Abstract
Concentrations of ten trace elements (Hg, As, Cd, Pb, Co, Cr, Cu, Ni, Se and Zn) were determined in different tissues (liver, kidney, muscle, heart and brain) of African sacred ibis (Threskiornis aethiopicus), Hamerkop (Scopus umbretta), marabou stork (Leptoptilos crumeniferus) and great white pelican (Pelecanus onocrotalus) inhabiting the Ethiopian Rift Valley region. There were differences in trace element patterns among the bird species. Significantly (p < 0.05) higher concentrations of Cd (5.53 µg/g dw ± 2.94) in kidney and Hg (0.75 µg/g ww ± 0.30) in liver were observed in the great white pelican compared to the other species, and liver concentrations of these two elements showed positive correlations with trophic level. Concentrations of toxic elements (As, Cd, Pb and Hg) in liver were below their respective toxicological thresholds, indicating that the data may provide baseline information for future studies.
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Acknowledgements
This study was supported by a Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science, and Technology of Japan awarded to M. Ishizuka (No. 16H01779, Core to Core), Y. Ikenaka (No. 26304043) and S. Nakayama (No. 16K16197). We would also like to acknowledge the financial support of the Soroptimist Japan Foundation and the Nakajima Foundation. The authors are grateful to EWCA senior experts, Mr. Yeneneh Teka and Dr. Fekede Regassa, for their assistance with bird sampling. We also appreciate Mr. Lemma Abera for his kind help during sampling, as well as Mr. Takahiro Ichise for his technical input.
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Yohannes, Y.B., Ikenaka, Y., Nakayama, S.M.M. et al. Trace Element Contamination in Tissues of Four Bird Species from the Rift Valley Region, Ethiopia. Bull Environ Contam Toxicol 98, 172–177 (2017). https://doi.org/10.1007/s00128-016-2011-4
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DOI: https://doi.org/10.1007/s00128-016-2011-4