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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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[PMID]:28264625
[Au] Autor:Zhao C; Wang CC; Li JQ; Wang P; Ou JQ; Cui JR
[Ad] Endereço:a Beijing Key Laboratory of Functional Materials for Building Structure and Environment , Remediation Beijing University of Civil Engineering and Architecture , Beijing , People's Republic of China.
[Ti] Título:Interactions between copper(II) and DOM in the urban stormwater runoff: modeling and characterizations.
[So] Source:Environ Technol;39(1):120-129, 2018 Jan.
[Is] ISSN:0959-3330
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Dissolved organic matter (DOM) can strongly interact with both organic and inorganic contaminants to influence their transportation, transformation, bioavailability, toxicity and even their ultimate fate. Within this work, DOM was extracted from urban stormwater runoff samples collected from a regular sampling site of a typical residential area in Beijing, China. Copper(II) ions were selected as model to investigate the interactions between DOM and typical heavy metals. Both ultraviolet (UV) absorbance and fluorescence titration methods were introduced to determine the complex capacities (C ) and conditional stability constants (log K ) of bonding between DOM and copper (II) ions, which revealed that the values of C were 85.62 and 87.23 µmol mg and the log K values were 5.37 and 5.48, respectively. The results suggested the successful complexation between DOM and copper(II) ions. Furthermore, morphology of the DOM binding to copper(II) ions was confirmed by both energy-dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS), which can facilitate to clarify the corresponding mechanism. The Cu 2p peak at 933.7 eV and the characteristic shake-up peaks of Cu-O were found in the XPS spectra, implying that copper(II) ions might coordinate with hydroxyl (aliphatic or phenolic) or carboxyl groups. With these profitable results, it can be concluded that DOM in urban stormwater runoff has a strong binding affinity with copper(II) ions, which may further lead to potentially significant influence on their migration and transformation.
[Mh] Termos MeSH primário: Cobre/química
Modelos Químicos
Chuvas
Poluentes Químicos da Água/química
[Mh] Termos MeSH secundário: Pequim
Substâncias Húmicas/análise
Águas Residuais/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Humic Substances); 0 (Waste Water); 0 (Water Pollutants, Chemical); 789U1901C5 (Copper)
[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:170308
[St] Status:MEDLINE
[do] DOI:10.1080/09593330.2017.1296893


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[PMID]:29343713
[Au] Autor:Hare VJ; Loftus E; Jeffrey A; Ramsey CB
[Ad] Endereço:Research Laboratory for Archaeology and the History of Art, School of Archaeology, University of Oxford, 1 South Parks Road, Oxford, OX1 3TG, UK. vincent.john.hare@gmail.com.
[Ti] Título:Atmospheric CO effect on stable carbon isotope composition of terrestrial fossil archives.
[So] Source:Nat Commun;9(1):252, 2018 01 17.
[Is] ISSN:2041-1723
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The C/ C ratio of C plant matter is thought to be controlled by the isotopic composition of atmospheric CO and stomatal response to environmental conditions, particularly mean annual precipitation (MAP). The effect of CO concentration on C/ C ratios is currently debated, yet crucial to reconstructing ancient environments and quantifying the carbon cycle. Here we compare high-resolution ice core measurements of atmospheric CO with fossil plant and faunal isotope records. We show the effect of pCO during the last deglaciation is stronger for gymnosperms (-1.4 ± 1.2‰) than angiosperms/fauna (-0.5 ± 1.5‰), while the contributions from changing MAP are -0.3 ± 0.6‰ and -0.4 ± 0.4‰, respectively. Previous studies have assumed that plant C/ C ratios are mostly determined by MAP, an assumption which is sometimes incorrect in geological time. Atmospheric effects must be taken into account when interpreting terrestrial stable carbon isotopes, with important implications for past environments and climates, and understanding plant responses to climate change.
[Mh] Termos MeSH primário: Atmosfera/química
Dióxido de Carbono/química
Isótopos de Carbono/análise
Clima
Fósseis
Plantas/metabolismo
[Mh] Termos MeSH secundário: Ciclo do Carbono
Isótopos de Carbono/química
Mudança Climática
Fotossíntese
Chuvas
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Carbon Isotopes); 142M471B3J (Carbon Dioxide)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180119
[St] Status:MEDLINE
[do] DOI:10.1038/s41467-017-02691-x


