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Zhang L, Liao Q, Gao R, Luo R, Liu C, Zhong J, Wang Z. Spatial variations in diffusive methane fluxes and the role of eutrophication in a subtropical shallow lake. Sci Total Environ 2021; 759:143495. [PMID: 33213906 DOI: 10.1016/j.scitotenv.2020.143495] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 10/25/2020] [Accepted: 10/25/2020] [Indexed: 06/11/2023]
Abstract
Shallow lakes account for most of the diffusive CH4 emissions from global lakes, and they also suffer from eutrophication worldwide. Determining the effect of eutrophication on diffusive CH4 fluxes is fundamental to understanding CH4 emissions in shallow lakes. This study aimed to investigate the spatial variations in diffusive CH4 fluxes and explore the role of eutrophication in Lake Chaohu, a large and shallow eutrophic lake in the lower reaches of the Yangtze River. A one-year field observation was carried out to examine CH4 concentrations in the sediment and water and the diffusive fluxes of CH4 across the sediment-water interface (Fs-w) and water-air interface (Fw-a). Both Fs-w (0.306-1.56 mmol m-2 d-1) and Fw-a (0.097-0.529 mmol m-2 d-1) were upward and showed significant spatial heterogeneity and were significantly positively correlated. Parameters related to eutrophication had significant positive relationships with Fw-a, and the total phosphorus distribution in the water explained the greatest proportion of the spatial variation in Fw-a. Distance to shore and water depth were inversely correlated with Fw-a and modified the effects of eutrophication. Overall, the results provide direct evidence of the key role of eutrophication in shaping the spatial distribution of diffusive CH4 fluxes and a scientific basis for predicting changes in CH4 emissions with future eutrophication changes in shallow lakes in subtropical zones.
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Affiliation(s)
- Lei Zhang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China.
| | - Qianjiahua Liao
- Department of Environmental Science, China Pharmaceutical University, Nanjing 211198, PR China
| | - Rui Gao
- Chaohu Lake Research Institute, Hefei 230601, PR China
| | - Ran Luo
- Department of Environmental Science, China Pharmaceutical University, Nanjing 211198, PR China
| | - Cheng Liu
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China
| | - Jicheng Zhong
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China
| | - Zhaode Wang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, PR China
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Roveri V, Guimarães LL, Toma W, Correia AT. Occurrence and risk assessment of pharmaceuticals and cocaine around the coastal submarine sewage outfall in Guarujá, São Paulo State, Brazil. Environ Sci Pollut Res Int 2021; 28:11384-11400. [PMID: 33123891 DOI: 10.1007/s11356-020-11320-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 10/18/2020] [Indexed: 06/11/2023]
Abstract
The aim of this study was to screen and quantify 23 pharmaceutical compounds (including illicit drugs), at two sampling points near the diffusers of the Guarujá submarine outfall, State of São Paulo, Brazil. Samples were collected in triplicate during the high (January 2018) and low (April 2018) seasons at two different water column depths (surface and bottom). A total of 10 compounds were detected using liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS). Caffeine (42.3-141.0 ng/L), diclofenac (3.6-85.7 ng/L), valsartan (4.7-14.3 ng/L), benzoylecgonine (0.3-1.7 ng/L), and cocaine (0.3-0.6 ng/L) were frequently detected (75% occurrence). Orphenadrine (0.6-3.0 ng/L) and atenolol (0.1-0.3 ng/L), and acetaminophen (1.2-1.4 ng/L) and losartan (0.7-3.4 ng/L), were detected in 50% and 25% of the samples, respectively. Only one sample (12.5%) detected the presence of carbamazepine (< 0.001-0.1 ng/L). Unexpectedly a lower frequency of occurrence and concentration of these compounds occurred during the summer season, suggesting that other factors, such as the oceanographic and hydrodynamic regimes of the study area, besides the population rise, should be taken into account. Caffeine presented concentrations above the surface water safety limits (0.01 μg/L). For almost all compounds, the observed concentrations indicate nonenvironmental risk for the aquatic biota, except for caffeine, diclofenac, and acetaminophen that showed low to moderate ecological risk for the three trophic levels tested.
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Affiliation(s)
- Vinicius Roveri
- Faculdade de Ciência e Tecnologia (FCT), Universidade Fernando Pessoa (UFP), Praça 9 de Abril 349, 4249-004, Porto, Portugal
- Universidade Metropolitana de Santos (UNIMES), Avenida Conselheiro Nébias, 536, Encruzilhada, Santos, São Paulo, 11045-002, Brazil
- Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Avenida General Norton de Matos S/N, 4450-208, Matosinhos, Portugal
| | - Luciana Lopes Guimarães
- Laboratório de Pesquisa em Produtos Naturais, Universidade Santa Cecília (UNISANTA), Rua Cesário Mota 8, F83A, Santos, São Paulo, 11045-040, Brazil
| | - Walber Toma
- Laboratório de Pesquisa em Produtos Naturais, Universidade Santa Cecília (UNISANTA), Rua Cesário Mota 8, F83A, Santos, São Paulo, 11045-040, Brazil
| | - Alberto Teodorico Correia
- Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Avenida General Norton de Matos S/N, 4450-208, Matosinhos, Portugal.
- Faculdade de Ciências da Saúde (FCS), Universidade Fernando Pessoa (UFP), Rua Carlos da Maia 296, 4200-150, Porto, Portugal.
- Instituto Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto (UP), Rua Jorge Viterbo Ferreira 228, 4050-313, Porto, Portugal.
