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Identity and dynamics of putative N-2-fixing picoplankton in the Baltic Sea proper suggest complex patterns of regulation
University of Kalmar, School of Pure and Applied Natural Sciences.ORCID iD: 0000-0003-3083-7437
University of Kalmar, School of Pure and Applied Natural Sciences.ORCID iD: 0000-0001-9382-9296
University of Kalmar, School of Pure and Applied Natural Sciences.
2009 (English)In: Environmental Microbiology Reports, ISSN 1758-2229, Vol. 1, 145-154 p.Article in journal (Refereed) Published
Abstract [en]

Heterocystous filamentous cyanobacteria are regarded as the main N-2-fixing organisms (diazotrophs) in the Baltic Sea. However, some studies indicate that picoplankton may also be important. The aim of this study was to examine the composition of putative diazotrophs in the picoplankton (< 3 mu m) and to identify links to environmental factors. Nitrogenase (nifH) genes were amplified from community DNA by nested PCR, followed by cloning and sequencing. Clone libraries from nine environmental samples collected from the central Baltic Sea (April-October 2003, 3 m depth) and a negative control yielded a total of 433 sequences with an average clone library coverage of 92%. The sequences fell within nifH Clusters I, II and III and formed 15 distinct groups (> 96% amino acid similarity). Most of the sequences (77%) fell into nifH Cluster I (cyanobacteria and alpha-, beta- and gamma-Proteobacteria). However, only 26 sequences were related to cyanobacteria (e. g. Pseudanabaena) and among these no unicellular phylotypes were found. Sequences clustering with alternative nitrogenases (anfH) and Archaea were found in one sample while sequences related to anaerobic phylotypes were found in six samples distributed throughout the season. The identified phylogenetic groups showed covariance with several environmental factors but no strong links could be established. This suggests a variable and complex regulation of diazotrophic groups within Baltic Sea picoplankton.

Place, publisher, year, edition, pages
2009. Vol. 1, 145-154 p.
National Category
Microbiology
Research subject
Natural Science, Microbiology
Identifiers
URN: urn:nbn:se:lnu:diva-11344DOI: 10.1111/j.1758-2229.2009.00021.xOAI: oai:DiVA.org:lnu-11344DiVA: diva2:409490
Available from: 2011-04-28 Created: 2011-04-08 Last updated: 2016-12-15Bibliographically approved

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Publisher's full texthttp://proxy.lnu.se/login?url=http://dx.doi.org/10.1111/j.1758-2229.2009.00021.x

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CiteExportLink to record
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