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JPR Advance Access originally published online on December 26, 2008
Journal of Plankton Research 2009 31(4):349-357; doi:10.1093/plankt/fbn123
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© 2008 The Author(s)
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Photosynthetic and growth response of freshwater picocyanobacteria are strain-specific and sensitive to photoacclimation

Michael Moser1, Cristana Callieri2 and Thomas Weisse1,*

1 Institute for Limnology of the Austrian Academy of Sciences, Mondseestr. 9, A-5310 Mondsee, Austria 2 CNR-ISE, Institute of Ecosystem Study, Largo Tonolli 50, 28922 Pallanza, Italy

* CORRESPONDING AUTHOR: thomas.weisse{at}oeaw.ac.at

Received on April 23, 2008; accepted on November 27, 2008


  Abstract

We investigated the effect of different light conditions on primary production and growth rates of three closely related freshwater picocyanobacterial strains from three different ribotypes in laboratory cultures. The primary goal was to test whether not only different pigment types (PC-rich versus PE-rich) but also other physiological characteristics suggested by different phylogenetic positions could affect growth and photosynthetic rates of picocyanobacteria. Secondly, we tested whether photacclimation is strain specific. Experiments were conducted over light intensities ranging from 6 to 1500 µmol photons m–2 s–1 with cultures that were acclimated to low (10 µmol photons m–2 s–1) and moderate (100 µmol photons m–2 s–1) irradiance. The PE-rich strain was sensitive to high light conditions and reached highest photosynthesis and growth rates at low light intensities. The relative effect of photoacclimation was different between the two PC-rich strains, with one strain showing only moderate changes in growth rates in response to the light level used during the acclimation period. Overall, growth rates differed widely in response to light intensity and photoacclimation. Photoacclimation significantly affected both primary production and growth rates of all three strains investigated. We conclude that strain-specific photoacclimation adds to the niche partitioning among closely related freshwater picocyanobacteria.

Corresponding editor: William Li


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