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Xu Y, Dai J, Ge Q, Wang H, Tao Z. Comparison of chilling and heat requirements for leaf unfolding in deciduous woody species in temperate and subtropical China. Int J Biometeorol 2021; 65:393-403. [PMID: 32880063 DOI: 10.1007/s00484-020-02007-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 08/16/2020] [Accepted: 08/24/2020] [Indexed: 05/21/2023]
Abstract
Climate warming has advanced the spring phenology of many plant species by accelerating heat accumulation. However, delayed phenophases due to insufficient chilling have also been reported. Based on phenological observation data (1963-2010), we compared the effects of preseason chill and heat accumulation on leaf unfolding dates of four deciduous woody species (Lagerstroemia indica, Robinia pseudoacacia, Sophora japonica, and Ulmus pumila) in temperate and subtropical regions of China. Daily chill and heat accumulation were calculated by two chilling models (the Positive Utah Model and the Dynamic Model) and the Growing Degree Hour (GDH) Model. We determined the temporal trends in chill and heat accumulations for leaf unfolding of the four species. The results showed that there were shorter chilling periods in the subtropics than in temperate sites because the chilling period typically started later and ended earlier. There was no significant difference in the length of the forcing period in the different regions. The chilling requirements for leaf unfolding were higher in temperate regions (1344.9-1798.9 chilling units (CU) or 64.7-79.4 chilling portions (CP)) than in the subtropics (1145.9-1828.1 CU or 47.9-75.2 CP). Plants in the subtropics needed higher forcing temperatures (4135.8-10084.8 GDH) than those in temperate regions (3292.0-8383.6 GDH). The earlier-leafing species (e.g., U. pumila) had a lower heat requirement for leaf unfolding than the later-leafing species (e.g., L. indica). A significant increase in heat accumulation was found at all sites except Guiyang, while chill accumulation only increased in Beijing.
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Affiliation(s)
- Yunjia Xu
- Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Junhu Dai
- Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.
- University of Chinese Academy of Sciences, Beijing, China.
| | - Quansheng Ge
- Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Huanjiong Wang
- Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
| | - Zexing Tao
- Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China.
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Pereira CDS, Maranho LA, Cortez FS, Pusceddu FH, Santos AR, Ribeiro DA, Cesar A, Guimarães LL. Occurrence of pharmaceuticals and cocaine in a Brazilian coastal zone. Sci Total Environ 2016; 548-549:148-154. [PMID: 26802343 DOI: 10.1016/j.scitotenv.2016.01.051] [Citation(s) in RCA: 113] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Revised: 01/09/2016] [Accepted: 01/09/2016] [Indexed: 05/20/2023]
Abstract
The present study determined environmental concentrations of pharmaceuticals, cocaine, and the main human metabolite of cocaine in seawater sampled from a subtropical coastal zone (Santos, Brazil). The Santos Bay is located in a metropolitan region and receives over 7367m(3) of wastewater per day. Five sample points under strong influence of the submarine sewage outfall were chosen. Through quantitative analysis by LC-MS/MS, 33 compounds were investigated. Seven pharmaceuticals (atenolol, acetaminophen, caffeine, losartan, valsartan, diclofenac, and ibuprofen), an illicit drug (cocaine), and its main human metabolite (benzoylecgonine) were detected at least once in seawater sampled from Santos Bay at concentrations that ranged from ng·L(-1) to μg·L(-1). In light of the possibility of bioaccumulation and harmful effects, the high concentrations of pharmaceuticals and cocaine found in this marine subtropical ecosystem are of environmental concern.
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Affiliation(s)
- Camilo D Seabra Pereira
- Departamento de Ciências do Mar, Universidade Federal de São Paulo, Av. Saldanha da Gama n.89, 11030-400 Santos, SP, Brazil; Laboratório de Ecotoxicologia, Universidade Santa Cecília, Rua Oswaldo Cruz 266, 11045-907 Santos, SP, Brazil.
| | - Luciane A Maranho
- Departamento de Ciências do Mar, Universidade Federal de São Paulo, Av. Saldanha da Gama n.89, 11030-400 Santos, SP, Brazil
| | - Fernando S Cortez
- Laboratório de Ecotoxicologia, Universidade Santa Cecília, Rua Oswaldo Cruz 266, 11045-907 Santos, SP, Brazil
| | - Fabio H Pusceddu
- Laboratório de Ecotoxicologia, Universidade Santa Cecília, Rua Oswaldo Cruz 266, 11045-907 Santos, SP, Brazil
| | - Aldo R Santos
- Laboratório de Ecotoxicologia, Universidade Santa Cecília, Rua Oswaldo Cruz 266, 11045-907 Santos, SP, Brazil
| | - Daniel A Ribeiro
- Departamento de Biociências, Universidade Federal de São Paulo, Av. Ana Costa 95, 11060-001 Santos, SP, Brazil
| | - Augusto Cesar
- Departamento de Ciências do Mar, Universidade Federal de São Paulo, Av. Saldanha da Gama n.89, 11030-400 Santos, SP, Brazil; Laboratório de Ecotoxicologia, Universidade Santa Cecília, Rua Oswaldo Cruz 266, 11045-907 Santos, SP, Brazil
| | - Luciana L Guimarães
- Laboratório de Pesquisa em Produtos Naturais, PPG em Sustentabilidade de Ecossistemas Costeiros e Marinhos, Universidade Santa Cecília, Rua Cesário Mota 8, 11045-040 Santos, SP, Brazil
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