Base de dados : MEDLINE
Pesquisa : Z01.107.567.875.350 [Categoria DeCS]
Referências encontradas : 784 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 79 ir para página                         

  1 / 784 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28749652
[Au] Autor:Bertrand K; Hare L
[Ad] Endereço:Institut national de la recherche scientifique, Eau Terre Environnement (INRS-ETE), Université du Québec , 490 de la Couronne, Quebec City, Québec G1K 9A9, Canada.
[Ti] Título:Evaluating Benthic Recovery Decades after a Major Oil Spill in the Laurentian Great Lakes.
[So] Source:Environ Sci Technol;51(17):9561-9568, 2017 Sep 05.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The long-term effects of oil spills on freshwater organisms have been little studied. In 1950, a large oil spill (10 million L) covered the harbor area of Parry Sound, Ontario, the deepest port in the Laurentian Great Lakes. Ecological impacts were not studied at the time, but 25 years later three-quarters of the Chironomus cucini larvae (Insecta, Diptera, Chironomidae) living in the harbor area were reported to be deformed. We returned six decades after the spill and found that the frequency of deformities had returned to background levels and that the community of burrowing invertebrates has largely recovered. By dating sediment cores and measuring the depth distribution of oils, we conclude that, although the oil persists six decades after the spill, sufficient uncontaminated sediment has covered the oil thereby putting it out of reach of most burrowing animals. Provided that the sediment remains undisturbed, the buried oil is unlikely to exert further negative effects on the biota in spite of the fact that it will likely persist for centuries.
[Mh] Termos MeSH primário: Monitoramento Ambiental
Poluição por Petróleo
[Mh] Termos MeSH secundário: Animais
Sedimentos Geológicos
Great Lakes Region
Lagos
Ontário
Poluentes Químicos da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171218
[Lr] Data última revisão:
171218
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170728
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.7b02392


  2 / 784 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29020009
[Au] Autor:Meyer KA; Davis TW; Watson SB; Denef VJ; Berry MA; Dick GJ
[Ad] Endereço:Cooperative Institute for Great Lakes Research (CIGLR), University of Michigan, Ann Arbor, MI, United States of America.
[Ti] Título:Genome sequences of lower Great Lakes Microcystis sp. reveal strain-specific genes that are present and expressed in western Lake Erie blooms.
[So] Source:PLoS One;12(10):e0183859, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Blooms of the potentially toxic cyanobacterium Microcystis are increasing worldwide. In the Laurentian Great Lakes they pose major socioeconomic, ecological, and human health threats, particularly in western Lake Erie. However, the interpretation of "omics" data is constrained by the highly variable genome of Microcystis and the small number of reference genome sequences from strains isolated from the Great Lakes. To address this, we sequenced two Microcystis isolates from Lake Erie (Microcystis aeruginosa LE3 and M. wesenbergii LE013-01) and one from upstream Lake St. Clair (M. cf aeruginosa LSC13-02), and compared these data to the genomes of seventeen Microcystis spp. from across the globe as well as one metagenome and seven metatranscriptomes from a 2014 Lake Erie Microcystis bloom. For the publically available strains analyzed, the core genome is ~1900 genes, representing ~11% of total genes in the pan-genome and ~45% of each strain's genome. The flexible genome content was related to Microcystis subclades defined by phylogenetic analysis of both housekeeping genes and total core genes. To our knowledge this is the first evidence that the flexible genome is linked to the core genome of the Microcystis species complex. The majority of strain-specific genes were present and expressed in bloom communities in Lake Erie. Roughly 8% of these genes from the lower Great Lakes are involved in genome plasticity (rapid gain, loss, or rearrangement of genes) and resistance to foreign genetic elements (such as CRISPR-Cas systems). Intriguingly, strain-specific genes from Microcystis cultured from around the world were also present and expressed in the Lake Erie blooms, suggesting that the Microcystis pangenome is truly global. The presence and expression of flexible genes, including strain-specific genes, suggests that strain-level genomic diversity may be important in maintaining Microcystis abundance during bloom events.
[Mh] Termos MeSH primário: Eutrofização
Regulação Bacteriana da Expressão Gênica
Genes Bacterianos
Microcystis/genética
[Mh] Termos MeSH secundário: Sequência de Bases
Sistemas CRISPR-Cas/genética
Great Lakes Region
Metagenoma
Microcystis/isolamento & purificação
Filogenia
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171012
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0183859


