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Pesquisa : G16.500.275.157 [Categoria DeCS]
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  1 / 63706 MEDLINE  
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[PMID]:29414999
[Au] Autor:Carranza S; Xipell M; Tarroso P; Gardner A; Arnold EN; Robinson MD; Simó-Riudalbas M; Vasconcelos R; de Pous P; Amat F; Smíd J; Sindaco R; Metallinou M; Els J; Pleguezuelos JM; Machado L; Donaire D; Martínez G; Garcia-Porta J; Mazuch T; Wilms T; Gebhart J; Aznar J; Gallego J; Zwanzig BM; Fernández-Guiberteau D; Papenfuss T; Al Saadi S; Alghafri A; Khalifa S; Al Farqani H; Bait Bilal S; Alazri IS; Al Adhoobi AS; Al Omairi ZS; Al Shariani M; Al Kiyumi A; Al Sariri T; Al Shukaili AS; Al Akhzami SN
[Ad] Endereço:Institute of Evolutionary Biology (CSIC-Universitat Pompeu Fabra), Passeig Marítim de la Barceloneta, Barcelona, Spain.
[Ti] Título:Diversity, distribution and conservation of the terrestrial reptiles of Oman (Sauropsida, Squamata).
[So] Source:PLoS One;13(2):e0190389, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In the present work, we use an exceptional database including 5,359 records of 101 species of Oman's terrestrial reptiles together with spatial tools to infer the spatial patterns of species richness and endemicity, to infer the habitat preference of each species and to better define conservation priorities, with especial focus on the effectiveness of the protected areas in preserving this unique arid fauna. Our results indicate that the sampling effort is not only remarkable from a taxonomic point of view, with multiple observations for most species, but also for the spatial coverage achieved. The observations are distributed almost continuously across the two-dimensional climatic space of Oman defined by the mean annual temperature and the total annual precipitation and across the Principal Component Analysis (PCA) of the multivariate climatic space and are well represented within 17 out of the 20 climatic clusters grouping 10% of the explained climatic variance defined by PC1 and PC2. Species richness is highest in the Hajar and Dhofar Mountains, two of the most biodiverse areas of the Arabian Peninsula, and endemic species richness is greatest in the Jebel Akhdar, the highest part of the Hajar Mountains. Oman's 22 protected areas cover only 3.91% of the country, including within their limits 63.37% of terrestrial reptiles and 50% of all endemics. Our analyses show that large areas of the climatic space of Oman lie outside protected areas and that seven of the 20 climatic clusters are not protected at all. The results of the gap analysis indicate that most of the species are below the conservation target of 17% or even the less restrictive 12% of their total area within a protected area in order to be considered adequately protected. Therefore, an evaluation of the coverage of the current network of protected areas and the identification of priority protected areas for reptiles using reserve design algorithms are urgently needed. Our study also shows that more than half of the species are still pending of a definitive evaluation by the International Union for Conservation of Nature (IUCN).
[Mh] Termos MeSH primário: Biodiversidade
Conservação dos Recursos Naturais/métodos
Répteis/classificação
[Mh] Termos MeSH secundário: Animais
Clima
Ecossistema
Omã
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180208
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0190389


  2 / 63706 MEDLINE  
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[PMID]:29389966
[Au] Autor:Reyes-Velasco J; Manthey JD; Bourgeois Y; Freilich X; Boissinot S
[Ad] Endereço:New York University Abu Dhabi, Saadiyat Island, Abu Dhabi, United Arab Emirates.
[Ti] Título:Revisiting the phylogeography, demography and taxonomy of the frog genus Ptychadena in the Ethiopian highlands with the use of genome-wide SNP data.