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[PMID]:29274215
[Au] Autor:Sayono S; Nurullita U; Sumanto D; Handoyo W
[Ad] Endereço:Department of Epidemiology, Faculty of Public Health, Universitas Muhammadiyah Semarang, Jalan Kedungmundu Raya 18, 50273, Semarang, Indonesia
[Ti] Título:Altitudinal distribution of Aedes indices during dry season in the dengue endemic area of Central Java, Indonesia
[So] Source:Ann Parasitol;63(3):213­221, 2017.
[Is] ISSN:2299-0631
[Cp] País de publicação:Poland
[La] Idioma:eng
[Ab] Resumo:Aedes mosquitoes, mainly Aedes aegypti and Aedes albopictus, are the primary and secondary vectors of dengue viruses in Indonesia, with transmission occurring by sucking blood. The density of the vectors is influenced by season and rainfall, but limited by altitude. The aim of the study is to describe the density and distribution of dengue vectors during the dry season based on the altitudes of recent dengue cases in five regencies of Central Java Province, Indonesia. Mosquito larvae and pupae were collected from the indoor and outdoor water containers from 253 houses within 50 m of houses occupied by a dengue patient. A considerable dengue vector population was found in all localities and altitudes based on the Aedes indices: an HI of 41.7% (15.0­70.6), CI of 33.6% (8.1­69.6) and BI of 57.1 (15.0­94.1). The highest indices were found in the highest altitude settlement; as the most common larval habitat in this village was a large-sized cement tank, larvivorous fish can act as effective predators in this case. This finding indicates an expansion of the dengue problem from low to high altitudes, causing a high potential for dengue transmission in all of the localities.
[Mh] Termos MeSH primário: Aedes/fisiologia
Altitude
Distribuição Animal/fisiologia
Dengue/epidemiologia
Estações do Ano
[Mh] Termos MeSH secundário: Animais
Dengue/transmissão
Seres Humanos
Indonésia
Mosquitos Vetores
Chuvas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171224
[St] Status:MEDLINE
[do] DOI:10.17420/ap6303.108


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[PMID]:29478646
[Au] Autor:Minomo K; Ohtsuka N; Nojiri K; Matsumoto R
[Ad] Endereço:Center for Environmental Science in Saitama, Kazo, Saitama 347-0115, Japan. Electronic address: minomo.kotaro@pref.saitama.lg.jp.
[Ti] Título:Influence of combustion-originated dioxins in atmospheric deposition on water quality of an urban river in Japan.
[So] Source:J Environ Sci (China);64:245-251, 2018 Feb.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Bulk (wet and dry) deposition samples were collected in Saitama Prefecture, Japan throughout a year (February 8, 2012 to February 7, 2013) to estimate the influence of dioxins emitting from waste incinerators on river water quality. The annual deposition flux of dioxins was 3.3ng-toxic equivalent (TEQ)/m /year. Source identification using indicative congeners estimated that 82% of dioxin TEQ in the bulk deposition (2.7ng-TEQ/m /year) was combustion-originated, indicating that most of the dioxins in the deposition were derived from waste incinerators. In Saitama prefecture the annual flux of combustion-originated dioxins in depositions was apparently consistent with that of dioxin emission into the air from waste incinerators. The TEQ of combustion-originated dioxins in the deposition per rainfall was 2.4pg-TEQ/L on annual average, exceeding the environmental quality standard (EQS) for water in Japan of 1pg-TEQ/L. This suggests there is a possibility that dioxins in atmospheric deposition have a significant influence on the water quality of urban rivers which rainwater directly flows into because of many paved areas in the basins. The influence of combustion-originated dioxin in the deposition on the water quality of Ayase River, an urban river heavily polluted with dioxins, was estimated at 0.29pg-TEQ/L on annual average in 2015. It seems that dioxins in atmospheric deposition from waste incinerators have a significant influence on water quality of some urban rivers via rainwater though the dioxins in the ambient air have achieved the EQS for atmosphere at all monitoring sites in Japan.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/análise
Atmosfera/química
Dioxinas/análise
Monitoramento Ambiental
Incineração
[Mh] Termos MeSH secundário: Japão
Chuvas/química
Rios/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants); 0 (Dioxins)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180227
[St] Status:MEDLINE


