Hydrobiologia publishes original research, reviews and opinions investigating the biology of all aquatic environments, including the impact of human activities. Coverage includes molecular-, organism-, community- and ecosystem-level studies dealing with limnology and oceanography, including systematics and aquatic ecology. In addition to hypothesis-driven experimental research, it presents theoretical papers relevant to a broad hydrobiological audience. The Editor-in-Chief is Koen Martens, Royal Belgian Institute of Natural Sciences, Brussels. The Honorary Editor-in-Chief is Henri J. Dumont, University of Ghent, Institute of Animal Ecology, Belgium. New Special Issues online: Marine Ecosystems and Sustainability (vol. 670) Guest Editors: Graham J. Pierce, Vasilis D. Valavanis, Begoña M. Santos & Julio M. Portela Forthcoming Special Issue(s): The Thames Estuary and Estuaries of South East England Guest Editors: R.J. Uncles & S.B. Mitchell Restoration, biogeochemistry and ecological services of wetlands Guest Editors: Dominik Zak, Robert McInnes & Jörg Gelbrecht