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• W2891420538 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 604:51-63 (2018) - DOI: https://doi.org/10.3354/meps12747 Ecophysiological linkage of nitrogen enrichment to heavily silicified diatoms in winter Dongyan Liu1,*, Patricia M. Glibert2 1State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, PR China 2University of Maryland Center for Environmental Science, Horn Point Laboratory, Cambridge, MD 21613, USA *Corresponding author: dyliu@sklec.ecnu.edu.cn ABSTRACT: Over recent decades, increased anthropogenic nitrogen and reduced land-based loading of silica in many coastal waters have asymmetrically changed the nitrogen:silica ratios. These changes have contributed to shifts in phytoplankton assemblages from diatoms to non-diatoms, as well as increases in the frequency and magnitude of non-diatom harmful algal blooms. Here we show a subtle and counterintuitive change in diatom assemblage, i.e. heavily silicified diatoms significantly increased in winter after nitrogen enrichment, based on paleoecological and contemporary seasonal water column data from 2 eutrophic bays in the Yellow Sea. The heavily silicified diatom Paralia sulcata showed an increasing trend over time in parallel with nitrogen enrichment, which was associated with low temperature, and low dissolved inorganic nitrogen:phosphorus, high dissolved nitrogen:silica, and low ammonium:nitrate ratios on a seasonal basis. Applying recent insights regarding diatom nitrogen metabolism and its putative urea cycle, a physiological mechanism linking nitrogen, carbon, and silica metabolism is suggested to explain the phenomenon of increased silicification under winter conditions at the cellular level. Winter sequestration of silica in P. sulcata valves also has biogeochemical consequences, including a weakening of the silica pump and a slowing of biogenic silica dissolution, thereby reducing the availability of silica for further diatom growth in subsequent seasons and increasing the window of opportunity for summer growth of non-diatom harmful algal bloom species. KEY WORDS: Paralia sulcate · Nitrification · Diatom metabolism · Photosynthesis · Phytoplankton shift · Si cycling Full text in pdf format PreviousNextCite this article as: Liu D, Glibert PM (2018) Ecophysiological linkage of nitrogen enrichment to heavily silicified diatoms in winter. Mar Ecol Prog Ser 604:51-63. https://doi.org/10.3354/meps12747 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 604. Online publication date: October 04, 2018 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2018 Inter-Research." @default.
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• W2891420538 date "2018-10-04" @default.
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• W2891420538 title "Ecophysiological linkage of nitrogen enrichment to heavily silicified diatoms in winter" @default.
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• W2891420538 doi "https://doi.org/10.3354/meps12747" @default.
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