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Structural and Functional Changes in a Lake Bacterial Community Exposed to Multiple Stress Regimes
Stockholm University, Faculty of Science, Stockholm Resilience Centre.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 40 credits / 60 HE creditsStudent thesis
Abstract [en]

Bacterial community resilience and resistance may play an important role in a world affected by climate change and increasing environmental disturbances. In this study we examined the resilience of a bacterial lake community from Lake Ekoln, Sweden, under increased environmental stress. The community was exposed to various stress regimes of altered temperature and salinity to answer the questions if and how higher amounts of stress influence the bacterial community in terms of its community structure and functionality. We measured bacterial productivity, ecto-enzyme activities and changes of fluorescent dissolved organic matter to evaluate the community's functional responses under stress and used terminal-restriction length polymorphism (TRFLP) to assess the community's structural characteristics over time. Although bacterial community composition (BCC) changed constantly under changing environmental conditions, community functionality remained high and the community performed well under the various stress regimes. Our results suggest that the Lake Ekoln bacterial community is highly resilient considering the investigated stresses, and its adaptive capacity is high due to the community's inherent adaptability and redundancy.

Place, publisher, year, edition, pages
2015. , 61 p.
Keyword [en]
bacterial community, microbial community, resilience, resistance, microbiology, environmental change, limnology, Sweden, Ekoln, bacterial productivity, enzyme activity, DOM, spectrometry, T-RFLP, NMDS, environmental fitting, microbial ecology
National Category
URN: urn:nbn:se:su:diva-118596OAI: diva2:824898
Available from: 2015-06-23 Created: 2015-06-22 Last updated: 2015-06-23Bibliographically approved

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