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Sci Rep

Title:		Grazing pressure-induced shift in planktonic bacterial communities with the dominance of acIII-A1 actinobacterial lineage in soda pans
Author(s):		Szabo A; Korponai K; Somogyi B; Vajna B; Voros L; Horvath Z; Boros E; Szabo-Tugyi N; Marialigeti K; Felfoldi T;
Address:		"Department of Microbiology, ELTE Eotvos Lorand University, Pazmany Peter stny. 1/C, Budapest, 1117, Hungary. attilaszabo@ttk.elte.hu. Department of Microbiology, ELTE Eotvos Lorand University, Pazmany Peter stny. 1/C, Budapest, 1117, Hungary. Centre for Ecological Research, Balaton Limnological Institute, Klebelsberg Kuno u. 3, Tihany, 8237, Hungary. Centre for Ecological Research, Danube Research Institute, Karolina ut 29, Budapest, 1113, Hungary"
Journal Title:		Sci Rep
Year:		2020
Volume:		20201116
Issue:		1
Page Number:		19871 -
DOI:		10.1038/s41598-020-76822-8
ISSN/ISBN:		2045-2322 (Electronic) 2045-2322 (Linking)
Abstract:		"Astatic soda pans of the Pannonian Steppe are unique environments with respect to their multiple extreme physical and chemical characteristics (high daily water temperature fluctuation, high turbidity, alkaline pH, salinity, polyhumic organic carbon concentration, hypertrophic state and special ionic composition). However, little is known about the seasonal dynamics of the bacterial communities inhabiting these lakes and the role of environmental factors that have the main impact on their structure. Therefore, two soda pans were sampled monthly between April 2013 and July 2014 to reveal changes in the planktonic community. By late spring in both years, a sudden shift in the community structure was observed, the previous algae-associated bacterial communities had collapsed, resulting the highest ratio of Actinobacteria within the bacterioplankton (89%, with the dominance of acIII-A1 lineage) ever reported in the literature. Before these peaks, an extremely high abundance (> 10,000 individuum l(-1)) of microcrustaceans (Moina brachiata and Arctodiaptomus spinosus) was observed. OTU-based statistical approaches showed that in addition to algal blooms and water-level fluctuations, zooplankton densities had the strongest effect on the composition of bacterial communities. In these extreme environments, this implies a surprisingly strong, community-shaping top-down role of microcrustacean grazers"
Keywords:		"Actinobacteria/*classification/genetics/growth & development Animals Cladocera/*microbiology Copepoda/*microbiology DNA, Bacterial/genetics Extreme Environments Grassland Herbivory Lakes/*microbiology Phylogeny Phytoplankton/classification/*microbiology S;"
Notes:		"MedlineSzabo, Attila Korponai, Kristof Somogyi, Boglarka Vajna, Balazs Voros, Lajos Horvath, Zsofia Boros, Emil Szabo-Tugyi, Nora Marialigeti, Karoly Felfoldi, Tamas eng Research Support, Non-U.S. Gov't England 2020/11/18 Sci Rep. 2020 Nov 16; 10(1):19871. doi: 10.1038/s41598-020-76822-8"