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[PMID]:29329353
[Au] Autor:Xu X; Gao P; Zhu X; Guo W; Ding J; Li C
[Ad] Endereço:Jiangsu Provincial Key Lab of Crop Genetics and Physiology/Wheat Research Institute, Yangzhou University, Yangzhou, Jiangsu Province, China.
[Ti] Título:Estimating the responses of winter wheat yields to moisture variations in the past 35 years in Jiangsu Province of China.
[So] Source:PLoS One;13(1):e0191217, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Jiangsu is an important agricultural province in China. Winter wheat, as the second major grain crop in the province, is greatly affected by moisture variations. The objective of this study was to investigate whether there were significant trends in changes in the moisture conditions during wheat growing seasons over the past decades and how the wheat yields responded to different moisture levels by means of a popular drought index, the Standardized Precipitation Evapotranspiration Index (SPEI). The study started with a trend analysis and quantification of the moisture conditions with the Mann-Kendall test and Sen's Slope method, respectively. Then, correlation analysis was carried out to determine the relationship between de-trended wheat yields and multi-scalar SPEI. Finally, a multivariate panel regression model was established to reveal the quantitative yield responses to moisture variations. The results showed that the moisture conditions in Jiangsu were generally at a normal level, but this century appeared slightly drier in because of the relatively high temperatures. There was a significant correlation between short time scale SPEI values and wheat yields. Among the three critical stages of wheat development, the SPEI values in the late growth stage (April-June) had a closer linkage to the yields than in the seedling stage (October-November) and the over-wintering stage (December-February). Moreover, the yield responses displayed an asymmetric characteristic, namely, moisture excess led to higher yield losses compared to moisture deficit in this region. The maximum yield increment could be obtained under the moisture level of slight drought according to the 3-month SPEI at the late growth stage, while extreme wetting resulted in the most severe yield losses. The moisture conditions in the first 15 years of the 21st century were more favorable than in the last 20 years of the 20th century for wheat production in Jiangsu.
[Mh] Termos MeSH primário: Secas
Chuvas
Triticum/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: China
Secas/história
Grãos Comestíveis/crescimento & desenvolvimento
Grãos Comestíveis/história
Aquecimento Global/história
História do Século XX
História do Século XXI
Modelos Biológicos
Análise de Regressão
Estações do Ano
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180226
[Lr] Data última revisão:
180226
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180113
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191217


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[PMID]:29237605
[Au] Autor:Jena AB; Olenski AR; Molitor D; Miller N
[Ad] Endereço:Department of Health Care Policy, Harvard Medical School Boston, MA 02115, USA; Department of Medicine, Massachusetts General Hospital, Boston, MA, USA; National Bureau of Economic Research, Cambridge, MA, USA jena@hcp.med.harvard.edu.
[Ti] Título:Association between rainfall and diagnoses of joint or back pain: retrospective claims analysis.
[So] Source:BMJ;359:j5326, 2017 12 13.
[Is] ISSN:1756-1833
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:OBJECTIVE: To study the relation between rainfall and outpatient visits for joint or back pain in a large patient population. DESIGN: Observational study. SETTING: US Medicare insurance claims data linked to rainfall data from US weather stations. PARTICIPANTS: 1 552 842 adults aged ≥65 years attending a total of 11 673 392 outpatient visits with a general internist during 2008-12. MAIN OUTCOME MEASURES: The proportion of outpatient visits for joint or back pain related conditions (rheumatoid arthritis, osteoarthritis, spondylosis, intervertebral disc disorders, and other non-traumatic joint disorders) was compared between rainy days and non-rainy days, adjusting for patient characteristics, chronic conditions, and geographic fixed effects (thereby comparing rates of joint or back pain related outpatient visits on rainy days versus non-rainy days within the same area). RESULTS: Of the 11 673 392 outpatient visits by Medicare beneficiaries, 2 095 761 (18.0%) occurred on rainy days. In unadjusted and adjusted analyses, the difference in the proportion of patients with joint or back pain between rainy days and non-rainy days was significant (unadjusted, 6.23% 6.42% of visits, P<0.001; adjusted, 6.35% 6.39%, P=0.05), but the difference was in the opposite anticipated direction and was so small that it is unlikely to be clinically meaningful. No statistically significant relation was found between the proportion of claims for joint or back pain and the number of rainy days in the week of the outpatient visit. No relation was found among a subgroup of patients with rheumatoid arthritis. CONCLUSION: In a large analysis of older Americans insured by Medicare, no relation was found between rainfall and outpatient visits for joint or back pain. A relation may still exist, and therefore larger, more detailed data on disease severity and pain would be useful to support the validity of this commonly held belief.
[Mh] Termos MeSH primário: Artralgia/epidemiologia
Dor nas Costas/epidemiologia
Chuvas
[Mh] Termos MeSH secundário: Idoso
Idoso de 80 Anos ou mais
Artralgia/etiologia
Dor nas Costas/etiologia
Bases de Dados Factuais
Feminino
Seres Humanos
Masculino
Medicare
Pacientes Ambulatoriais/estatística & dados numéricos
Estudos Retrospectivos
Estados Unidos
[Pt] Tipo de publicação:JOURNAL ARTICLE; OBSERVATIONAL STUDY; RESEARCH SUPPORT, N.I.H., EXTRAMURAL
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180226
[Lr] Data última revisão:
180226
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:171215
[St] Status:MEDLINE
[do] DOI:10.1136/bmj.j5326


