Modelling Community Structure in Freshwater Ecosystems
Sovan Lek, Michele Scardi, P.F.M Verdonschot, J.-P. Descy, Young-Seuk Park
Springer Science & Business Media, Feb 14, 2005 - Science - 518 pages
The landmass on which we live is an integral part of our water catchment. Any human - tivity will inevitably have some consequences on the availability and composition of fresh waters. These consequences are becoming increasingly important and detectable as the - man population grows. The problem is to be addressed at the global scale, as frequently, decisions made have inter-regional and international impacts, and must therefore be coor- nated. In a number of European Member States, for example, the availability of water - sources depends on the activities of other upstream countries. The demand for fresh water in Europe, as well as in the world, is increasing. There is an upward pressure on European water demand for public supplies (drinking water, recreation, etc. ), for industry, and for - rigated agriculture. The ecological impacts of different uses are complex, and currently not always predictable. This book should help planners in their decisions on different water management options for human use. Water, of course, is not only relevant as a resource, exploited for human activities, but it is also relevant to aquatic ecosystems and to their quality. Preservation and restoration of the ecological quality of these ecosystems have a major social impact, as it has been stressed in several European Community actions.
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abundance algorithm altitude analysis ANN models applied artificial neural networks Asellidae assessment backpropagation benthic benthic macroinvertebrate biological biotic characteristics Chon classes classification clupeid clusters coefficients community changes community structure complex correlation corresponding cyanobacteria database dataset defined Descy developed diatom diatom assemblages distance distribution ecoregions environmental variables EPTC factors fish assemblages function Garonne Giraudel gradient groups habitat impact indicator input variables input vector Invertivorous Kohonen Lake Kasumigaura Lange-Bertalot linear macroinvertebrate methods MIR-max Nakdong River Navicula neurons nodes non-linear number of taxa Oberdorff observed ordination output layer PAEQANN parameters patterns percentage Pilica pollution predicted present region regression relationships sampling sites saprobity scale selected self-organizing map sensitivity showed similar species richness statistics strategy streams subset SVMs Table taxa taxon techniques tion unsupervised learning values Verdonschot visualisation water quality weight vectors Zwalm