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Effectiveness of Photoprotective Strategies in Three Mixotrophic Planktonic Ciliate Species

1
Research Department for Limnology, Mondsee, Leopold-Franzens-University of Innsbruck, A-5310 Mondsee, Austria
2
Department of Ecology, Leopold-Franzens-University of Innsbruck, A-6020 Innsbruck, Austria
*
Author to whom correspondence should be addressed.
Diversity 2020, 12(6), 252; https://doi.org/10.3390/d12060252
Received: 15 May 2020 / Revised: 10 June 2020 / Accepted: 17 June 2020 / Published: 20 June 2020
(This article belongs to the Special Issue Biodiversity of Ciliates and their Symbionts)
Mixotrophic ciliate assemblages often prevail in summer in the surface layers of lakes. During this time, they are potentially exposed to damaging levels of incident solar ultraviolet radiation (UVR) and need efficient photoprotective mechanisms to minimize the damage. Herein, we tested the algal-bearing species of Pelagodileptus trachelioides, Stokesia vernalis, and Vorticella chlorellata for how they handled stress under exposure to the artificial sunlight spectrum (i.e., UV treatment), just photosynthetically active radiation (PAR), or in the dark (i.e., control). In addition to measurements of their survival, changes in behavior, shape, and whether dark or photoenzymatic repair (PER) mechanisms are present, we measured the concentration of UV-absorbing compounds (i.e., mycosporine-like amino acids). In contrast to the response in the PAR and dark treatments, sublethal effects were observed in all species when exposed to UVR. A wavelength-specific test for P. trachelioides revealed that UV-B was especially lethal. These results suggest that the photoprotective mechanisms found in these ciliates are not sufficient to allow for their survival directly at the surface and that, accordingly, they need to shift their position further down in the water column. View Full-Text
Keywords: algal-ciliate symbiosis; mycosporine-like amino acids; Pelagodileptus trachelioides; planktonic freshwater ciliates; Stokesia vernalis; Vorticella chlorellata algal-ciliate symbiosis; mycosporine-like amino acids; Pelagodileptus trachelioides; planktonic freshwater ciliates; Stokesia vernalis; Vorticella chlorellata
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Sonntag, B.; Sommaruga, R. Effectiveness of Photoprotective Strategies in Three Mixotrophic Planktonic Ciliate Species. Diversity 2020, 12, 252.

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