19 results on '"Laplace-Treyture C"'
Search Results
2. Strength and uncertainty of phytoplankton metrics for assessing eutrophication impacts in lakes
- Author
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Carvalho, L., Poikane, S., Lyche Solheim, A., Phillips, G., Borics, G., Catalan, J., De Hoyos, C., Drakare, S., Dudley, B. J., Järvinen, M., Laplace-Treyture, C., Maileht, K., McDonald, C., Mischke, U., Moe, J., Morabito, G., Nõges, P., Nõges, T., Ott, I., Pasztaleniec, A., Skjelbred, B., and Thackeray, S. J.
- Published
- 2013
- Full Text
- View/download PDF
3. Local distribution of macrophytes and consequences for sampling methods in large rivers
- Author
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Breugnot, E., Dutartre, A., Laplace-Treyture, C., and Haury, J.
- Published
- 2008
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- View/download PDF
4. Relationship between land-use in the agro-forestry system of les Landes, nitrogen loading to and risk of macro-algal blooming in the Bassin d'Arcachon coastal lagoon (SW France)
- Author
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De Wit, R., Leibreich, J., Vernier, F., Delmas, F., Beuffe, H., Maison, Ph., Chossat, J.-C., Laplace-Treyture, C., Laplana, R., Clavé, V., Torre, M., Auby, I., Trut, G., Maurer, D., and Capdeville, P.
- Published
- 2005
- Full Text
- View/download PDF
5. Sensitive biosensing of potentially toxic cyanobacteria for risk application in freshwater environments
- Author
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Herard, F., Sauvagère, S., El Anjoumi el Amrani, A., Guillebault, D., Laplace-Treyture, C., Moreira, S., Ortega Pizarro, A., Rodriguez Cristobal, J. M., Manes, C. L., MICROBIA ENVIRONNEMENT BANYULS FRA, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), CIMERA MADRID ESP, Ecosystèmes aquatiques et changements globaux (UR EABX), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), and IRSTEA BORDEAUX UR EABX FRA
- Subjects
TOXICITE ,toxicity ,BACTERIE ,GENETIQUE ,sensors ,BIOCAPTEUR GENETIQUE ,CYANOBACTERIE ,ARN ,monitoring ,SURVEILLANCE ,[SDE]Environmental Sciences ,GENRE TOXIQUE ,rna ,CAPTEUR ,bacteria ,pure lines - Abstract
International audience; Harmful cyanobacterial blooms are a major threat to freshwater ecosystems globally weighing down the Good Environmental Status of waters and risk for human health. Biosensors are a highly promising technology that can produce near real-time measurements that could be used by early warning systems safeguarding human and freshwater ecosystem health. We developed a rapid, sensitive, simple and economical test to identify and daily monitor the blooms of potentially toxic cyanobacteria in aquatic environments based on their genetic identity. This innovative solution comes in a colorimetric biosensor format to quickly and efficiently monitor and sustainably manage the contamination risks of potentially harmful cyanobacteria. The biosensor is a genus-specific ribosomal RNA/DNA probe-based assay of potentially toxic genus and is calibrated to equivalent cell numbers. Here we present the field validation tests results performed in a recreative bathing area in south Paris concerning the detection of Microcystis at different sampling points during summer 2017 campaign. The validation was performed by taxonomic cyanobacteria cell counting present in the samples.
