气候变化领域集成服务门户(CCPortal): Effects of Nitrogen Limitation on Phytoplankton Physiology in the Western Arctic Ocean in Summer

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DOI	10.1029/2020JC016501
	Effects of Nitrogen Limitation on Phytoplankton Physiology in the Western Arctic Ocean in Summer
	Ko E.; Gorbunov M.Y.; Jung J.; Joo H.M.; Lee Y.; Cho K.-H.; Yang E.J.; Kang S.-H.; Park J.
发表日期	2020
ISSN	21699275
卷号	125 期号:11
英文摘要	Phytoplankton in the Arctic Ocean are subject to nitrogen limitation in the summer, however, how severely the nitrogen stress affects phytoplankton physiology remains largely unknown. In the summers of 2015–2018, we examined the distribution of phytoplankton photophysiological properties across two contrasting regions of the Arctic Ocean with distinctly different levels of nitrogen availability in the upper water column. We quantified the extent of nitrogen stress using a highly sensitive fluorescence induction and relaxation system to obtain continuous underway measurements and via discrete sample analyses of phytoplankton physiology, as well as nutrient enrichment incubations. The results revealed vast regions in the Chukchi Sea where phytoplankton photosynthesis was severely nitrogen-stressed. Thereby, the maximum quantum yield of photochemistry in photosystem II showed only a small decrease (12 ± 9%) relative to its nutrient-replete values, while the maximum photosynthetic electron transport rates under saturating irradiance were impaired to a greater extent (40 ± 17%). This phytoplankton photosynthesis response is indicative of a severe nitrogen limitation, which results in dramatic reduction in growth and net primary production rates. Nutrient enrichment incubations also revealed a marked increase in large-size phytoplankton growth (>10 μm) after the nitrogen stress was alleviated, suggesting that the larger cells were more susceptible to nitrogen stress. These results are important for understanding how regional nitrogen fluxes control variability in the primary production and phytoplankton community structure and how these processes might change with rapid climate changes in the Arctic Ocean. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	maximum electron transfer rate; nitrogen limitation; phytoplankton photophysiology; the western Arctic Ocean; variable fluorescence
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186592
作者单位	Division of Polar Ocean Sciences, Korea Polar Research Institute, Incheon, South Korea; University of Science and Technology, Daejeon, South Korea; Department of Marine and Coastal Science, Rutgers University, New Brunswick, NJ, United States
推荐引用方式 GB/T 7714	Ko E.,Gorbunov M.Y.,Jung J.,et al. Effects of Nitrogen Limitation on Phytoplankton Physiology in the Western Arctic Ocean in Summer[J],2020,125(11).
APA	Ko E..,Gorbunov M.Y..,Jung J..,Joo H.M..,Lee Y..,...&Park J..(2020).Effects of Nitrogen Limitation on Phytoplankton Physiology in the Western Arctic Ocean in Summer.Journal of Geophysical Research: Oceans,125(11).
MLA	Ko E.,et al."Effects of Nitrogen Limitation on Phytoplankton Physiology in the Western Arctic Ocean in Summer".Journal of Geophysical Research: Oceans 125.11(2020).