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Novais MH, Penha AM, Catarino A, Martins I, Fialho S, Lima A, Morais M, Palma P. The usefulness of ecotoxicological tools to improve the assessment of water bodies in a climate change reality. Sci Total Environ 2023; 901:166392. [PMID: 37597569 DOI: 10.1016/j.scitotenv.2023.166392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 07/22/2023] [Accepted: 08/16/2023] [Indexed: 08/21/2023]
Abstract
This study aimed to analyse the added value of using ecotoxicological tools to complement and improve the assessment of natural water bodies status, in situations of climate change, with a higher frequency of extreme events as floods or droughts. Four water bodies of streams in the Guadiana Basin (Álamos, Amieira, Lucefécit, Zebro) were studied in 2017 and 2018 and classified based on the Water Framework Directive (WFD) parameters: Biological Quality Element - Phytobenthos (diatoms), General chemical and physicochemical elements, Specific pollutants, and Priority Substances. Complementarily, bioassays (including lethal and sublethal parameters) were carried out with organisms of different trophic levels: (i) the bacteria Aliivibrio fischeri; (ii) the microalgae Pseudokirchneriella subcapitata; (iii) the crustaceans Daphnia magna, Thamnocephalus platyurus and Heterocypris incongruens. A classification system with 5 scores was developed, permitting to classify water bodies from non-toxic (EC50 > 100 %; growth and feeding rate > 80 %; blue) to highly toxic (EC50 < 10 %; growth and feeding rate < 10 %; red). The comparison between the classification based on the WFD parameters and on ecotoxicological endpoints showed similar results for 71 % of the samples, and significant positive Pearson correlations were detected between the diatom-based Specific Polluosensitivity Index (SPI) and EC50V.fisheri, the algae growth rate and Shannon diversity index. These results indicate that when the biological quality elements cannot be used (namely under drought or flooding conditions) the application of ecotoxicological bioassays may be a good alternative. Further, when ecotoxicological parameters were included, an increase of worse classifications (Bad and Poor) was observed, revealing an improvement in the sensitivity of the classification, mainly in presence of specific and priority substances. So, the ecotoxicological analysis appears to provide useful information regarding the potential presence of both known and unknown contaminants at concentrations that cause biological effects (even within the WFD limits), in agreement with several authors that have already suggested its use in biomonitoring.
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Affiliation(s)
- M H Novais
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala N(o) 1, 7005-345 Évora, Portugal.
| | - A Marchã Penha
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala N(o) 1, 7005-345 Évora, Portugal
| | - A Catarino
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal; Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal
| | - I Martins
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal
| | - S Fialho
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal
| | - A Lima
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal
| | - M Morais
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala N(o) 1, 7005-345 Évora, Portugal
| | - P Palma
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal; Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal; GeoBioTec, NOVA School of Science and Technology, Campus da Caparica, 2829-516 Caparica, Portugal
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Palma P, Penha AM, Novais MH, Fialho S, Lima A, Catarino A, Mourinha C, Alvarenga P, Iakunin M, Rodrigues G, Potes M, Morais M, Costa MJ, Salgado R. Integrative toolbox to assess the quality of freshwater sediments contaminated with potentially toxic metals. Environ Res 2023; 217:114798. [PMID: 36427636 DOI: 10.1016/j.envres.2022.114798] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 07/23/2022] [Revised: 10/20/2022] [Accepted: 11/10/2022] [Indexed: 05/16/2023]
Abstract
The Guadiana Basin is a transnational basin, presenting historical contamination with potentially toxic metals (PTM), which origin can be both natural and anthropogenic. This study explores the use of a set of observational, chemical and ecotoxicological assays with Heterocypris incongruens, Vibrio fischeri, Pseudokirchneriella subcapitata, Thamnocephalus platyurus, identifying the most sensitive to be included in a toolbox to analyze the quality of freshwater sediments related to this type of contamination. The study included the analysis of a reservoir and streams sediments of Guadiana basin, in two consecutive years with different climate conditions 2017 (dry year) and 2018 (normal year). The results showed high chemical variability along the basin, with greater contamination with PTM in the reservoir sediments. The calculated Enrichment Factors (EF) indicated high anthropogenic contamination by Cd, followed by Pb (EF > 1.5). The geoaccumulation index (Igeo) revealed that the sediments were severely polluted with Cd, and slightly polluted with Pb and Cu, inducing a higher sublethal toxicity to Heterocypris incongruens. Among the parameters evaluated, and after the use of multivariate statistical techniques, the toolbox for assessing sediments quality, in similar climate and geological conditions, should include the analysis of: meteorology, land use/cover in the area, granulometry, organic matter content, PTM concentrations, contamination indices (e.g., Igeo and EF), and sublethal bioassays with H. incongruens (total sediment analysis) and Vibrio fisheri luminescence inhibition (pore water analysis).
