Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
UV radiation effects on pigments, photosynthetic efficiency and DNA of an Antarctic marine benthic diatom community
Univ Gothenburg, S-40530 Gothenburg, Sweden..
Univ Kiel, Inst Polar Ecol, D-24148 Kiel, Germany..
Alfred Wegener Inst Polar & Marine Res, D-27570 Bremerhaven, Germany..
Alfred Wegener Inst Polar & Marine Res, D-27570 Bremerhaven, Germany..
Responsible organisation
2008 (English)In: Aquatic Biology, ISSN 1864-7782, E-ISSN 1864-7790, Vol. 3, no 2, 167-177 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

The impact of ultraviolet radiation (UVR) on a semi-natural, soft-bottom diatom community from Potter Cove, King Georg Island, Antarctica, was investigated. The objective was to estimate the impact of UV-B (280 to 320 nm) and UV-A (320 to 400 nm) on photosynthetic efficiency, pigments, DNA damage and repair. The diatom community was exposed to different doses of radiation treatments: PAR + UV-A + UV-B (PAB), PAR + UV-A (PA) and PAR (P). The most frequently observed species were Pleurosigma obscurum and Gyrosigma fasciola. Within the 0.7 mm substrate, UV radiation significantly reduced the Photosystem II (PS II) maximum efficiency (F-v/F-m). Complete recovery was observed after 6 h post-cultivation under dim white light. The accumulation of diatoxanthin increased with exposure time for the P and PA treatments, but not for the PAB treatment, indicating a UV-B-related blocking of the de-epoxidation process within the xanthophyll cycling process. The ratio of diatoxanthin:(diatoxanthin+diadinoxanthin) decreased again to initial values after 24 h of recovery. The amount of DNA damage, measured as accumulation of cyclobutane pyrimidine dimers (CPDs), was minimal and increased with increasing UV-B dose, but DNA lesions were completely repaired within 24 h under dim white light. Regardless of possible avoidance strategies, e.g. vertical migration, negative UV treatment effects were observed. However, these effects were transient, facilitated by the dynamic recovery of photoinhibition and an efficient DNA damage repair mechanism. Although results from laboratory experiments using artificial radiation can only be extrapolated to field conditions with great caution, we conclude that Antarctic marine benthic diatoms inoculated into a semi-natural habitat are resilient to unnaturally high UVR.

Place, publisher, year, edition, pages
2008. Vol. 3, no 2, 167-177 p.
Keyword [en]
Benthic diatoms, UV radiation, UV-B radiation, Xanthophyll pigments, F-v/F-m, DNA damage, Microphytobenthos, P-E curve
Research subject
SWEDARP; SWEDARP 2004/05, UV-strålningens effekter på bentiska primärproducenter i Antarktis
Identifiers
URN: urn:nbn:se:polar:diva-2562DOI: 10.3354/ab00076ISI: 000260231800008OAI: oai:DiVA.org:polar-2562DiVA: diva2:883113
Available from: 2015-12-16 Created: 2015-12-16 Last updated: 2015-12-16

Open Access in DiVA

No full text

Other links

Publisher's full text
In the same journal
Aquatic Biology

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 10 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf