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- Title
UV-induced DNA damage in Cyclops abyssorum tatricus populations from clear and turbid alpine lakes.
- Authors
Tartarotti, Barbara; Trattner, Florian; Sommaruga, Ruben; Saul, Nadine; Chakrabarti, Shumon; Steinberg, Christian E. W.
- Abstract
Zooplankton from clear alpine lakes thrive under high levels of solar UV radiation (UVR), but in glacially turbid ones they are more protected from this damaging radiation. Here, we present results from experiments done with Cyclops abyssorum tatricus to assess UV-induced DNA damage and repair processes using the comet assay. Copepods were collected from three alpine lakes of differing UV transparency ranging from clear to glacially turbid, and exposed to artificial UVR. In addition, photoprotection levels [mycosporine-like amino acids (MAAs) and lipophilic antioxidant capacity] were estimated in the test populations. Similar UV-induced DNA damage levels were observed among the copepods from all lakes, but background DNA damage (time zero and dark controls) was lowest in the copepods from the glacially turbid lake, resulting in a higher relative DNA damage accumulation. Most DNA strand breaks were repaired after recovery in the dark. Low MAA concentrations were found in the copepods from the glacially turbid lake, while the highest levels were observed in the population from the most UV transparent lake. However, the highest lipophilic antioxidant capacities were measured in the copepods from the lake with intermediate UV transparency. Photoprotection and the ability to repair DNA damage, and consequently reducing UV-induced damage, are part of the response mechanisms in zooplankton to changes in water transparency caused by glacier retreat.
- Subjects
COPEPODA; PHYSIOLOGICAL effects of ultraviolet radiation; GEL electrophoresis; DNA repair; DNA damage; MYCOSPORINE-like amino acids; THERAPEUTICS
- Publication
Journal of Plankton Research, 2014, Vol 36, Issue 2, p557
- ISSN
0142-7873
- Publication type
Article
- DOI
10.1093/plankt/fbt109