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Affiliation(s)
- Patrícia Palma
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal; ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal.
| | - Alexandra Marchã Penha
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E, Rua da Barba Rala No. 1, 7005-345, Évora, Portugal
| | - Maria Helena Novais
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E, Rua da Barba Rala No. 1, 7005-345, Évora, Portugal
| | - Sofia Fialho
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal
| | - Ana Lima
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal
| | - Adriana Catarino
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal
| | - Clarisse Mourinha
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal
| | - Paula Alvarenga
- Linking Landscape, Environment, Agriculture, and Food Research Unit (LEAF), Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017, Lisboa, Portugal
| | - Maksim Iakunin
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal
| | - Gonçalo Rodrigues
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal
| | - Miguel Potes
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal
| | - Manuela Morais
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E, Rua da Barba Rala No. 1, 7005-345, Évora, Portugal; Science and Technology School, University of Évora, Évora, Portugal
| | - Maria João Costa
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal; Science and Technology School, University of Évora, Évora, Portugal
| | - Rui Salgado
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal; Science and Technology School, University of Évora, Évora, Portugal
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Várbíró G, Borics G, Novais MH, Morais MM, Rimet F, Bouchez A, Tapolczai K, Bácsi I, Usseglio-Polatera P, B-Béres V. Environmental filtering and limiting similarity as main forces driving diatom community structure in Mediterranean and continental temporary and perennial streams. Sci Total Environ 2020; 741:140459. [PMID: 32887020 DOI: 10.1016/j.scitotenv.2020.140459] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 03/24/2020] [Revised: 06/07/2020] [Accepted: 06/21/2020] [Indexed: 06/11/2023]
Abstract
Climatic extreme events such as droughts (unpredictable), dry periods (predictable) or even flush floods, threaten freshwater ecosystems worldwide. The filtering mechanisms of these events and their strength on communities, however, can be different among regions. While time-for-adaptation theory defines whether or not water scarcity can be considered as disturbance, the stress-dominance theory predicts an increase in importance of environmental filtering and a decrease in the role of biotic interactions in communities with increasing environmental stress. Here, we tested whether environmental filtering (leading to trait convergence) or limiting similarity (leading to trait divergence) is the main assembly rule shaping the structure and trait composition of benthic diatom assemblages in Mediterranean (Portuguese) and continental (Hungarian) temporary and perennial streams. We assumed that the trait composition of diatom assemblages in the two stream types would be less different in the Mediterranean than in the continental region (addressed to time-for-adaptation theory). We also hypothesized that trait composition would be shaped by environmental filtering in the Hungarian streams while by biotic interactions in Portuguese streams (addressed to stress-dominance theory). Our results supported our first hypothesis since traits, which associated primarily to temporary streams were found only in the continental region. Our findings, however, only partially proved the stress-dominance hypothesis. In the continental region, where drying up of streams were induced by unpredictable droughts, biotic interactions were the main assembly rules shaping community structure. In contrast, environmental filtering was nearly as important as limiting similarity in structuring trait composition in the Mediterranean region during the predictable dry phase with no superficial flow. These analyses also highlighted that drought events (both predictable and unpredictable ones) have a complex and strong influence on benthic diatom assemblages resulting even in irreversible changes in trait composition and thereby in ecosystem functioning.
