Mercury accumulation,distribution,and isotopic composition in tissues of the Collared Scops Owl(Otus lettia)  

作　　者：Dongya Jia Kang Luo Zhidong Xu Xiaohang Xu Chan Li Hongmei Wu Dawei Wang Hui Ye Gaoen Wu Zhuo Chen Guangle Qiu 

机构地区：[1]School of Chemistry and Materials Science,Guizhou Normal University,Guiyang 550001,China [2]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [3]College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China [4]School of Ecology and Environmental Science,Yunnan University,Yunnan 650091,China [5]University of Chinese Academy of Sciences,Beijing 100049,China [6]School of Public Health,Guizhou Medical University,Guiyang 550025,China [7]College of Ecology and Environment,Hainan University,Hainan 570228,China

出　　处：《Acta Geochimica》2023年第4期637-647,共11页地球化学学报（英文）

基　　金：supported by National Natural Science Foundation of China(NSFC No.42103080)。

摘　　要：Mercury is a ubiquitous contaminant known to accumulate in wildlife,particularly bird species at higher trophic levels.Knowledge of tissue-specific Hg distributions aids our understanding of Hg bioaccumulation in organisms.In this study,one adult and three juvenile Collared Scops Owls(Otus lettia)were studied to elucidate the bioaccumulation of Hg in body tissues.Six tissues and organs(feathers,nails,heart,liver,gizzard,and muscle),as well as gastric contents,were examined for total Hg(THg)and methylmercury(MeHg)contents,Hg isotopic compositions including mass-dependent fractionation(MDF;δ202Hg)and mass-independent fractionation(MIF;Δ199Hg andΔ201Hg),and C(δ13C)and N(δ15N)isotopic compositions.Tissue-specific THg and MeHg concentrations in the adult were in the ranges of 150–1360 ng/g and17–1060 ng/g,and lower in the juveniles at 91–419 ng/g and 67–350 ng/g,respectively.Theδ^(202)Hg values in the adult were strongly negative at-1.75‰±0.17‰compared with the juveniles at-0.99‰±0.25‰.The adult exhibited lower MIF values than the juveniles,at0.23‰±0.07‰forΔ^(199)Hg and 0.2‰±0.11‰forΔ^(201)Hg,comparedwith0.81‰±0.09‰and0.66‰±0.07‰,respectively.The lower adult MDF and MIF values suggest that the adult tended to accumulate negative Hg isotopes but the juvenile's positive Hg isotopes.Differences between adult and juvenile tissue Hg concentrations indicate that metabolic processes play an important role in Hg accumulation.

关 键 词：MERCURY METHYLMERCURY Mass-dependent fractionation Mass-independent fractionation Tissue Terrestrial bird 

分 类 号：X503.224[环境科学与工程—环境工程]