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2 Polish Journal of Ecology

2 2002

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Wetland patches (Potholes) in a mosaic landscape (Masurian Lakeland, Poland) : floristic diversity and disturbance

Wilpiszewska I., Kloss M.

Polish Journal of Ecology

2002

Vol. 50, nr 4

515-525

In 1999 the vegetation of 145 small (1 ha) wetlands was analysed in the Inulec Lake catchment, which makes up a part of the Jorka River-Lake system (the Masurian Lakeland, north-eastern Poland). In total, 22 plant communities were identified at their distribution was described. Willow communities were the most frequent in the examined area. Changes occuring in phytocoenoses over the period of 20 years were assessed. Most of the plant communities have retained their natural character.

Diversity, disturbance and spatial structure of wetland vegetation along a lake shore : Jorka river-lake system (Masurian Lakeland, Poland

Kloss M., Wilpiszewska I.

Polish Journal of Ecology

2002

Vol. 50, nr 4

489-513

In 1997-1999, phytosociological studies of the riparian vegetation were conducted in the Jorka River-Lake system, Masurian Lakeland, Poland. This vegetation performs an important function as a barrier for various chemicals, counteracting lake eutrophication. In total, 26 plant communities were identified. The riparian vegetation was represented by phytocoenoses of the classes: Alnetea glutinosae, Salicetea purpureae, Querco-Fagetea, Artemisietea and Molinio-Arrhenatheretea. The littoral vegetation comprised phytocoenoses of the classes Phragmitetea and Potamogetonetea. Plant communities typically occur in the form of strips along rivers or lake shores, and on rare occasions in the form of mosaics of overlapping patches. The degree of the transformation of riparian vegetation relative to its natural state was estimated. The plant cover was disturbed by man along 80% of the shoreline length. Spatial distribution of phytocoenoses was analysed in details along 13 transects.