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  4. Climate-related changes of soil characteristics affect bacterial community composition and function of high altitude and latitude lakes
 
research article

Climate-related changes of soil characteristics affect bacterial community composition and function of high altitude and latitude lakes

Rofner, Carina
•
Peter, Hannes  
•
Catalán, Núria
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2017
Global change biology

Lakes at high altitude and latitude are typically unproductive ecosystems where external factors outweigh the relative importance of in-lake processes, making them ideal sentinels of climate change. Climate change is inducing upward vegetation shifts at high altitude and latitude regions that translate into changes in the pools of soil organic matter. Upon mobilization, this allochthonous organic matter may rapidly alter the composition and function of lake bacterial communities. Here, we experimentally simulate this potential climate-change effect by exposing bacterioplankton of two lakes located above the treeline, one in the Alps and one in the subarctic region, to soil organic matter from below and above the treeline. Changes in bacterial community composition, diversity and function were followed for 72 h. In the subarctic lake, soil organic matter from below the treeline reduced bulk and taxon-specific phosphorus uptake, indicating that bacterial phosphorus-limitation was alleviated compared to organic matter from above the treeline. These effects were less pronounced in the alpine lake suggesting that soil properties (phosphorus and dissolved organic carbon availability) and water temperature further shaped the magnitude of response. The rapid bacterial succession observed in both lakes indicates that certain taxa directly benefited from soil sources. Accordingly, the substrate uptake profiles of initially rare bacteria (copiotrophs) indicated that they are one of the main actors cycling soil-derived carbon and phosphorus. Our work suggests that climate-induced changes in soil characteristics affect bacterioplankton community structure and function, and in turn, the cycling of carbon and phosphorus in high altitude and latitude aquatic ecosystems. This article is protected by copyright. All rights reserved.

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Type
research article
DOI
10.1111/gcb.13545
Web of Science ID

WOS:000400445900018

Author(s)
Rofner, Carina
Peter, Hannes  
Catalán, Núria
Drewes, Fabian
Sommaruga, Ruben
Pérez, María Teresa
Date Issued

2017

Published in
Global change biology
Volume

23

Issue

6

Start page

2331

End page

2344

Subjects

allochthonous organic carbon

•

bacterial production

•

dissolved organic matter

•

diversity

•

heterotrophic

•

phosphorus limitation

•

terrestrial vegetation

•

treeline

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
RIVER  
Available on Infoscience
November 7, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/130938
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