[So] Source:PLoS One;13(2):e0190440, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Understanding the diversification of biological lineages is central to evolutionary studies. To properly study the process of speciation, it is necessary to link micro-evolutionary studies with macro-evolutionary mechanisms. Micro-evolutionary studies require proper sampling across a taxon's range to adequately infer genetic diversity. Here we use the grass frogs of the genus Ptychadena from the Ethiopian highlands as a model to study the process of lineage diversification in this unique biodiversity hotspot. We used thousands of genome-wide SNPs obtained from double digest restriction site associated DNA sequencing (ddRAD-seq) in populations of the Ptychadena neumanni species complex from the Ethiopian highlands in order to infer their phylogenetic relationships and genetic structure, as well as to study their demographic history. Our genome-wide phylogenetic study supports the existence of approximately 13 lineages clustered into 3 species groups. Our phylogenetic and phylogeographic reconstructions suggest that those endemic lineages diversified in allopatry, and subsequently specialized to different habitats and elevations. Demographic analyses point to a continuous decrease in the population size across the majority of lineages and populations during the Pleistocene, which is consistent with a continuous period of aridification that East Africa experienced since the Pliocene. We discuss the taxonomic implications of our analyses and, in particular, we warn against the recent practice to solely use Bayesian species delimitation methods when proposing taxonomic changes.
[Mh] Termos MeSH primário: Anuros/classificação
Genoma
Filogeografia
Polimorfismo de Nucleotídeo Único
[Mh] Termos MeSH secundário: Animais
Anuros/genética
Código de Barras de DNA Taxonômico
DNA Mitocondrial/genética
Ecossistema
Etiópia
Evolução Molecular
Reação em Cadeia da Polimerase
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (DNA, Mitochondrial)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180202
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0190440


  3 / 63706 MEDLINE  
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[PMID]:29381753
[Au] Autor:Sprague TA; Bateman HL
[Ad] Endereço:College of Integrative Sciences and Arts, Arizona State University, Mesa, Arizona, United States of America.
[Ti] Título:Influence of seasonality and gestation on habitat selection by northern Mexican gartersnakes (Thamnophis eques megalops).
[So] Source:PLoS One;13(1):e0191829, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Species conservation requires a thorough understanding of habitat requirements. The northern Mexican gartersnake (Thamnophis eques megalops) was listed as threatened under the U.S. Endangered Species Act in 2014. Natural resource managers are interested in understanding the ecology of this subspecies to guide management decisions and to determine what features are necessary for habitat creation and restoration. Our objective was to identify habitat selection of northern Mexican gartersnakes in a highly managed, constructed wetland hatchery. We deployed transmitters on 42 individual gartersnakes and documented use of habitat types and selection of specific habitat features. Habitat selection was similar between males and females and varied seasonally. During the active season (March-October), gartersnakes primarily selected wetland edge habitat with abundant cover. Gestating females selected similar locations but with less dense cover. During the inactive season (November-February), gartersnakes selected upland habitats, including rocky slopes with abundant vegetation. These results of this study can help inform management of the subspecies, particularly in human-influenced habitats. Conservation of this subspecies should incorporate a landscape-level approach that includes abundant wetland edge habitat with a mosaic of dense cover for protection and sparsely vegetated areas for basking connected to terrestrial uplands for overwintering.
[Mh] Termos MeSH primário: Comportamento Animal
Colubridae/fisiologia
Ecossistema
Estações do Ano
[Mh] Termos MeSH secundário: Animais
Feminino
Masculino
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180131
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191829


  4 / 63706 MEDLINE  
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[PMID]:29377918
[Au] Autor:Steenkamp PJ; van Heerden H; van Schalkwyk OL
[Ad] Endereço:University of Pretoria, Faculty of Veterinary Science, Department of Production Animal Studies, Onderstepoort, South Africa.
[Ti] Título:Ecological suitability modeling for anthrax in the Kruger National Park, South Africa.