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Affiliation(s)
- Gábor Várbíró
- MTA Centre for Ecological Research, Danube Research Institute, Department of Tisza Research, 18/c. Bem square, 4026 Debrecen, Hungary; MTA Centre for Ecological Research, GINOP Sustainable Ecosystems Group, 3. Klebelsberg Kuno str., H-8237 Tihany, Hungary.
| | - Gábor Borics
- MTA Centre for Ecological Research, Danube Research Institute, Department of Tisza Research, 18/c. Bem square, 4026 Debrecen, Hungary; MTA Centre for Ecological Research, GINOP Sustainable Ecosystems Group, 3. Klebelsberg Kuno str., H-8237 Tihany, Hungary.
| | - Maria Helena Novais
- Renewable Energies Chair, University of Évora, Casa Cordovil, Rua D. Augusto Eduardo Nunes n 7, Évora, 7000-651, Portugal; Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho no. 59, 7000-671 Évora, Portugal.
| | - Maria Manuela Morais
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho no. 59, 7000-671 Évora, Portugal; Water Laboratory, Rua da Barba Rala, n.° 1, Parque Industrial e Tecnológico de Évora, 7005-345, Évora, Portugal.
| | - Frédéric Rimet
- UMR CARRTEL, INRAE, Université de Savoie Mont-Blanc, Thonon-les-Bains, France.
| | - Agnès Bouchez
- UMR CARRTEL, INRAE, Université de Savoie Mont-Blanc, Thonon-les-Bains, France.
| | - Kálmán Tapolczai
- Department of Limnology, University of Pannonia, H-8200 Veszprém, Egyetem u. 10, Hungary; Hungarian Academy of Sciences, Premium Postdoctoral Research Program, H-1051 Budapest, Nádor u. 7, Hungary.
| | - István Bácsi
- University of Debrecen, Department of Hydrobiology, P.O. Box 57, H-4010 Debrecen, Hungary.
| | | | - Viktória B-Béres
- MTA Centre for Ecological Research, Danube Research Institute, Department of Tisza Research, 18/c. Bem square, 4026 Debrecen, Hungary; MTA Centre for Ecological Research, GINOP Sustainable Ecosystems Group, 3. Klebelsberg Kuno str., H-8237 Tihany, Hungary.
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Novais MH, Morales EA, Penha AM, Potes M, Bouchez A, Barthès A, Costa MJ, Salgado R, Santos J, Morais M. Benthic diatom community dynamics in Mediterranean intermittent streams: Effects of water availability and their potential as indicators of dry-phase ecological status. Sci Total Environ 2020; 719:137462. [PMID: 32143097 DOI: 10.1016/j.scitotenv.2020.137462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [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: 11/29/2019] [Revised: 02/02/2020] [Accepted: 02/19/2020] [Indexed: 06/10/2023]
Abstract
The study of intermittent rivers is a critical and timely issue due to their worldwide increase, triggered by several causes including climate change. The need to understand the response of intermittent river biota to water intermittency led us to conduct this study using benthic diatoms collected in southern Portugal. Benthic diatoms were explored in terms of assemblages, diversity indices, the Specific Pollution Sensitivity (SPI) Index, functional metrics (i.e. ecological guilds and life-forms) and conservation status. We verified that changes in water physico-chemical characteristics were highly controlled by flow intermittency, which in turn is directly linked to meteorological variables (air temperature and precipitation). Changes in diatom assemblages reflect the aquatic regime of sites, changes in aquatic states through time and mesohabitats (dry biofilm, samples collected in pools or under flowing conditions). Species richness, on the other hand, did not reflect these differences, whilst Shannon diversity and Pielou's Evenness indices only reflected mesohabitat differences. The SPI distinguished sampling periods, and mesohabitats. The relative abundance of ecological guilds changed with aquatic states, with the low-profile guild dominating in eurheic and arheic conditions (except during Summer), being replaced by motile taxa in summer arheic conditions, reflecting increases in nutrient and siltation. The hypothesis that benthic diatom assemblages in dry biofilm can be used as an indicator of ecological status during the dry-phase was validated, since no differences between the Ecological Quality Ratio determined in dry biofilm collected in Summer 2017 and the previous Spring 2017 in flowing water. A method is proposed for diatom sampling in dry biofilm, contributing to an integrated ecological status evaluation, which considers the dry-phase and enhances the reach of biomonitoring programs.
