Pluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditions

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dc.contributor.authorGlibert, Patricia M.
dc.contributor.authorWilkerson, Frances P.
dc.contributor.authorDugdale, Richard C.
dc.contributor.authorRaven, John A.
dc.contributor.authorDupont, Christopher L.
dc.contributor.authorLeavitt, Peter R.
dc.contributor.authorParker, Alexander E.
dc.contributor.authorBurkholder, JoAnn M.
dc.contributor.authorKana, Todd M.
dc.date.accessioned2023-06-30T15:54:57Z
dc.date.available2023-06-30T15:54:57Z
dc.date.issued2015-10-11
dc.description© 2015 The Authors Limnology and Oceanography published by Wiley Periodicals, Inc. on behalf of Association for the Sciences of Limnology and Oceanography. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en_US
dc.description.abstractAnthropogenic activities are altering total nutrient loads to many estuaries and freshwaters, resulting in high loads not only of total nitrogen (N), but in some cases, of chemically reduced forms, notably NH1 4 . Long thought to be the preferred form of N for phytoplankton uptake, NH1 4 may actually suppress overall growth when concentrations are sufficiently high. NH1 4 has been well known to be inhibitory or repressive for NO- 3 uptake and assimilation, but the concentrations of NH1 4 that promote vs. repress NO- 3 uptake, assimi- lation, and growth in different phytoplankton groups and under different growth conditions are not well understood. Here, we review N metabolism first in a “generic” eukaryotic cell, and the contrasting metabolic pathways and regulation of NH1 4 and NO2 3 when these substrates are provided individually under equivalent growth conditions. Then the metabolic interactions of these substrates are described when both are provided together, emphasizing the cellular challenge of balancing nutrient acquisition with photosynthetic energy balance in dynamic environments. Conditions under which dissipatory pathways such as dissimilatory NO2 3 / NO2 2 reduction to NH1 4 and photorespiration that may lead to growth suppression are highlighted. While more is known about diatoms, taxon-specific differences in NH1 4 and NO2 3 metabolism that may contribute to changes in phytoplankton community composition when the composition of the N pool changes are pre- sented. These relationships have important implications for harmful algal blooms, development of nutrient criteria for management, and modeling of nutrient uptake by phytoplankton, particularly in conditions where eutrophication is increasing and the redox state of N loads is changing.en_US
dc.description.authorstatusFacultyen_US
dc.description.peerreviewyesen_US
dc.description.sponsorshipPMG was supported by the State and Federal Water Contractors Agency (grant 15-02) and she, FPW, RCD, and AEP were also supported by the Delta Stewardship Council (grant 2018). PRL was supported by NSERC Can- ada, Canada Chairs Program and Fulbright Canada.en_US
dc.identifier.citationGlibert, P.M., F.P. Wilkerson, R.C. Dugdale, J.A. Raven, C. Dupont, P.R. Leavitt, A.E. Parker, J.M. Burkholder, and T.M. Kana. 2016. Pluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditions. Limnol. Oceanogr. 61: 165-197. doi.org/10.1002/lno.10203en_US
dc.identifier.doihttps://doi.org/10.1002/lno.10203
dc.identifier.urihttps://hdl.handle.net/10294/15992
dc.language.isoenen_US
dc.publisherWileyen_US
dc.rightsAttribution 4.0 International*
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/*
dc.titlePluses and minuses of ammonium and nitrate uptake and assimilation by phytoplankton and implications for productivity and community composition, with emphasis on nitrogen-enriched conditionsen_US
dc.typeArticleen_US
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