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Bacterioplankton community associated with the Baltic Sea spring bloom
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Marine microbial ecology)
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
Abstract [en]

Marine microbial communities are highly dynamic, respond to environmental drivers and change on spatial and temporal scales. In the Baltic Sea, recent surveys show that the salinity gradient structures bacterioplankton community composition. Yet, these surveys were conducted during summer when environmental conditions were relatively stable. The spring bloom is initiated by near-zero temperatures, depletes inorganic nutrients and is the major source of organic matter in the system. In this study, bacterioplankton dynamics, phytoplankton and environmental parameters were monitored during the transition of the spring bloom on transects across the Baltic Proper, from Finland to Germany. Using next generation amplicon sequencing of the 16S rRNA gene, we studied the bacterial community composition during the general transition of the plankton community from new to regenerated production. We show that on short temporal scales, the microbial community composition varies across large spatial scales. Gammaproteobacteria and Betaproteobacteria were highly abundant in the open Baltic Proper, and were strongly correlated to phosphate availability during early stages of the spring bloom. During the mature bloom stage, the bacterioplankton communities was highly similar along the entire transect, dominated by Bacteroidetes, Actinobacteria and Alphaproteobacteria. Compared to other surveys we found that salinity is not solely driving the Baltic Sea bacterioplankton community composition during spring bloom conditions. Thus, changes in nutrient availability, timing and transition of the bloom can act as selective forces, structuring microbial communities.

Place, publisher, year, edition, pages
2015.
Keywords [en]
16S rRNA amplicon sequencing, diatom spring bloom, marine bacteria
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:lnu:diva-42932OAI: oai:DiVA.org:lnu-42932DiVA, id: diva2:809091
Educational program
Akvatisk ekologi, masterprogram, 120 hp
Presentation
2015-04-27, A137, 13:00 (English)
Supervisors
Examiners
Available from: 2018-01-30 Created: 2015-04-30 Last updated: 2018-01-30Bibliographically approved

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Bunse, Carina

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf