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Vertical mixing within the epilimnion modulates UVR-induced photoinhibition in tropical freshwater phytoplankton from southern China
Villafane, Virginia E.; Gao, Kunshan; Li, Ping; Li, Gang; Helbling, E. Walter; Villafane, VE, Estac Fotobiol, Playa Union,Casilla Correo 15, RA-9103 Rawson, Chubut, Argentina
2007-07-01
Source PublicationFRESHWATER BIOLOGY
ISSN0046-5070
Volume52Issue:7Pages:1260-1270
Abstract1. The importance of vertical mixing in modulating the impact of UVR on phytoplankton photosynthesis was assessed in a tropical, shallow lake in southern China from late winter to mid-spring of 2005. 2. Daily cycles of fluorescence measurements (i.e. photosynthetic quantum yield, Y) were performed on both 'static' and in situ samples. Static samples were of surface water incubated at the surface of the lake under three radiation treatments - PAB (PAR + UVR, 280-700 nm), PA (PAR + UV-A, 320-700 nm) and P (PAR, 400-700 nm). In situ samples were collected every hour at three different depths - 0, 0.5 and 1 m. 3. The general daily pattern was of a significant decrease in Y from early morning towards noon, with partial recovery in the afternoon. Samples incubated under static conditions always had lower Y than those under in situ conditions at the same time of the day. 4. Under stratified conditions, no overall impact of UVR impact could be detected in situ when compared with the static samples. Further rapid vertical mixing not only counteracted the impact of UVR but also stimulated photosynthetic efficiency. 5. Based on these measurements of fluorescence, the mixing speed of cells moving within the epilimnion was estimated to range between 0.53 and 6.5 cm min(-1). 6. These data show that mixing is very important in modulating the photosynthetic response of phytoplankton exposed to natural radiation and, hence, strongly conditions the overall impact of UVR on aquatic ecosystems.; 1. The importance of vertical mixing in modulating the impact of UVR on phytoplankton photosynthesis was assessed in a tropical, shallow lake in southern China from late winter to mid-spring of 2005.
SubtypeArticle
KeywordMixing Photosynthesis Photosynthetically Available Radiation Phytoplankton Ultraviolet Radiation
DepartmentEstac Fotobiol, RA-9103 Rawson, Chubut, Argentina; Consejo Nacl Invest Cient & Tecn, RA-9103 Rawson, Chubut, Argentina; Shantou Univ, Marine Biol Inst, Guangdong 515063, Peoples R China; Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China
Subject AreaMarine & Freshwater Biology
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
Language英语
WOS Research AreaMarine & Freshwater Biology
WOS SubjectMarine & Freshwater Biology
WOS IDWOS:000247127200007
WOS KeywordSOLAR ULTRAVIOLET-RADIATION ; TEMPERATE MARINE-PHYTOPLANKTON ; COASTAL PHYTOPLANKTON ; ARTHROSPIRA-PLATENSIS ; CHLOROPHYLL-A ; PHOTOSYNTHESIS ; ARGENTINA ; EXPOSURE ; IMPACT ; FLUORESCENCE
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Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ihb.ac.cn/handle/152342/8564
Collection期刊论文
Corresponding AuthorVillafane, VE, Estac Fotobiol, Playa Union,Casilla Correo 15, RA-9103 Rawson, Chubut, Argentina
Affiliation1.Estac Fotobiol, RA-9103 Rawson, Chubut, Argentina
2.Consejo Nacl Invest Cient & Tecn, RA-9103 Rawson, Chubut, Argentina
3.Shantou Univ, Marine Biol Inst, Guangdong 515063, Peoples R China
4.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Hubei, Peoples R China
Recommended Citation
GB/T 7714
Villafane, Virginia E.,Gao, Kunshan,Li, Ping,et al. Vertical mixing within the epilimnion modulates UVR-induced photoinhibition in tropical freshwater phytoplankton from southern China[J]. FRESHWATER BIOLOGY,2007,52(7):1260-1270.
APA Villafane, Virginia E.,Gao, Kunshan,Li, Ping,Li, Gang,Helbling, E. Walter,&Villafane, VE, Estac Fotobiol, Playa Union,Casilla Correo 15, RA-9103 Rawson, Chubut, Argentina.(2007).Vertical mixing within the epilimnion modulates UVR-induced photoinhibition in tropical freshwater phytoplankton from southern China.FRESHWATER BIOLOGY,52(7),1260-1270.
MLA Villafane, Virginia E.,et al."Vertical mixing within the epilimnion modulates UVR-induced photoinhibition in tropical freshwater phytoplankton from southern China".FRESHWATER BIOLOGY 52.7(2007):1260-1270.
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