In industrial areas, woodland ponds are refuges of biological diversity. The impact of environmental
factors such as the physico-chemical properties of water, organic matter content in bottom
sediments and various types of substratum on the occurrence of Hippeutis complanatus were assessed.
In Poland, it is considered to be a species with an established but unspecified risk, deserving
the status of endangered species due to the decline of wetland environments. A Canonical Correspondence
Analysis (CCA) revealed associations between the distribution patterns of freshwater
snails species and the concentration of nitrates (NO3) and calcium (Ca) as well as pH and the
organic matter content in the bottom sediments. Based on statistical relationships, results of study
suggest that the kind of substratum (Typha latifolia remains, Phragmites australis remains, fallen
leaves of waterside trees) has an impact on the occurrence of freshwater snails including Hippeutis
complanatus for which the preferred substratum is the fallen leaves of waterside trees and sites
with a high content of organic matter in bottom sediments. The study has shown that isolated
water bodies located in forest complexes can be refuges for species that occur in small numbers in
other types of aquatic environments.