The release of copper-complexing ligands by the brown alga Fucus vesiculosus (Phaeophyceae) in response to increasing total copper levels.

Gledhill, Martha , Nimmo, Malcolm and Hill, Steve J. (1999) The release of copper-complexing ligands by the brown alga Fucus vesiculosus (Phaeophyceae) in response to increasing total copper levels. Journal of Phycology, 35 (3). pp. 501-509. DOI 10.1046/j.1529-8817.1999.3530501.x.

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Abstract

The growth of Fucus vesiculosus L, germlings in chemically defined culture media containing a range of Cu concentrations (20-1000 nM) was monitored simultaneously with measurement of the Cu speciation in the media by competitive equilibrium-adsorptive cathodic stripping voltammetry, Fucus vesiculosus germlings were found to exude Cu-complexing Ligands with conditional stability constants of the order of 1.6 x 10(11), Ligand concentrations increased with increasing total dissolved Cu concentrations (Cu-T) until a concentration of 500-800 neq Cu.L-1 was reached. Concentrations of the ligand exceeded Cu-T in treatments containing 20 and 100 nM Cu-T were similar to Cu-T in the 500-nM Cu treatment, but were less than Cu-T in the 1000-nM treatment. Therefore, [Cu2+] were calculated to be at concentrations of 10(-11) - 10(-10) M in the 20- and 100-nM treatments, 10(-9) M in the 500-nM treatment, and 10(-7) M in the 1000-nM treatment, Growth rates were lowest at Cu2+ concentration > 10(-9). These results are discussed within the context of the potential roles for exuded copper-complexing ligands

Document Type: Article
Keywords: copper; copper-complexing ligands; Fucus sp.; Fucus vesiculosus; Phaeophyceae; toxic response
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1046/j.1529-8817.1999.3530501.x
ISSN: 0022-3646
Date Deposited: 16 Sep 2015 11:21
Last Modified: 30 May 2017 09:21
URI: http://oceanrep.geomar.de/id/eprint/29683

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