  3 / 784 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28868735
[Au] Autor:Braham RP; Blazer VS; Shaw CH; Mazik PM
[Ad] Endereço:School of Natural Resources, West Virginia University, Morgantown, West Virgina, 26506.
[Ti] Título:Micronuclei and other erythrocyte nuclear abnormalities in fishes from the Great Lakes Basin, USA.
[So] Source:Environ Mol Mutagen;58(8):570-581, 2017 Oct.
[Is] ISSN:1098-2280
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Biological markers (biomarkers) sensitive to genotoxic and mutagenic contamination in fishes are widely used to identify exposure effects in aquatic environments. The micronucleus assay was incorporated into a suite of indicators to assess exposure to genotoxic and mutagenic contamination at five Great Lakes Areas of Concern (AOCs), as well as one non-AOC (reference) site. The assay allowed enumeration of micronuclei as well as other nuclear abnormalities for both site and species comparisons. Erythrocyte abnormality data was also compared to skin and liver tumor prevalence and hepatic transcript abundance. Erythrocyte abnormalities were observed at all sites with variable occurrence and severity among sites and species. Benthic-oriented brown bullhead (Ameiurus nebulosus) and white sucker (Catostomus commersonii) expressed lower rates of erythrocyte abnormalities, but higher rates of skin and liver neoplasms, when compared to pelagic-oriented largemouth bass (Micropterus salmoides) or smallmouth bass (Micropterus dolomieu) at the same site. The reduced erythrocyte abnormalities, increased transcript abundance associated with Phase I and II toxicant responsive pathways, and increased neoplastic lesions among benthic-oriented taxa may indicate the development of contaminant resistance of these species to more acute effects. Environ. Mol. Mutagen. 58:570-581, 2017. © 2017 This article is a U.S. Government work and is in the public domain in the USA. Environmental and Molecular Mutagenesis published by Wiley Periodicals, Inc. on behalf of Environmental Mutagen Society.
[Mh] Termos MeSH primário: Monitoramento Ambiental
Eritrócitos/efeitos dos fármacos
Fígado/efeitos dos fármacos
Poluentes Químicos da Água/toxicidade
[Mh] Termos MeSH secundário: Animais
Cipriniformes/anormalidades
Eritrócitos/patologia
Great Lakes Region
Lagos
Fígado/patologia
Reprodução/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171102
[Lr] Data última revisão:
171102
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170905
[St] Status:MEDLINE
[do] DOI:10.1002/em.22123


  4 / 784 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28823046
[Au] Autor:Martin PA; McDaniel TV; Hughes KD; Hunter B
[Ad] Endereço:Environment and Climate Change Canada, 867 Lakeshore Road, Burlington, Ontario, L7S 1A1, Canada. pamela.martin2@canada.ca.
[Ti] Título:Organochlorine contaminants in wild mink from the lower Great Lakes basin, Canada, 1998-2006.
[So] Source:Environ Monit Assess;189(9):459, 2017 Aug 19.
[Is] ISSN:1573-2959
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Organochlorine contaminants were measured in livers of wild mink (Neovison vison) trapped in the lower Great Lakes basin from 1998 to 2006. To assess exposure and potential risk in mink feeding on Great Lakes biota, concentrations of contaminants were compared in mink trapped within 7.8 km of the shoreline as well as at inland sites (i.e., 8-40 km). Overall, significant spatial variation in mean hepatic concentrations of sum PCBs and seven other organochlorines was found in mink from 13 Great Lakes sites, many of which are within the Great Lakes Areas of Concern. Mean sum PCB concentrations, on a lipid weight basis, ranged from 2 µg/g in mink from inland Lake Ontario sites to 44 µg/g in mink from western Lake Erie. Concentrations of other organochlorines in mink were generally low. Mink from western Lake Erie had the highest mean cumulative organochlorine burdens dominated largely by PCBs. A significant age effect was found with 1-year-old mink having significantly higher PCB burdens than mink less than 1 year in age. With respect to published PCB threshold effect concentrations, some mink exceeded those associated with effects on reproduction and survival as well as the presence of jaw lesions. This was most consistently found in western Lake Erie where the health of populations of wild mink may be adversely affected and where no mink 2 years of age or older were collected.
[Mh] Termos MeSH primário: Monitoramento Ambiental
Poluentes Ambientais/metabolismo
Hidrocarbonetos Clorados/metabolismo
Vison/metabolismo
[Mh] Termos MeSH secundário: Animais
Canadá
Great Lakes Region
Hidrocarbonetos Clorados/análise
Ontário
Bifenilos Policlorados/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Environmental Pollutants); 0 (Hydrocarbons, Chlorinated); DFC2HB4I0K (Polychlorinated Biphenyls)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171102
[Lr] Data última revisão:
171102
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170821
[St] Status:MEDLINE
[do] DOI:10.1007/s10661-017-6154-5


