Abstract

Climate change is expected to increase the incidences of extremes in environmental conditions. To investigate how repeated disturbances affect microbial ecosystem resistance, natural lake bacterioplankton communities were subjected to repeated temperature disturbances of two intensities (25 degrees C and 35 degrees C), and subsequently to an acidification event. We measured functional parameters (bacterial production, abundance, extracellular enzyme activities) and community composition parameters (richness, evenness, niche width) and found that, compared to undisturbed control communities, the 35 degrees C treatment was strongly affected in all parameters, while the 25 degrees C treatment did not significantly differ from the control. Interestingly, exposure to multiple temperature disturbances caused gradually increasing stability in the 35 degrees C treatment in some parameters, while others parameters showed the opposite, indicating that the choice of parameters can strongly affect the outcome of a study. The acidification event did not lead to stronger changes in community structure, but functional resistance of bacterial production towards acidification in the 35 degrees C treatments increased. This indicates that functional resistance in response to a novel disturbance can be increased by previous exposure to another disturbance, suggesting similarity in stress tolerance mechanisms for both disturbances. These results highlight the need for understanding function- and disturbance-specific responses, since general responses are likely to be unpredictable.

Published in

Scientific Reports
2020, Volume: 10, number: 1, article number: 11333
Publisher: NATURE PUBLISHING GROUP

SLU Authors

• Gustafsson-Renes, Sophia

  • Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
    
  • Uppsala University

Sustainable Development Goals

Take urgent action to combat climate change and its impacts


UKÄ Subject classification

Ecology
Climate Research


Publication identifier

DOI: https://doi.org/10.1038/s41598-020-68104-0

Permanent link to this page (URI)

https://res.slu.se/id/publ/107207