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Shaped by the past: Resilience and ecological memory in microbial communities

Renes, Sophia (2021). Shaped by the past: Resilience and ecological memory in microbial communities. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-704-5
eISBN 978-91-7760-705-2
[Doctoral thesis]

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Microorganisms play a fundamental role in global biogeochemical cycles, which are increasingly being altered by the current rapid changes in the environment, threatening biodiversity and the provisioning of key ecosystem services. This thesis addresses key uncertainties surrounding the assessment of ecological resilience and the role of previous disturbances in shaping the stability especially of microbial communities to future disturbances. Firstly, a quantitative framework was developed for the assessment of ecological resilience, which combines current knowledge into a reiterative approach that gradually reduces uncertainty about the level of resilience in a system. Following this, I conducted laboratory experiments in which bacterioplankton communities were exposed to repeated disturbances, to investigate the role of disturbance history in shaping functional and structural stability under subsequent disturbances. I found that disturbance history can affect functional stability in response to both new and familiar disturbances, providing evidence of an “ecological memory” effect which then declined over time. In contrast, microbial community composition appeared to be dominated by a stochastic process, i.e. drift. This suggests the more deterministic responses of the microbial functions arose from sub-lethal effects of the disturbance on microbial activities rather than changes in community composition. These results highlight potential uncertainties associated with application of resilience frameworks developed for multicellular communities to microbial organisms, especially where non-deterministic drift dominates microbial community assembly, and variation in community structure is not strongly connected with variation in functioning.

Authors/Creators:Renes, Sophia
Title:Shaped by the past: Resilience and ecological memory in microbial communities
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2021
Number of Pages:71
Publisher:Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-704-5
ISBN for electronic version:978-91-7760-705-2
Publication Type:Doctoral thesis
Article category:Other scientific
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:Ecological resilience, stability, bacterioplankton, community assembly, ecological memory, disturbance history, drift
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ID Code:22413
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:16 Feb 2021 11:23
Metadata Last Modified:22 Dec 2021 11:58

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