- Published
- 2018
6. Benefits and limitations of an intercalibration of phytoplankton assessment methods based on the Mediterranean GIG reservoir experience
- Author
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Pahissa, José, Catalán, Jordi, Morabito, G., Dörflinger, Gerald, Ferreira, João, Laplace-Treyture, C., Gîrbea, Ruxandra, Marchetto, A., Polykarpou, Polina, de Hoyos, Caridad, Pahissa, José, Catalán, Jordi, Morabito, G., Dörflinger, Gerald, Ferreira, João, Laplace-Treyture, C., Gîrbea, Ruxandra, Marchetto, A., Polykarpou, Polina, and de Hoyos, Caridad
- Abstract
The status of European legislation regarding inland water quality after the enactment of the Water Framework Directive (WFD) originated scientific effort to develop reliable methods, primarily based on biological parameters. An important aspect of the process was to ensure that quality assessment was comparable between the different Member States. The Intercalibration process (IC), required in the WFD ensures the unbiased application of the norm. The presented results were developed in the context of the 2nd IC phase. An overview of the reservoir type definition of the Lake Mediterranean Geographical Intercalibration Group, where four types were considered divided by both alkalinity and climate, togetherwith the results for selection of MaximumEcological Potential sites (MEP) are presented. MEP reservoirs were selected based on pressure and biological variables. Three phytoplankton-based assessment methods were intercalibrated using data from Mediterranean countries. The Mediterranean Assessment System for Reservoirs Phytoplankton (Spain), the New Mediterranean Assessment System for Reservoirs Phytoplankton (Portugal and Cyprus) and the New Italian Method (Italy) were applied. These three methods were compared through option 3 of the Intercalibration Guide. The similarity of the assessments was quantified, and the Good/Moderate (GM) boundaries assessed. All three methods stood as comparable at the GM boundary except for theMASRP in siliceous wet reservoirs, which was slightly stricter. Finally, the main taxonomic groups represented in the phytoplankton community atMEP conditionswere identified, aswell as theirmain changes with an increasing trophic status.MEP sites are dominated by chrysophytes in siliceouswet reservoirs and by the diatoms Cyclotella and Achnanthes in calcareous ones. Cyanobacteria take over the community in both calcareous and siliceous wet reservoirs as eutrophication increases. In summary, the relevance and reliability of the quality assessment m
- Published
- 2015
7. ALISMA : outil de saisie, de bancarisation des données 'macrophytes' en cours d'eau et de calcul de l'IBMR
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Laplace-Treyture, C., Folliot, T., Loriot, S., Chauvin, C., IRSTEA BORDEAUX UR REBX FRA, and IUT INFORMATIQUE BORDEAUX FRA
- Subjects
ALISMA ,RIVERS ,BIOLOGICAL INDEX ,COURS D'EAU ,INDICE BIOLOGIQUE ,MACROPHYTE ,BASE DE DONNEES ,DATA BASE - Abstract
/ Les macrophytes, élément de qualité biologique (EQB) retenu par la Directive Cadre Européenne sur l'Eau (DCE) pour contribuer à l'évaluation de l'état écologique des masses d'eau, font l'objet de suivis dans les réseaux français selon le protocole normalisé de l'Indice Biologique Macrophytique en Rivière (IBMR - Norme AFNOR NF T90-395 ; octobre 2003). Le recueil de toutes les données générées annuellement par ces programmes de surveillance doit être assuré de façon standardisée, compatible avec les bases de données qui les centralisent, et permettant leur contrôle. L'évolution rapide des systèmes d'exploitation informatique a rendu obsolète ou non utilisables par tous les utilisateurs les modèles basés sur des applications MS.Excel, qui avaient été diffusés initialement pour la collecte harmonisée des données. Pour pallier ces inconvénients et rester compatible avec les nouveaux systèmes nationaux de bancarisation, un logiciel dédié a été développé sous un langage open source et utilisable sur l'ensemble des OS et versions logicielles couramment utilisés. Ses fonctionnalités reprennent celles des modèles informatiques précédents (saisie des résultats de relevés et calcul de bioindicateurs), et ajoute celles d'une base de données locale qui s'appuie sur des référentiels importés des systèmes nationaux (liste taxinomiques, listes de stations de mesure des réseaux de surveillance), permettant une bancarisation de toutes les données de l'opérateur, une exploitation de ces données et leur exportation.
- Published
- 2013
8. A new method to assess water trophy and organic pollution — the Macrophyte Biological Index for Rivers (IBMR): its application to different types of river and pollution
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Haury, J., primary, Peltre, M.-C., additional, Trémolières, M., additional, Barbe, J., additional, Thiébaut, G., additional, Bernez, I., additional, Daniel, H., additional, Chatenet, P., additional, Haan-Archipof, G., additional, Muller, S., additional, Dutartre, A., additional, Laplace-Treyture, C., additional, Cazaubon, A., additional, and Lambert-Servien, E., additional
- Full Text
- View/download PDF
9. Strength and uncertainty of phytoplankton metrics for assessing eutrophication impacts in lakes
- Author
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Carvalho, L., Poikane, S., Lyche Solheim, A., Phillips, G., Borics, G., Catalán, Jordi, de Hoyos, Caridad, Drakare, S., Dudley, B. J., Järvinen, M., Laplace-Treyture, C., Maileht, K., McDonald, C., Mischke, U., Moe, J., Morabito, G., Nõges, Peeter, Noges, T., Ott, I., Pasztaleniec, A., Skjelbred, B., Thackeray, S. J., Carvalho, L., Poikane, S., Lyche Solheim, A., Phillips, G., Borics, G., Catalán, Jordi, de Hoyos, Caridad, Drakare, S., Dudley, B. J., Järvinen, M., Laplace-Treyture, C., Maileht, K., McDonald, C., Mischke, U., Moe, J., Morabito, G., Nõges, Peeter, Noges, T., Ott, I., Pasztaleniec, A., Skjelbred, B., and Thackeray, S. J.