  5 / 784 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28749978
[Au] Autor:Limay-Rios V; Miller JD; Schaafsma AW
[Ad] Endereço:Department of Plant Agriculture, University of Guelph, Ridgetown, Ontario, Canada.
[Ti] Título:Occurrence of Penicillium verrucosum, ochratoxin A, ochratoxin B and citrinin in on-farm stored winter wheat from the Canadian Great Lakes Region.
[So] Source:PLoS One;12(7):e0181239, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The occurrence of P. verrucosum and ochratoxin A (OTA) were surveyed for 3 and 4 years, respectively. A total of 250 samples was collected from an average of 30 farms during the 2011, 2012, 2013 and 2014 winter seasons. Most storage bins surveyed were typically 11 m high round bins made of corrugated, galvanized steel, with flat-bottoms and conical roofs. Samples of clumped grain contained the most P. verrucosum (p<0.05, n = 10) followed by samples taken from the first load (n = 24, mean = 147±87 CFU/g) and last load (n = 17, mean = 101±77 CFU/g). Five grain samples (2.2%) tested positive for OTA, citrinin and OTB at concentrations of 14.7±7.9, 4.9±1.9 and 1.2±0.7 ng/g, with only three samples exceeding 5 ng/g. Grain samples positive for OTA were related to moisture resulting from either condensation or migrating moist warm air in the bin or areas where precipitation including snow entered the bin. Bins containing grain and clumps contaminated with OTA were studied in detail. A number of statistically-significant risk factors for OTA contamination were identified. These included 1) grain clumps accumulated around or directly under manhole openings, 2) debris and residue of old grain or grain clumps collected from the bin walls or left on storage floor and augers and 3) grain clumps accumulated around side doors. Even when grain enters storage below the 14.5% threshold of moisture, condensation and moisture migration occurs in hotspots in modern corrugated steel storage bins. Hot spots of OTA contamination were most often in areas affected by moisture migration due to inadequate aeration and exposure to moisture from precipitation or condensation. Further, we found that the nature of the condensation affects the nature and distribution of small and isolated areas with high incidence of toxin contamination and/or P. verrucosum prevalence in the grain bins examined.
[Mh] Termos MeSH primário: Citrinina/metabolismo
Ocratoxinas/metabolismo
Penicillium/metabolismo
Estações do Ano
Triticum/microbiologia
[Mh] Termos MeSH secundário: Análise de Variância
Canadá
Cromatografia Líquida de Alta Pressão
Geografia
Great Lakes Region
Espectrometria de Massas por Ionização por Electrospray
Espectrometria de Massas em Tandem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ochratoxins); 1779SX6LUY (ochratoxin A); 3S697X6SNZ (Citrinin); ECJ5WS94N2 (ochratoxin B)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170929
[Lr] Data última revisão:
170929
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170728
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0181239


