Short Note

Polar Biology

, Volume 31, Issue 6, pp 765-769

First online:

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

  • Michael Y. RoledaAffiliated withInstitute for Polar Ecology, University of Kiel Email author 
  • , Dirk DethleffAffiliated withInstitute for Polar Ecology, University of Kiel
  • , Christian WienckeAffiliated withSection Seaweed Biology, Alfred Wegener Institute for Polar and Marine Research

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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.


Ablation-derived siltation Arctic fjord system Climate change Fv/Fm Optimum quantum yield