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[PMID]:29370186
[Au] Autor:Zhang D; Li R; Batchelor WD; Ju H; Li Y
[Ad] Endereço:College of Agronomy, Hebei Agricultural University, Baoding, Hebei, China.
[Ti] Título:Evaluation of limited irrigation strategies to improve water use efficiency and wheat yield in the North China Plain.
[So] Source:PLoS One;13(1):e0189989, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The North China Plain is one of the most important grain production regions in China, but is facing serious water shortages. To achieve a balance between water use and the need for food self-sufficiency, new water efficient irrigation strategies need to be developed that balance water use with farmer net return. The Crop Environment Resource Synthesis Wheat (CERES-Wheat model) was calibrated and evaluated with two years of data which consisted of 3-4 irrigation treatments, and the model was used to investigate long-term winter wheat productivity and water use from irrigation management in the North China Plain. The calibrated model simulated accurately above-ground biomass, grain yield and evapotranspiration of winter wheat in response to irrigation management. The calibrated model was then run using weather data from 1994-2016 in order to evaluate different irrigation strategies. The simulated results using historical weather data showed that grain yield and water use was sensitive to different irrigation strategies including amounts and dates of irrigation applications. The model simulated the highest yield when irrigation was applied at jointing (T9) in normal and dry rainfall years, and gave the highest simulated yields for irrigation at double ridge (T8) in wet years. A single simulated irrigation at jointing (T9) produced yields that were 88% compared to using a double irrigation treatment at T1 and T9 in wet years, 86% of that in normal years, and 91% of that in dry years. A single irrigation at jointing or double ridge produced higher water use efficiency because it obtained higher evapotranspiration. The simulated farmer irrigation practices produced the highest yield and net income. When the cost of water was taken into account, limited irrigation was found to be more profitable based on assumptions about future water costs. In order to increase farmer income, a subsidy will likely be needed to compensate farmers for yield reductions due to water savings. These results showed that there is a cost to the farmer for water conservation, but limiting irrigation to a single irrigation at jointing would minimize impact on farmer net return in North China Plain.
[Mh] Termos MeSH primário: Irrigação Agrícola/métodos
Conservação dos Recursos Naturais/métodos
Produtos Agrícolas/crescimento & desenvolvimento
Triticum/crescimento & desenvolvimento
[Mh] Termos MeSH secundário: Biomassa
Calibragem
China
Produtos Agrícolas/economia
Modelos Teóricos
Chuvas
[Pt] Tipo de publicação:EVALUATION STUDIES; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180222
[Lr] Data última revisão:
180222
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180126
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189989


