title: [Ecologically tolerable levels of abiotic factors. Study of freshwater bodies in Asiatic part of Russia and Uzbekistan].
abstract: Ecologically tolerable levels (ETL) of environmental factors have been determined for freshwater ecosystems in Asiatic part of Russia and neighboring countries (basins of Ob, Yenisei, Lena, Amur, and Syr-Darya rivers). Inobservance of ecologically tolerable levels degrades ecological status of the ecosystems manifested as deviation from normal saprobic indices of phytoplankton, zooplankton, and periphyton as well as biotic indices of zoobenthos. The basins were compared by the calculated ETL values for over 40 physicochemical indices. The revealed ecologically tolerable levels were compared with the standard maximum tolerable concentrations.
authors.affiliation: Moscow State University, Vorob'evy gory, Moscow, 119899 Russia.
authors.forename: V N
authors.initials: VN
authors.lastname: Maksimov
authors.forename: V A
authors.initials: VA
authors.lastname: Abakumov
authors.forename: N G
authors.initials: NG
authors.lastname: Bulgakov
authors.forename: A P
authors.initials: AP
authors.lastname: Levich
authors.forename: A T
authors.initials: AT
authors.lastname: Terekhin
mesh_terms: D004463:Ecology; D004784:Environmental Monitoring / Q000379:methods*; D005618:Fresh Water / Q000737:chemistry*; D012426:Russia; D014610:Uzbekistan; D014873:Water Pollutants / Q000032:analysis*
chemical_list: D014873:Water Pollutants