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

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Paczkowska , J , Rowe , O , Schluster , L , Legrand , C , Karlson , B & Andersson , A 2017 , ' Allochthonous matter : an important factor shaping the phytoplankton community in the Baltic Sea ' , Journal of Plankton Research , vol. 39 , no. 1 , pp. 23-34 . https://doi.org/10.1093/plankt/fbw081

Title: Allochthonous matter : an important factor shaping the phytoplankton community in the Baltic Sea
Author: Paczkowska, J.; Rowe, Owen; Schluster, L.; Legrand, C.; Karlson, B.; Andersson, A.
Contributor: University of Helsinki, Department of Food and Nutrition
Date: 2017-01
Language: eng
Number of pages: 12
Belongs to series: Journal of Plankton Research
ISSN: 0142-7873
URI: http://hdl.handle.net/10138/232067
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 a (Chl a): carbon (C) ratio increased while the levels of photoprotective pigments decreased from south to north, indicating adaptation to the darker humic-rich water in the north. Picocyanobacteria dominated in phosphorusrich areas while nanoplankton increased in ADOM- rich areas. During the winter-spring the phytoplankton biomass and concentrations of photoprotective pigments were low, and no trends with respect to autotrophs and mixotrophs were observed. Microplankton was the dominant size group in the entire study area. We conclude that changes in the size structure of the phytoplankton community, the Chl a: C ratio and the concentrations of photoprotective pigments are indicative of changes in ADOM, a factor of particular importance in a changing climate.
Subject: phytoplankton
allochthonous dissolved organic matter
humic substances
nitrogen
phosphorus
structuring factors
DISSOLVED ORGANIC-CARBON
BACTERIOPLANKTON PRODUCTION
CYANOBACTERIAL BLOOMS
NUTRIENT LIMITATION
SEASONAL DYNAMICS
CLIMATE-CHANGE
SIZE STRUCTURE
HPLC-ANALYSIS
CELL-SIZE
PIGMENTS
1183 Plant biology, microbiology, virology
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