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Applied and Environmental Microbiology, April 2005, p. 2154-2157, Vol. 71, No. 4
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.4.2154-2157.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Differential Sunlight Sensitivity of Picophytoplankton from Surface Mediterranean Coastal Waters

Ruben Sommaruga,1* Julia S. Hofer,1 Laura Alonso-Sáez,2 and Josep M. Gasol2

Laboratory of Aquatic Photobiology and Plankton Ecology, Institute of Zoology and Limnology, University of Innsbruck, Innsbruck, Austria,1 Institut de Ciències del Mar, CMIMA, CSIC, Barcelona, Spain2

Received 13 September 2004/ Accepted 7 November 2004

We tested the sensitivity of coastal picophytoplankton exposed to natural sunlight in short-term experiments. Cell abundance and cell-specific chlorophyll fluorescence were significantly reduced in Prochlorococcus spp. but not in Synechococcus, whereas picoeukaryotes had an intermediate response. These results are the first direct evidence of a differential sensitivity to sunlight of these ubiquitous marine members of unicellular phytoplankton.

* Corresponding author. Mailing address: Laboratory of Aquatic Photobiology and Plankton Ecology, Institute of Zoology and Limnology, University of Innsbruck, Technikerstr. 25, 6020 Innsbruck, Austria. Phone: 43 5125076121. Fax: 43 5125072930. E-mail: ruben.sommaruga{at}uibk.ac.at.

Applied and Environmental Microbiology, April 2005, p. 2154-2157, Vol. 71, No. 4
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.4.2154-2157.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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