Structure and seasonal dynamics of the protozoan community (heterotrophic flagellates,ciliates, amoeboid protozoa) in the plankton of a large river (River Danube,Hungary) |
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| Authors: | Áron Keve Kiss Éva Ács Keve Tihamér Kiss Júlia Katalin Török |
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| Affiliation: | 1. Institute of Ecology and Botany of the Hungarian Academy of Sciences, Hungarian Danube Research Station, H-2131 Göd, Jávorka S. u. 14, Hungary;2. Department of Systematic Zoology and Ecology, Institute of Biology, Eötvös Loránd University, Budapest, H-1117 Budapest, Pázmány P. stny. 1/c, Hungary;1. Department of Invertebrate Zoology, Faculty of Biology and Soil Sciences, Saint Petersburg State University, Russia;2. Department of Terrestrial Ecology, Faculty of Zoology, University of Cologne, Germany;1. Department of Terrestrial Ecology, Zoological Institute, Cologne Biocenter, Zülpicher Str. 47b, University of Cologne, 50674 Cologne Germany;2. Department of Invertebrate Zoology, Faculty of Biology and Soil Sciences, St. Petersburg State University, Universitetskaja nab. 7/9 199034 Saint-Petersburg, Russia;1. Fisheries Research Institute, Anhui Academy of Agricultural Sciences, Hefei 230031, China;2. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;1. Department of Hydrobiology, Lomonosov Moscow State University, Moscow 119899, Russia;2. Institute of Biology of the Southern Seas, Pr. Nakhimova, 2, Sevastopol 99011, Ukraine;3. Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok 152742, Russia;4. Department of Zoology and Ecology, Penza State University, Penza 440026, Russia |
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| Abstract: | Seasonal dynamics of all major protozoan groups were investigated in the plankton of the River Danube, upstream of Budapest (Hungary), by bi-weekly sampling over a 1-year long period. Sixty-one heterotrophic flagellate, 14 naked amoeba, 50 testate amoeba, 4 heliozoan and 83 ciliate morphospecies were identified. The estimated abundance ranges of major groups throughout the year were as follows: heterotrophic flagellates, 0.27–7.8×106 ind. l?1; naked amoebae, max. 3300 ind. l?1; testaceans, max. 1600 ind. l?1; heliozoans, max. 8500 ind. l?1; ciliates, 132–34,000 ind. l?1. In terms of biovolume, heterotrophic flagellates dominated throughout the year (max. 0.58 mm3 l?1), and ciliates only exceeded their biovolume in summer (max. 0.76 mm3 l?1). Naked amoeba and heliozoan biovolume was about one, and testacean biovolume 1–3, orders of magnitude lower than that of ciliates. In winter, flagellates, mainly chrysomonads, had the highest biomass, whilst ciliates were dominated by peritrichs. In 2005 from April to July a long spring/summer peak occurred for all protozoan groups. Beside chrysomonads typical flagellates were choanoflagellates, bicosoecids and abundant microflagellates (large chrysomonads and Collodictyon). Most abundant ciliates were oligotrichs, while Phascolodon, Urotricha, Vorticella, haptorids, Suctoria, Climacostomum and Stokesia also contributed significantly to biovolume during rapid succession processes. In October and November a second high protozoan peak occurred, with flagellate dominance, and slightly different taxonomic composition. |
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