author_facet Bentzen, E.
Taylor, W. D.
Millard, E. S.
Bentzen, E.
Taylor, W. D.
Millard, E. S.
author Bentzen, E.
Taylor, W. D.
Millard, E. S.
spellingShingle Bentzen, E.
Taylor, W. D.
Millard, E. S.
Limnology and Oceanography
The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
Aquatic Science
Oceanography
author_sort bentzen, e.
spelling Bentzen, E. Taylor, W. D. Millard, E. S. 0024-3590 1939-5590 Wiley Aquatic Science Oceanography http://dx.doi.org/10.4319/lo.1992.37.2.0217 <jats:p>The substrate [<jats:italic>α</jats:italic>‐<jats:sup>3</jats:sup><jats:sc><jats:sup>2</jats:sup></jats:sc>P]ATP was used to represent the available fraction of the dissolved phosphomonoester (PME) pool and to measure its rate of assimilation by freshwater plankton in systems of low phosphorus availability. We compared [<jats:sup>32</jats:sup>P]ATP uptake to inorganic <jats:sup>32</jats:sup>PO<jats:sub>4</jats:sub><jats:sup>3‒</jats:sup> uptake. The upper bounds to the pool sizes of PO<jats:sub>4</jats:sub><jats:sup>3‒</jats:sup> and PME were estimated with Rigler bioassays, and these values, together with the uptake constants at ambient substrate concentrations, permit comparison of the uptake of organic and inorganic P by limnetic plankton. Affinity of the plankton for both substrates was high, and the estimated flux rates from both pools were similar, demonstrating that PME contributes significantly to total P uptake. We tested the hypothesis that algae &gt;1 <jats:italic>µ</jats:italic>m preferentially assimilate P from PME but observed that the 0.2–1‐<jats:italic>µ</jats:italic>m size fraction dominates uptake of P from either source at ambient concentrations. The specific flux of P from PME into the 1–12‐<jats:italic>µ</jats:italic>m size fraction was often as high as that into the 0.2–1‐<jats:italic>µ</jats:italic>m fraction, but plankton &gt;12 <jats:italic>µ</jats:italic>m typically incorporate &lt;5% of the P from either source.</jats:p> The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton Limnology and Oceanography
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series Limnology and Oceanography
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title The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_unstemmed The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_full The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_fullStr The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_full_unstemmed The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_short The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_sort the importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
topic Aquatic Science
Oceanography
url http://dx.doi.org/10.4319/lo.1992.37.2.0217
publishDate 1992
physical 217-231
description <jats:p>The substrate [<jats:italic>α</jats:italic>‐<jats:sup>3</jats:sup><jats:sc><jats:sup>2</jats:sup></jats:sc>P]ATP was used to represent the available fraction of the dissolved phosphomonoester (PME) pool and to measure its rate of assimilation by freshwater plankton in systems of low phosphorus availability. We compared [<jats:sup>32</jats:sup>P]ATP uptake to inorganic <jats:sup>32</jats:sup>PO<jats:sub>4</jats:sub><jats:sup>3‒</jats:sup> uptake. The upper bounds to the pool sizes of PO<jats:sub>4</jats:sub><jats:sup>3‒</jats:sup> and PME were estimated with Rigler bioassays, and these values, together with the uptake constants at ambient substrate concentrations, permit comparison of the uptake of organic and inorganic P by limnetic plankton. Affinity of the plankton for both substrates was high, and the estimated flux rates from both pools were similar, demonstrating that PME contributes significantly to total P uptake. We tested the hypothesis that algae &gt;1 <jats:italic>µ</jats:italic>m preferentially assimilate P from PME but observed that the 0.2–1‐<jats:italic>µ</jats:italic>m size fraction dominates uptake of P from either source at ambient concentrations. The specific flux of P from PME into the 1–12‐<jats:italic>µ</jats:italic>m size fraction was often as high as that into the 0.2–1‐<jats:italic>µ</jats:italic>m fraction, but plankton &gt;12 <jats:italic>µ</jats:italic>m typically incorporate &lt;5% of the P from either source.</jats:p>
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author Bentzen, E., Taylor, W. D., Millard, E. S.
author_facet Bentzen, E., Taylor, W. D., Millard, E. S., Bentzen, E., Taylor, W. D., Millard, E. S.
author_sort bentzen, e.
