globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13356
论文题名:
Inhibition by ultraviolet and photosynthetically available radiation lowers model estimates of depth-integrated picophytoplankton photosynthesis: global predictions for Prochlorococcus and Synechococcus
作者: Neale P.J.; Thomas B.C.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:1
起始页码: 293
结束页码: 306
语种: 英语
英文关键词: biological weighting function ; photoinhibition ; photosynthesis–irradiance model ; picophytoplankton ; primary productivity ; UV effects
Scopus关键词: cyanobacterium ; marine ecosystem ; photoinhibition ; photosynthesis ; picoplankton ; prediction ; primary production ; ultraviolet radiation ; Pacific Ocean ; Pacific Ocean (East) ; Prochlorococcus ; Prokaryota ; Synechococcus
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 (Emax) 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. © 2016 John Wiley & Sons Ltd
资助项目: This research was supported by NASA grant NNX09AM85G to Brian Thomas, Patrick J. Neale, and Adrian Melott. The authors thank Alicia Pritchard and Ryan Ihnacik for laboratory assistance and Dirk Aurin, Cedric Fichot, and Pedro Flombaum for generously sharing their Matlab code. Computational time was provided by the high-performance computing environment (HiPACE) at Washburn University ; thanks to Steve Black for assistance with computing resources.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61226
Appears in Collections:影响、适应和脆弱性

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作者单位: Smithsonian Environmental Research Center, Edgewater, MD, United States; Department of Physics and Astronomy, Washburn University, 1700 SW College Ave, Topeka, KS, United States

Recommended Citation:
Neale P.J.,Thomas B.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,2017-01-01,23(1)
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