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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Martinez-Levasseur LM,Birch-Machin MA,Bowman A,Gendron D,Weatherhead E,Knell RJ,Acevedo-Whitehouse Kdoi
10.1038/srep02386subject
Has Abstractpub_date
2013-01-01 00:00:00pages
2386issn
2045-2322pii
srep02386journal_volume
3pub_type
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