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heavy metal and selenium levels in feathers of young egrets and herons from hong kong and szechuan, china.several species of herons and egrets frequently nest in colonies in areas where humans also concentrate. since the birds feed on intermediate-sized fish that themselves concentrate pollutants, they can be used not only to assess the levels of contaminants in avian tissues but as indicators of contaminants in the environment. the concentration of heavy metals and selenium in the breast feathers of fledgling black-crowned night herons nycticorax nycticorax and chinese pond herons ardeola bacchus f ...19938215588
[mercury concentration and its distribution in nycticorax nycticorax and chinese ardeola bacchus fledglings at huangpu district of guangzhou city, china].in this study, live fledglings of nycticorax nycticorax and ardeola bacchus at the huangpu district of guangzhou city were collected, and their primary feather, breast feather, tail feather, liver, chest muscle and egg shell were sampled for mercury determination. the results showed that these two heron species had a very similar distribution pattern of mercury concentration in their tissues and organs, i. e., tail feather > breast and primary feather > liver > chest muscle > egg shell. ardeola ...200515852945
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