[So] Source:PLoS One;13(1):e0191704, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The spores of the soil-borne bacterium, Bacillus anthracis, which causes anthrax are highly resistant to adverse environmental conditions. Under ideal conditions, anthrax spores can survive for many years in the soil. Anthrax is known to be endemic in the northern part of Kruger National Park (KNP) in South Africa (SA), with occasional epidemics spreading southward. The aim of this study was to identify and map areas that are ecologically suitable for the harboring of B. anthracis spores within the KNP. Anthrax surveillance data and selected environmental variables were used as inputs to the maximum entropy (Maxent) species distribution modeling method. Anthrax positive carcasses from 1988-2011 in KNP (n = 597) and a total of 40 environmental variables were used to predict and evaluate their relative contribution to suitability for anthrax occurrence in KNP. The environmental variables that contributed the most to the occurrence of anthrax were soil type, normalized difference vegetation index (NDVI) and precipitation. Apart from the endemic Pafuri region, several other areas within KNP were classified as ecologically suitable. The outputs of this study could guide future surveillance efforts to focus on predicted suitable areas for anthrax, since the KNP currently uses passive surveillance to detect anthrax outbreaks.
[Mh] Termos MeSH primário: Antraz/diagnóstico
Bacillus anthracis/isolamento & purificação
Ecossistema
[Mh] Termos MeSH secundário: Antraz/epidemiologia
Surtos de Doenças
Seres Humanos
África do Sul/epidemiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180130
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191704


  5 / 63706 MEDLINE  
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[PMID]:29258487
[Au] Autor:Ferrari C; Salle R; Callemeyn-Torre N; Jovelin R; Cutter AD; Braendle C
[Ad] Endereço:CNRS, IBV, Inserm, Université Côte d'Azur, Nice, France.
[Ti] Título:Ephemeral-habitat colonization and neotropical species richness of Caenorhabditis nematodes.
[So] Source:BMC Ecol;17(1):43, 2017 Dec 19.
[Is] ISSN:1472-6785
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The drivers of species co-existence in local communities are especially enigmatic for assemblages of morphologically cryptic species. Here we characterize the colonization dynamics and abundance of nine species of Caenorhabditis nematodes in neotropical French Guiana, the most speciose known assemblage of this genus, with resource use overlap and notoriously similar external morphology despite deep genomic divergence. METHODS: To characterize the dynamics and specificity of colonization and exploitation of ephemeral resource patches, we conducted manipulative field experiments and the largest sampling effort to date for Caenorhabditis outside of Europe. This effort provides the first in-depth quantitative analysis of substrate specificity for Caenorhabditis in natural, unperturbed habitats. RESULTS: We amassed a total of 626 strain isolates from nine species of Caenorhabditis among 2865 substrate samples. With the two new species described here (C. astrocarya and C. dolens), we estimate that our sampling procedures will discover few additional species of these microbivorous animals in this tropical rainforest system. We demonstrate experimentally that the two most prevalent species (C. nouraguensis and C. tropicalis) rapidly colonize fresh resource patches, whereas at least one rarer species shows specialist micro-habitat fidelity. CONCLUSION: Despite the potential to colonize rapidly, these ephemeral patchy resources of rotting fruits and flowers are likely to often remain uncolonized by Caenorhabditis prior to their complete decay, implying dispersal-limited resource exploitation. We hypothesize that a combination of rapid colonization, high ephemerality of resource patches, and species heterogeneity in degree of specialization on micro-habitats and life histories enables a dynamic co-existence of so many morphologically cryptic species of Caenorhabditis.
[Mh] Termos MeSH primário: Distribuição Animal
Caenorhabditis/fisiologia
Ecossistema
[Mh] Termos MeSH secundário: Animais
Biota
Guiana Francesa
Densidade Demográfica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171221
[St] Status:MEDLINE
[do] DOI:10.1186/s12898-017-0150-z


  6 / 63706 MEDLINE  
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[PMID]:29228938
[Au] Autor:Nishijima S; Nishikawa C; Miyashita T
[Ad] Endereço:Laboratory of Biodiversity Science, School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, 113-8657, Japan. nishijimash@gmail.com.