  6 / 784 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28561092
[Au] Autor:McConville MB; Cohen NM; Nowicki SM; Lantz SR; Hixson JL; Ward AS; Remucal CK
[Ad] Endereço:Environmental Chemistry and Technology Program, University of Wisconsin - Madison, Madison, Wisconsin, USA. remucal@wisc.edu.
[Ti] Título:A field analysis of lampricide photodegradation in Great Lakes tributaries.
[So] Source:Environ Sci Process Impacts;19(7):891-900, 2017 Jul 19.
[Is] ISSN:2050-7895
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The lampricides 3-trifluoromethyl-4-nitrophenol (TFM) and 2',5-dichloro-4'-nitrosalicylanilide (niclosamide) are added to Great Lakes tributaries to target the sea lamprey, an invasive parasitic fish. This study examines the photochemical behavior of the lampricides in Carpenter Creek, Sullivan Creek, and the Manistique River. The observed loss of TFM in Carpenter and Sullivan Creeks (i.e., 34 and 19%) was similar to the loss of bromide in parallel time of passage studies (i.e., 30 and 29%), demonstrating that TFM photodegradation was minimal in both tributaries during the lampricide application. Furthermore, the absence of inorganic and organic photoproducts in the Manistique River demonstrates that TFM and niclosamide photodegradation was minimal in this large tributary, despite its long residence time (i.e., 3.3 days). Kinetic modeling was used to identify environmental variables primarily responsible for the limited photodegradation of TFM in the field compared to estimates from laboratory data. This analysis demonstrates that the lack of TFM photodegradation was attributable to the short residence times in Carpenter and Sullivan Creeks, while depth, time of year, time of day, and cloud cover influenced photochemical fate in the Manistique River. The modeling approach was extended to assess how many of the 140 United States tributaries treated with lampricides in 2015 and 2016 were amenable to TFM photolysis. While >50% removal of TFM due to photolysis could occur in 13 long and shallow tributaries, in most systems lampricides will reach the Great Lakes untransformed.
[Mh] Termos MeSH primário: Niclosamida/análise
Nitrofenóis/análise
Petromyzon/crescimento & desenvolvimento
Fotólise
Rios/química
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Animais
Monitoramento Ambiental
Great Lakes Region
Espécies Introduzidas
Cinética
Niclosamida/efeitos da radiação
Nitrofenóis/efeitos da radiação
Poluentes Químicos da Água/efeitos da radiação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Nitrophenols); 0 (Water Pollutants, Chemical); 8KK8CQ2K8G (Niclosamide); 96W52A3IFS (3-trifluoromethyl-4-nitrophenol)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171102
[Lr] Data última revisão:
171102
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170601
[St] Status:MEDLINE
[do] DOI:10.1039/c7em00173h


  7 / 784 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28225817
[Au] Autor:Rempel RS; Hornseth ML
[Ad] Endereço:Ontario Ministry of Natural Resources and Forestry, Centre for Northern Forest Ecosystem Research, Thunder Bay, Ontario, Canada.
[Ti] Título:Binational climate change vulnerability assessment of migratory birds in the Great Lakes Basins: Tools and impediments.
[So] Source:PLoS One;12(2):e0172668, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Climate change is a global concern, requiring international strategies to reduce emissions, however, climate change vulnerability assessments are often local in scope with assessment areas restricted to jurisdictional boundaries. In our study we explored tools and impediments to understanding and responding to the effects of climate change on vulnerability of migratory birds from a binational perspective. We apply and assess the utility of a Climate Change Vulnerability Index on 3 focal species using distribution or niche modeling frameworks. We use the distributional forecasts to explore possible changes to jurisdictional conservation responsibilities resulting from shifting distributions for: eastern meadowlark (Sturnella magna), wood thrush (Hylocichla mustelina), and hooded warbler (Setophaga citrina). We found the Climate Change Vulnerability Index to be a well-organized approach to integrating numerous lines of evidence concerning effects of climate change, and provided transparency to the final assessment of vulnerability. Under this framework, we identified that eastern meadowlark and wood thrush are highly vulnerable to climate change, but hooded warbler is less vulnerable. Our study revealed impediments to assessing and modeling vulnerability to climate change from a binational perspective, including gaps in data or modeling for climate exposure parameters. We recommend increased cross-border collaboration to enhance the availability and resources needed to improve vulnerability assessments and development of conservation strategies. We did not find evidence to suggest major shifts in jurisdictional responsibility for the 3 focal species, but results do indicate increasing responsibility for these birds in the Canadian Provinces. These Provinces should consider conservation planning to help ensure a future supply of necessary habitat for these species.
[Mh] Termos MeSH primário: Migração Animal
Biodiversidade
Mudança Climática
Conservação dos Recursos Naturais/métodos
Ecossistema
[Mh] Termos MeSH secundário: Animais
Aves
Canadá
Great Lakes Region
Lagos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170223
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0172668