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Affiliation(s)
- Maria Helena Novais
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Renewable Energies Chair, University of Évora, Casa Cordovil, Rua D. Augusto Eduardo Nunes nº7, Évora, 7000-651, Portugal.
| | - Eduardo A Morales
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala No. 1, 7005-345 Évora, Portugal
| | - Alexandra Marchã Penha
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala No. 1, 7005-345 Évora, Portugal
| | - Miguel Potes
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal
| | | | | | - Maria João Costa
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Department of Physics, ECT, University of Évora, Rua Romão Ramalho n° 59, 7000-671 Évora, Portugal
| | - Rui Salgado
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Department of Physics, ECT, University of Évora, Rua Romão Ramalho n° 59, 7000-671 Évora, Portugal
| | - Jorge Santos
- Department of Mathematics, ECT, University of Évora, Rua Romão Ramalho n° 59, 7000-671 Évora, Portugal; CIMA - Research Centre for Mathematics and Applications, IIFA, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal
| | - Manuela Morais
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala No. 1, 7005-345 Évora, Portugal
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Palma P, Fialho S, Lima A, Novais MH, Costa MJ, Montemurro N, Pérez S, de Alda ML. Pharmaceuticals in a Mediterranean Basin: The influence of temporal and hydrological patterns in environmental risk assessment. Sci Total Environ 2020; 709:136205. [PMID: 31905561 DOI: 10.1016/j.scitotenv.2019.136205] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [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: 11/20/2019] [Revised: 12/16/2019] [Accepted: 12/17/2019] [Indexed: 05/23/2023]
Abstract
Occurrence of pharmaceuticals in the aquatic environment is nowadays a well-established issue that has become a matter of both scientific and public concern. Tons of different classes of pharmaceuticals find their way to the environment at variable degrees, after their use and excretion through wastewater and sewage treatment systems. The main goal of this study was to correlate the dynamics and the environmental risk of pharmaceuticals with different temporal and hydrological patterns, at the Guadiana Basin (South of Portugal). Water samples were collected bimonthly during 2017 (classified as a drought year) and 2018 (post-drought year) in: Zebro, Álamos and Amieira (intermittent hydrological streams), and Lucefécit (perennial hydrological stream). The pharmaceuticals quantified in higher concentrations, out of 27 investigated, were diclofenac (up to 4806 ng L-1), ibuprofen (3161 ng L-1), hydrochlorothiazide (2726 ng L-1) and carbamazepine (3223 ng L-1). Zebro and Álamos presented the highest contamination by this group of environmental hazardous substances, which may be correlated with the presence of wastewater treatment plants upstream the sampling point of each stream. Furthermore, the highest concentrations occurred mainly during the dry period (2017), when the flow was nearly inexistent in Zebro, and in Álamos after the first heavy rainfalls. In specific periods, the high concentrations of pharmaceuticals detected may induce risk for the organisms of lowest trophic levels, damaging the balance of the ecosystems at these streams. The risk quotient optimised approach (RQf) integrating exposure, toxicity and persistence factors, ranks the pharmaceuticals investigated in terms of risk for the aquatic ecosystems as follows: diclofenac, ibuprofen and carbamazepine (high risk), clarithromycin (moderate risk), acetaminophen, ofloxacin and bezafibrate (endurable risk), and hydrochlorothiazide (negligible risk).
