Dragonflies (Odonata) of the peat bog Wielkie Błoto (Eastern Poland). In 2009 and 2011, the Wielkie Błoto high and transitional peat bog in Zawieprzyce Kolonia was researched (51°22'26"N, 22°47'10"E, UTM: FB29, 13.5 km NE of Lublin). The peat bog with an area of 25.9 ha lies in a depression surrounded mainly by arable fields and buildings of the village of Zawieprzyce Kolonia. There are about 30 peat excavations on it, some of which are used as fish ponds or for fishing. 12 sites representing

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... disturbed peat bog and peat excavations of various types of usage were examined. 31 dragonfly species were found, including a number of peat bog specialists, some of which were very numerous (Lestes virens, Coenagrion hastulatum, Nehalennia speciosa, Sympetrum danae, Leucorrhinia pectoralis). Of key importance for their occurrence were: water reaction, its mineralization, water body morphology, the distance between the site and the peat bog border and the occurrence of some plant structures. The immediate vicinity of agrocenoses and the lack of a buffer zone caused that the outer part of the bog had partially transformed fauna, but the central part was well preserved. Particular attention was paid to the occurrence of Nehalennia speciosa, which was found in 9 sites. Its number on them was estimated at about 1000 individuals in general and on the entire peat bog – several thousand. The Wielkie Błoto marks the western border of a distribution island of this species, which includes mainly the Łęczna-Włodawa Plain. It is isolated (50-100 km from the nearest sites). At least four populations in this area are very large (several thousand individuals).