title: Foam in the aquatic environment.
abstract: Foams are ubiquitous in the environment, commonly seen as discoloured patches on streams, rivers, lakes and sea water. They often are assumed to be anthropogenic in origin as they are aesthetically unpleasant, yet they frequently appear in pristine environments indicating a natural origin. In contrast to "hidden" chemical pollution, e.g. heavy metals, pesticides etc. the visibility of foam alarms the public. To derive more information on foam in freshwaters and marine ecosystems, a literature review was performed. Alongside with some basic considerations on the formation of foam, on methods to measure foam formation and on the legal aspects of foam on surface waters, the ecological importance of foam in the aquatic environment is discussed in this paper.
authors.affiliation: Institute for Water Quality, Resources and Waste Management, The Centre for Water Resource Systems, Vienna University of Technology, Karlsplatz 13/226, 1040 Vienna, Austria. kschilling@iwag.tuwien.ac.at
authors.forename: Katerina
authors.initials: K
authors.lastname: Schilling
authors.forename: Matthias
authors.initials: M
authors.lastname: Zessner
mesh_terms: D017753:Ecosystem; D005618:Fresh Water / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis; D045483:Rivers; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014876:Water Pollution / Q000009:adverse effects*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical