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Provedor de dados:  5
País:  France
Título:  A Bayesian framework to objectively combine metrics when developing stressor specific multimetric indicator
Autores:  Drouineau, Hilaire
Lobry, Jeremy
Delpech, C.
Bouchoucha, Marc
Mahevas, Stephanie
Courrat, A.
Pasquaud, S.
Lepage, M.
Data:  2012-02
Ano:  2012
Palavras-chave:  Multimetric fish-based indicator
Bayesian method
Pressure-impact models
Water Framework Directive
Anthropogenic pressure
Monitoring program
Transitional waters
Resumo:  In the context of the European Water Framework Directive (WFD), monitoring programs and related indicators have been developed to assess anthropogenic impacts on various components of aquatic ecosystems. While great precautions are usually taken when selecting and calculating relevant core metrics, little attention is generally paid to the generation of the multimetric indicator, i.e. the combination of the different core metrics. Indeed, most multimetric indicators are generated by simply averaging or summing metrics, without taking into account their sensitivity and their variability. Moreover, few indicators provide a rigorous estimate of the uncertainty of the assessments, while this estimation is essential for managers. In this context, we developed a Bayesian framework to build multimetric indicators aiming at improving those two weaknesses. This framework is based on two phases. First, pressure-impact statistical models are developed to quantify the impact of pressure on various fish metrics. Then the Bayesian theorem is applied to estimate probabilities of being at a certain anthropogenic pressure level from fish observation and pressure-impact models outputs. The Bayesian theorem allows to combine objectively the different core metrics, taking into account their sensitivity and their variability, and to provide rigorous uncertainty quantification, which is especially valuable in the WFD context. The method is applied as illustrative example on transitional French water bodies to demonstrate its relevance, especially in the Water Framework Directive context though the method is generic enough to be applied in various contexts. (C) 2011 Elsevier Ltd. All rights reserved.
Tipo:  Text
Idioma:  Inglês

Editor:  Elsevier Science Bv
Formato:  application/pdf
Fonte:  Ecological Indicators (1470-160X) (Elsevier Science Bv), 2012-02 , Vol. 13 , N. 1 , P. 314-321
Direitos:  2011 Elsevier Ltd. All rights reserved.

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