IHB OpenIR  > 期刊论文
Variability of UVR effects on photosynthesis of summer phytoplankton assemblages from a tropical coastal area of the South China Sea
Gao, Kunshan; Li, Gang; Helbling, E. Walter; Villafane, Virginia E.
2007-07-01
Source PublicationPHOTOCHEMISTRY AND PHOTOBIOLOGY
ISSN0031-8655
Volume83Issue:4Pages:802-809
AbstractFrom June to September 2005, we carried out experiments to determine the ultraviolet radiation (UVR) -induced photoinhibition of summer phytoplankton assemblages from a coastal site of the South China Sea. Variability in taxonomic composition was determined throughout the summer, with a peak chlorophyll a (chl a similar to 20 mu g chl a L-1) dominated by the diatom Skeletonema costatum that was detected early in the study period; the rest of the time samples were characterized by monads and flagellates, with low chi a values (1-5 chl a mu g L-1). Surface water samples were placed in quartz tubes, inoculated with radiocarbon and exposed to solar radiation for 2-3 h to determine photosynthetic rates under three quality radiation treatments (i.e. PAB, 280-700 nm; PA, 320-700 nm and P, 400-700 nm) using different filters and under seven levels of ambient irradiance using neutral density screens (P vs E curves). UVR inhibition of samples exposed to maximum irradiance (i.e. at the surface) varied from -12.2% to 50%, while the daytime-integrated UVR-related photoinhibition in surface seawater varied from -62% to 7%. The effects of UVR on the photosynthetic parameters p(max)(B) and E-k were also variable, but UV-B accounted for most of the observed variability. During sunny days, photosynthesis of microplankton ( > 20 mu m) and piconanoplankton ( < 20 mu m) were significantly inhibited by UVR (mostly by UV-B). However, during cloudy days, while piconanoplankton cells were still inhibited by UVR, microplankton cells used UVR (mostly UV-A) as the source of energy for photosynthesis, resulting in higher carbon fixation in samples exposed to UVR than the ones exposed only to photosynthetically active radiation (PAR). Our results indicate that size structure and cloudiness clearly condition the overall impact of UVR on phytoplankton photosynthesis in this tropical site of South China. In addition, model predictions for this area considering only PAR for primary production might have underestimated carbon fixation due to UVR contribution.
SubtypeArticle
DOI10.1111/j.1751-1097.2007.00154.x
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI ; ISTP
Language英语
WOS Research AreaBiochemistry & Molecular Biology ; Biophysics
WOS SubjectBiochemistry & Molecular Biology ; Biophysics
WOS IDWOS:000248537200005
WOS KeywordSOLAR ULTRAVIOLET-RADIATION ; TEMPERATE MARINE-PHYTOPLANKTON ; B RADIATION ; ARGENTINA ; PATAGONIA ; DNA ; SENSITIVITY ; ESTUARY ; DIATOMS ; IMPACT
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/342005/27231
Collection期刊论文
Affiliation1.Shantou Univ, Inst Marine Biol, Shantou, Guangdong, Peoples R China
2.Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China
3.Chinese Acad Sci, State Key Lab Freshwater Ecol & Biotechnol, Inst Hydrobiol, Wuhan, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Gao, Kunshan,Li, Gang,Helbling, E. Walter,et al. Variability of UVR effects on photosynthesis of summer phytoplankton assemblages from a tropical coastal area of the South China Sea[J]. PHOTOCHEMISTRY AND PHOTOBIOLOGY,2007,83(4):802-809.
APA Gao, Kunshan,Li, Gang,Helbling, E. Walter,&Villafane, Virginia E..(2007).Variability of UVR effects on photosynthesis of summer phytoplankton assemblages from a tropical coastal area of the South China Sea.PHOTOCHEMISTRY AND PHOTOBIOLOGY,83(4),802-809.
MLA Gao, Kunshan,et al."Variability of UVR effects on photosynthesis of summer phytoplankton assemblages from a tropical coastal area of the South China Sea".PHOTOCHEMISTRY AND PHOTOBIOLOGY 83.4(2007):802-809.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Gao, Kunshan]'s Articles
[Li, Gang]'s Articles
[Helbling, E. Walter]'s Articles
Baidu academic
Similar articles in Baidu academic
[Gao, Kunshan]'s Articles
[Li, Gang]'s Articles
[Helbling, E. Walter]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Gao, Kunshan]'s Articles
[Li, Gang]'s Articles
[Helbling, E. Walter]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.