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Cadmium uptake by marine micro-organisms in the English Channel and Celtic Sea

Record type: Article

A series of shipboard experiments using the radiotracer 109Cd investigated the role of phytoplankton and bacteria in the uptake of dissolved Cd in the English Channel and Celtic Sea. The results demonstrate that Cd uptake is related to rates of primary production and bacterial numbers. Statistical analysis of plankton species abundance infer that Rhizosolenia, Chaetoceros and Pseudonitzschia diatom species are largely responsible for the higher Cd uptake observed in the >5 ?m size fraction during a diatom-dominated spring bloom. Total Cd uptake rates during winter non-bloom conditions were between 0.04 and 0.29 pmol l–1 h–1, and increased to between 0.43 and 1.23 pmol l–1 h–1 during diatom bloom conditions. These uptake rates are consistent with the seasonal surface depletion of Cd reported in the Celtic Sea and attributed to uptake by phytoplankton bloom material. A calculated Cd:C ratio of 3.1 ?mol mol–1 for natural plankton samples of the Celtic Sea agrees well with results of previous culture studies, which have reported ratios between 0.1 and 5.0 ?mol mol–1 for the coastal diatoms Thalassiosira weissflogii and T. pseudonana. Cd uptake was also linearly related to bacterial numbers, which was attributed to surface adsorption of Cd ions onto bacterial particles which have relatively high specific surface areas. These results demonstrate surface adsorption of Cd onto bacterial surfaces, and other biogenic non-living particles, i.e. ‘passive Cd uptake’, which is significantly augmented during a spring diatom bloom.

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Citation

Dixon, J.L., Statham, P.J., Widdicombe, C.E., Jones, R.M., Barquero-Molina, S., Dickie, B., Nimmo, M. and Turley, C.M. (2006) Cadmium uptake by marine micro-organisms in the English Channel and Celtic Sea Aquatic Microbial Ecology, 44, (1), pp. 31-43.

More information

Published date: 2006
Keywords: cadmium uptake, cadmium carbon ratios, phytoplankton, diatom blooms, heterotrophic bacteria, Celtic Sea

Identifiers

Local EPrints ID: 41825
URI: http://eprints.soton.ac.uk/id/eprint/41825
ISSN: 0948-3055
PURE UUID: 20c5a79d-fb2d-4c8c-ad61-53fcf77dec77

Catalogue record

Date deposited: 05 Oct 2006
Last modified: 17 Jul 2017 15:27

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Contributors

Author: J.L. Dixon
Author: P.J. Statham
Author: C.E. Widdicombe
Author: R.M. Jones
Author: S. Barquero-Molina
Author: B. Dickie
Author: M. Nimmo
Author: C.M. Turley

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