  8 / 784 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28196149
[Au] Autor:Hileman ET; King RB; Adamski JM; Anton TG; Bailey RL; Baker SJ; Bieser ND; Bell TA; Bissell KM; Bradke DR; Campa H; Casper GS; Cedar K; Cross MD; DeGregorio BA; Dreslik MJ; Faust LJ; Harvey DS; Hay RW; Jellen BC; Johnson BD; Johnson G; Kiel BD; Kingsbury BA; Kowalski MJ; Lee YM; Lentini AM; Marshall JC; Mauger D; Moore JA; Paloski RA; Phillips CA; Pratt PD; Preney T; Prior KA; Promaine A; Redmer M; Reinert HK; Rouse JD; Shoemaker KT; Sutton S; VanDeWalle TJ; Weatherhead PJ; Wynn D; Yagi A
[Ad] Endereço:Department of Biological Sciences, Northern Illinois University, DeKalb, Illinois, United States of America.
[Ti] Título:Climatic and geographic predictors of life history variation in Eastern Massasauga (Sistrurus catenatus): A range-wide synthesis.
[So] Source:PLoS One;12(2):e0172011, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Elucidating how life history traits vary geographically is important to understanding variation in population dynamics. Because many aspects of ectotherm life history are climate-dependent, geographic variation in climate is expected to have a large impact on population dynamics through effects on annual survival, body size, growth rate, age at first reproduction, size-fecundity relationship, and reproductive frequency. The Eastern Massasauga (Sistrurus catenatus) is a small, imperiled North American rattlesnake with a distribution centered on the Great Lakes region, where lake effects strongly influence local conditions. To address Eastern Massasauga life history data gaps, we compiled data from 47 study sites representing 38 counties across the range. We used multimodel inference and general linear models with geographic coordinates and annual climate normals as explanatory variables to clarify patterns of variation in life history traits. We found strong evidence for geographic variation in six of nine life history variables. Adult female snout-vent length and neonate mass increased with increasing mean annual precipitation. Litter size decreased with increasing mean temperature, and the size-fecundity relationship and growth prior to first hibernation both increased with increasing latitude. The proportion of gravid females also increased with increasing latitude, but this relationship may be the result of geographically varying detection bias. Our results provide insights into ectotherm life history variation and fill critical data gaps, which will inform Eastern Massasauga conservation efforts by improving biological realism for models of population viability and climate change.
[Mh] Termos MeSH primário: Mudança Climática
Variação Genética
Modelos Biológicos
Viperidae/fisiologia
[Mh] Termos MeSH secundário: Animais
Feminino
Great Lakes Region
Masculino
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170809
[Lr] Data última revisão:
170809
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170215
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0172011


