The Estuarine Quality Paradox: is it ...
Type de document :
Compte-rendu et recension critique d'ouvrage
Titre :
The Estuarine Quality Paradox: is it possible to define an Ecological Quality Status for specific modified and naturally stressed estuarine ecosystems?
Auteur(s) :
Dauvin, Jean-Claude [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Ruellet, Thierry [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Ruellet, Thierry [Auteur]
Titre de la revue :
Marine Pollution Bulletin
Pagination :
38-47
Éditeur :
Elsevier
Date de publication :
2009
ISSN :
0025-326X
Discipline(s) HAL :
Planète et Univers [physics]/Sciences de la Terre/Océanographie
Résumé en anglais : [en]
The implementation of the European Water Framework Directive has provoked enthusiastic debate between scientists and stakeholders, as they try to define the ecological quality status (EcoQS) of all water bodies, including ...
Lire la suite >The implementation of the European Water Framework Directive has provoked enthusiastic debate between scientists and stakeholders, as they try to define the ecological quality status (EcoQS) of all water bodies, including estuaries (i.e., transitional waters). The issue is complex because estuarine environments are variable, due to fresh and marine water input and anthropogenic impacts. Benthic species and communities have adapted to tolerate temporal physico-chemical changes (e.g., salinity, substrata, depth, fine particles and a Maximum Turbidity Zone that is rich in organic matter). However, anthropogenization affects not only the water quality, but also estuarine surface size and navigation channel management. Though numerous bio-indicators and indices are used to define estuarine system EcoQS, very few of them were developed specifically for such variable anthropogenized systems comprising a variety of conditions. The critical question is: 'Is it possible to define an EcoQS for such specific modified and naturally stressed ecosystems?' Indicators must be chosen pragmatically so that they will be environmentally sustainable, economically viable, technologically feasible, socially desirable/tolerable, legally permissible and politically expedient. This contribution proposes an adaptation of the BOPA index, the Benthic Opportunistic Annelida Amphipod index (BO2 A), for use in the freshwater zones of transitional waters (i.e., up to the upper limit of tidal range). Several possibilities are discussed in light of the diverse disturbances and the heterogeneity of such stressed zones.Lire moins >
Lire la suite >The implementation of the European Water Framework Directive has provoked enthusiastic debate between scientists and stakeholders, as they try to define the ecological quality status (EcoQS) of all water bodies, including estuaries (i.e., transitional waters). The issue is complex because estuarine environments are variable, due to fresh and marine water input and anthropogenic impacts. Benthic species and communities have adapted to tolerate temporal physico-chemical changes (e.g., salinity, substrata, depth, fine particles and a Maximum Turbidity Zone that is rich in organic matter). However, anthropogenization affects not only the water quality, but also estuarine surface size and navigation channel management. Though numerous bio-indicators and indices are used to define estuarine system EcoQS, very few of them were developed specifically for such variable anthropogenized systems comprising a variety of conditions. The critical question is: 'Is it possible to define an EcoQS for such specific modified and naturally stressed ecosystems?' Indicators must be chosen pragmatically so that they will be environmentally sustainable, economically viable, technologically feasible, socially desirable/tolerable, legally permissible and politically expedient. This contribution proposes an adaptation of the BOPA index, the Benthic Opportunistic Annelida Amphipod index (BO2 A), for use in the freshwater zones of transitional waters (i.e., up to the upper limit of tidal range). Several possibilities are discussed in light of the diverse disturbances and the heterogeneity of such stressed zones.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Source :
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