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Transient sediment load on blades of Arctic Saccharina latissima can mitigate UV radiation effect on photosynthesis

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Abstract

We studied the short-term impact of sediment load on the photosynthetic performance of Saccharina latissima sporophytes exposed to ultraviolet radiation (UVR). The algae were collected from different sediment-influenced environments in Svalbard in August 2007. Initial optimum quantum yield (F v/F m) of sediment-covered sporophytes was significantly higher compared to sediment-free sporophytes. Experimental sediment coating on blade discs had a photoprotective function by screening out 92% of the weighted UV-B (UVery) treatment. No UVR-induced photoinhibition was observed in sediment-coated blade discs while sediment removal caused a reduction in F v/F m not only after 12-h UVR exposure but also after 6-h recovery in low white light compared to the initial value. Thus, sediment coating has a short-term functional significance in mitigating the negative effect of UVR on photosynthesis of an important kelp species and set a baseline for further studies.

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Acknowledgments

We thank the diving group of AWI for collecting experimental material. This study is supported by the AWI and performed at the International Arctic Environmental Research and Monitoring Facility at Ny Ålesund, Svalbard.

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Authors and Affiliations

  1. Institute for Polar Ecology, University of Kiel, Wischhofstrasse 1-3, Building 12, 24148, Kiel, Germany

    Michael Y. Roleda & Dirk Dethleff

  2. Section Seaweed Biology, Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570, Bremerhaven, Germany

    Christian Wiencke

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  1. Michael Y. Roleda
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  2. Dirk Dethleff
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  3. Christian Wiencke
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Correspondence to Michael Y. Roleda.

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Roleda, M.Y., Dethleff, D. & Wiencke, C. Transient sediment load on blades of Arctic Saccharina latissima can mitigate UV radiation effect on photosynthesis. Polar Biol 31, 765–769 (2008). https://doi.org/10.1007/s00300-008-0434-z

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  • DOI: https://doi.org/10.1007/s00300-008-0434-z

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