Assessment of heavy metal pollution and exposure risk for migratory birds- A case study of Caohai wetland in Guizhou Plateau (China)

被引:29
|
作者
Xia, Pinhua [1 ]
Ma, Li [1 ]
Yi, Yin [2 ]
Lin, Tao [1 ]
机构
[1] Guizhou Normal Univ, Guizhou Key Lab Mountainous Environm Informat & E, Guiyang 550001, Peoples R China
[2] Guizhou Normal Univ, State Key Lab Southwest Karst Mt Biodivers Conser, Guiyang 550001, Peoples R China
基金
中国国家自然科学基金;
关键词
Heavy metal; Exposure risk; Waterbirds; Wetland; Model;
D O I
10.1016/j.envpol.2021.116564
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Increasing heavy metal pollution in wetland ecosystems around the world pose significant health risks to waterbirds, especially the endangered species. We analyzed heavy metal pollution in bird foraging area of Caohai wetland in Guizhou Plateau (China), and used an integrated exposure risk model for assessing heavy metal (Cd, Pb, Cr, Ni, Zn, Sb) exposure risk in birds from the soil, water, plants and benthic invertebrates. There is considerable variation in the extent of heavy metal contamination across the different sampling sites, and Cd and Sb are the main contaminants. The mussel Anodonta showed greater heavy metal accumulation (except for Zn) compared to the snail species C. cathayensis. The different plant species also varied in terms of amount for accumulated heavy metals. The phytophagous together with omnivorous birds were exposed to Cd, Pb, Zn and Ni through plants rather than the soil, whereas the maximum Zn exposure in the omnivorous and carnivorous birds was through consumption of benthic invertebrates. Furthermore, the phytophagous black-necked cranes (Grus nigricollis) were less risk to heavy metal exposure compared to the omnivorous bar-headed goose (Anser indicus) and carnivorous ruddy shelducks (Tadorna ferruginea). The exposure risk of Cr (8.1) was highest, followed by Pb (5.1), Zn (3.8), Sb (1.0), Cd (0.33) and Ni (0.28). The heavy metal assessment heavy metal exposure risk for migratory birds should take into account the exposure from food and soil. Our findings provide new insights into developing measures to minimize heavy metal contamination in migratory birds. (C) 2021 Elsevier Ltd. All rights reserved.
引用
收藏
页数:9
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