira, João Batista / Martins, Agnaldo Silva / Pinheiro, Hudson Tercio / Secchin, Nelio Augusto / Leão de Moura, Rodrigo / Bastos, Alex Cardoso

    Journal of environmental management. 2013 Jan. 30, v. 115

    2013  

    Abstract: Traditional Ecological Knowledge (TEK) is the empirically accumulated knowledge of local communities whose livelihoods depend directly on natural resources. TEK has a considerable potential as a reliable, rapid and low cost information source. However, ... ...

    Abstract Traditional Ecological Knowledge (TEK) is the empirically accumulated knowledge of local communities whose livelihoods depend directly on natural resources. TEK has a considerable potential as a reliable, rapid and low cost information source. However, its use for decision making in environmental management is frequently challenged due to the lack of scientific validation and the multiple and poorly understood biases deriving from measurement and analytical errors, as well as from political, cultural and religious sources. During the planning stage of a Marine Protected Area (MPA) in Southeastern Brazil we assessed fisherfolk TEK regarding seabed features, comparing it with results from a conventional oceanographic assessment. TEK was acquired and synthesized during a survey involving 19 fishing villages and a consensus analysis that minimized variation among individual fisherfolks and communities. The oceanographic survey included high resolution benthic habitat mapping tools such as sidescan sonar and ground-truthing with SCUBA near the interfaces of benthic features identified by fisherfolk. Nearly 3000 km² of seafloor were mapped by local fisherfolk as “gravel”, “sand”, “mud” and “reef structures”, while side-scan sonar surveys covered approximately 360 km with an average 400 m swath. Analyses of overlap and proximity showed that TEK is relatively cost-effective and accurate for large-scale benthic surveys, especially as a starting point for planning oceanographic surveys. Moreover, including TEK in the planning stage of MPAs may increase communities' participation and understanding of the costs and benefits of the new access and fishing effort regulations.
    Keywords cost effectiveness ; decision making ; environmental management ; gravel ; habitats ; information sources ; livelihood ; natural resources ; planning ; politics ; sand ; surveys ; villages ; Brazil
    Language English
    Dates of publication 2013-0130
    Size p. 241-250.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2012.11.020
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