Hidrológiai Közlöny, 2015 (95. évfolyam)
2015 / 5-6. különszám - LVI. Hidrobiológus Napok előadásai
88 HIDROLÓGIAI KÖZLÖNY 2015. 95. ÉVF. 5-6. SZ. lakes (Batata lake and Mussurá lake) with different mixing regimes. Amazoniana 18:1-10. Nürnberg, GK. (1995): Quantifying anoxia in lakes. Limnology & O- ceanography, 40: 1100-1 111. Reichwaldt, E.S., Stibor, H. (2005): The impact of diel vertical migration of Daphnia on phytoplankton dynamics. Oecologia, 146: 50- 56. Salonen, K., Rosenberg, M. (2000): Advantages from diel vertical migration can explain the dominance of Gonyostomum semen (Raphi- dophyceae) in a small, steeply-stratified humic lake. Journal of Plankton Research, 22(10): 1841-1853. Smolander, U., Arvola, L. (1988): Seasonal variation in the diel vertical distribution of the migratory alga Cryptomonas marssonii (Cryptophyceae) in a small, highly humic lake. Hydrobiologia, 161: 89-98. T-Krasznai, E., Abonyi, A., Görgényi, J. (2013): A Malom-Tisza holtág nyári rétegződési stabilitása és oxigénviszonyai 2007-2010-ben. Hidrológiai Közlöny, 93(5-6): 81-83. Utermöhl, H. (1958): Zur Vervollkommnung der quantitativen Phytoplankton-Methodik. Mitteilunger der internationale Vereinigunk für theoretische und angewandte Limnologie 9, 1-38. Welch, E. B. (1992): Ecological effects of Waste Water. Chapman & Hall, London, pp. 455. Abstract: Keywords: stable Diurnal changes of phytoplankton in a stratifying oxbow E. T-Krasznai, V B-Béres, Zs. Kókai, P. Török, A. Abonyi The diel variation and vertical distribution of phytoplankton was studied in the stable stratified Malom-Tisza oxbow in 21 and 22th July, 2007. We aimed at to ask the following study question: (i) Can a diurnal pattem be observed in the stability of thermal stratification? (ii) Is there any diurnal pattem in the change of physico-chemical parameters? (iii) Can diurnal changes in the temporal pattem of phytoplankton assemblages be detected? The depth of epilimnion and euphotic zone was ~2 m, where the diel fluctuation in water temperature, dissolved oxygen and pH was considerable. A partial atelomixis was detected. The highest biomass of phytoplankton was found during the second part of the studied 24 hour. The atelomictic changes shaped the vertical distribution of phytoplankton biomass, which highlights its importance—possibly becoming more significant by the global climate change during the vegetation period—as a possible driving factor in determining dynamics in temperate standing waters, thermal stratification, oxbow-lakes, atelomixis, climate change. 1. ábra. A Malom-Tisza holtág napi vízoszlop stabilitás értékei (2007. július 21.-22.) 15h 18h 21h OOh 03h 06h 09h12h 6.9 2. ábra. A Malom-Tisza holtág napi (a) vízhőmérséklet (°C), (b) oldott oxigén (mgV1), és (c) pH napszakos változásai a vízmélység függvényében (2007. július 21.-22.)
