Paradox of estuarine quality: benthic indicators and indices, consensus or debate for the future.

The European Water Framework Directive will have instituted the concept of Ecological Quality Status (EQS) as a way to assess the biological quality of water masses. The EQS will be based mainly upon the composition of the different biological compartments in the ecosystem specially the benthos as compared to certain reference sites. Such management tools are already well established for freshwater (i.e. biotic indices), but not for coastal and estuarine (i.e. transitional) waters. In the framework of the Seine-Aval programme a workshop on benthic indicators was organized at Wimereux (France) in June 2005. The aim of this workshop and this paper is (1) to present the experiences of the Seine Aval researchers, and the French scientific approaches to benthic indicators, with those international experiences and approaches that have been published or are under development; and (2) to examine the existing benthic tools and their possible use in the characterization of the state of estuarine ecosystems. The debate during the workshop and the numerous recently published on the WFD are discussed in term of the implementation of the WFD in transitional water bodies using benthic indicators and indices. Some proposals for the future underline the needs to re-examine and adapt the different index thresholds, to take into account physical disturbances, to inventory the existing conditions vs reference conditions and to be as pragmatic as possible in using the WFD in transitional waters.

[1]  N. Simboura Bentix Index vs. Biotic index in monitoring: an answer to Borja et al., 2003. , 2004, Marine pollution bulletin.

[2]  J. Dauvin,et al.  The ecological quality status of the Bay of Seine and the Seine estuary: use of biotic indices. , 2007, Marine pollution bulletin.

[3]  Michael Elliott,et al.  Biological pollutants and biological pollution--an increasing cause for concern. , 2003, Marine pollution bulletin.

[4]  J. Dauvin Effects of heavy metal contamination on the macrobenthic fauna in estuaries: the case of the Seine estuary. , 2008, Marine pollution bulletin.

[5]  R. Valente,et al.  A review of approaches for classifying benthic habitats and evaluating habitat quality. , 2004, Journal of environmental management.

[6]  D. Dauer,et al.  An estuarine benthic index of biotic integrity for the Mid-Atlantic region of the United States. II. Index development , 2002 .

[7]  Jean-Claude Dauvin,et al.  Expertise in coastal zone environmental impact assessments. , 2005, Marine pollution bulletin.

[8]  M. Tsapakis,et al.  INDICATORS OF STRESS IN THE MARINE BENTHOS , 2004 .

[9]  Spatial scales and probability based sampling in determining levels of benthic community degradation in the Chesapeake Bay. , 2003, Environmental monitoring and assessment.

[10]  P. Goethals,et al.  Implications of taxonomic modifications and alien species on biological water quality assessment as exemplified by the Belgian Biotic Index method , 2005 .

[11]  Y. Hénocque,et al.  The French approach to managing water resources in the Mediterranean and the new European Water Framework Directive. , 2003, Marine pollution bulletin.

[12]  I. Muxika,et al.  Long-term recovery of soft-bottom benthos following urban and industrial sewage treatment in the Nervión estuary (southern Bay of Biscay) , 2006 .

[13]  M. Elliott,et al.  Data use and information creation: challenges for marine scientists and for managers. , 2003, Marine pollution bulletin.

[14]  Á. Borja,et al.  Implementing the European Water Framework Directive: the debate continues... , 2005, Marine pollution bulletin.

[15]  S. Fraschetti,et al.  Taxonomic sufficiency and the increasing insufficiency of taxonomic expertise. , 2003, Marine pollution bulletin.

[16]  Ibon Galparsoro,et al.  The European Water Framework Directive and the DPSIR, a methodological approach to assess the risk of failing to achieve good ecological status , 2006 .

[17]  Michael Elliott,et al.  The derivation, performance and role of univariate and multivariate indicators of benthic change : Case studies at differing spatial scales , 2006 .

[18]  Michael Elliott,et al.  Integrated marine management and administration for an island state-the case for a new Marine Agency for the UK. , 2006, Marine pollution bulletin.

[19]  Michael Elliott,et al.  The Estuarine Ecosystem: Ecology, Threats, and Management , 2004 .

[20]  Angel Borja,et al.  Guidelines for the use of AMBI (AZTI's Marine Biotic Index) in the assessment of the benthic ecological quality. , 2005, Marine pollution bulletin.

[21]  Ángel Borja,et al.  The European water framework directive: A challenge for nearshore, coastal and continental shelf research , 2005 .

[22]  Stephen B. Weisberg,et al.  Relationships between benthic community condition, water quality, sediment quality, nutrient loads, and land use patterns in Chesapeake Bay , 2000 .

[23]  S I Rogers,et al.  A UK perspective on the development of marine ecosystem indicators. , 2005, Marine pollution bulletin.

[24]  J. Dauvin,et al.  Polychaete/amphipod ratio revisited. , 2007, Marine pollution bulletin.

[25]  R. Rosenberg,et al.  Characterization of the ecological quality of the coastal Gulf of Lions (NW Mediterranean). A comparative approach based on three biotic indices. , 2006, Marine pollution bulletin.

