Iron and zinc enrichments in the northeastern subarctic Pacific: ligand production and zinc availability in response to phytoplankton growth
Lohan, M.C., Crawford, D.W., Purdie, D.A. and Statham, P.J. (2005) Iron and zinc enrichments in the northeastern subarctic Pacific: ligand production and zinc availability in response to phytoplankton growth. Limnology and Oceanography, 50, (5), 1427-1437.
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Description/Abstract
Iron- and zinc-enrichment experiments were carried out at Ocean Station Papa in the subarctic North Pacific. In iron-enriched treatments AI phytoplankton chlorophyll a (Chl a) increased 20-fold (9.7 mu g L-1) above the concentration on day zero. No stimulation of Chl a production or nitrate drawdown was observed on addition of zinc alone compared to the control. In the iron-enriched treatment, bioavailable zinc concentration decreased to 0.2 pmol L-1 lower than that which is known in culture experiments to limit some phytoplankton growth. Theoretical analyses suggest that this zinc concentration would cause diffusion-limited growth of large diatom cells present at the end of the incubation. Direct measurements of zinc-binding ligands indicate that the natural microbial planktonic assemblages have the ability to respond rapidly to conditions of high dissolved zinc concentrations. Rapid ligand production may be a mechanism by which certain phytoplankton reduce zinc toxicity or for maintaining zinc concentrations in the upper water column. Zinc-binding ligands were observed to be both produced and removed on the timescale of 1 d. We suggest that these zinc-binding ligands are produced to assist assimilation, particularly under iron-enriched conditions when concentrations of bioavailable zinc were extremely low, thereby alleviating the effects of zinc limitation.
| Item Type: | Article |
|---|---|
| Additional Information: | Not available online until Autumn 2008 |
| Subjects: | Q Science > QH Natural history > QH301 Biology G Geography. Anthropology. Recreation > GC Oceanography |
| Divisions: | University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES) |
| Item ID: | 17746 |
| Date Deposited: | 24 Oct 2005 |
| Last Modified: | 01 Jun 2011 01:43 |
| Contributors: | Lohan, M.C. (Author) Crawford, D.W. (Author) Purdie, D.A. (Author) Statham, P.J. (Author) |
| Date: | 2005 |
| Additional Information: | Not available online until Autumn 2008 |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/17746 |
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