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Affiliation(s)
- Patrícia Palma
- Escola Superior Agrária, Instituto Politécnico de Beja, 7800-295 Beja, Portugal; Instituto de Ciências da Terra (ICT), Universidade de Évora, Évora, Portugal.
| | - Sofia Fialho
- Escola Superior Agrária, Instituto Politécnico de Beja, 7800-295 Beja, Portugal
| | - Ana Lima
- Escola Superior Agrária, Instituto Politécnico de Beja, 7800-295 Beja, Portugal
| | - Maria Helena Novais
- Instituto de Ciências da Terra (ICT), Universidade de Évora, Évora, Portugal
| | - Maria João Costa
- Instituto de Ciências da Terra (ICT), Universidade de Évora, Évora, Portugal; Science and Technology School, University of Évora, Évora, Portugal
| | - Nicola Montemurro
- Water, Environmental and Food Chemistry Unit (ENFOCHEM), Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain
| | - Sandra Pérez
- Water, Environmental and Food Chemistry Unit (ENFOCHEM), Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain
| | - Miren Lopez de Alda
- Water, Environmental and Food Chemistry Unit (ENFOCHEM), Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Barcelona, Spain
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Palma P, López-Orozco R, Mourinha C, Oropesa AL, Novais MH, Alvarenga P. Assessment of the environmental impact of an abandoned mine using an integrative approach: A case-study of the "Las Musas" mine (Extremadura, Spain). Sci Total Environ 2019; 659:84-94. [PMID: 30597472 DOI: 10.1016/j.scitotenv.2018.12.321] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 10/15/2018] [Revised: 12/12/2018] [Accepted: 12/21/2018] [Indexed: 06/09/2023]
Abstract
The mine abandonment is generally associated with the release of potentially toxic metals into the environment, which may depend on metals speciation, soil properties and climate conditions. The goal of the present work was to assess the environmental impact of the abandoned Pb-Zn mine "Las Musas" (Spain) using an integrative approach. The impact on soils and surface waters was performed using: chemical parameters, quantification of potentially toxic metals (Cd, Cu, Pb and Zn), and ecotoxicological responses using lethal and sub-lethal bioassays with organisms' representative of different trophic level ((soil: Eisenia fetida (mortality and reproduction test); Latuca sativa and Lollium perenne (seedling emergence); and water: Vibrio fischeri (luminescence inhibition), Daphnia magna (immobility and reproduction test), Thamnocephalus platyurus (mortality), Pseudokirchneriella subcapitata (growth inhibition)). The results showed soils with neutral to slight alkaline pH (7.64-8.18), low electric conductivity (125-953 μS/cm) and low organic matter levels (0.20-1.85%). For most of the soil samples, Pb was the only metal which surpassed the limit proposed by the Canadian soil quality guidelines, with values ranging from 42.2 to 181.4 mg/kg. The ecotoxicological results showed that the soils with the highest levels of Pb induced a decrease on E. fetida reproduction and on L. sativa germination, indicating negative impacts on the habitat function. The analysis of the surface waters showed levels of Zn surpassing the legal limit adopted from the Water Framework Directive (37.0 to 69.0 μg/L). The ecotoxicological results highlight the importance of bioassays that evaluate the behavior of species, when assessing the risk of mining areas with non-acid soils and waters with high nutrients/organic matter concentrations and low concentrations of potentially toxic metals. The results indicated a moderate environmental risk from potentially toxic metals, at the areas analyzed around the Azuaga mine.