  9 / 784 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28092768
[Au] Autor:Blukacz-Richards EA; Visha A; Graham ML; McGoldrick DL; de Solla SR; Moore DJ; Arhonditsis GB
[Ad] Endereço:Environment and Climate Change Canada, 867 Lakeshore Road, Burlington, Ontario L7S 1A1, Canada; Department of Physical and Environmental Sciences, University of Toronto, Toronto, Ontario M1C 1A4, Canada. Electronic address: Agnes.Richards@canada.ca.
[Ti] Título:Mercury levels in herring gulls and fish: 42 years of spatio-temporal trends in the Great Lakes.
[So] Source:Chemosphere;172:476-487, 2017 Apr.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Total mercury levels in aquatic birds and fish communities have been monitored across the Canadian Great Lakes by Environment and Climate Change Canada (ECCC) for the past 42 years (1974-2015). These data (22 sites) were used to examine spatio-temporal variability of mercury levels in herring gull (Larus argentatus) eggs, lake trout (Salvelinus namaycush), walleye (Sander vitreus), and rainbow smelt (Osmerus mordax). Trends were quantified with dynamic linear models, which provided time-variant rates of change of mercury concentrations. Lipid content (in both fish and eggs) and length in fish were used as covariates in all models. For the first three decades, mercury levels in gull eggs and fish declined at all stations. In the 2000s, trends for herring gull eggs reversed at two sites in Lake Erie and two sites in Lake Ontario. Similar trend reversals in the 2000s were observed for lake trout in Lake Superior and at a single station in Lake Ontario. Mercury levels in lake trout continued to slowly decline at all of the remaining stations, except for Lake Huron, where the levels remained stable. A post-hoc Bayesian regression analysis suggests strong trophic interactions between herring gulls and rainbow smelt in Lake Superior and Lake Ontario, but also pinpoints the likelihood of a trophic decoupling in Lake Huron and Lake Erie. Continued monitoring of mercury levels in herring gulls and fish is required to consolidate these trophic shifts and further evaluate their broader implications.
[Mh] Termos MeSH primário: Charadriiformes
Ovos/análise
Monitoramento Ambiental/métodos
Mercúrio/análise
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Animais
Teorema de Bayes
Canadá
Mudança Climática
Cadeia Alimentar
Great Lakes Region
Lagos
Modelos Lineares
Lipídeos/química
Percas
Análise de Regressão
Análise Espaço-Temporal
Truta
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lipids); 0 (Water Pollutants, Chemical); FXS1BY2PGL (Mercury)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170117
[St] Status:MEDLINE


  10 / 784 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27997128
[Au] Autor:Guo J; Li Z; Ranasinghe P; Bonina S; Hosseini S; Corcoran MB; Smalley C; Rockne KJ; Sturchio NC; Giesy JP; Li A
[Ti] Título:Spatial and Temporal Trends of Polyhalogenated Carbazoles in Sediments of Upper Great Lakes: Insights into Their Origin.
[So] Source:Environ Sci Technol;51(1):89-97, 2017 Jan 03.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Polyhalogenated carbazoles (PHCZs) have been increasingly detected in the environment. Their similarities in chemical structure with legacy pollutants and their potential toxicity have caused increasing concern. In this work, 112 Ponar grab and 28 core sediment samples were collected from Lakes Michigan, Superior, and Huron, and a total of 26 PHCZs were analyzed along with unsubstituted carbazole using gas chromatography coupled with single- or triple-quadrupole mass spectrometry. Our results show that the total accumulation of PHCZs in the sediments of the upper Great Lakes is >3000 tonnes, orders of magnitude greater than those of polychlorinated biphenyls (PCBs) and decabromodiphenyl ether (BDE209). The 27 individual analytes differ in spatial distribution and temporal trend. Our results showed that PHCZs with substitution patterns of -Br , -Cl Br , or having iodine, were more abundant in sediment of Lake Michigan deposited before 1900 than those deposited more recently, implying a natural origin. Some "emerging" PHCZs have been increasingly deposited into the sediment in recent decades, and deserve further environmental monitoring and research. Other PHCZs with low halogen substitution may form from in situ dehalogenation of PHCZs having more halogens. Anthropogenic sources of PHCZs may exist, particularly for the emerging and low molecular mass congeners.
[Mh] Termos MeSH primário: Sedimentos Geológicos/química
Lagos/química
[Mh] Termos MeSH secundário: Carbazóis
Monitoramento Ambiental
Great Lakes Region
Bifenilos Policlorados
Poluentes Químicos da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Carbazoles); 0 (Water Pollutants, Chemical); DFC2HB4I0K (Polychlorinated Biphenyls)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170621
[Lr] Data última revisão:
170621
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161221
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.6b06128



página 1 de 79 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

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