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Szukana fraza: [Abstract = "The thesis presents long\-term changes in water levels of Prosna, one of the main rivers in Wielkopolska, i.e. a region that commonly is considered as one of the least water\-rich in Poland.It was found that in the last 40 years, average annual water levels of Prosna were characterized by a downward trend of 7.8 cm\?dec\-1 and werestatistically significant at p=0.05 and also p=0.01.In all months, the water level dropped, although statistically it was significant in seven cases.The largest reduction in monthly average water levels \(statistically significant, p = 0.05\) was in August and December and it was progressing at a rate of 13.2 and 12.3 cm\?dec\-1.The consequence of this ongoing trend may be, among others, deterioration of living conditions of ichthyofauna, or worse water quality of Prosna."]

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