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This international &#160;symposium will focus on :&#160;Estuarine and Lagoon &#160;Ecosystem Trajectories.Throughout the world, estuaries and lagoons are among the most intensely modified and threatened aquatic ecosystems. Moreover, these systems are vulnerable to the consequences of global change.&#160;&#160;From a management point of view, there is a tremendous and concrete lack of knowledge regarding the functioning of estuarine ecosystems and the socio-economic relations that bind the various actors to these environments.In that context, suitable management, governance &#160;and restoration approaches should address both ecological and societal &#160;aspects. Medium and long term investigations seem to be suitable to draw &#160;the ecosystem trajectories and to explore in an useful way their prospective &#160;evolution under different scenarios. This leads to a situation where we &#160;may question the concept of &#171; Good Ecological Status/ GES &#187; &#160;and &#171; Good Ecological Potential/ GEP &#187;. As estuaries and lagoons &#160;are irreversibly affected by human activity, the good ecological status &#160;becomes mainly a societal choice, asking the question &#171; Which nature &#160;do we want for tomorrow ? &#187;Apart from tools, models and &#160;methodologies to assess ecosystem trajectories, example of management &#160;for preservation, restoration and compensation measures as well as governance issues are welcome.This ECSA symposium will contribute &#160;to provide sound science on past and future estuarine and lagoon ecosystem &#160;evolution. A special session will be dedicated to the concept of good &#160;ecological status (GES) in the context of the Water Framework Directive.&#160;Topics1- Preservation, Rehabilitation and Restoration of ecosystemsThis first session is concerned with studies and realizations aiming to preserve estuarine and/or lagoons ecosystems ecological functions. Research/experimentations engaged to restore parts of lost functionalities due to high human pressures, through different ways as restoration, renaturalization, rehabilitation, compensation, etc. are also encouraged. Example of habitat restoration and measures taken in order to preserve estuarine/lagoon ecosystems are welcome. Socioeconomics as well as political point of view related to goods and services provided by estuaries and lagoons and/or through or by preservation/restoration actions will be discussed.    How to increase/preserve main estuarine/lagoon functionalities (ecological and socioeconomical)?     How to assess or manage rehabilitation actions ?     Which functionalities are to be first restored to improve ecological functioning and how to choose them ? Key words : Depolderization, land claiming, reversibility, marshes2- What is &#171; Good ecological status &#187; and &#171; Good ecological potential &#187;?The second session is dedicated to a now largely used notion of &#8220;good ecological status&#8221;. Besides its restrictive meaning given by the European Water Framework Directive or other governmental policies, the questions arising about how to define such a status will be highlighted. Multicriteria approaches to good ecological status and potential are concerned.Special session is planned about results from the research project BEEST (Bon Etat &#233;cologique des grands ESTuaires Seine, Loire, Gironde France) which has focused on these topics from the 3 largest French estuaries experiences also in their societal aspects.As estuaries and lagoons are irreversibly affected by human activities, the good ecological status becomes mainly a societal choice, asking the question &#171; Which nature do we want for tomorrow in a context of increasing requests of recreational activities ?&#8221;    How to estimate/calculate ecological status based on which reference conditions ?     How to cope with inexistent natural reference conditions for large estuaries and lagoons ?     How is considered/perceived a good ecological status by the different society actors/stakeholders ? Key words : Indicators, metrics, reference conditions, WFD, social cost, public policies, ecosystem resilience, anthroposystem, environmental management, temporal spatial scales, tourism, fishing, human activities, landscape3- Methods, Tools and Models for ecosystem monitoring and evolution analysisIn the third session, methodology will be presented and discussed. All tools, methods used/tested or under development for a better understanding of estuarine/lagoons ecosystems functioning are of interest. Modelling is of special interest not only for ecological functioning but also to integrate larger fields like management and societal aspects and to deal with evolutions at different scales. Confrontation of structural indicators and functional indicators is suitable to highlight their contribution to long-term ecosystem monitoring.    How natural/societal processes running these systems can be depicted?     How models can help to better understanding of these ecosystems and give guidance tools for managers?     