Journal article
Isotopic fractionation of ammonium and nitrate during uptake by Skeletonema costatum: Implications for δ15N dynamics under bloom conditions
Limnology and oceanography, v 41(3), pp 451-459
May 1996
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Abstract
Isotopic fractionation of ammonium (NH4+) and nitrate (NO3−) during uptake by phytoplankton was examined in batch culture experiments with the diatom Skeletonema costatum under nitrogen‐enriched conditions (5–100 µM). The fractionation factor (ε) for NO3− uptake by Skeletonema was −9.0±0.7‰ and was concentration‐independent. For NH4+, ε was more variable and dependent on ambient NH4+ concentration. For NH4+ concentration ranges of 100‐50, 50‐20, and 20‐5 µM, ε was −24.6±5.5, −27.2±1.6, and −7.8±3.0‰. In these cultures, isotopic fractionation by phytoplankton caused variations in δ15N of up to 50‰ for NH4+, 12‰ for NO3−, and 25% for particulate N. Similar variability in the δ15N of both dissolved inorganic and particulate organic N pools should be expected during phytoplankton blooms in nature. As a result, phytoplankton‐mediated isotopic variability must be considered when isotopic data are used to examine biogeochemical and physical processing of organic matter in marine ecosystems, particularly when biosynthesis and loss processes are decoupled in either space or time during bloom conditions.
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Details
- Title
- Isotopic fractionation of ammonium and nitrate during uptake by Skeletonema costatum: Implications for δ15N dynamics under bloom conditions
- Creators
- Jonathan R. Pennock - University of DelawareDavid J. Velinsky - University of DelawareJohn M. Ludlam - University of DelawareJonathan H. Sharp - University of DelawareMarilyn L. Fogel - Carnegie Institution for Science
- Publication Details
- Limnology and oceanography, v 41(3), pp 451-459
- Number of pages
- 9
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Biodiversity, Earth, and Environmental Science (BEES)
- Web of Science ID
- WOS:A1996UW65700009
- Scopus ID
- 2-s2.0-0029741365
- Other Identifier
- 991019174674104721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Limnology
- Oceanography