Dynamics of inorganic phosphorus in pelagic communities of the Sea of Okhotsk
Inorganic phosphorus uptake and regeneration in the Okhotsk Sea waters were investigated in July–August 1994 with the use of radioisotopic techniques. The rates of PO 4 -P uptake by microplankton in the upper mixed layer were between 1.5 and 6.6 μg P l−1 day−1 (average 2.75) in areas of diatom domin...
| Published in: | Journal of Plankton Research |
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| Main Author: | |
| Format: | Text |
| Language: | English |
| Published: |
Oxford University Press
2002
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| Online Access: | http://plankt.oxfordjournals.org/cgi/content/short/24/12/1253 https://doi.org/10.1093/plankt/24.12.1253 |
| Summary: | Inorganic phosphorus uptake and regeneration in the Okhotsk Sea waters were investigated in July–August 1994 with the use of radioisotopic techniques. The rates of PO 4 -P uptake by microplankton in the upper mixed layer were between 1.5 and 6.6 μg P l−1 day−1 (average 2.75) in areas of diatom dominance, and between 0.68 and 1.68 μg P l−1 day−1 (average 1.16) in areas of intense warming and summer phytoplankton minimum. The residence time of PO 4 -P standing stock in water at different stations varied between 1.5 and 24 days (mean 9 days). The share of bacterioplankton contributing to total PO 4 -P uptake was ∼50% in areas of the summer phytoplankton minimum and 20–30% in areas of diatom dominance. The PO 4 -P regeneration rate was measured first time experimentally in the temperate sea. Its rates varied from 0.30 to 1.65 μg P l−1 day−1. In areas of diatom dominance, it compensated with 30–60% of PO 4 -P uptake. In zones of summer phytoplankton minimum and in the layers of deep chlorophyll maxima at 10–25 m depths, the PO 4 -P regeneration rate often exceeded its uptake. Primary phytoplankton production correlated well with PO 4 -P uptake values in the upper mixed layer, while no correlation was found between primary production and the ambient PO 4 -P content in water. |
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