Trace metal concentrations in seven Pterodroma species

Gadfly petrels (Pterodroma spp.) are one of the most threatened and poorly studied seabird groups, and as apex predators, are likely exposed to chemical pollutants. We quantified trace elements in breast feathers of seven petrel species which breed in the southern hemisphere, to quantify current concentrations and test for an effect of age class. Selenium (Se) concentrations were significantly lower in chicks than adults; this was not observed for zinc (Zn) or lead (Pb). Overall, the species examined here exhibited similar concentrations of Se, with Pb and Zn concentrations more variable among species. The mean Se concentration in adult birds exceeded those thought to be potentially deleterious, and three species were above the assumed threshold for Pb toxicity. Further investigation of potentially toxic trace elements in gadfly petrels is warranted.