Blackfly assemblages (Diptera,Simuliidae) of the Carpathian river: habitat characteristics,longitudinal zonation and eutrophication

Investigations were carried out in 2003–04 within a project on trend biomonitoring of macrozoobenthos in the Hron River system. They were focused on blackfly assemblages of the Hron River (Slovakia), using the distribution patterns of blackflies (18 species) from 14 sites, representing a fluent transition from epirithral to epipotamal. Two main “sister” groups were distinguished using TWINSPAN analysis. Prosimulium rufipes is an indicator species within the first group. This group typically occurs in the zone representing a part of the river upstream and its tributaries. Simulium lineatum is an indicator species within the second group that occurs in the zone representing the middle and lower part of the river. The Upstream–Downstream gradient represents, in fact, the ecological position (EP) of the studied localities of the Hron River along the River Continuum Concept. The distribution fitting analysis divides the distribution amplitude data of blackfly species into three sets of nonoverlaping intervals: (1) 0.00–0.19 stenotopic (P. rufipes in the upper course of the river, Simulium erythrocephalum in the lower course of the river), (2) 0.20–0.39 mesotopic (Simulium argyreatum, S. equinum—hyporhithral) and (3) 0.40–0.50 eurytopic (Simulium reptans, S. variegatum). According to CCA the most important variables correlated with the first axis, and were linked to the nitrate and maximal water temperature which gradually increase from the upper stretch of the river. Handling editor: K. Martens