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Affiliation(s)
- Patrícia Palma
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal; ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal.
| | - Rocío López-Orozco
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal
| | - Clarisse Mourinha
- Department of Technologies and Applied Sciences, Polytechnic Institute of Beja, 7801-295, Portugal
| | - Ana Lourdes Oropesa
- Unidad de Toxicología, Departamento de Sanidad Animal, Facultad de Ciencias, Universidad de Extremadura, Badajoz 06071, Spain; INBIO G+C - Instituto Universitario de Investigación en Biotecnología Ganadera y Cinegética, Universidad de Extremadura, Cáceres 10003, Spain
| | - Maria Helena Novais
- ICT, Institute of Earth Sciences, University of Évora, Rua Romão Ramalho 59, Évora, Portugal
| | - Paula Alvarenga
- Linking Landscape, Environment, Agriculture, and Food Research Unit (LEAF), Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal
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Novais MH, Penha AM, Morales EA, Potes M, Salgado R, Morais M. Vertical distribution of benthic diatoms in a large reservoir (Alqueva, Southern Portugal) during thermal stratification. Sci Total Environ 2019; 659:1242-1255. [PMID: 31096337 DOI: 10.1016/j.scitotenv.2018.12.251] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 10/11/2018] [Revised: 12/15/2018] [Accepted: 12/16/2018] [Indexed: 06/09/2023]
Abstract
Freshwater diatom communities are known to respond to a wide range of environmental factors, however, the depth gradient is usually neglected and few studies are available, especially in large reservoirs. During the ALqueva hydro-meteorological EXperiment (ALEX) field campaign, diatom communities were studied in the margins and in three platforms (from the surface to the bottom of the reservoir) located in the limnetic zone of the Alqueva reservoir, one of the largest artificial lakes in western Europe. A detailed meteorological and physico-chemical characterization of the reservoir was carried out from June to September in Summer 2014, when the reservoir was stratified, to relate these variables with diatom assemblages. Despite the large dimensions of the reservoir, no differences in the water physico-chemical characteristics and diatom descriptors were detected among platforms. Small changes in diatom assemblages, ecological guilds, taxa richness and Shannon diversity index were observed between sampling campaigns. Nevertheless, differences in diatoms were detected along a depth gradient, both in terms of diatom assemblages and ecological guilds. Taxa richness, Shannon diversity index, Pielou's evenness and Specific Pollution sensitivity Index (SPI) also differed with depth, with the lowest values of all indices detected at surface samples, increasing with depth, reaching the highest values at 20 m for taxa richness, Shannon diversity and Pielou's evenness indices.
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Affiliation(s)
- Maria Helena Novais
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala No. 1, 7005-345 Évora, Portugal.
| | - Alexandra Marchã Penha
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala No. 1, 7005-345 Évora, Portugal
| | - Eduardo A Morales
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala No. 1, 7005-345 Évora, Portugal
| | - Miguel Potes
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal
| | - Rui Salgado
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Department of Physics, ECT, University of Évora, Rua Romão Ramalho n° 59, 7000-671 Évora, Portugal
| | - Manuela Morais
- Institute of Earth Sciences - ICT, University of Évora, Rua Romão Ramalho n°. 59, 7000-671 Évora, Portugal; Water Laboratory, University of Évora, P.I.T.E. Rua da Barba Rala No. 1, 7005-345 Évora, Portugal
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Hlúbiková D, Novais MH, Dohet A, Hoffmann L, Ector L. Effect of riparian vegetation on diatom assemblages in headwater streams under different land uses. Sci Total Environ 2014; 475:234-247. [PMID: 23820576 DOI: 10.1016/j.scitotenv.2013.06.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [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: 12/31/2012] [Revised: 04/20/2013] [Accepted: 06/02/2013] [Indexed: 06/02/2023]
Abstract