[Ti] Título:Habitat modification by invasive crayfish can facilitate its growth through enhanced food accessibility.
[So] Source:BMC Ecol;17(1):37, 2017 Dec 12.
[Is] ISSN:1472-6785
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Invasive ecosystem engineers can facilitate their invasions by modifying the physical environment to improve their own performance, but this positive feedback process has rarely been tested empirically except in sessile organisms. The invasive crayfish Procambarus clarkii is an ecosystem engineer that destroys aquatic macrophytes, which provide a physical refuge for animal prey, and this destruction is likely to enhance vulnerability to predators. Using two series of mesocosm experiments, we tested the hypothesis that the invasive crayfish increases its feeding efficiency on animal prey by reducing submerged macrophytes, thus increasing its individual growth rate in a positive density-dependent manner. RESULTS: In the first experiment, increasing crayfish density reduced both macrophytes and animal prey (dragonfly and chironomid larvae) and, importantly, increased the growth rate of individual crayfish, in accordance with our expectation. In the second experiment, we used artificial macrophytes to clarify whether the physical architecture of macrophytes itself protects animal prey and limits crayfish growth rate. Increasing the artificial macrophyte quantity not only increased the survival of animal prey, but also retarded the crayfish growth rate. CONCLUSIONS: We conclude that macrophytes strengthen bottom-up control of crayfish, but this effect can be relaxed by increasing the density of crayfish via reduction in macrophytes. This positive feedback process may explain the crayfish outbreaks and regime shifts occasionally observed in invaded freshwater ecosystems.
[Mh] Termos MeSH primário: Astacoidea/fisiologia
Ecossistema
Cadeia Alimentar
Espécies Introduzidas
[Mh] Termos MeSH secundário: Animais
Astacoidea/crescimento & desenvolvimento
Chironomidae/crescimento & desenvolvimento
Comportamento Alimentar
Água Doce
Larva/crescimento & desenvolvimento
Odonatos/crescimento & desenvolvimento
Desenvolvimento Vegetal
Densidade Demográfica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171213
[St] Status:MEDLINE
[do] DOI:10.1186/s12898-017-0147-7


  7 / 63706 MEDLINE  
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[PMID]:29187208
[Au] Autor:Segatto ALA; Reck-Kortmann M; Turchetto C; Freitas LB
[Ad] Endereço:Laboratory of Molecular Evolution, Department of Genetics, Universidade Federal do Rio Grande do Sul, P.O. Box 15053, Porto Alegre, RS, 91501-970, Brazil.
[Ti] Título:Multiple markers, niche modelling, and bioregions analyses to evaluate the genetic diversity of a plant species complex.
[So] Source:BMC Evol Biol;17(1):234, 2017 Nov 29.
[Is] ISSN:1471-2148
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The classification of closely related plants is not straightforward. These morphologically similar taxa frequently maintain their inter-hybridization potential and share ancestral polymorphisms as a consequence of their recent divergence. Under the biological species concept, they may thus not be considered separate species. The Petunia integrifolia complex is especially interesting because, in addition to the features mentioned above, its taxa share a pollinator, and their geographical ranges show multiple overlaps. Here, we combined plastid genome sequences, nuclear microsatellites, AFLP markers, ecological niche modelling, and bioregions analysis to investigate the genetic variability between the different taxa of the P. integrifolia complex in a comprehensive sample covering the entire geographical range of the complex. RESULTS: Results from molecular markers did not fully align with the current taxonomic classification. Niche modelling and bioregions analyses revealed that taxa were associated with different ecological constraints, indicating that the habitat plays an important role in preserving species boundaries. For three taxa, our analyses showed a mostly conserved, non-overlapping geographical distribution over time. However, for two taxa, niche modelling found an overlapping distribution over time; these taxa were also associated with the same bioregions. CONCLUSIONS: cpDNA markers were better able to discriminate between Petunia taxa than SSRs and AFLPs. Overall, our results suggest that the P. integrifolia complex represents a continuum of individuals from distant and historically isolated populations, which share some morphological traits, but are established in four different evolutionary lineages.
