Eutrophication rate of lakes in the Jorka river system (Masurian Lakeland, Poland) : long term changes and trophic correlations

• Autorzy: Hillbricht-Ilkowska A.
• Języki publikacji: EN

Abstrakty

EN

No trends were found in long-term variation (between the 1970s and the 1990s) of basic trophic parameters (TP, TN, chlorophyll concentration, algal biomass, and water transparency) in five lakes of the river-lake system typical of a lakeland, hilly area (the Jorka river system, Masurian Lakeland). Recently, this lake chain maintains the historically developed trophic differentiation between deep, mesotrophic lake close to headwaters and shallow, eutrophic lake close to the outlet of the river. The only change found is the replacement of cyanobacteria dominating in the 1970s by dinoflagellates dominating in the 1990s. A strong correlation was found between TP loading to lakes and in-lake TP concentration in spring periods, however no correlation existed between TP and other trophic indices. On the other hand, the interrelations between SD, chlorophyll, and algal biomass were highly significant in summer periods and marginally significant in spring periods. This pattern was also found in other groups of lakes in the region. It is concluded that in hilly lakeland region, the river-lake systems draining small mosaic catchments are resistant to the further eutrophication (low nutrient loading, no point sources) and for this reason they tend to maintain the trophic conditions developed in the remote past.

Słowa kluczowe

EN

long-term studies of eutrophication; river-lake system; trophic correlations

• Wydawca: Museum and Institute of Zoology, Polish Academy of Sciences
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2002
• Tom: Vol. 50, nr 4
• Strony: 475--487
• Opis fizyczny: Tab., wykr.,Bibliogr. 23 poz.,

Twórcy

autor

Hillbricht-Ilkowska A.

• Institute of Ecology, Polish Academy of Sciences, Dziekanów Leśny, 05-092 Łomianki, Poland,

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