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Metal content in the liver, kidney, and feathers of Northern gannets, Morus bassanus, sampled on the Spanish coast

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Abstract

The value of birds as bioindicators for monitoring the environmental inorganic elements has been globally recognized. In this context, due to its well-known ecology and population stability, the Northern gannet (Morus bassanus) could be particularly useful. Dead Northern gannets (n = 30) were collected and samples from the liver, kidney, and feathers were taken, dried, mineralized, and finally analyzed via ICP-MS. Metals and metalloids, namely As, Cd, Hg, Pb, and Zn, associated with environmental pollution and toxicity on living organisms, were evaluated. The mean highest concentrations of As, Hg, and Zn were found in the liver (0.916, 7.026, and 89.81 mg/kg dry weight, respectively). For Cd, the kidney showed the highest mean concentration (17.51 mg/kg dry weight), whereas for Pb, this value corresponded to the feathers (0.399 mg/kg dry weight). Significant differences were found between the age classes in terms of contaminant concentrations, with the adults exhibiting higher metal levels. This difference was significantly relevant for Pb and Hg, where the effect of age was observed for all the considered tissues. When considering the effect of gender, no significant differences were observed, in agreement with similar studies performed in other geographical regions. Finally, positive correlations between the concentrations of Hg and Pb in the feathers and in the liver (r = 0.688, p < 0.001 and r = 0.566, p < 0.001, respectively) were observed, as well as between the feather and kidney concentrations (r = 0.685, p < 0.001) indicating the possibility to use feathers, a non-invasive biomonitoring tissue, for better understanding Hg and Pb exposure in seabirds.

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Acknowledgements

The authors wish to thank to the Wildlife Recovery Centers from Galicia, and to Dirección Xeral de Patrimonio Natural (Consellería de Medio Ambiente e Ordenación do Territorio, Xunta de Galicia), for authorizing the use and transfer of corpses/specimens of wild fauna.

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Correspondence to Marcos Pérez-López.

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Responsible editor: Severine Le Faucheur

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Nardiello, V., Fidalgo, L.E., López-Beceiro, A. et al. Metal content in the liver, kidney, and feathers of Northern gannets, Morus bassanus, sampled on the Spanish coast. Environ Sci Pollut Res 26, 19646–19654 (2019). https://doi.org/10.1007/s11356-019-05356-y

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  • DOI: https://doi.org/10.1007/s11356-019-05356-y

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