The molluscan fauna of the Velké Doly Natural Reserve was surveyed in 1999 and 2006. In total, 27 snail species were found (26 terrestrial gastropods and 1 bivalve). The Natural Reserve is only 1.5 km far from ironworks “Třinecké železárny”. In the 18th century, there was a limestone quarry and beech plantation (as a fuel for ironworks) in the reserve. At the present time the reserve represents the secondary forests society Tilio cordatae-Carpinetum with protected and regional notable plants in undergrowth (Cephalanthera damasonium, Lilium martagon, Arum alpinum, Hacquetia epipactis, etc). The present character of the Velké Doly Natural Reserve is a result of human activities, nevertheless it is preserved and favourable site for molluscs, since many stenotopic and endangered woodland species occur there (e.g. Discus perspectivus, Petasina unidentata, Oxychilus glaber). The presence of the vulnerable snail Discus perspectivus is notable as first locality in Poland part of Těšín region (the Natural Reserve Velké Doly is located on the Poland border). Occurrence of euryecious species Arion distinctus, Arion lusitanicus and Limax maximus could relate with some human impact (e.g. presence of allotted gardens colony).
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