[Mh] Termos MeSH primário: Ecossistema
Variação Genética
Geografia
Petunia/genética
[Mh] Termos MeSH secundário: Análise do Polimorfismo de Comprimento de Fragmentos Amplificados
DNA de Cloroplastos/genética
Marcadores Genéticos
Haplótipos/genética
Repetições de Microssatélites/genética
Filogenia
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Chloroplast); 0 (Genetic Markers)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171201
[St] Status:MEDLINE
[do] DOI:10.1186/s12862-017-1084-y


  8 / 63706 MEDLINE  
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[PMID]:28464290
[Au] Autor:Connell SD; Fernandes M; Burnell OW; Doubleday ZA; Griffin KJ; Irving AD; Leung JYS; Owen S; Russell BD; Falkenberg LJ
[Ad] Endereço:Southern Seas Ecology Laboratories, School of Biological Sciences and The Environment Institute, North Terrace, The University of Adelaide, South Australia, Australia.
[Ti] Título:Testing for thresholds of ecosystem collapse in seagrass meadows.
[So] Source:Conserv Biol;31(5):1196-1201, 2017 10.
[Is] ISSN:1523-1739
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Although the public desire for healthy environments is clear-cut, the science and management of ecosystem health has not been as simple. Ecological systems can be dynamic and can shift abruptly from one ecosystem state to another. Such unpredictable shifts result when ecological thresholds are crossed; that is, small cumulative increases in an environmental stressor drive a much greater change than could be predicted from linear effects, suggesting an unforeseen tipping point is crossed. In coastal waters, broad-scale seagrass loss often occurs as a sudden event associated with human-driven nutrient enrichment (eutrophication). We tested whether the response of seagrass ecosystems to coastal nutrient enrichment is subject to a threshold effect. We exposed seagrass plots to different levels of nutrient enrichment (dissolved inorganic nitrogen) for 10 months and measured net production. Seagrass response exhibited a threshold pattern when nutrient enrichment exceeded moderate levels: there was an abrupt and large shift from positive to negative net leaf production (from approximately 0.04 leaf production to 0.02 leaf loss per day). Epiphyte load also increased as nutrient enrichment increased, which may have driven the shift in leaf production. Inadvertently crossing such thresholds, as can occur through ineffective management of land-derived inputs such as wastewater and stormwater runoff along urbanized coasts, may account for the widely observed sudden loss of seagrass meadows. Identification of tipping points may improve not only adaptive-management monitoring that seeks to avoid threshold effects, but also restoration approaches in systems that have crossed them.
[Mh] Termos MeSH primário: Ecossistema
Eutrofização
[Mh] Termos MeSH secundário: Conservação dos Recursos Naturais
Oceanos e Mares
Poaceae
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180310
[Lr] Data última revisão:
180310
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170503
[St] Status:MEDLINE
[do] DOI:10.1111/cobi.12951


  9 / 63706 MEDLINE  
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[PMID]:29029380
[Au] Autor:Santos ACC; Choueri RB; de Figueiredo Eufrasio Pauly G; Abessa D; Gallucci F
[Ad] Endereço:Centro de Estudos do Mar da Universidade Federal do Paraná, Av. Beira-mar, s/n 83255-976, Pontal do Sul, PR, Brazil; Centro de Biologia Marinha da Universidade de São Paulo, Rodovia Manoel Hypólito do Rego, km 131.5, São Sebastião, SP 11600-000, Brazil.
[Ti] Título:Is the microcosm approach using meiofauna community descriptors a suitable tool for ecotoxicological studies?
