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Mar. Drugs 2012, 10(4), 775-792; doi:10.3390/md10040775

Diatom Derived Polyunsaturated Aldehydes Do Not Structure the Planktonic Microbial Community in a Mesocosm Study

1 Department for Bioorganic Analytics, Friedrich Schiller University Jena, 07743 Jena, Germany 2 Department of Biology, Division of Genetics and Physiology, University of Turku, FI-20014 Turku, Finland 3 Umeå Marine Sciences Centre, Umeå University, 91020 Hörnefors, Sweden 4 Department of Ecology and Environmental Sciences, Umeå University, 901 87 Umeå, Sweden 5 Department of Biological and Environmental Sciences, University of Gothenburg, SE-405 30 Göteborg, Sweden 6 Leibniz Institute for Natural Product Research and Infection Biology, Hans Knöll Institute (HKI), 07745 Jena, Germany These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 9 February 2012 / Revised: 15 March 2012 / Accepted: 17 March 2012 / Published: 28 March 2012
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Several marine and freshwater diatoms produce polyunsaturated aldehydes (PUA) in wound-activated processes. These metabolites are also released by intact diatom cells during algal blooms. Due to their activity in laboratory experiments, PUA are considered as potential mediators of diatom-bacteria interactions. Here, we tested the hypothesis that PUA mediate such processes in a close-to-field mesocosm experiment. Natural plankton communities enriched with Skeletonema marinoi strains that differ in their PUA production, a plankton control, and a plankton control supplemented with PUA at natural and elevated concentrations were observed. We monitored bacterial and viral abundance as well as bacterial community composition and did not observe any influence of PUA on these parameters even at elevated concentrations. We rather detected an alternation of the bacterial diversity over time and differences between the two S. marinoi strains, indicating unique dynamic bacterial communities in these algal blooms. These results suggest that factors other than PUA are of significance for interactions between diatoms and bacteria.
Keywords: mesocosm; plankton interactions; aldehydes; oxylipins mesocosm; plankton interactions; aldehydes; oxylipins
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Paul, C.; Reunamo, A.; Lindehoff, E.; Bergkvist, J.; Mausz, M.A.; Larsson, H.; Richter, H.; Wängberg, S.-Å.; Leskinen, P.; Båmstedt, U.; Pohnert, G. Diatom Derived Polyunsaturated Aldehydes Do Not Structure the Planktonic Microbial Community in a Mesocosm Study. Mar. Drugs 2012, 10, 775-792.

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