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description <jats:p>The substrate [<jats:italic>α</jats:italic>‐<jats:sup>3</jats:sup><jats:sc><jats:sup>2</jats:sup></jats:sc>P]ATP was used to represent the available fraction of the dissolved phosphomonoester (PME) pool and to measure its rate of assimilation by freshwater plankton in systems of low phosphorus availability. We compared [<jats:sup>32</jats:sup>P]ATP uptake to inorganic <jats:sup>32</jats:sup>PO<jats:sub>4</jats:sub><jats:sup>3‒</jats:sup> uptake. The upper bounds to the pool sizes of PO<jats:sub>4</jats:sub><jats:sup>3‒</jats:sup> and PME were estimated with Rigler bioassays, and these values, together with the uptake constants at ambient substrate concentrations, permit comparison of the uptake of organic and inorganic P by limnetic plankton. Affinity of the plankton for both substrates was high, and the estimated flux rates from both pools were similar, demonstrating that PME contributes significantly to total P uptake. We tested the hypothesis that algae &gt;1 <jats:italic>µ</jats:italic>m preferentially assimilate P from PME but observed that the 0.2–1‐<jats:italic>µ</jats:italic>m size fraction dominates uptake of P from either source at ambient concentrations. The specific flux of P from PME into the 1–12‐<jats:italic>µ</jats:italic>m size fraction was often as high as that into the 0.2–1‐<jats:italic>µ</jats:italic>m fraction, but plankton &gt;12 <jats:italic>µ</jats:italic>m typically incorporate &lt;5% of the P from either source.</jats:p>
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spelling Bentzen, E. Taylor, W. D. Millard, E. S. 0024-3590 1939-5590 Wiley Aquatic Science Oceanography http://dx.doi.org/10.4319/lo.1992.37.2.0217 <jats:p>The substrate [<jats:italic>α</jats:italic>‐<jats:sup>3</jats:sup><jats:sc><jats:sup>2</jats:sup></jats:sc>P]ATP was used to represent the available fraction of the dissolved phosphomonoester (PME) pool and to measure its rate of assimilation by freshwater plankton in systems of low phosphorus availability. We compared [<jats:sup>32</jats:sup>P]ATP uptake to inorganic <jats:sup>32</jats:sup>PO<jats:sub>4</jats:sub><jats:sup>3‒</jats:sup> uptake. The upper bounds to the pool sizes of PO<jats:sub>4</jats:sub><jats:sup>3‒</jats:sup> and PME were estimated with Rigler bioassays, and these values, together with the uptake constants at ambient substrate concentrations, permit comparison of the uptake of organic and inorganic P by limnetic plankton. Affinity of the plankton for both substrates was high, and the estimated flux rates from both pools were similar, demonstrating that PME contributes significantly to total P uptake. We tested the hypothesis that algae &gt;1 <jats:italic>µ</jats:italic>m preferentially assimilate P from PME but observed that the 0.2–1‐<jats:italic>µ</jats:italic>m size fraction dominates uptake of P from either source at ambient concentrations. The specific flux of P from PME into the 1–12‐<jats:italic>µ</jats:italic>m size fraction was often as high as that into the 0.2–1‐<jats:italic>µ</jats:italic>m fraction, but plankton &gt;12 <jats:italic>µ</jats:italic>m typically incorporate &lt;5% of the P from either source.</jats:p> The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton Limnology and Oceanography
spellingShingle Bentzen, E., Taylor, W. D., Millard, E. S., Limnology and Oceanography, The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton, Aquatic Science, Oceanography
title The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_full The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_fullStr The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_full_unstemmed The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_short The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_sort the importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
title_unstemmed The importance of dissolved organic phosphorus to phosphorus uptake by limnetic plankton
topic Aquatic Science, Oceanography
url http://dx.doi.org/10.4319/lo.1992.37.2.0217