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J Plankton Res. 2017 Jan;39(1):23-34. doi: 10.1093/plankt/fbw081. Epub 2016 Nov 26.

Allochthonous matter: an important factor shaping the phytoplankton community in the Baltic Sea.

Journal of plankton research

J Paczkowska, O F Rowe, L Schlüter, C Legrand, B Karlson, A Andersson

Affiliations

  1. Department of Ecology and Environmental Science, Umeå University, SE-901 87Umeå, Sweden.
  2. Umeå Marine Science Centre, SE-905 71Hörnefors, Sweden.
  3. Department of Food and Environmental Sciences, Division of Microbiology and Biotechnology, Viikki Biocenter 1, University of Helsinki, Helsinki, Finland.
  4. DHI, Environment and Toxicology, Agern Allé 5, 2970Hørsholmc, Denmark.
  5. Center of Ecology and Evolution in Microbial Model Systems, EEMiS, Department of Biology and Environmental Sciences, Linnaeus University, SE-391 82Kalmar, Sweden.
  6. Swedish Meteorological and Hydrological Institute, Oceanography, SE-426 71Västra Frölunda, Sweden.

PMID: 28566797 PMCID: PMC5444108 DOI: 10.1093/plankt/fbw081

Abstract

It is well-known that nutrients shape phytoplankton communities in marine systems, but in coastal waters allochthonous dissolved organic matter (ADOM) may also be of central importance. We studied how humic substances (proxy of ADOM) and other variables influenced the nutritional strategies, size structure and pigment content of the phytoplankton community along a south-north gradient in the Baltic Sea. During the summer, the proportion of mixotrophs increased gradually from the phosphorus-rich south to the ADOM-rich north, probably due to ADOM-fueled microbes. The opposite trend was observed for autotrophs. The chlorophyll

Keywords: allochthonous dissolved organic matter; humic substances; nitrogen; phosphorus; phytoplankton; structuring factors

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