- Abstract
Phytoplankton constitutes a diverse array of short-lived organisms which derive their nutrients from the water column of lakes. These features make this community the most direct and earliest indicator of the impacts of changing nutrient conditions on lake ecosystems. It also makes them particularly suitable for measuring the success of restoration measures following reductions in nutrient loads. This paper integrates a large volume of work on a number of measures, or metrics, developed for using phytoplankton to assess the ecological status of European lakes, as required for the Water Framework Directive. It assesses the indicator strength of these metrics, specifically in relation to representing the impacts of eutrophication. It also examines how these measures vary naturally at different locations within a lake, as well as between lakes, and how much variability is associated with different replicate samples, different months within a year and between years. On the basis of this analysis, three of the strongest metrics (chlorophyll-a, phytoplankton trophic index (PTI), and cyanobacterial biovolume) are recommended for use as robust measures for assessing the ecological quality of lakes in relation to nutrient-enrichment pressures and a minimum recommended sampling frequency is provided for these three metrics.
- Published
- 2012
10. Strength and uncertainty of phytoplankton metrics for assessing eutrophication impacts in lakes
- Author
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Carvalho, L., primary, Poikane, S., additional, Lyche Solheim, A., additional, Phillips, G., additional, Borics, G., additional, Catalan, J., additional, De Hoyos, C., additional, Drakare, S., additional, Dudley, B. J., additional, Järvinen, M., additional, Laplace-Treyture, C., additional, Maileht, K., additional, McDonald, C., additional, Mischke, U., additional, Moe, J., additional, Morabito, G., additional, Nõges, P., additional, Nõges, T., additional, Ott, I., additional, Pasztaleniec, A., additional, Skjelbred, B., additional, and Thackeray, S. J., additional
- Published
- 2012
- Full Text
- View/download PDF
11. Relationship between land-use in the agro-forestry system of les Landes, nitrogen loading to and risk of macro-algal blooming in the Bassin d'Arcachon coastal lagoon (SW France)
- Author
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De Wit, Rutger, Leibreich, J, Vernier, F, Delmas, F, Beuffe, H, Maison, P, Chossat, J, Laplace Treyture, C, Laplana, R, Clave, V, Torre, M, Auby, Isabelle, Trut, Gilles, Maurer, Daniele, Capdeville, P, De Wit, Rutger, Leibreich, J, Vernier, F, Delmas, F, Beuffe, H, Maison, P, Chossat, J, Laplace Treyture, C, Laplana, R, Clave, V, Torre, M, Auby, Isabelle, Trut, Gilles, Maurer, Daniele, and Capdeville, P
- Abstract
Nitrogen loading to the Bassin d'Arcachon coastal lagoon (SW France) was evaluated by studying land-use and nitrogen output in its 3001 km(2) catchment. At present, the catchment is dominated by forestry (79%), while intensive agriculture occupies 9% of the surface. The N-output of two hydrological subunits, i.e. the Tagon subunit dominated by pine forestry and the Arriou 11 subunit comprising both forestry and intensive agriculture, were monitored for a seven year period (1996-2002). From these observations it was calculated that forestry contributes on average 1.6 kg total N ha(-1) yr(-1), which is dominated by organic nitrogen (DON+PON are 70% of N). On an areal basis, intensive agriculture contributes 26 times more than forestry, i.e. 41.6 kg total N ha(-1) yr(-1), which is mainly in the form of nitrate (65% of N). These data were upscaled to the catchment and the upscaling was validated by comparison to gauged nitrogen throughputs for the catchment of the Leyre river that is the major tributary to the system. Taking into account the other known N sources and the interannual variability in the catchment it was estimated that nitrogen loading to the lagoon was on average 90 kg ha(-1) yr(-1) (range from 54 to 126 kg ha(-1) yr(-1)). The sandy soils of the catchment have a clear potential for denitrification, but anoxic conditions (waterlogged) and input of organic matter to fuel this process are required. Currently, agricultural practices and spatial planning do not make use of this potential. Nitrogen loading in the Bassin d'Arcachon is reflected by 10-40 muM nitrate concentrations in winter, which became depleted during spring as a result of uptake by vegetation. Short-term uptake experiments showed that the macroalga Monostroma obscurum is well adapted to temperatures between 10 to 20degreesC and competitive with respect to the seagrass Zostera noltii when the nitrate concentrations are above 10 muM. Spring conditions with high nitrate and high insolation are th
