John Wiley & Sons, Ltd.

Plasma concentrations of organohalogenated pollutants in predatory bird nestlings: Associations to growth rate and dietary tracers

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The extent to which persistent organic pollutants (POPs) with different physicochemical properties originated from the food (dietary input) was assessed in raptor nestlings. Lipophilic polychlorinated biphenyl (PCB) 153, 1‐dichloro‐2,2‐bis (p‐chlorophenyl) ethylene (p,p'‐DDE) and hexachlorobenzene (HCB), and protein‐bound perfluorooctane sulfonate (PFOS), were measured repeatedly in blood plasma of individual goshawk (Accipiter gentilis) and white‐tailed eagle (Haliaeetus albicilla) nestlings; 1–3 weeks after hatching and near fledging. Maternally derived POPs dilute as nestlings grow (growth dilution), and increasing plasma concentrations would indicate dietary input. Firstly, plasma concentrations given no dietary input was estimated, and concentrations of p,p'‐DDE, HCB, and notably PFOS were significantly higher than predicted from a growth dilution scenario (∼1.5–2.5 fold higher; P < 0.001). In contrast, PCB 153 declined in both species, although concentrations were 1.16 fold higher than predicted in white‐tailed eagle nestlings (P < 0.03). Secondly, the relationships between plasma POP concentrations and trophic position (δ15N) and dietary carbon source (δ13C) were analysed in body feathers, controlling for growth rate. Both δ15N and δ13C were significantly associated to the accumulation of most POPs, except PFOS. In conclusion, pollutant data acquired in plasma of nestling raptors should be interpreted and further investigated in the light of individual feeding ecology, and the use of raptor nestlings as sentinels for POP monitoring could be optimized by correcting for different factors, for example body condition, brood size and age. Environ Toxicol Chem © 2013 SETAC

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