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By: Brosens, Dimitri - Breine, Jan - Thuyne, Gerlinde van - Belpaire, Claude - Desmet, Peter - Verreycken, HugoType: ArticleIn: ZooKeysVolume: 475Series:Issue:Date: 2015Page Range: 119-145Publication Info: Pensoft Publishers 2015Subjects: brackish water ecosystem functioning Estuary Fish distribution fish-based index of biotic integrity freshwater LifeWatch observation occurrence open data River Meuse River Scheldt River Yser