[So] Source:Ecotoxicol Environ Saf;147:945-953, 2018 Jan.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The usual approaches used in ecological risk assessment have been based on individual and population level standard procedures. Although these have been important tools to assess adverse effects on ecosystems, they are generally simplified and therefore lack ecological realism. Microcosm studies using meiobenthic communities offer a good compromise between the complexity of the ecosystem and the often highly artificial settings of laboratory experiments. An experiment was designed to investigate the potential of the microcosm approach using meiofauna as a tool for ecotoxicological studies. The experiment tested the ecological effects of exposure to sewage-impacted pore water simultaneously at the community level using meiofauna microcosms and at the individual level using laboratory fecundity tests with the copepod Nitokra sp. Specifically, the experiment tested the toxicity of pore water from three sites according to a contamination gradient. Both approaches were efficient in detecting differences in toxicity between the less and more contaminated sites. However, only multivariate data from community analysis detected differences in the gradient of contamination. In addition to information about toxicity, the community level microcosm experiment gave indications about sensitive and tolerant species, indirect ecological effects, as well as raised hypothesis about contamination routes and bioavailability to be tested. Considering the importance of meiofauna for benthic ecosystems, the microcosm approach using natural meiobenthic communities might be a valuable addition as a higher tier approach in ecological risk assessment, providing highly relevant ecological information on the toxicity of contaminated sediments.
[Mh] Termos MeSH primário: Copépodes/efeitos dos fármacos
Ecotoxicologia/métodos
Monitoramento Ambiental/métodos
Sedimentos Geológicos/microbiologia
Poluentes Químicos da Água/toxicidade
[Mh] Termos MeSH secundário: Animais
Brasil
Ecologia
Ecossistema
Sedimentos Geológicos/análise
Medição de Risco
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171015
[St] Status:MEDLINE


  10 / 63706 MEDLINE  
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[PMID]:28987403
[Au] Autor:Abraham J; Dowling K; Florentine S
[Ad] Endereço:School of Applied and Biomedical Sciences, Faculty of Science and Technology, Federation University Australia, Mount Helen Campus, VIC 3350, Australia. Electronic address: j.abraham@federation.edu.au.
[Ti] Título:Effects of prescribed fire and post-fire rainfall on mercury mobilization and subsequent contamination assessment in a legacy mine site in Victoria, Australia.
[So] Source:Chemosphere;190:144-153, 2018 Jan.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Prescribed fire conducted in fire-prone areas is a cost-effective choice for forest management, but it also affects many of the physicochemical and bio-geological properties of the forest soil, in a similar manner to wild fires. The aim of this study is to investigate the nature of the mercury mobilization after a prescribed fire and the subsequent temporal changes in concentration. A prescribed fire was conducted in a legacy mine site in Central Victoria, Australia, in late August 2015 and soil sample collection and analyses were carried out two days before and two days after the fire, followed by collection at the end of each season and after an intense rainfall event in September 2016. Results revealed the occurrence of mercury volatilization (8.3-97%) during the fire, and the mercury concentration displayed a significant difference (p < 0.05) before and immediately after the fire. Integrated assessment with number of pollution indices has shown that the study site is extremely contaminated with mercury during all the sampling events, and this poses a serious ecological risk due to the health impacts of mercury on human and ecosystems. In times of climate fluctuation with concomitant increase in forest fire (including prescribed fire), and subsequent precipitation and runoff, the potential for an increased amount of mercury being mobilized is of heighted significance. Therefore, it is recommended that prescribed fire should be cautiously considered as a forest management strategy in any mercury affected landscapes.
[Mh] Termos MeSH primário: Fogo
Mercúrio/análise
Mineração
Chuvas
Poluentes do Solo/análise
[Mh] Termos MeSH secundário: Ecossistema
Poluição Ambiental/análise
Poluição Ambiental/prevenção & controle
Seres Humanos
Solo/química
Vitória
Volatilização
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil); 0 (Soil Pollutants); FXS1BY2PGL (Mercury)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171009
[St] Status:MEDLINE



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BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde