Abstract Waterbirds are used as a bioindicator for analyzing wetland health because they are very sensitive to changes in ecosystems at the nutrient level and through exposure to pollutants. In the present study, bioaccumulation of trace elements (Cu, Zn, Ni, Pb, Co, Cd, and Mn) was investigated in Common Coot Fulica atra, Gadwall Anas strepera, and Eurasian Teal Anas crecca at Taunsa barrage and Chashma barrage located on Indus River, Punjab, Pakistan. Samples of water, sediments, and waterbirds tissues were collected during autumn 2018 and the spring of 2019. Metal concentrations were assessed by using a flame atomic absorption spectrophotometer (Thermo Scientific iCE 3000 Series). We found that the maximum bioaccumulation in birds was of cadmium. Order of metal accumulation was Cd > Pb > Zn > Co > Mn > Cu > Ni (Common Coot) and Cd > Pb > Zn > Co > Cu > Ni > Mn (Gadwall and Eurasian Teal) at Taunsa barrage. At Chashma barrage metal accumulation order was Cd > Zn > Pb > Co > Cu > Mn > Ni (Common Coot), Cd > Zn > Pb > Cu > Co > Ni > Mn (Gadwall) and Cd > Zn > Pb > Co > Cu > Ni > Mn (Eurasian Teal). A. crecca was the species in which the most of the trace elements (Cu, Ni, Pb, Co, and Mn) were accumulated at Taunsa barrage, while at Chashma barrage Zn, Pb, Cd, and Co accumulated in F. atra. Zn, Pb and Cd (avg. > 10) had a high bioaccumulation ratio and Co, Cu, Ni, and Mn (avg. < 10) had low bioaccumulation ratio. When tissues were compared for accumulation, the highest concentrations were observed in the intestine followed by gizzard, probably because of the feeding habits of these waterbirds.

中文翻译：

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印度河两湿地迁徙水鸟中微量元素的生物富集

摘要 水鸟被用作分析湿地健康的生物指标，因为它们对生态系统在营养水平和暴露于污染物中的变化非常敏感。在本研究中，研究了位于 Taunsa 拦河坝和 Chashma 拦河坝的 Common Coot Fulica atra、Gadwall Anas strepera 和欧亚蓝鸭 Anas crecca 中的微量元素（Cu、Zn、Ni、Pb、Co、Cd 和 Mn）的生物积累。印度河，旁遮普省，巴基斯坦。在 2018 年秋季和 2019 年春季期间收集了水、沉积物和水鸟组织的样本。使用火焰原子吸收分光光度计（Thermo Scientific iCE 3000 系列）评估了金属浓度。我们发现鸟类中最大的生物蓄积是镉。金属积累的顺序是Cd＞；铅＞锌＞钴 锰＞铜＞Ni (Common Coot) 和 Cd > 铅＞锌＞钴 铜＞镍＞Taunsa 拦河坝的 Mn（Gadwall 和欧亚蓝绿色）。在 Chashma 拦河坝，金属堆积顺序是 Cd > 锌＞铅＞钴 铜＞锰＞Ni（普通 Coot）、Cd > 锌＞铅＞铜＞钴 镍＞Mn (Gadwall) 和 Cd > 锌＞铅＞钴 铜＞镍＞锰（欧亚蓝绿色）。A. crecca 是其中微量元素（Cu、Ni、Pb、Co 和 Mn）在 Taunsa 拦河坝积累最多的物种，而在 Chashma 拦河坝 Zn、Pb、Cd 和 Co 在 F. atra 中积累。Zn、Pb和Cd（平均＞10）具有高生物累积率，而Co、Cu、Ni和Mn（平均＜10）具有低生物累积率。