globalchange  > 过去全球变化的重建
DOI: 10.1371/journal.pone.0132806
论文题名:
Predicting Effects of Ocean Acidification and Warming on Algae Lacking Carbon Concentrating Mechanisms
作者: Janet E. Kübler; Steven R. Dudgeon
刊名: PLOS ONE
ISSN: 1932-6203
出版年: 2015
发表日期: 2015-7-14
卷: 10, 期:7
语种: 英语
英文关键词: Photosynthesis ; Carbon dioxide ; Algae ; Sea water ; Photons ; Light ; Marine ecology ; Climate change
英文摘要: Seaweeds that lack carbon-concentrating mechanisms are potentially inorganic carbon-limited under current air equilibrium conditions. To estimate effects of increased atmospheric carbon dioxide concentration and ocean acidification on photosynthetic rates, we modeled rates of photosynthesis in response to pCO2, temperature, and their interaction under limiting and saturating photon flux densities. We synthesized the available data for photosynthetic responses of red seaweeds lacking carbon-concentrating mechanisms to light and temperature. The model was parameterized with published data and known carbonate system dynamics. The model predicts that direction and magnitude of response to pCO2 and temperature, depend on photon flux density. At sub-saturating light intensities, photosynthetic rates are predicted to be low and respond positively to increasing pCO2, and negatively to increasing temperature. Consequently, pCO2 and temperature are predicted to interact antagonistically to influence photosynthetic rates at low PFD. The model predicts that pCO2 will have a much larger effect than temperature at sub-saturating light intensities. However, photosynthetic rates under low light will not increase proportionately as pCO2 in seawater continues to rise. In the range of light saturation (Ik), both CO2 and temperature have positive effects on photosynthetic rate and correspondingly strong predicted synergistic effects. At saturating light intensities, the response of photosynthetic rates to increasing pCO2 approaches linearity, but the model also predicts increased importance of thermal over pCO2 effects, with effects acting additively. Increasing boundary layer thickness decreased the effect of added pCO2 and, for very thick boundary layers, overwhelmed the effect of temperature on photosynthetic rates. The maximum photosynthetic rates of strictly CO2-using algae are low, so even large percentage increases in rates with climate change will not contribute much to changing primary production in the habitats where they commonly live.
URL: http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0132806&type=printable
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/20853
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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作者单位: Department of Biology, California State University, Northridge, California, United States of America;Department of Biology, California State University, Northridge, California, United States of America

Recommended Citation:
Janet E. Kübler,Steven R. Dudgeon. Predicting Effects of Ocean Acidification and Warming on Algae Lacking Carbon Concentrating Mechanisms[J]. PLOS ONE,2015-01-01,10(7)
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