Differences in the structure of diatom assemblages in headwaters with contrasting shading conditions and different land use in the buffer zone and upper catchment were studied in order to evaluate the influence of the lack of riparian vegetation on the biofilm. The objective was to ascertain whether a riparian buffer can mitigate the negative influence of human induced disturbance and pollution on diatom assemblages in headwaters. Four streams were selected in order to maximize the differences in the land cover and minimize other environmental gradients. Multivariate statistics, different comparative and permutation tests and correlations were applied to compare the diatom assemblages, the Specific Polluosensitivity Index (IPS) and the diatom ecological guilds (low profile, high profile and motile) among the sites studied and to evaluate their responses to disturbances. The analysis showed that low profile diatoms typically dominated in forested headwaters with limited resources, whilst assemblages at impacted sites showed a wider range of growth forms. In unimpacted streams, the diatom assemblages were influenced by temperature, pH, conductivity and calcium, as usually reported for oligotrophic streams with high natural disturbance due to fast current and shading. In both shaded and unshaded impacted streams, the importance of nutrients and land use disturbance, especially urbanization, prevailed. This trend was also reflected by the IPS index that showed consistently lower values at impacted sites, correlating most significantly with nutrients. The diatom species composition as well as diatom guilds at impacted sites were similar, regardless of the presence or absence of riparian vegetation, and were significantly influenced by seasonal changes. Our results indicate that diatoms react sensitively to alterations of the water environment in headwaters, induced by anthropogenic activities, and these impacts are not buffered by an intact riparian zone. Diatoms closely reflected land use practices in the upper catchment regardless of the buffer zone status.
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Affiliation(s)
- Daša Hlúbiková
- Public Research Centre-Gabriel Lippmann, Department of Environment and Agro-biotechnologies (EVA), 41 Rue du Brill, 4422 Belvaux, Luxembourg
| | - Maria Helena Novais
- Public Research Centre-Gabriel Lippmann, Department of Environment and Agro-biotechnologies (EVA), 41 Rue du Brill, 4422 Belvaux, Luxembourg
| | - Alain Dohet
- Public Research Centre-Gabriel Lippmann, Department of Environment and Agro-biotechnologies (EVA), 41 Rue du Brill, 4422 Belvaux, Luxembourg
| | - Lucien Hoffmann
- Public Research Centre-Gabriel Lippmann, Department of Environment and Agro-biotechnologies (EVA), 41 Rue du Brill, 4422 Belvaux, Luxembourg
| | - Luc Ector
- Public Research Centre-Gabriel Lippmann, Department of Environment and Agro-biotechnologies (EVA), 41 Rue du Brill, 4422 Belvaux, Luxembourg.
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Van de Vijver B, Ector L, Beltrami ME, de Haan M, Falasco E, Hlúbiková D, Jarlman A, Kelly M, Novais MH, Wojtal AZ. A critical analysis of the type material of Achnanthidium lineare W. Sm. (Bacillariophyceae). ACTA ACUST UNITED AC 2011. [DOI: 10.1127/1864-1318/2011/0136-0167] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Novais MH, Hlúbiková D, Morais M, Hoffmann L, Ector L. Morphology and ecology of Achnanthidium caravelense (Bacillariophyceae), a new species from Portuguese rivers. ACTA ACUST UNITED AC 2011. [DOI: 10.1127/1864-1318/2011/0136-0131] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Novais MH, Santos I, Mendes S, Pinto-Gomes C. Studies on pharmaceutical ethnobotany in Arrabida Natural Park (Portugal). J Ethnopharmacol 2004; 93:183-95. [PMID: 15234752 DOI: 10.1016/j.jep.2004.02.015] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2003] [Revised: 11/18/2003] [Accepted: 02/12/2004] [Indexed: 05/09/2023]
Abstract
An ethnobotanical survey was carried out in Arrabida Natural Park, a Portuguese Protected Area in the Southwest of the Iberian Peninsula, with an area of 10,820 ha. Working with 72 local people, data on medicinal uses of 156 taxa, belonging to 56 botanical families, were obtained and presented, of which 214 uses corresponding to 81 taxa were previously unreported.
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Affiliation(s)
- M H Novais
- Departamento de Ecologia da Universidade de Evora, Evora, Portugal
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