Gábor Paulovits

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In 1995 the authors studied the effect of differentfish communities on the structure of the cladoceranplankton in a shallow hypertrophic lake. After a fishkill of 1991, different fish communities developedin the Kazetta and the outer area of the Kis-Balatonreservoir. In the outer area of the reservoir, thedensities of plankton feeding fish species(More)
A long-term food web manipulation experiment was started in 1999 with monitoring in the eutrophic shallow Major Lake (area 11 ha, mean depth 1.1 m). In 2000, studies were continued with removal of 204 kg ha−1 of fish and restocking with 134 kg ha−1 of cyprinids. The removal of about 50% of cyprinid had a quite considerable impact on almost all of the(More)
The effects of mature benthivorous cyprinid fish and theirrecruitment on sediment resuspension, turbidity, phyto- andzooplankton, and benthic macroinvertebrates were studied in fourexperimental ponds. The ponds were stocked with bream (Abramisbrama L.), white bream (Blicca bjoerkna L.), roach (Rutilus rutilus L.) and wild carp (Cyprinus carpio L.) of3+–5+(More)
Effects of different fish communities on the proportion of different nitrogen and phosphorous forms and the amount of phytoplankton (chlorophyll a) were examined in two consecutive years (1992–1993) in three Hungarian shallow water reservoirs (Cassette and outer reservoir of the Kis–Balaton Water Protection System, and Marcali reservoir). Possible(More)
The littoral zone of Lake Balaton and its periphyton-zooplankton-fish communities have been investigated intensively in recent years. Total average number of crustacean plankton varied from 36 to 126 ind l−1, their biomass from 0.49 to 1.86 mg ww l−1 month−1 at different areas of the littoral zone. In general, these values for the above parameters were(More)
Contrary to earlier observations the food composition of bream (Abramis brama L.) in Lake Balaton has changed in parallel with eutrophication. These changes were probably caused by increased population density and connected with density dependent growth as well as sharpened inter- and intraspecific competition in the cyprinid community. According to the(More)
The Fish Invasiveness Screening Kit (FISK) has proved to be a useful tool for assessing and screening the risk posed by potentially invasive fish species in larger risk assessment (RA) areas (i.e. country or multi-country level). In the present study, non-native freshwater fishes were screened for a smaller RA area, the closed and vulnerable but(More)
This study shows that multiyear control of phytoplankton by grazing is possible in otherwise cladoceran dominated ecosystems at low cyprinid fish stocks (around 100 kg ha−1) and where piscivore populations, following manipulation measure, can be sustained at the biomass ratio >15%. This reinforces the idea that fish community structure may be a key to the(More)
Intraspecific morphological variability may reflect either genetic divergence among groups of individuals or response of individuals to environmental circumstances within the frame of phenotypic plasticity. Several studies were able to discriminate wild fish populations based on their scale shape. Here we examine whether the variations in the scale shape in(More)
The main function of the Kis-Balaton Water Protection System is to retain nutrients and total suspended solids, thus protecting the water quality of Lake Balaton. In this paper, the toxic nature of the sediment in the 2nd reservoir of the KBWPS has been characterised, using a battery of tests: Vibrio fischeri acute bioassay on whole sediment samples, and V.(More)