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1 Odonatrix. Biuletyn Sekcji Odonatologicznej Polskiego Towarzystwa Entomologicznego

1 2009

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Przyczynek do wiedzy o ważkach (Odonata) Roztocza

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Buczynski P. , Karasek T. , Kowalak E. , Kowalak J. , Oder T.

nr 1

The paper presents the results of studies conducted in Roztocze Upland (SE Poland) during the camp of Student Scientific Circle of Biologists of Maria Curie-Skłodowska University in July 2008. At 27 study sites, of which 13 were situated in the Roztoczański National Park, 37 dragonfly species were found (51% of the national fauna). The most interesting were: Sympecma paedisca, Nehalennia speciosa, Gomphus vulgatissimus and Ophiogomphus cecilia. 9 species have been recorded for the first time from the Roztoczański National Park, which elongated the list of well-known species to the number of 47. The study site of Nehalennia speciosa (Borowina near Józefów, Caricetum lasiocaropae on the edges of the water body between dunes) has been known for over 10 years. New data confirms the subsistence of the population and even the decrease in numbers: at least >1.000 specimens, juvenile imagines and development behaviour were observed. At the same time, the disappearance of the other population of N. speciosa was found – on a transitional peat-bog near the village Hamernia (last data from 2002). Perhaps the same refers to the population of Somatochlora arctica on a transitional peat-bog near the village Tarnowola (last data from 2003). Other examples of vanishing of peat-bog species on Roztocze due to drying out of habitats are also given. Perhaps we are witnessing the start of regress of this ecologic group which has not been endangered up till now. Data about Gomphidae has been analyzed by their rarity in the discussed region which is surprising for Roztocze is rich in rivers with suitable habitat structure and satisfactory water quality. The authors give two possible explanations responsible for this conditions: forest basin of the rivers (which results in shading and low pH among others) as well as strong fish stocking of Roztocze rivers by trout by Polish Angling Association.