中文摘要：

2005年5月，采集了淮河地区颍上八里河集群繁殖的夜鹭（Nycticorax nycticorax）和小白鹭（Egretta garzetta）鸟卵共18枚，用原子吸收法测定了卵壳、内容物中重金属Cd、Pb、Cr的残留量。结果表明，所有卵壳样品中均检出一定水平的Cd、Pb和Cr残留量，夜鹭卵壳中重金属残留量为Pb〉Cr〉Cd，小白鹭卵壳中重金属残留量为Cr〉Pb〉Cd，卵壳中Pb和Cr残留量的种间差异都不显著，但Cd的种间差异显著；在2种鹭卵内容物中，Cr都被检出，在夜鹭卵内容物样品中，Pb只被部分检出，Cd在2种鹭卵内容物样品中都没有被检出，3种重金属在内容物中残留量的种间差异都不显著。2种鹭卵壳中Pb和Cd残留量极其显著地高于卵内容物，但Cr的这种残留分布上的差异不显著。本研究进一步证明卵壳可用作重金属污染物的指示物，监测和评价湿地生态系统中重金属的污染状况。

英文摘要：

Eggs of Black-crowned Night Heron （Nycticorax nycticorax ） and Little Egret （Egretta garzetta ） were sampled in May of 2005 from Yingshang Balihe Reserve, Anhui Province. Residues of Cd, Pb and Cr were determined by atomic absorption spectrophotometer analysis. Results show that heavy metals could be detected in all eggshell samples. The residues of heavy metals in eggshells of Black-crowned Night Heron ranks as Pb 〉 Cr 〉 Cd, but in Little Egret as Cr 〉 Pb 〉 Cd. Interspecies differences of the residues of Cd are significant; however Pb and Cr are not. In egg contents, Cr was detected in all samples, and Pb was detected in some of the samples, but Cd was not detected in any samples. Interspecies differences of the residues of the three heavy metals are significant. There are significantly higher residues of Pb and Cd in eggshells than in egg contents. However, there are no significant differences of Cr residues between in egg contents and eggshells. This study indicates again that eggshells could be used as an indicator to assess the pollution conditions of wetlands.