Ultraviolet absorbing compounds provide a rapid response mechanism for UV protection in some reef fish

Braun, C., Reef, R. and Siebeck, U. E. (2016) Ultraviolet absorbing compounds provide a rapid response mechanism for UV protection in some reef fish. Journal of Photochemistry and Photobiology B: Biology, 160 400-407. doi:10.1016/j.jphotobiol.2016.04.020


Author Braun, C.
Reef, R.
Siebeck, U. E.
Title Ultraviolet absorbing compounds provide a rapid response mechanism for UV protection in some reef fish
Journal name Journal of Photochemistry and Photobiology B: Biology   Check publisher's open access policy
ISSN 1873-2682
1011-1344
Publication date 2016-07
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.jphotobiol.2016.04.020
Open Access Status Not Open Access
Volume 160
Start page 400
End page 407
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Collection year 2017
Language eng
Formatted abstract
The external mucus surface of reef fish contains ultraviolet absorbing compounds (UVAC), most prominently Mycosporine-like Amino Acids (MAAs). MAAs in the external mucus of reef fish are thought to act as sunscreens by preventing the damaging effects of ultraviolet radiation (UVR), however, direct evidence for their protective role has been missing. We tested the protective function of UVAC's by exposing fish with naturally low, Pomacentrus amboinensis, and high, Thalassoma lunare, mucus absorption properties to a high dose of UVR (UVB: 13.4 W * m-2, UVA: 6.1 W * m-2) and measuring the resulting DNA damage in the form of cyclobutane pyrimidine dimers (CPDs). For both species, the amount of UV induced DNA damage sustained following the exposure to a 1 h pulse of high UVR was negatively correlated with mucus absorbance, a proxy for MAA concentration. Furthermore, a rapid and significant increase in UVAC concentration was observed in P. amboinensis following UV exposure, directly after capture and after ten days in captivity. No such increase was observed in T. lunare, which maintained relatively high levels of UV absorbance at all times. P. amboinensis, in contrast to T. lunare, uses UV communication and thus must maintain UV transparent mucus to be able to display its UV patterns. The ability to rapidly alter the transparency of mucus could be an important adaptation in the trade off between protection from harmful UVR and UV communication.
Keyword DNA damage
Mycosporine-like amino acids
Pomacentrus amboinensis
Reef fish
Sunscreens
Ultraviolet absorbing compounds
UV radiation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Biomedical Sciences Publications
 
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