Janaydeh Mohammed, Ismail Ahmad, Omar Hishamuddin, Zulkifli Syaizwan Zahmir, Bejo Mohd Hair, Aziz Nor Azwady Abd
Department of Biology, Faculty of Science, University Putra Malaysia (UPM), 43400, Serdang, Selangor, Malaysia.
Department of Veterinary Pathology & Microbiology, Faculty of Veterinary Medicine, University Putra Malaysia (UPM), 43400, Serdang, Selangor, Malaysia.
Environ Monit Assess. 2017 Dec 27;190(1):47. doi: 10.1007/s10661-017-6416-2.
Heavy metal pollution has become a global concern due to accumulation in tissue and transferable effects to humans via the food chain. This study focused on monitoring the accumulation of cadmium (Cd) and lead (Pb) in surface soil and body content: bone, heart, brain, liver, lung, muscle, kidney, feathers, feces, and gizzard contents of house crow Corvus splendens in the Klang region, Malaysia. The results revealed the occurrence of Pb and Cd in all biological samples from house crows, food contents, and surface soil samples. Heart and kidney accrued high amounts of Cd, while high amounts of Pb were found to accumulate in bones and feathers. Major discrepancies were also discovered in the concentrations of metals between juvenile and adults, as well as female and male bird samples. Concentrations of Pb and Cd in house crow internal tissues correlated significantly with that of bird feathers, but none could be established with that of surface soil. In addition, a significant correlation was observed between Pb concentration in the internal tissues to that of the feces, but the same was not the case when compared with the surface soil concentration. Metal accrual in the house crows feathers and feces may be through a long-term transmission via the food chain, which are eliminated from feathers via molting. This may suggest the utility of molted breast feathers of house crow in the bio-monitoring of Cd and Pb contamination, whereas feces of house crow appear only to be suitable for the bio-monitoring of Pb contamination.
由于重金属在组织中的积累以及通过食物链对人类产生的转移性影响，重金属污染已成为全球关注的问题。本研究重点监测了马来西亚巴生地区家鸦（Corvus splendens）的表层土壤以及骨骼、心脏、大脑、肝脏、肺、肌肉、肾脏、羽毛、粪便和砂囊内容物等身体组织中镉（Cd）和铅（Pb）的积累情况。结果显示，在家鸦的所有生物样本、食物内容物和表层土壤样本中均检测到了铅和镉。心脏和肾脏积累了大量的镉，而骨骼和羽毛中则积累了大量的铅。在幼鸟和成鸟以及雌鸟和雄鸟样本之间的金属浓度也发现了显著差异。家鸦内部组织中的铅和镉浓度与鸟羽中的浓度显著相关，但与表层土壤中的浓度均未建立相关性。此外，内部组织中的铅浓度与粪便中的铅浓度之间存在显著相关性，但与表层土壤浓度相比则不然。家鸦羽毛和粪便中的金属积累可能是通过食物链的长期传递，这些金属通过换羽从羽毛中排出。这可能表明家鸦换羽后的胸羽可用于镉和铅污染的生物监测，而家鸦粪便似乎仅适用于铅污染的生物监测。
