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Temporal and spatial trends of PCB congeners in UK gannet eggs.

Alcock, Ruth E. and Boumphrey, Ruth and Malcolm, Heath and Osborn, Daniel and Jones, Kevin C. (2002) Temporal and spatial trends of PCB congeners in UK gannet eggs. AMBIO: A Journal of the Human Environment, 31 (3). pp. 202-206. ISSN 0044-7447

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Abstract

Gannet (Sula bassana) eggs collected from Ailsa Craig, Western Scotland between 1977–1998 have been analyzed retrospectively for several PCB congeners. Concentrations of a range of congeners were determined in 8–10 eggs analyzed separately for several individual years. All congeners declined in concentrations throughout the time period, but the rates of decline differed for different congeners. Declines were first order and half-lives varied between 5.4 years for PCB-101 to 10.1 years for PCB-180. Egg concentrations reflect the maternal body burden, which itself is controlled by the birds rate of intake (principally via the diet) and losses (via metabolism and other clearance mechanisms). The declining concentrations in eggs, therefore, broadly reflect reductions in prey concentrations (principally herring and mackerel) and—in turn—water column concentrations. Rates of change in PCB concentrations from this study were similar to those noted in fish-eating birds from the Baltic Sea and North American Great Lakes, and ambient air in the UK. This provides indirect evidence that gannet eggs are broadly reflecting regional/global scale clearance/removal mechanisms which are controlling ambient PCB concentrations.

Item Type: Article
Journal or Publication Title: AMBIO: A Journal of the Human Environment
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21438
Deposited By: ep_ss_importer
Deposited On: 14 Jan 2009 11:36
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:47
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21438

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