title: [Assessment of the lakes' trophy levels].
abstract: OBJECTIVE
  To develop a method for assessment of lakes' trophy level combining acceptable levels of precision, complexity, and universality.
  
  
  METHODS
  Initial data on dynamics of qualitative and quantitative parameters of phytoplankton development, as well as meteorological and hydrochemical data obtained during comparative observation of two floodplane lakes of the Ural river, which differed on level of anthropogenic burden, were used in the study.
  
  
  RESULTS
  Information value of biotic and abiotic parameters for determination of floodplane basins' trophy level was established. By using regression analysis, mathematical model was developed which can determine the trophy level of lake-type basins with probability 86.5%. Advantage of this method is minimization of quantityof parameters used forbuilding of mathematical model suitable for determination and forecasting of lakes' trophy level.
  
  
  CONCLUSIONS
  Developed method was tested on the lakes in steppe Ural area. The method is handy and has high level of validity. It can be used during monitoring for assessment of ecologic and hygienic state of a lake for answering the question about its practical use.
authors.forename: N V
authors.initials: NV
authors.lastname: Nemtseva
authors.forename: T N
authors.initials: TN
authors.lastname: Iatsenko-Stepanova
authors.forename: O V
authors.initials: OV
authors.lastname: Bukharin
mesh_terms: D000818:Animals; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods*; D005618:Fresh Water / Q000737:chemistry / Q000382:microbiology; D008954:Models, Biological; D010839:Phytoplankton