Accumulation properties of inorganic mercury and organic mercury in the red-crowned crane Grus japonensis in east Hokkaido, Japan.
Accumulation properties of inorganic mercury and organic mercury in the red-crowned crane Grus japonensis in east Hokkaido, Japan.
复制标题
日本北海道东部丹顶鹤体内无机汞和有机汞的富集特性。
DOI：
10.1016/j.ecoenv.2015.09.025
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Hiraga T.
中科院分区：
文献类型：
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作者：
Teraoka H;Okamoto E;Kudo M;Nakayama SM;Ikenaka Y;Ishizuka M;Endo T;Kitazawa T;Hiraga T.
丹顶鹤（日本）丹顶鹤原产于日本北海道东部，与东亚大陆形成对比。之前，我们曾报道过北海道的丹顶鹤在20世纪90年代受到高度汞污染，21世纪初污染迅速下降到中等水平。在本研究中，我们测定了北海道东部鹤肝脏和肾脏中的有机汞（O-Hg）水平，并与总汞（T-Hg）水平进行了比较。在肾脏中的总汞水平高于那些在肝脏中的成年人，但不是在亚成体和青少年;然而，相反的情况下，即使是成年人的O-Hg。随着总汞含量的增加，肝脏和肾脏中O-Hg/T-Hg的比值逐渐降低。虽然O-Hg的比值T-Hg在肝脏和肾脏的成年人显着低于那些少年，成年人和少年的比值是相似的T-Hg的较低范围。硒（Se）与总汞的比值下降，总汞增加，在肝脏和肾脏，不分阶段。幼鱼和成鱼羽毛中的汞含量分别约占总汞含量的59%和67%。此外，碳和氮稳定同位素的比值T-Hg变化很大，与汞在肝脏中的水平没有关系。研究结果表明，无机汞在日本北海道东部丹顶鹤肾脏中有缓慢积累。
The red-crowned (Japanese) craneGrus japonensisis native to east Hokkaido, Japan, in contrast to the East Asia mainland. Previously, we reported that red-crowned cranes in Hokkaido were highly contaminated with mercury in the 1990s and that the contamination rapidly decreased to a moderate level in the 2000s. In the present study, we determined levels of organic mercury (O–Hg) in the liver and kidney of cranes in east Hokkaido in comparison with levels of total mercury (T–Hg). T–Hg levels in the kidneys were higher than those in the livers in adults but not in subadults and juveniles; however, the reverse was the case for O–Hg even for adults. The ratio of O–Hg to T–Hg in both the liver and kidney decreased as T–Hg increased in the three developmental stages. While the ratios of O–Hg to T–Hg in the liver and kidney of adults were significantly lower than those of juveniles, the ratios were similar for adults and juveniles in a lower range of T–Hg. The ratio of selenium (Se) to T–Hg decreased as T–Hg increased in both the liver and kidney, irrespective of stages. Mercury burdens in feathers were about 59% and 67% of the total body burdens for juveniles and adults, respectively. Furthermore, ratios of carbon and nitrogen stable isotopes to T–Hg varied greatly, with no relation to mercury level in the liver. The results suggest slow accumulation of inorganic mercury in the kidney of red-crowned cranes in east Hokkaido, Japan.