Urban proximity while breeding is not a predictor of perfluoroalkyl substance contamination in the eggs of brown pelicans

Wilkinson, Bradley P.; Robuck, Anna R.; Lohmann, Rainer; Pickard, Heidi M.; Jodice, Patrick G. R.

doi:10.1016/j.scitotenv.2021.150110

Cited by 9 publications

(3 citation statements)

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“…Marine input and urbanization (approximated by δ 13 C) are often strong predictors of emergent contaminant concentrations ,− and could partly explain why seabirds foraging in different marine habitats, such as coastal (higher δ 13 C) versus offshore (lower δ 13 C), have different PFAS burdens. The absence of a statistical relationship between δ 13 C and PFOS/Σ 4 PFSAs across our species may reflect the ubiquitous nature of PFOS in the eastern North Pacific with multiple sources/exposure pathways, consequently homogenizing exposure and leading to a spatial averaging of PFAS bioaccumulation over the region …”

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

“…The absence of a statistical relationship between δ 13 C and PFOS/Σ 4 PFSAs across our species may reflect the ubiquitous nature of PFOS in the eastern North Pacific with multiple sources/exposure pathways, consequently homogenizing exposure and leading to a spatial averaging of PFAS bioaccumulation over the region. 61 Values for δ 13 C across species were also nonlinearly correlated with lnΣ 13 PFCAs (t 157 = −5.90; p < 0.001) and long-chain ΣPFASs (t 158 = −2.99; p < 0.01). Elliott et al found that δ 13 C values were negatively associated with PFUdA and PFTriDA (as well as polybrominated diphenyl ethers, hexachlorobenzene, and β-hexachlorocyclohexane) in rhinoceros auklet eggs collected from the same breeding colonies sampled in the present study, with PFTriDA levels slightly increasing with wintering latitude.…”

Section: Concentrations and Composition Profiles Of Pfassmentioning

confidence: 94%

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Perfluoroalkyl Substances in Seabird Eggs from Canada’s Pacific Coast: Temporal Trends (1973–2019) and Interspecific Patterns

Kesic

Elliott

et al. 2023

Environ. Sci. Technol.

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Whether perfluoroalkyl sulfonates (PFSAs) and perfluoroalkyl carboxylates (PFCAs) are responding to legislative restrictions and showing decreasing trends in top marine predators that range across the eastern North Pacific Ocean is unclear. Here, we examined longer-term temporal trends (1973−2019) of 4 PFSAs and 13 PFCAs, as well stable isotopes of δ 13 C and δ 15 N, in the eggs of 4 seabird species sampled along a nearshore-offshore gradient; double-crested cormorants (Nannopterum auritum), pelagic cormorants (Urile pelagicus), rhinoceros auklets (Cerorhinca monocerata), and Leach's storm-petrels (Hydrobates leucorhous) from the Pacific coast of British Columbia, Canada. PFOS was the most abundant PFSA (79−94%) detected in all eggs regardless of colony and year, with the highest concentrations, on average, measured in auklet eggs (mean = 58 ng g −1 , range = 11−286 ng g −1 ww). Perfluoroundecanoic acid (PFUdA) and perfluorotridecanoic acid (PFTriDA) were the dominant long-chain PFCAs (≥30% combined). The majority of PFSAs (including PFOS) are statistically declining (p < 0.001) in the eggs of all 4 species with PFOS half-lives ranging from 2.6 to 7.8 years. Concentrations of long-chain PFCAs exhibited a trajectory comprised of linear increases and second-order declines, suggesting that the rate of uptake of PFCAs is slowing or leveling off. These trends are consistent with the voluntarily ceased production of PFSAs by 3M circa 2000−2003 and are among the first from the northeast Pacific to indicate a positive response to several regulations and restrictions on PFCAs from facility emissions and product content.

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