Abstract
Trace element concentrations in the diet can affect the levels in birds. Heron and egret chicks have been recommended as useful biological indicators for monitoring trace element contamination in the aquatic ecosystem. Iron, zinc, manganese, copper, lead and cadmium concentrations were measured in the livers and stomach contents of Grey Heron (Ardea cinerea), Intermediate Egret (Egretta intermedia), Little Egret (Egretta garzetta) and Black-crowned Night Heron (Nycticorax nycticorax) chicks from Pyeongtaek colony, Korea in 2008. Iron, zinc, manganese, copper and cadmium concentrations in livers differed among four heron and egret species. Stomach content concentrations of iron, zinc, copper, lead and cadmium concentrations differed among the four species. Essential elements such as iron, zinc, manganese and copper concentrations were within the range of other heron and egret studies and these levels may be regulated by a normal homeostatic mechanism. Two of 11 (18.2 %) Grey Heron and two of 10 (20.0 %) Black-crowned Night Heron chicks exceeded the background lead level (<6 µg/g dw) for birds and were at a level considered lead exposed (6–30 µg/g dw). Cadmium concentrations did not exceed the background levels for wild birds. In livers of combined heron and egret chicks, lead, but not cadmium concentrations were associated with concentrations in the stomach contents. These results suggest that lead concentrations in chicks can reflect qualities of feeding area such as streams, rivers and paddy fields and chicks represent a bioindicator to evaluate lead contamination in aquatic ecosystems.
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Acknowledgments
We are grateful on Thomas W. Custer (USGS) for a critical reading and comments of the manuscript. This work was supported by a grant from Kyung Hee University in 2014.
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The authors declare that they have no conflict of interest.
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Kim, J., Oh, JM. Effect of the environmental quality and food chain on trace element concentrations in Heron and Egret chicks at Pyeongtaek Colony, Korea. Ecotoxicology 23, 1305–1313 (2014). https://doi.org/10.1007/s10646-014-1273-z
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DOI: https://doi.org/10.1007/s10646-014-1273-z