* Corresponding authors

^a Joint Research Centre of the European Commission, Institute for Environment and Sustainability, Via Fermi, Ispra, VA, Italy
E-mail: faycal.bouraoui@jrc.it

^b SLU, Swedish University of Agricultural Sciences, P O Box 7062, UPPSALA, Sweden

^c Department of Environmental Monitoring Operations, Division of Integrated Environmental Quality Management, EGMASA (Andalusian Regional Ministry for the Environment), Johan G. Gutenberg, s/n. Isla de la Cartuja, Sevilla

^d Soils, land management & water quality Environment Group, ADAS, Wergs Road, Wolverhampton, UK

^e Finnish Environment Institute, P.O.Box 140, Helsinki, Finland

^f Public Research Centre-Gabriel Lippmann, Environment and Biotechnologies Research Unit, 41, rue du Brill, Belvaux, Grand-duchy of Luxembourg

^g National Environmental Research Institute, Department of Freshwater Ecology, Vejlsøvej 25, Silkeborg, Denmark

^h Bioforsk - Norwegian Institute for Agricultural and Environmental Research, Soil and Environment Division, Frederik A. Dahls vei 20, Norway

ⁱ VITUKI Consult, Kvassay Jenõ út 1, Budapest, Hungary

^j National Technical University of Athens, Faculty of Civil Engineering, Department of Water Resources, Hydraulic and Maritime Engineering, Iroon Politechniou 5, Zografou, Greece

^k Instituto di Ricerca sulle Acque (IRSA-CNR), Italy

^l Beture-Cerec. Montigny Le Bretonneux, Saint Quentin en Yvelines, France

^m Umweltbundesamt GmbH, Department Terrestrial Ecology, Spittelauer Lände 5, Austria

ⁿ Alterra, Environmental Science Group, P.O. Box 47, Wageningen, The Netherlands

^o Water Management Institute of the Lithuanian University of Agriculture, Parko 6, Vilainiai, Lithuania

^p RPS Consulting Engineers, Elmwood House, 74 Boucher Road, Belfast, Ireland

^q Institute of Systems Biology and Ecology AS CR, Na Sadkach 7, Ceske Budejovice, Czech Republic