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Articles

On the occurrence of Cordulegaster boltonii (Donovan, 1807) (Odonata: Cordulegastridae) in the western part of the Lithuanian Lake District (Poland)

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Pages 198-202 | Received 25 Sep 2012, Accepted 31 Oct 2012, Published online: 27 Nov 2012
 

Abstract

The authors analyse three sites of occurrence of Cordulegaster boltonii in the western part of the Lithuanian Lake District (Suwałki Region, north-east Poland). The area is situated within a distance of over 300 km between large agglomerations of the species’ sites in the Tuchola Forest (north Poland) and in south-east Lithuania. Only one historical site is known so far from the study area (from 1911). A small but permanent distribution island probably exists in the study area, although C. boltonii is rare and develops in small populations. A research programme is required to explain the size of the distribution island, its relations to the sites in Lithuania and the status and threats to the species.

Aprašomos trys geltonžiedžio žirgelio C. boltonii radavietės vakarinėje Lietuvos ežeryno dalyje (Suvalkai, šiaurės rytų Lenkija). Tiriama teritorija yra tarp didelių rūšies radaviečių sankaupų Tucholos miške (šiaurės Lenkija) ir pietryčių Lietuvoje, tarp kurių atstumas siekia 300 km. Iki šiol šioje teritorijoje buvo žinoma tik viena istorinė rūšies radavietė (nuo 1911 m.). Manome, kad čia egzistuoja nedidelė, tačiau pastovi šio reto žirgelio populiacija. Tačiau populiacijos dydžio, jos ryšių su kitomis populiacijomis Lietuvoje, rūšies statuso ir grėsmių jai įvertinimui reikalinga mokslinių tyrimų programa.

Acknowledgements

We are very grateful to Jakub Szymański for providing us with a C. boltonii specimen from Bludzie Małe and to Giedrė Višinskienė for translation of the Lithuanian abstract. We thank Povilas Ivinskis and Mārtinš Kalniņš for valuable comments to the first version of this paper.

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