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JPR Advance Access originally published online on March 30, 2004
Journal of Plankton Research 2004 26(7):779-798; doi:10.1093/plankt/fbh070
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Journal of Plankton Research Vol. 26 No. 7 © Oxford University Press 2004; all rights reserved

Species-specific differences in phytoplankton responses to N and P enrichments and the N:P ratio in the Archipelago Sea, northern Baltic Sea

A. Lagus1,*, J. Suomela2, G. Weithoff1,3, K. Heikkilä1, H. Helminen2 and J. Sipura1

1 Section of Ecology, Department of Biology, University of Turku, Fin-20014 Turku, 2 SW Finland Regional Environment Centre, PL 47, Fin-20801 Turku, Finland and 3 University of Potsdam, Institute for Biochemistry and Biology, Department of Ecology and Ecosystem Modeling, Maulbeerallee 2, 14469 Potsdam, Germany

* Corresponding Author: annika.lagus{at}utu.fi

A nutrient enrichment experiment was conducted in order to study the role of nitrogen (N), phosphorus (P) and the N:P ratio on the early summer phytoplankton community in the Archipelago Sea, northern Baltic Sea. The phytoplankton community was, in terms of chlorophyll a and total biomass, primarily N-limited, but the individual species varied in their responses to the nutrient supply. The recorded overall N limitation was due to fast growth responses of a few N-limited species such as the diatom Chaetoceros wighamii (Brightwell) and the mixotrophic chrysophyte Uroglena sp. Another dominating diatom, Skeletonema costatum (Greville) Cleve was most clearly P-limited. The N:P ratio had the strongest effect on Uroglena sp., which grew exponentially in the enrichments with a high N:P ratio. This can be explained by the ability of the species to feed on P-rich bacteria, which gives it a competitive advantage in P-limited conditions. The species-specific differences in the responses to the nutrient enrichments can generally be explained by differences in the species physiology and they were consistent with the theory of resource competition.


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