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In situ study of relative electron transport rates (ETR) in the marine macroalga Fucus vesiculosus from the Baltic Sea at different depths and times of the year.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
2008 (English)In: Journal of Applied Phycology, ISSN 0921-8971, Vol. 20, no 5, 751-756 p.Article in journal (Refereed) Published
Abstract [en]

The brown alga Fucus vesiculous is one of the few marine species in the Baltic Sea. F. vesiculosus shows high morphological and physiological variability as a response to its environmental conditions. The salinity in the Baltic Sea is 4-5 psu in comparison to 35 psu in the Atlantic. Photosynthesis of algae is usually measured after collection and transportation to constant culture conditions. However, in this study the relative photosynthetic electron transport rate (rETR), calculated from chl a fluorescence parameters were compared for algae from 1 and 4 m depths by SCUBA divers. Measurements of light response curves from the same individuals of F. vesiculosus at different depths and times of the year have to our knowledge never been made before. Measurements were performed at four different occasions during the spring (February 25, April 3 and 29 and May 26 in 2005) in the Baltic Sea, using rapid light curves (RLCs) generated with a Diving PAM. In addition, samples were collected for photoinhibition studies in the laboratory. The light response curves obtained in situ at 1 and 4 m depths for F. vesiculosus showed lower values of light saturation with depth. When algae from 1 and 4 m depths were exposed to high irradiances of PAR (1400 µmol photons m-2 s-1), algae from 1 m depth showed a higher degree of photoinhibition in comparison to algae from the 4 m depth.

Place, publisher, year, edition, pages
2008. Vol. 20, no 5, 751-756 p.
Keyword [en]
Diving PAM, fluorescence, photoinhibition, photosynthesis.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:miun:diva-6528DOI: 10.1007/s10811-007-9288-yISI: 000261969300038 Scopus ID: 2-s2.0-58149250905Local ID: 5391OAI: oai:DiVA.org:miun-6528DiVA: diva2:31567
Available from: 2008-12-07 Created: 2008-12-07 Last updated: 2009-03-19Bibliographically approved

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Ekelund, Nils G. A.Nygård, Charlotta AGylle, Maria
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CiteExportLink to record
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Citation style
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