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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Microbiol. | doi: 10.3389/fmicb.2019.01714

Temperature response of planktonic microbiota in remote alpine lakes

  • 1Institute of Virology, German Research Center for Environmental Health, Germany
  • 2Institute of Virology, Technical University of Munich, Germany
  • 3Research Department for Limnology, Research Institute of Limnology, Mondsee, Faculty of Biology, University of Innsbruck, Austria

Alpine lakes are considered pristine freshwater ecosystems and sensitive to direct and indirect changes in water temperature as induced by climate change. The bacterial plankton constitutes a key component in the water column and bacterial metabolic activity has direct consequences for water quality. In order to understand bacterial response to global temperature rise in five alpine lakes located in the Austrian Alps (1700–2188 m a.S.L.) water temperature was compared within a decadal period. Depth-integrated samples were characterized in community composition by 16S rDNA deep-amplicon sequencing early (56 ± 16 (SD) days after ice break up) and later (88 ± 16 days) in the growing season. Within the ten years period, temperature rise was observed through reduced ice cover duration and increased average water temperature. During the early growing season, the average water temperature recorded between circulation in spring until sampling date (WAS), and the day of autumn circulation, as well as chemical composition including dissolved organic carbon influenced bacterial community composition. In contrast, only nutrients (such as nitrate) were found influential later in the growing season. Metabolic theory of ecology (MTE) was applied to explain the dependence of taxonomic richness on WAS in mathematical terms. The calculated activation energy exceeded the frequently reported prediction emphasizing the role of WAS during early growing season. Accordingly, the relative abundance of predicted metabolism related genes increased with WAS. Thus, the dominant influence of temperature after ice break up could be explained by overall climate change effects, such as a more intense warming in spring and an overall higher amplitude of temperature variation.

Keywords: high mountain lakes, Climate Change, Growing seasons, Nutrient level, metabarcoding, richness, Activation energy

Received: 13 Apr 2019; Accepted: 11 Jul 2019.

Edited by:

Haihan Zhang, Xi'an University of Architecture and Technology, China

Reviewed by:

Presentación Carrillo, University of Granada, Spain
Jianyin Huang, University of South Australia, Australia  

Copyright: © 2019 Jiang, Huang, Ma, Ru, Blank, Kurmayer and Deng. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence:
Prof. Rainer Kurmayer, Research Institute of Limnology, Mondsee, Faculty of Biology, University of Innsbruck, Research Department for Limnology, Innsbruck, Tyrol, Austria, Rainer.Kurmayer@uibk.ac.at
Dr. Li Deng, Institute of Virology, German Research Center for Environmental Health, Neuherberg, 85764, Germany, li.deng@helmholtz-muenchen.de