[26]  Josette Garnier,et al.  Modeling the response of water quality in the Seine River estuary to human activity in its watershed over the last 50 years , 2001 .

[27]  Á. Borja The biotic indices and the Water Framework Directive: the required consensus in the new benthic monitoring tools , 2004 .

[28]  M. Elliott,et al.  The use of environmental integrative indicators to assess seabed disturbance in estuaries and coasts: Application to the Humber Estuary, UK. , 2006, Marine pollution bulletin.

[29]  R. Lafite,et al.  A man-altered macrotidal estuary: The Seine estuary (France): Introduction to the special issue , 2001 .

[30]  Jean-Claude Dauvin,et al.  Amphipods are good bioindicators of the impact of oil spills on soft-bottom macrobenthic communities , 2000 .

[31]  I. Muxikaa,et al.  The suitability of the marine biotic index ( AMBI ) to new impact sources along European coasts , 2005 .

[32]  B. Elkaim,et al.  An analysis of the trophic network of a macrotidal estuary: the Seine Estuary (Eastern Channel, Normandy, France) , 2003 .

[33]  C. Rakocinski,et al.  Macrobenthic Process-Indicators of Estuarine Condition , 2004 .

[34]  Juan Bald,et al.  Implementation of the European water framework directive from the Basque country (northern Spain): a methodological approach. , 2004, Marine pollution bulletin.

[35]  C. Frid,et al.  Using indicator species to assess the state of macrobenthic communities , 2003, Hydrobiologia.

[36]  N. Simboura,et al.  A synthesis of the biological quality elements for the implementation of the European Water Framework Directive in the Mediterranean ecoregion: The case of Saronikos Gulf , 2005 .

[37]  J. Marquesa,et al.  Evaluation of the applicability of a marine biotic index to characterize the status of estuarine ecosystems: the case of Mondego estuary (Portugal) , 2004 .

[38]  D. Dauer,et al.  An estuarine benthic index of biotic integrity for the Mid-Atlantic region of the United States. I. Classification of assemblages and habitat definition , 2002 .

[39]  P. Servais,et al.  Lower Seine River and estuary (France) carbon and oxygen budgets during low flow , 2001 .

[40]  A. Zenetos,et al.  Benthic indicators to use in Ecological Quality classification of Mediterranean soft bottom marine ecosystems, including a new Biotic Index , 2002 .

[41]  J. Dauvin,et al.  Taxonomic sufficiency: an overview of its use in the monitoring of sublittoral benthic communities after oil spills. , 2003, Marine pollution bulletin.

[42]  B. Sautour,et al.  Long-term changes of the zooplankton variability in a turbid environment: The Gironde estuary (France) , 2005 .

[43]  M. Elliott,et al.  Marine monitoring: Its shortcomings and mismatch with the EU Water Framework Directive's objectives. , 2006, Marine pollution bulletin.

[44]  Michael Elliott,et al.  The role of the DPSIR approach and conceptual models in marine environmental management: an example for offshore wind power. , 2002, Marine pollution bulletin.

[45]  Mats Blomqvist,et al.  Marine quality assessment by use of benthic species-abundance distributions: a proposed new protocol within the European Union Water Framework Directive. , 2004, Marine pollution bulletin.

[46]  P Goovaerts,et al.  Benthic biotope index for classifying habitats in the Sado Estuary: Portugal. , 2005, Marine environmental research.

[47]  R. Rosenberg,et al.  Macrobenthic succession in relation to organic enrichment and pollution of the marine environment , 1978 .

[48]  M. Elliott,et al.  The Need for Definitions in Understanding Estuaries , 2002 .

[49]  Ángel Borja,et al.  A Marine Biotic Index to Establish the Ecological Quality of Soft-Bottom Benthos Within European Estuarine and Coastal Environments , 2000 .

[50]  S. Weisberg,et al.  An estuarine benthic index of biotic integrity (B-IBI) for Chesapeake Bay , 1997 .

[51]  M. Elliott The derivation and value of ecological quality standards and objectives , 1996 .

[52]  Augusto Cesar,et al.  Establishing the ecological quality status of soft-bottom mining-impacted coastal water bodies in the scope of the Water Framework Directive. , 2005, Marine pollution bulletin.

[53]  J. Dauvin,et al.  The food web in the lower part of the Seine estuary: a synthesis of existing knowledge , 2005, Hydrobiologia.

[54]  M. Elliott The analysis of macrobenthic community data , 1994 .

[55]  M. Glemarec,et al.  Using biotic indices to estimate macrobenthic community perturbations in the Bay of Brest , 1997 .

[56]  I. Muxika,et al.  The application of a Marine Biotic Index to different impact sources affecting soft-bottom benthic communities along European coasts. , 2003, Marine pollution bulletin.

[57]  K. A. Bekiashev,et al.  Intergovernmental Oceanographic Commission (IOC) , 1981 .