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- 2005
- Full Text
- View/download PDF
12. A new method to assess water trophy and organic pollution – the Macrophyte Biological Index for Rivers (IBMR): its application to different types of river and pollution
- Author
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Haury, J., primary, Peltre, M. -C., additional, Trémolières, M., additional, Barbe, J., additional, Thiébaut, G., additional, Bernez, I., additional, Daniel, H., additional, Chatenet, P., additional, Haan-Archipof, G., additional, Muller, S., additional, Dutartre, A., additional, Laplace-Treyture, C., additional, Cazaubon, A., additional, and Lambert-Servien, E., additional
- Published
- 2006
- Full Text
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13. Un système opérationnel de surveillance et d'alerte des proliférations de cyanobactéries : application aux plans d'eau landais
- Author
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LAPLACE-TREYTURE, C., MOREIRA, S., GOGIN, S., PICKHAHN, L., EON, M., and JAMONEAU, A.
- Subjects
LANDES ,POLLUTION ,13. Climate action ,CYANOBACTÉRIES ,PLAN D'EAU ,SURVEILLANCE BIOLOGIQUE ,6. Clean water
14. Response of phytoplankton traits to environmental variables in French lakes: New perspectives for bioindication.
- Author
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Derot, J., Jamoneau, A., Teichert, N., Rosebery, J., Morin, S., and Laplace-Treyture, C.
- Subjects
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PHYTOPLANKTON , *FRESHWATER phytoplankton , *DISSOLVED organic matter , *LAKES , *WATER quality , *MODERN society - Abstract
• Response of phytoplankton traits to environment was investigated in French lakes. • 21 traits were selected out of the 84 initially present in our database. • Some interesting phytoplankton traits were related to nitrate concentrations. • The response of phytoplanktonic traits was consistent across lake typologies. • Identified traits could be used in future bioassessment programs. The restoration and the preservation of aquatics ecosystems is a critical issue in our contemporary society. In lake ecosystems, phytoplankton taxonomic-based indicators have been developed to evaluate water quality, but suffer of limited ecosystem ecological value. The recent development of functional approaches may allow to evaluate other aspects of ecosystem quality, and to develop new trait-based indicators responding to different environmental conditions. Here, our aim was to analyze the response of phytoplankton traits to numerous environmental variables and to identify relevant traits for the development of future indicator metrics. We used a French national database of 469 lakes, consisting in phytoplankton biovolumes and physicochemical values. The response of 84 morpho-functional traits towards environmental variables was tested with Machine Learning models, taking into account lake typology. We identified 21 traits significantly related to environmental variables. Dissolved Organic Carbon, Nitrates and Total Suspend Solids were the physiochemical parameters which had the higher influence on our traits selection. However the response of phytoplanktonic traits to environmental variables did not change according to lake typology, advocating for a consistent response at the whole national scale contrary to the classical taxonomic approach. We finally identified several candidate traits that could be used for the development of new metrics for French lakes in a context of bio-assessment programs. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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15. Assessing the relevance of DNA metabarcoding compared to morphological identification for lake phytoplankton monitoring.
