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Springs are one of important freshwater habitats in the Dynaric Mountains. Nevertheless,there were no intensive studies on dipteran communities in the region. Here we present anecological analysis of Chironomidae communities recorded from a set of 27 springs alongthe Cvrcka River mainstream (the Republic of Srpska, Bosnia and Herzegovina).Environmental classification of Cvrcka springs divide them into three groups reflectingthe level of human impact. Chironomidae communities divide investigated springs into threegroups more dependent on bottom substrate quality. CCA indicates that the hard bottom andaltitude are primary (significant) factors determining midge assemblages. Secondaryfactors influencing communities are oxygen concentration and conductivity. There are cleardifferences in diversity and abundance in these three types of spring communities. Type IIaggregates natural sites for Cvrcka valley. Samples characterized by high abundance ofChironomus seems to be an outliers in Cvrcka canyon. Eucrenon andhypocrenon communities are distinct, but no differences in the diversity level or theenvironmental assemblage relation were recorded for both mesohabitats. This study provesthat solely environmental classification of spring habitats reflects well human impact,but invertebrate communities may not clearly follow general classification, reacting to aset of natural and altered conditions

Ecological patterns of Chironomidae assemblages in Dynaric karst springs