Search for: [Abstract = "According to point and nonpoint sources for 1976 and 1990 Great Masurian Lakes are seriously endangered by nutrients. Out of twelve lakes examined seven has high external loading of nitrogen and phosphorus exceeding the unacceptable loading determined by VoIenweider \(1971\). Point sources are responsible for phosphorus loading of Great Masurian Lakes and nonpoint sources – for nitrogen loading. Protection of these ecosystems is absolutely necessary."]

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