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[PMID]:29214358
[Au] Autor:Gao M; Shen H; Han X; Li H; Zhang L
[Ad] Endereço:School of Resource and Environmental Sciences, Wuhan University, Wuhan, Hubei, 430079, China.
[Ti] Título:Multiple timescale analysis of the urban heat island effect based on the Community Land Model: a case study of the city of Xi'an, China.
[So] Source:Environ Monit Assess;190(1):8, 2017 Dec 06.
[Is] ISSN:1573-2959
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Urban heat islands (UHIs) are the phenomenon of urban regions usually being warmer than rural regions, which significantly impacts both the regional ecosystem and societal activities. Numerical simulation can provide spatially and temporally continuous datasets for UHI analysis. In this study, a spatially and temporally continuous ground temperature dataset of Xi'an, China was obtained through numerical simulation based on the Community Land Model version 4.5 (CLM4.5), at a temporal resolution of 30 min and a spatial resolution of 0.05 × 0.05 . Based on the ground temperature, the seasonal average UHI intensity (UHII) was calculated and the seasonal variation of the UHI effect was analyzed. The monthly variation tendency of the urban heat stress was also investigated. Based on the diurnal cycle of ground temperature and the UHI effect in each season, the variation tendencies of the maximum, minimum, and average UHII were analyzed. The results show that the urban heat stress in summer is the strongest among all four seasons. The heat stress in urban areas is very significant in July, and the UHII is the weakest in January. Regarding the diurnal cycle of UHII, the maximum always appears at 06:30 UTC to 07:30 UTC, while the minimum intensity of the UHI effect occurs at different times in the different seasons. The results of this study could provide a reference for policymakers about how to reduce the damage caused by heat stress.
[Mh] Termos MeSH primário: Cidades
Monitoramento Ambiental
Temperatura Alta
Estações do Ano
[Mh] Termos MeSH secundário: China
Ritmo Circadiano
Clima
Simulação por Computador
Monitoramento Ambiental/métodos
Seres Humanos
Chuvas
População Rural
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180222
[Lr] Data última revisão:
180222
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171208
[St] Status:MEDLINE
[do] DOI:10.1007/s10661-017-6320-9


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[PMID]:29293693
[Au] Autor:Tovar C; Sánchez Infantas E; Teixeira Roth V
[Ad] Endereço:Departamento de Biología, Facultad de Ciencias, Universidad Nacional Agraria La Molina, Av. La Molina s/n, Lima, Peru.
[Ti] Título:Plant community dynamics of lomas fog oasis of Central Peru after the extreme precipitation caused by the 1997-98 El Niño event.
[So] Source:PLoS One;13(1):e0190572, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Despite El Niño events being one of the main forces shaping the coastal desert vegetation in South America, the impacts of the high precipitation typical of this rare but recurrent climatic event remain understudied. Here we monitored the plant community of a coastal lomas, a seasonal desert ecosystem, during 1998 and 2001 to analyse its changes during the 1997-98 El Niño and the following La Niña events. We measured species abundance and vegetation cover in 31 plots, and recorded climate variables in Lomas de Lachay, Peru. We found a significant positive correlation between precipitation and vegetation cover, density, alpha diversity (species diversity at the plot level), total richness and abundance of several key species but no correlation with gamma diversity (species diversity at the whole loma level). During the El Niño event, the seasonality, typical of the lomas ecosystem, disappeared, as evidenced by both the similarity of species composition and mean vegetation cover values between most sampling campaigns of 1998 and 1999. Moreover, total richness was lower during the El Niño event than during the humid season of 2000 and 2001 resulting from the dominance of only a few species, such as Nicotiana paniculata and Loasa urens. Temporal-spatial changes in the abundance of the dominant species caused the differences between alpha and gamma diversity, especially during 1999. Within that year, mean alpha diversity showed similar values whilst gamma diversity values were different. The reestablishment of the seasonality of most plant community characteristics and a clear difference between species composition of the humid and the dry season occurred two years after the El Niño event, suggesting a resilient community. This study provides one of the few quantifications of the Peruvian lomas' response to the 1997-98 El Niño event and the following La Niña, one of the most extreme climatic events in the last century.
[Mh] Termos MeSH primário: El Niño Oscilação Sul
Chuvas
Tempo (Meteorologia)
[Mh] Termos MeSH secundário: Biodiversidade
Clima
Ecossistema
Peru
Plantas/classificação
Estações do Ano
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180221
[Lr] Data última revisão:
180221
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180103
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0190572



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