Particulate polyphosphate and alkaline phosphatase activity across a latitudinal transect in the tropical Indian Ocean
Polyphosphate (polyP) is an essential chemical constituent of microbial cells, and is hypothesized to play important roles in the marine biogeochemistry of phosphorus. However, polyP has only rarely been measured in the oceans. Here, we present data on the distribution of polyP across a latitudinal...
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sg-ntu-dr.10356-874352020-09-21T11:32:19Z Particulate polyphosphate and alkaline phosphatase activity across a latitudinal transect in the tropical Indian Ocean Martin, Patrick Lauro, Federico M. Sarkar, Amit Prakash, Satya Vinayachandran, P. N. Goodkin, Nathalie Fairbank Asian School of the Environment Singapore Centre for Environmental Life Sciences Engineering Earth Observatory of Singapore Polyphosphate Marine Biogeochemistry Polyphosphate (polyP) is an essential chemical constituent of microbial cells, and is hypothesized to play important roles in the marine biogeochemistry of phosphorus. However, polyP has only rarely been measured in the oceans. Here, we present data on the distribution of polyP across a latitudinal transect in the tropical Indian Ocean. PolyP concentrations (quantified as molar equivalents of a synthetic polyP standard) and ratios of polyP to total particulate phosphorus (TPP) along the transect ranged between 3–7 nmol eq. L−1 (polyP concentration) and 0.2–0.4 nmol eq. nmol−1 (polyP : TPP ratio), which is very similar to values reported from the North Pacific Subtropical Gyre. Yet unlike in the North Pacific, soluble reactive phosphorus was depleted to low concentrations (≤ 0.03 μmol L−1), and alkaline phosphatase activity was relatively high (1–4 nmol P L−1 h−1) along our cruise track. We attribute these results to the unique seasonal changes in iron and macronutrient supply in the Indian Ocean, which are caused by the monsoonal reversal in ocean currents. PolyP concentrations and polyP : TPP ratios decreased sharply with depth down to 150 m, suggesting that polyP was preferentially recycled relative to TPP, unlike in the North Pacific Subtropical Gyre. We hypothesize that alkaline phosphatase exerts a significant control over marine polyP biogeochemistry. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2018-02-06T07:01:18Z 2019-12-06T16:41:50Z 2018-02-06T07:01:18Z 2019-12-06T16:41:50Z 2018 Journal Article Martin, P., Lauro, F. M., Sarkar, A., Goodkin, N., Prakash, S., & Vinayachandran, P. N. (2018). Particulate polyphosphate and alkaline phosphatase activity across a latitudinal transect in the tropical Indian Ocean. Limnology and Oceanography, 63(3), 1395-1406. 0024-3590 https://hdl.handle.net/10356/87435 http://hdl.handle.net/10220/44411 10.1002/lno.10780 en Limnology and Oceanography © 2018 The Authors, 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. 12 p. application/pdf |
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Polyphosphate Marine Biogeochemistry Martin, Patrick Lauro, Federico M. Sarkar, Amit Prakash, Satya Vinayachandran, P. N. Goodkin, Nathalie Fairbank Particulate polyphosphate and alkaline phosphatase activity across a latitudinal transect in the tropical Indian Ocean |
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Polyphosphate (polyP) is an essential chemical constituent of microbial cells, and is hypothesized to play important roles in the marine biogeochemistry of phosphorus. However, polyP has only rarely been measured in the oceans. Here, we present data on the distribution of polyP across a latitudinal transect in the tropical Indian Ocean. PolyP concentrations (quantified as molar equivalents of a synthetic polyP standard) and ratios of polyP to total particulate phosphorus (TPP) along the transect ranged between 3–7 nmol eq. L−1 (polyP concentration) and 0.2–0.4 nmol eq. nmol−1 (polyP : TPP ratio), which is very similar to values reported from the North Pacific Subtropical Gyre. Yet unlike in the North Pacific, soluble reactive phosphorus was depleted to low concentrations (≤ 0.03 μmol L−1), and alkaline phosphatase activity was relatively high (1–4 nmol P L−1 h−1) along our cruise track. We attribute these results to the unique seasonal changes in iron and macronutrient supply in the Indian Ocean, which are caused by the monsoonal reversal in ocean currents. PolyP concentrations and polyP : TPP ratios decreased sharply with depth down to 150 m, suggesting that polyP was preferentially recycled relative to TPP, unlike in the North Pacific Subtropical Gyre. We hypothesize that alkaline phosphatase exerts a significant control over marine polyP biogeochemistry. |
author2 |
Asian School of the Environment |
author_facet |
Asian School of the Environment Martin, Patrick Lauro, Federico M. Sarkar, Amit Prakash, Satya Vinayachandran, P. N. Goodkin, Nathalie Fairbank |
format |
Article |
author |
Martin, Patrick Lauro, Federico M. Sarkar, Amit Prakash, Satya Vinayachandran, P. N. Goodkin, Nathalie Fairbank |
author_sort |
Martin, Patrick |
title |
Particulate polyphosphate and alkaline phosphatase activity across a latitudinal transect in the tropical Indian Ocean |
title_short |
Particulate polyphosphate and alkaline phosphatase activity across a latitudinal transect in the tropical Indian Ocean |
title_full |
Particulate polyphosphate and alkaline phosphatase activity across a latitudinal transect in the tropical Indian Ocean |
title_fullStr |
Particulate polyphosphate and alkaline phosphatase activity across a latitudinal transect in the tropical Indian Ocean |
title_full_unstemmed |
Particulate polyphosphate and alkaline phosphatase activity across a latitudinal transect in the tropical Indian Ocean |
title_sort |
particulate polyphosphate and alkaline phosphatase activity across a latitudinal transect in the tropical indian ocean |
publishDate |
2018 |
url |
https://hdl.handle.net/10356/87435 http://hdl.handle.net/10220/44411 |
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1681056497895735296 |