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Does charophyte meadow induce the spatial heterogeneity of water abiotic properties of a tachymictic Lake?

Pełechaty M.

Ekologia i Technika

2007

R. 15, nr 1

24-29

The study objective was to find out whether extensively developed charophyte meadow (built by Chora tomentosa) induce the spatial heterogeneity of basie physical-chemical water properties of a large, clearwater and tachymictic Lake and, so, with a long period of water overturn (Lake Lednica, Wielkopolska Region, mid-Western Poland) . Current trophic state might be assumed as moderately eutrophic with impressive water clariry. Submersed vegetation is well developed and predominated by charophytes forming dense beds. In the period of intense development of vegetation (between 17th May and 6th July 2004) physical-chemical analyses (water temperature, pH, oxygen concentration, conductMty, total dissolved substances) were performed five times at five sampling sites. Three of them were macrophyte-free open water regions (with varied contribution of charophytes in the phytolit-toral zone) and two further were shallow littoral sites: one close to a bathing place with sparse Tolypella glomerata specimens and the other in dense Chora tomentosa bed. The results showed lower conductivity and TDS values, and higher pH and the concentration of oxygen inside charophyte meadow as compared to the rest of sampling sites. By contrast, at the other littoral site but without plant cover conductivity and TDS revealed the highest values. Results are discussed in the light of habitat forming power of charophytes contrasted with long water overturned the Lake is subject to.