广州黄埔区夜鹭和池鹭体内汞浓度和分布特性

1　引　　言许多研究表明,汞是能在食物链中富集的重金属[2].汞对鸟类的危害受到广泛的关注,Sundlof等[12]学者指出,全球涉禽种群减少的部分原因可能是汞中毒.鸟类从食物中摄取的汞在体内组织中富集.在鸟的生长过程中,体内富集的汞释放入羽毛中,鸟类通过定期的换羽把汞排出体外.汞进入羽毛后牢固地与羽毛中的角蛋白结合,其生理和化学过程比较稳定,所以汞在羽毛中的浓度最高.有研究表明,博氏鸥(Larusphiladelphia)成鸟体内93%的汞存留在羽毛中,黑鸢(Milvusmigrans)体内70%的汞在羽毛中[1,9].羽毛中汞的浓度与鸟体内组织中汞浓度相关[4].其…

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 bacchus had higher levels of mercury in all its tissues than Nycticorax nycticorax.There were significant interspecific differences in mercury level for breast feather and primary feather.Because the collection of breast feather is easier and not harmful to birds,it is better to use it rather than primary or tail feather to monitor environmental pollution.The mercury level in breast feather was ten times higher than that in liver,lower than that in tail feather,but not significantly different to that in primary feather.The mercury concentrations in the tissues of Nycticorax nycticorax and Ardeola bacchus from Huangpu District of Guangzhou were similar to those from the suburbs of Chengdu,Sichuan Province,but lower than those from Taihu Lake,Jiangsu Province and higher than those from Hong Kong.