Transient sediment load on blades of Arctic Saccharina latissima can mitigate UV radiation effect on photosynthesis |
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Authors: | Michael Y. Roleda Dirk Dethleff Christian Wiencke |
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Affiliation: | (1) Institute for Polar Ecology, University of Kiel, Wischhofstrasse 1-3, Building 12, 24148 Kiel, Germany;(2) Section Seaweed Biology, Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany |
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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. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Ablation-derived siltation Arctic fjord system Climate change F v/F m Optimum quantum yield |
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