Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13356 |
Inhibition by ultraviolet and photosynthetically available radiation lowers model estimates of depth-integrated picophytoplankton photosynthesis: global predictions for Prochlorococcus and Synechococcus | |
Neale, Patrick J.1; Thomas, Brian C.2 | |
2017 | |
发表期刊 | GLOBAL CHANGE BIOLOGY
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2017 |
卷号 | 23期号:1 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Phytoplankton photosynthesis is often inhibited by ultraviolet (UV) and intense photosynthetically available radiation (PAR), but the effects on ocean productivity have received little consideration aside from polar areas subject to periodic enhanced UV-B due to depletion of stratospheric ozone. A more comprehensive assessment is important for understanding the contribution of phytoplankton production to the global carbon budget, present and future. Here, we consider responses in the temperate and tropical mid-ocean regions typically dominated by picophytoplankton including the prokaryotic lineages, Prochlorococcus and Synechococcus. Spectral models of photosynthetic response for each lineage were constructed using model strains cultured at different growth irradiances and temperatures. In the model, inhibition becomes more severe once exposure exceeds a threshold (E-max) related to repair capacity. Model parameters are presented for Prochlorococcus adding to those previously presented for Synechococcus. The models were applied to estimate midday, water column photosynthesis based on an atmospheric model of spectral radiation, satellite-derived spectral water transparency and temperature. Based on a global survey of inhibitory exposure severity, a full-latitude section of the mid-Pacific and near-equatorial region of the east Pacific were identified as representative regions for prediction of responses over the entire water column. Comparing predictions integrated over the water column including versus excluding inhibition, production was 7-28% lower due to inhibition depending on strain and site conditions. Inhibition was consistently greater for Prochlorococcus compared to two strains of Synechococcus. Considering only the surface mixed layer, production was inhibited 7-73%. On average, including inhibition lowered estimates of midday productivity around 20% for the modeled region of the Pacific with UV accounting for two-thirds of the reduction. In contrast, most other productivity models either ignore inhibition or only include PAR inhibition. Incorporation of Emax model responses into an existing spectral model of depth-integrated, daily production will enable efficient global predictions of picophytoplankton productivity including inhibition. |
英文关键词 | biological weighting function photoinhibition photosynthesis-irradiance model picophytoplankton primary productivity UV effects |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000390218300025 |
WOS关键词 | MARINE CYANOBACTERIUM PROCHLOROCOCCUS ; ANTARCTIC PHYTOPLANKTON ; PRIMARY PRODUCTIVITY ; OZONE DEPLETION ; SOUTHERN-OCEAN ; UV-RADIATION ; SOLAR UVR ; TEMPERATURE ; GROWTH ; EXPOSURE |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/16819 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Smithsonian Environm Res Ctr, POB 28, Edgewater, MD 21037 USA; 2.Washburn Univ, Dept Phys & Astron, 1700 SW Coll Ave, Topeka, KS 66604 USA |
推荐引用方式 GB/T 7714 | Neale, Patrick J.,Thomas, Brian C.. Inhibition by ultraviolet and photosynthetically available radiation lowers model estimates of depth-integrated picophytoplankton photosynthesis: global predictions for Prochlorococcus and Synechococcus[J]. GLOBAL CHANGE BIOLOGY,2017,23(1). |
APA | Neale, Patrick J.,&Thomas, Brian C..(2017).Inhibition by ultraviolet and photosynthetically available radiation lowers model estimates of depth-integrated picophytoplankton photosynthesis: global predictions for Prochlorococcus and Synechococcus.GLOBAL CHANGE BIOLOGY,23(1). |
MLA | Neale, Patrick J.,et al."Inhibition by ultraviolet and photosynthetically available radiation lowers model estimates of depth-integrated picophytoplankton photosynthesis: global predictions for Prochlorococcus and Synechococcus".GLOBAL CHANGE BIOLOGY 23.1(2017). |
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