Heavy metal contamination status of Japanese cranes (Grus japonensis) in east Hokkaido, Japan - Extensive mercury pollution

Hiroki Teraoka, Yoshihiro Kumagai, Hisae Iwai, Kensaku Haraguchi, Takashi Ohba, Kunihiko Nakai, Hiroshi Satoh, Mineshi Sakamoto, Kunikazu Momose, Hiroyuki Masatomi, Takeo Hiraga

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Japanese cranes (Grus japonensis) of eastern Hokkaido, Japan, and migrants between the Amur River basin and the eastern China-Korea Peninsula, live around fresh and brackish wetlands. Only a few thousand cranes are confirmed to exist in the world, so they are under threat of extinction. To understand the adverse effects of metal accumulation, we measured concentrations of three heavy metals in the liver, kidney, and muscle of 93 Japanese cranes from Hokkaido. The cranes were classified into six categories according to their sex and three life stages. Cadmium and mercury (Hg: total mercury) showed age-dependent but not sex-dependent accumulation in the liver and kidney. Twenty cranes showed 30 μg/g or higher levels of Hg in dry tissue and five adult cranes had more than 100 μg/g in their livers or kidneys. Cadmium concentrations were generally lower in all samples. Two adult cranes showed extremely high lead levels of more than 30 μg/g in their livers, suggesting lead poisoning. These results have highlighted the widespread and high levels of Hg pollution in Japanese cranes in Hokkaido, Japan.

Original languageEnglish
Pages (from-to)307-312
Number of pages6
JournalEnvironmental Toxicology and Chemistry
Volume26
Issue number2
DOIs
Publication statusPublished - 2007 Feb

Keywords

  • Cadmium
  • Gruinae
  • Japanese crane
  • Lead
  • Mercury

ASJC Scopus subject areas

  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis

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