Author/Editor		Smolar-Žvanut, Nataša; Vrhovšek, Danijel
Title		The role of biological community for water management - the impact of reduced flow and pollution
Type		članek
Source		In: Slokar YM, Majcen-Le Marechal A, editors. Zbornik referatov Mednarodna konferenca 6. eko dnevi. 1. del; 2001 okt 11-12; Maribor. Maribor: Fakulteta za strojništvo, Inštitut za tekstilno kemijo, ekologijo in koloristiko,
Publication year		2001
Volume		str. 117-23
Language		eng
Abstract		In the running waters, there are water abstractions for drinking water, energetic use, fish farming, irrigation and technological purposes. Reduction in river flows after water abstraction and during low flow conditions result in hydrological, physicochemical and biological changes. In the river should be assure the quantity and quality of water which preserving ecological balance in the river and in the riparian zone, known as ecologically acceptable flow. That means that rare and endangered species have to survive, the quantittative proportions of plant and animal species and biocenosis have to be preserve, the ecosystem has to function as in the original ecosystem. The results of too large water abstraction for hydroelectric power plant from the river Tržiška Bistrica (Slovenia) caused the changes in ecological balance. The influence of the reduced flow was observed namely in changed species composition of periphyton, changed biomass, species deficit, higher water pollution, absence of fish and decreased current velocity. The impact of too large water abstraction in the summer and the winter were high values of periphyton biomass, where only a few species of periphyton were abundant. According the biological diversity in rivers we can conclude that before large intervention of man, the concern section should be inventoried and the species diversity and ecological balance should be protected. It is important to develop a better understanding of natural water ecosystem variability in different hydrological regimes, which providing a better basis for predicting ecological impacts of management decisions. For sustainable river management ecologically acceptable flow for running waters should be determined.
Descriptors		FRESH WATER WATER POLLUTANTS POWER PLANTS ECOSYSTEM BIOMASS ALGAE