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Vervier, A. Duchein, M. Pusch, V. Mohaupt, M. Morais, A. Matoso, S. Gafny, D. Pargament, M. Zanen2 A contribution from the ELOISE project: STREAMES The European-funded project STREAMES aims at building an Environmental Decision Support System to serve as a tool for managing small (50-500 km2) Mediterranean catchments. Initiated in 2001, the project involves partners from 17 institutions and 8 countries, including both research teams from universities as well as water managers from regional water agencies (the so-called end users). The Environmental Decision Support System prototype, composed by the Expert System, model and GIS capabilities, will support and advice water agencies in the management of human-altered streams. The Expert System will be based on a knowledge base gathered from expert knowledge provided by the participating water managers, published literature, and original research. This communication describes the knowledge acquisition process and representation step of the Expert System. The complex management of environmental systems requests this kind of tools to be applied in order to integrate diverse sources of knowledge. This project presents an integrated perspective since the Expert System combines knowledge acquired from water managers experiences, general knowledge from literature and specific and basic research from stream ecology scientists. The solutions provided by the Expert System consider land use practices within the catchment, sources of nutrient loads and their control and measures to increase the stream functionality. As far as we know, this will be the first time that an Environmental Decision Support System is proposed to estimate and evaluate uncertainties in the prediction of stream water quality and to support the decision of management actions. For more information on the STREAMES project: www.streames.org  Laboratori dДEnginyeria Quэmica I Ambiental, University of Girona, Spain  Departament dДEcologia, University of Barcelona, Spain  Centre dДEstudis Avanчats de Blanes (CSIC), Spain  Agшncia Catalana de lДAigua (ACA), Barcelona, Spain  Department of Limnology, University of Vienna, Austria  Natural History Museum of Crete, University of Crete, Greece  Eastern Crete Development Organisation (OANAK), Crete, Greece  Dipartamento di Biologia, Universitс di Roma “Tor Vergata”, Italy  Provincia di Roma, Italy  CNRS-CESAC, Universitщ Paul Sabatier,Toulouse, France  Agence de l`Eau Adour-Garonne, Toulouse, France  Institut fqr Gewasseroekologie und Binnenfisherei, Berlin, Germany  UBA, Federal Environmental Agency, Berlin, Germany  Centro de Ecologia Aplicada, Universidade de Щvora, Portugal  Water Department of the Regional Environmental Direction Alentejo DRA-AžŸІЇГДРСЫЬмнцчђѓ§ў   % & 3 4 A B O P _ ` b l m ƒ „ †  ‘  ž Ј Љ Е Ж С Т Э Ю и й ч ш ђ єыєнШнИнШнШнИнИнИнШнШнШнЈнШнШнЈнШннШнШнШнШнШнШнШнШнhbы0JCJ\mH sH hbыCJ\mH sH hЭ_хh1i.0JCJ\mH sH hЭ_хh”,О0JCJ\mH sH (jhЭ_хh”,О0JCJU\mH sH hЭ_хhz=иCJ\mH sH hЭ_х5CJ\hЭ_хhЭ_х5CJ\8žŸє ѕ &  ЉЊщъ5nЂиPд№(Z†№n$\$‡$њњјњњњњѓѓјёёёёёёёёёёёёёёёёёgdЭ_хgdЭ_хъˆ$ўўђ ѓ є ѕ & ^ } ~ Ћ Э Ю е ь № ё ї ј џ  m t ˆ ‰ Š м еЉЊщъыь567mnoяфжЬЦНГЦНГЦНЦНЦНЦНЦНЦНЦНЦНГЦНЦЏЈž”Œ…”zoz”h h mH sH h h”,ОmH sH h h”,Оh h”,Оjh”,О0JUhЭ_хhЭ_хCJ\ hЭ_хhЭ_хhЭ_хhЭ_хB*CJphџhz=иhЭ_хCJ hЭ_хCJhЭ_хhЭ_х5CJhbыhЭ_х5CJmH sH hz=иCJ\mH sH hЭ_хh”,О0JCJ\mH sH *opЁЂЃЄЖЙзийкѓOPQz€‘’Егдежя№ёђ'ѕъѕреЪТЪерОКЖКЏрОЖЈрЁšЁš“рˆ}uˆрj_jрj_h1i.h1i.mH sH h1i.h”,ОmH sH h1i.mH sH h1i.h1i.mH sH h1i.h”,ОmH sH hh”,О hh1i. hh h1i.h”,О h h”,Оh1i.h h”,Оh mH sH h h mH sH h h”,ОmH sH jh”,О0JUh h mH sH h h”,ОmH sH %'()*?@YZ[„†ˆŠю№ђєNPlnpr$$$$$[$\$]$^$†$‡$ˆ$‰$ѕыѕрирѕыЭТЭыОКГыЈ•ЈыОК“КГыОКГыОКˆ„zhЭ_хhЭ_хCJ\hbыh”,Оh”,ОmHsHUhmH sH hhmH sH hh”,ОmH sH hh”,Оhh”,Оh1i.h1i.mHsHh1i.h”,ОmHsHhmH sH h1i.h1i.mH sH jh”,О0JUh1i.h”,ОmH sH %, Щvora, Portugal  Institute for Nature Conservation research, Tel-Aviv University, Israel  Yarqon River Authority, Tel Aviv, Israel ‡$ˆ$‰$§ћ#1h;0А‚. 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