Sammendrag
The present study explored short-term temporal variations in circulating concentrations of 3 legacy organochlorines with
different physicochemical properties (polychlorinated biphenyl 153 [PCB-153], p,p0-dichlorodiphenyldichloroethylene [DDE], and
hexachlorobenzene [HCB]) in breeding kittiwakes (Rissa tridactyla) in a colony in Svalbard (788N), Norwegian Arctic. Concentrations
were measured in blood of a large number (n¼412–521 blood samples, depending on the data analyses) of prebreeding, incubating, and
chick-rearing birds over a period of 5 yr (2007–2011). The PCB-153 concentrations were equal in male and female blood in the
prebreeding period, whereas females had significantly lower concentrations during incubation and chick rearing, probably because of
their ability to eliminate organochlorines through egg laying. A similar temporal pattern was observed with DDE, although the lower
concentrations in incubating females were not significant. Males and females had similar concentrations of HCB over all reproductive
stages. The concentrations of all 3 compounds varied greatly between years. The concentrations of PCB-153 tended to decline over the
study period, whereas concentrations of HCB showed an increasing trend, especially among chick-rearing males late in the season.
Concentrations of PCB-153 increased approximately 2.5 times from the prebreeding to the chick-rearing period, concurrent with
mobilization of body lipids (reduced body mass).Asimilar, but less pronounced trend was found for HCB. For DDE, however, kittiwakes
had the highest concentrations in the prebreeding period, suggesting relatively high exposure in their winter areas. The present study
documented large variations in circulating concentrations of legacy organochlorines among and within breeding seasons in kittiwakes,
but the alterations within seasons were relatively consistent from year to year. Environ Toxicol Chem 2016;9999:1–7.#2016 SETAC
Kittiwake Organochlorines Marine pollution Seasonal variation
Vis fullstendig beskrivelse
