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Whales use distinct strategies to counteract solar ultraviolet radiation
Martinez-Levasseur, L.M.; Birch-Machin, M.A.; Bowman, A.; Gendron, D.; Weatherhead, E.; Knell, R.J.; Acevedo-Whitehouse, K. (2013). Whales use distinct strategies to counteract solar ultraviolet radiation. NPG Scientific Reports 3(2386): 6 pp. hdl.handle.net/10.1038/srep02386
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322, more
Peer reviewed article  

Available in Authors 

Keyword
    Marine
Author keywords
    Marine mammals Single-strand DNA breaks Animal physiology

Authors  Top 
  • Martinez-Levasseur, L.M.
  • Birch-Machin, M.A.
  • Bowman, A.
  • Gendron, D.
  • Weatherhead, E.
  • Knell, R.J.
  • Acevedo-Whitehouse, K.

Abstract
    A current threat to the marine ecosystem is the high level of solar ultraviolet radiation (UV). Large whales have recently been shown to suffer sun-induced skin damage from continuous UV exposure. Genotoxic consequences of such exposure remain unknown for these long-lived marine species, as does their capacity to counteract UV-induced insults. We show that UV exposure induces mitochondrial DNA damage in the skin of seasonally sympatric fin, sperm, and blue whales and that this damage accumulates with age. However, counteractive molecular mechanisms are markedly different between species. For example, sperm whales, a species that remains for long periods at the sea surface, activate genotoxic stress pathways in response to UV exposure whereas the paler blue whale relies on increased pigmentation as the season progresses. Our study also shows that whales can modulate their responses to fluctuating levels of UV, and that different evolutionary constraints may have shaped their response strategies.

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