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Mayr MJ, Besemer K, Sieczko A, et al. Bacterial community composition and function along spatiotemporal connectivity gradients in the Danube floodplain (Vienna, Austria). Aquat Sci. 2020;82(2):28doi: 10.1007/s00027-020-0700-x.
Mayr, M. J., Besemer, K., Sieczko, A., Demeter, K., & Peduzzi, P. (2020). Bacterial community composition and function along spatiotemporal connectivity gradients in the Danube floodplain (Vienna, Austria). Aquatic sciences, 82(2), 28. https://doi.org/10.1007/s00027-020-0700-x
Mayr, Magdalena J, et al. "Bacterial community composition and function along spatiotemporal connectivity gradients in the Danube floodplain (Vienna, Austria)." Aquatic sciences vol. 82,2 (2020): 28. doi: https://doi.org/10.1007/s00027-020-0700-x
Mayr MJ, Besemer K, Sieczko A, Demeter K, Peduzzi P. Bacterial community composition and function along spatiotemporal connectivity gradients in the Danube floodplain (Vienna, Austria). Aquat Sci. 2020;82(2):28. doi: 10.1007/s00027-020-0700-x. Epub 2020 Feb 18. PMID: 32165802; PMCID: PMC7045780.
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Aquat Sci. 2020;82(2):28. doi: 10.1007/s00027-020-0700-x. Epub 2020 Feb 18.

Bacterial community composition and function along spatiotemporal connectivity gradients in the Danube floodplain (Vienna, Austria).

Aquatic sciences

Magdalena J Mayr, Katharina Besemer, Anna Sieczko, Katalin Demeter, Peter Peduzzi

Affiliations

  1. 1Department of Limnology and Oceanography, University of Vienna, Althanstrasse 14, 1090 Wien, Austria.
  2. WasserCluster Lunz, Dr. Carl Kupelwieser Promenade 5, 3293 Lunz Am See, Austria.
  3. 3Department of Thematic Studies-Environmental Change, Linköping University, Tema M, Campus Valla, 581 83 Linköping, Sweden.

PMID: 32165802 PMCID: PMC7045780 DOI: 10.1007/s00027-020-0700-x

Abstract

It is well recognized that river-floodplain systems contribute significantly to riverine ecosystem metabolism, and that bacteria are key players in the aquatic organic carbon cycle, but surprisingly few studies have linked bacterial community composition (BCC), function and carbon quality in these hydrologically highly dynamic habitats. We investigated aquatic BCC and extracellular enzymatic activity (EEA) related to dissolved organic carbon quality and algae composition, including the impact of a major flood event in one of the last remaining European semi-natural floodplain-systems. We found that surface connectivity of floodplain pools homogenizes BCC and EEA, whereas low connectivity led to increased BCC and EEA heterogeneity, supported by their relationship to electrical conductivity, an excellent indicator for surface connection strength. Hydrogeochemical parameters best explained variation of both BCC and EEA, while the algal community and chromophoric DOM properties explained only minor fractions of BCC variation. We conclude that intermittent surface connectivity and especially permanent isolation of floodplain pools from the main river channel may severely alter BCC and EEA, with potential consequences for nutrient cycling, ecological services and greenhouse gas emissions. Disentangling microbial structure-function coupling is therefore crucial, if we are to understand and predict the consequences of human alterations on these dynamic systems.

© The Author(s) 2020.

Keywords: Dissolved organic matter; Ecosystem processes; Flooding; Freshwater bacterial diversity; Hydrology

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