- Author
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Nicolosi Gelis MM, Canino A, Bouchez A, Domaizon I, Laplace-Treyture C, Rimet F, and Alric B
- Subjects
- Lakes, DNA Barcoding, Taxonomic, Genetic Markers, DNA, Phytoplankton genetics, Diatoms genetics
- Abstract
Phytoplankton is a key biological group used to assess the ecological status of lakes. The classical monitoring approach relies on microscopic identification and counting of phytoplankton species, which is time-consuming and requires high taxonomic expertise. High-throughput sequencing, combined with metabarcoding, has recently demonstrated its potential as an alternative approach for plankton surveys. Several studies have confirmed the relevance of the diatom metabarcoding approach to calculate biotic indices based on species ecology. However, phytoplankton communities have not yet benefited from such validation. Here, by comparing the results obtained with the two methods (molecular and microscopic counting), we evaluated the relevance of metabarcoding approach for phytoplankton monitoring by considering different metrics: alpha diversity, taxonomic composition, community structure and a phytoplankton biotic index used to assess the trophic level of lakes. For this purpose, 55 samples were collected in four large alpine lakes (Aiguebelette, Annecy, Bourget, Geneva) during the year 2021. For each sample, a metabarcoding analysis based on two genetic markers (16S and 23S rRNA) was performed, in addition to the microscopic count. Regarding the trophic level of lakes, significant differences were found between index values obtained with the two approaches. The main hypothesis to explain these differences comes from the incompleteness, particularly at the species level, of the barcode reference library for the two genetic markers. It is therefore necessary to complete reference libraries for using such species-based biotic indices with metabarcoding data. Besides this, species richness and diversity were higher in the molecular inventories than in the microscopic ones. Moreover, despite differences in taxonomic composition of the floristic lists obtained by the two approaches, their community structures were similar. These results support the possibility of using metabarcoding for phytoplankton monitoring but in a different way. We suggest exploring alternative approaches to index development, such as a taxonomy-free approach., Competing Interests: Declaration of competing interest The achievement of this manuscript has not been influenced by competing financial, personal, or professional interests., (Copyright © 2024 Elsevier B.V. All rights reserved.)
- Published
- 2024
- Full Text
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16. Measuring biodiversity vulnerability in French lakes - The IVCLA index.
- Author
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Silva Rocha B, Jamoneau A, Logez M, Laplace-Treyture C, Reynaud N, and Argillier C
- Subjects
- Animals, Humans, Biodiversity, Ecology, Water Quality, Fishes, Phytoplankton, Ecosystem, Lakes
- Abstract
Assessing the vulnerability of ecosystems to biodiversity loss has become increasingly crucial in conservation and ecology research. This study proposed a methodology for measuring lake vulnerability to biodiversity loss employing an established framework that combines three components. For this, we measured the resilience (functional redundancy) and sensitivity (an index considering three characteristics of rarity) components for fish and phytoplankton communities. We also measured the exposure component of the main stressors in lakes. We then combined the three components and calculated the vulnerability index (IVCLA) using data from 255 French lakes. We found that all lakes exhibited low levels of resilience, elevated sensitivity regarding average values for fish and phytoplankton groups, and medium exposure to stressors associated with human activities. In addition, there were some discrepancies in resilience and sensitivity patterns between fish and phytoplankton groups, emphasizing the importance of considering information from multiple biological groups when assessing ecosystem vulnerability. Hydrological alterations and low water quality were key stressors related to higher lake vulnerability. Most French lakes have been classified as exhibiting moderate vulnerability. It is crucial to emphasize the potential increase in exposure risks, which could lead to even higher vulnerability levels and, subsequently, biodiversity loss in the future. The IVCLA index offers several advantages, including integrating multiple taxa groups and stressors. We recommend incorporating additional data, such as the resilience and sensitivity of the entire food web, and considering temporal responses to stressors to improve accuracy and predictive power. The IVCLA was developed with the purpose of serving as an effective tool for guiding environmental managers in designing conservation strategies and making informed decisions for lake ecosystems., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023 Elsevier B.V. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
17. Phytoplankton morpho-functional trait dataset from French water-bodies.
- Author
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Laplace-Treyture C, Derot J, Prévost E, Le Mat A, and Jamoneau A
- Subjects
- France, Phenotype, Ecosystem, Environmental Monitoring, Lakes, Phytoplankton growth & development
- Abstract
In lake ecosystems, phytoplankton communities can be studied by adopting taxonomic-based approaches. However, these approaches suffer from identification issues and are sometimes of limited ecosystem ecological value. The recent development of functional approaches may allow an evaluation of other aspects of ecosystem quality, functions and interactions with abiotic parameters or other communities. Here, our aim was to create a phytoplankton trait database at the French scale. This database will be relevant for the analysis of phytoplankton communities that will lead to a better understanding of phytoplankton functional ecology in lakes of France and other European countries possessing similar biological communities. We used a French national database of phytoplankton occurrences sampled from 384 lakes over the entire French metropolitan territory. A final list of 636 taxa was used to compile 53 morpho-functional traits associated with taxonomic information. The traits encompassed variables such as shape, biovolume, motility, toxin production and Reynolds groups. With this new database, we aim to provide data for morpho-functional analyses of phytoplankton assemblages from local to European scale.
