Regulation of plankton by omnivore cyprinids in a shallow lake in the Kis-Balaton Reservoir System

• Published in: Hydrobiologia Vol. 504; no. 1-3; pp. 241 - 250
• Main Authors: TATRAI, Istvan, MATYAS, Kalman, KORPONAI, Janos, PAULOVITS, Gabor, POMOGYI, Piroska, HERI, Janos
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Dordrecht Springer 01.09.2003; Springer Nature B.V
• Subjects: Algae; Animal, plant and microbial ecology; Applied ecology; Aquatic plants; Biological and medical sciences; Conservation, protection and management of environment and wildlife; Cyprinidae; Environmental degradation: ecosystems survey and restoration; Eutrophication; Fecundity; Freshwater; Fundamental and applied biological sciences. Psychology; Lakes; Limnology; Phytoplankton; Regulation; Reservoirs; Water depth; Water quality; Zooplankton; Hungary; Europe; Hungary, Kis-Balaton Reservoir; Trophic structure; Algae; Omnivorous; Trophic relation; fish manipulation; Eutrophication; Freshwater environment; fish predation; Vertebrata; reservoir system; Food web; Pisces; Artificial lake; Water quality; Phytoplankton; Ecological recovery; Cyprinidae; Predator; Biomanipulation; Invertebrata; Zooplankton; Thallophyta
• ISSN: 0018-8158; 1573-5117
• DOI: 10.1023/B:HYDR.0000008524.29013.48

Issue Title: Reservoir Limnology and Water Quality 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^sup -1^ of fish and restocking with 134 kg ha^sup -1^ of cyprinids. The removal of about 50% of cyprinid had a quite considerable impact on almost all of the observed parameters. Summer mean chlorophyll a values in 2000 decreased by 43%, phytoplankton community changed from being dominated by filamentous blue-greens causing blooms in 1999 to a much more diverse community with, e.g., green algae, dinoflagellates and cryptomonads in the year following fish removal. The zooplankton community showed the typical composition of lakes with very high predation pressure of omnivorous cyprinid fish leading to a decrease in both mean body length and fecundity of daphnids.[PUBLICATION ABSTRACT]