In the year 2007 in the vicinity of Chełm (Central-Eastem Poland), the researches on dragonflies of carbonate fens and habitats associated with them or formed in the area (canals, small water bodies, ponds) were conducted. 34 dragonfly species were found, of which 32 with confirmed or probable de- velopment. The most frequent were as fol- lows: Lestes virens, Coenagrion puella, C. pulchellum, Somatochlora flavomaculata, Libellula quadrimaculata and Sympetrum danae. Carbonate fens as well as dystrophic waters connected with them were characte- rized by a specific dragonfly fauna - with no or very scarce some tyrphophiles (e.g. Aeshna juncea, Leucorrhiniapectoralis) and strong dominance of others (e.g. Lestes vi- rens, Somatochlora flavomaculata). Peat bog drying out caused the disorder of this arrangement: the extinction of tyrphophiles, the increase in number of eurytopes and in- cidence of thermophilous species like Lestes barbarus.
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