- Published
- 2021
- Full Text
- View/download PDF
18. Benefits and limitations of an intercalibration of phytoplankton assessment methods based on the Mediterranean GIG reservoir experience.
- Author
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Pahissa J, Catalan J, Morabito G, Dörflinger G, Ferreira J, Laplace-Treyture C, Gîrbea R, Marchetto A, Polykarpou P, and de Hoyos C
- Subjects
- Eutrophication, Lakes, Mediterranean Region, Reproducibility of Results, Water Pollution analysis, Environmental Monitoring methods, Phytoplankton growth & development, Water Pollution statistics & numerical data
- Abstract
The status of European legislation regarding inland water quality after the enactment of the Water Framework Directive (WFD) originated scientific effort to develop reliable methods, primarily based on biological parameters. An important aspect of the process was to ensure that quality assessment was comparable between the different Member States. The Intercalibration process (IC), required in the WFD ensures the unbiased application of the norm. The presented results were developed in the context of the 2nd IC phase. An overview of the reservoir type definition of the Lake Mediterranean Geographical Intercalibration Group, where four types were considered divided by both alkalinity and climate, together with the results for selection of Maximum Ecological Potential sites (MEP) are presented. MEP reservoirs were selected based on pressure and biological variables. Three phytoplankton-based assessment methods were intercalibrated using data from Mediterranean countries. The Mediterranean Assessment System for Reservoirs Phytoplankton (Spain), the New Mediterranean Assessment System for Reservoirs Phytoplankton (Portugal and Cyprus) and the New Italian Method (Italy) were applied. These three methods were compared through option 3 of the Intercalibration Guide. The similarity of the assessments was quantified, and the Good/Moderate (GM) boundaries assessed. All three methods stood as comparable at the GM boundary except for the MASRP in siliceous wet reservoirs, which was slightly stricter. Finally, the main taxonomic groups represented in the phytoplankton community at MEP conditions were identified, as well as their main changes with an increasing trophic status. MEP sites are dominated by chrysophytes in siliceous wet reservoirs and by the diatoms Cyclotella and Achnanthes in calcareous ones. Cyanobacteria take over the community in both calcareous and siliceous wet reservoirs as eutrophication increases. In summary, the relevance and reliability of the quality assessment methods compared were confirmed both from an ecological perspective and a health risk management point of view., (Copyright © 2015 Elsevier B.V. All rights reserved.)
- Published
- 2015
- Full Text
- View/download PDF
19. Defining chlorophyll-a reference conditions in European lakes.
- Author
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Poikāne S, Alves MH, Argillier C, van den Berg M, Buzzi F, Hoehn E, de Hoyos C, Karottki I, Laplace-Treyture C, Solheim AL, Ortiz-Casas J, Ott I, Phillips G, Pilke A, Pádua J, Remec-Rekar S, Riedmüller U, Schaumburg J, Serrano ML, Soszka H, Tierney D, Urbanic G, and Wolfram G
- Subjects
- Environmental Monitoring methods, Europe, Eutrophication, Phytoplankton, Reference Values, Chlorophyll, Fresh Water
- Abstract
The concept of "reference conditions" describes the benchmark against which current conditions are compared when assessing the status of water bodies. In this paper we focus on the establishment of reference conditions for European lakes according to a phytoplankton biomass indicator--the concentration of chlorophyll-a. A mostly spatial approach (selection of existing lakes with no or minor human impact) was used to set the reference conditions for chlorophyll-a values, supplemented by historical data, paleolimnological investigations and modelling. The work resulted in definition of reference conditions and the boundary between "high" and "good" status for 15 main lake types and five ecoregions of Europe: Alpine, Atlantic, Central/Baltic, Mediterranean, and Northern. Additionally, empirical models were developed for estimating site-specific reference chlorophyll-a concentrations from a set of potential predictor variables. The results were recently formulated into the EU legislation, marking the first attempt in international water policy to move from chemical quality standards to ecological quality targets.
- Published
- 2010
- Full Text
- View/download PDF
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