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This joint work generalizes the results of the Krasnoyarsk water reservoir ecological monitoring held by the faculty, researchers and students of Krasnoyarsk State Universityа (at the moment Siberian Federal University) in 1977-2005. For the first time during the existence of the Krasnoyarsk water reservoir the many years monitoring survey resulted in the analysis of synchronously gained hydrological, hydro-chemical and hydrobiological materials; species compositions of phyto-, zooplankton, zoobenthos, periphyton have been listed; fish physiological biochemical characteristics have been given. Biota structural functioning organization, its productive-destructive dynamics have been shown. Regression equations have been calculated by quantitative link between average-vegetation and august values of the biota components' density, production and destruction. The complex evaluation of the water quality by its chemical and biological (bio-indication, bio-testing) descriptors has been done for the first time; the following systems modified for the Krasnoyarsk water reservoir have been developed: «system of saprotaxob analysis», «Woodiviss biotic index system», «Unified classifier of water quality assessment by chemical and biological values»; the ecosystem condition has been evaluated by many-year monitoring survey of phyto-, and zooplankton has been done and its ecological modifications have been determined. The mathematical aspects of the biota and water quality analysis and the computer model of the water reservoir ecosystem condition have been described for the first time. The monograph is aimed at professionals and students majoring in hydro-ecology, fish breeding industry, experts in environmental protection and use of water resources.

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Osteoporosis is a global health problem with increasing importance. It is a chronic, debilitating disease characterized by low bone density and deterioration of the micro architectonics of bone tissue. Although genetic factors largely determine the bone size and density, factors such as healthy eating, good physical activity and avoiding alcohol and smoking also play a key role. At all ages, healthy eating is an important factor in bone health. Aim: To study the eating habits that are important for bone health in women from Varna. Methods: A cross-sectional study of the eating habits of 139 women in Varna was conducted between January 2018 and March 2019. Questions, giving information on diet, frequency of consumption of certain food groups and beverages, affecting bone density, physical activity, demographic indicators are included in the questionnaire. Descriptive analysis of the data is done with SPSS version 19. Results: The average age of the participants was 29.86 ± 13.60 years. Daily consumption of milk and dairy products was found among 36.7% and 32.4% of the respondents respectively. The relative share of respondents who consume fish 1-2 times a week is 33.1%. The daily consumption of fruits and vegetables is 47.5% and 56.8% respectively. Conclusion: Nutrition plays an important role in reducing the risk of osteoporosis by affecting the development and maintenance of bone mass.