L. Forró szerk.: Miscellanea Zoologica Hungarica 10. 1995 (Budapest, 1995)
Gulyás, P., Bancsi, I.; Zsuga, V.: Rotatoria and Crustacea fauna of the Hungarian watercourses
7. Hernád Belongs to the streams characterized by higher water flow. On the upper stretch light and flow conditions are unfavorable to the growth of planktonic organisms (0.01 -0.02 g/m J biomass values), while towards the confluence flow velocity decreases followed by the consequent increase in abundance values, biomass values between 0.01 - 0.38 g/m\ Apart from planktonic organisms (Brachionus, Cephalodella, Keratella, Trichocerca spp) benthic organisms from the sediment surface (Conochilus, Encentrum, Rotaria spp) occurred in the water body. 8. Bodva Amongst the species, planktonic, metaphyton and characteristic benthic organisms were found. During the investigated time interval 60 Rotatoria, 2 Cladocera and 1 Copepoda taxa have occurred. In spring low biomass values were characteristic, while by late summer, especially at lower river stretches some Rotatoria species (e.g., Keratella cochlearis, K. cochlearis tecta, Brachionus angularis, Anuraeopsis fissa, Pompholyx complanata) were identified in large numbers (13.3 g/m 3 biomass). These values are already indicating values near to the eutrophic lakes. 9. Hangony Zooplankton fauna of the creek is poor both in quantitative and qualitative terms. Most of the 22 Rotatoria and 1 Cladocera taxa belonged to planktonic elements. Biomass values were low during the vegetation period, with values of 0.01 - 0.24 g/irf . 10. Jósva As a result of high flow velocities, the abundance of the Zooplankton community was found to be small throughout the overall investigation period. Species composition is poor, only 8 Rotatoria and 1 Crustacea taxa occurred. These were cosmopolitan species. Quantitative biomass values indicate low trophic state (max. biomass 0.01 g/m 3 ). 11. Sajó Significant improvement in water quality can be observed at the border section of the river compared to previous years. Large quantity of pollutants reach the river in the vicinity of Miskolc. The water is rich is organic matter and Zooplankton biomass (max. 9.88 g/m ) is high, dominated by Brachionus, Keratella Bdelloidea and Rotatoria species. Near to the confluence, the natural regeneration can be observed, in many instances variable composition in Zooplankton community is registered. During the investigated time period 81 Rotatoria, 4 Cladocera and 1 Copepoda taxa occurred. Most of the new Rotatoria species for Hungary were found in this river. 12. Eger-patak Species number of Rotatoria is medium (59 taxon), while the Crustacea fauna is poor both from qualitative and quantitative point of view. The creek is rich in organic nutrients, frequently heavily polluted. Zooplankton biomass was therefore small or medium (0.01-1.39 g/m 3 ). Beside the