Which tools are the most appropriate to assess systems trajectories? Key words : GIS, trophic chains, network analysis, resilience, sampling, recording systems, non stationary states, ECOPATH, ECOSIM, regime shift4 - Ecosystem trajectories, prospective scenarios and adaptationThe forth session will focus on estuarine/lagoon ecosystem trajectories. Presentations about evolutions of such ecosystems using any functioning indicators or other tools are expected. Taking advantage of what happened in the past, prospective scenarios integrating biological and socioeconomics issues will be highlighted. Models with socio-ecosystem approaches showing adaptations to changes will be discussed. This theme should address:    How to assess the evolution of estuaries and lagoons in the context of global change ?     What are the main processes that influence the transition from one status to another ?     Is multiple pathways a security for resilience and adaptation to change ?     Can we predict possible futures and necessary/wishable adaptations ?     How ecological theory help building prospective models ?     Can we describe decline trends or restoration trajectories ?     How biodiversity influence resilience in estuarine and lagoon ecosystem ?     How to deal with socioeconomic issues in environmental governance ? Key words : Global change, temperature impact, societal and economical changes, governance, trophic competition, contaminant, biodiversity, temporal trends, spatial trends, public policies adaptation, landscape analysis, patterns and processes, long-term studies5 -WISER The WISER project is developing methods for assessing and restoring aquatic ecosystems. The WISER consortium combines the European expertise in biological assessment, intercalibration, uncertainty estimation, modelling and restoration of freshwater and coastal marine ecosystems.We invite participants of the WISER project to present their result to the scientific community. This symposium would be an opportunity for WISER partners to present the state of the art before the end of the project expected in January 2012. Registration and Abstract submissionDeadline for abstract submission is postpone to 1st of JUNE 2011 .     Abstracts submission for oral presentations and / or poster is now open.     Adress to submit : contact@ecsa-bordeaux2011.fr&#160;     Abstracts of up to 300 words can be submitted.     A separate submission is required for each individual oral or poster presentation.     Authors can submit multiple abstracts. Registration feesRegistration will be soon open on line    Early registration, before 15 th July 2011            ECSA members 310 euros         Others 350 euros         Cemagref (1) 230 euros&#160;         Student 230 euros         Accompanying person (2)&#160; 30 euros&#160;             &#160;before 15 th July 2011 After 15 th July 2011             ECSA members 460 euros         Others 460 euros         Cemagref (1)300 euros         Student 300 euros         Accompanying person (2)&#160; 50 euros                     (1) Cemagref: registration fees to be paid by internal transfert.     (2) Registration fees only for access to social events (including Welcome cocktail, excursion and symposium diner) This registration fees include:    access to the Symposium during 4 days of plenary sessions,     the welcome cocktail (24th October 2011),     one lunch and 2 coffee breaks per day (25 &#8211; 28 th October 2011),     all the documentation (programme, handbook, social events). That does not include:     Symposium Diner : 30&#8364;     Excursion to St-Emilion medieval city and vineyard: 45&#8364;     Accommodations. Cancellation&#8220;In case you would have to cancel your registration to the symposium, the total fees could be refunded until the 23/09/2011. After this date refund will not be possible&#8221; Scientific Committee composition :    Pr. Genevi&#232;ve Barnaud, Mus&#233;um National d&#8217;Histoire Naturelle, France     Dr. Angel Borja, AZTI, Spain     Dr. Gabrielle Bouleau, Cemagref, France     Dr. Franck Bruchon, Agence de l&#8217;eau Seine Normandie, France     Dr. Steve Colclough, Environment Agency, UK     Dr. Jeffrey Dambacher, CSIRO, Australia     Pr. Antoine Gr&#233;mare, University of Bordeaux, France     Dr Christian L&#233;v&#234;que, GIP Seine aval, France     Pr. Nathalie Lewis, Universit&#233; du Qu&#233;bec &#224; Rimouski, Canada     Dr. Fiona Mackay, South African Institute for Aquatic Biodiversity, South Africa     Pr. Joao Carlos Marqu&#232;s, IMAR, Portugal     Dr. Nathalie Niquil, Universit&#233; de La Rochelle, France     Pr. Angel Perez Ruzafa, University of Murcia, Spain     Dr. Erika Van Den Berg, INBO, Belgique Keynote SpeakersThe list is not yet complete and will be very soon extended    Dr. Gabrielle Bouleau, Cemagref, France     Dr. Steve Colclough, Environment Agency, UK     Dr. Jeffrey Dambacher, CSIRO, Australia     Pr. Nathalie Lewis, Universit&#233; du Qu&#233;bec &#224; Rimouski, Canada     Dr. Patrick Steyaert, Institut National de la Recherche Agronomique (INRA), France     Dr. S&#233;bastien Treyer, Institut du D&#233;veloppement Durable et des Relations Internationales (IDDRI), France     Dr Michael P. Weinstein, Institute for Sustainability Studies (PSEG), USA 