小浜および豊岡において死亡したコウノトリの残留水銀の分析結果

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  • Analytical Results of Residual Mercury in the Japanese Storks, Ciconia ciconia boyciana SWINHOE, which Died at Obama and Toyooka Regions
  • オバマ オヨビ トヨオカ ニ オイテ シボウ シタ コウノトリ ノ ザンリュウ スイギン ノ ブンセキ ケッカ

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Total chlorine, total phosphorus and total mercury contents in the five Japanese storks, Ciconia ciconia boyciana SWINHOE, which died between 1965 and 1966 at Obama (Fukui Pref.) and Toyooka (Hyogo Pref.) were determined by VOLHARD'S method, vanadomolybdate method and dithizone (column) chromatographic method, respectively. Total mercury contents in the 'dojo' fish, Misgurnus anguillicaudatus CANTOR, the catfish, Parasilurus asotus L. and the crucians, Carassius carassius L. which had been given to the birds as diets during rearing at Toyooka were also determined. The results were obtained that significant amounts of mercury were found in these birds, especially : the maximum values being 98.6 ppm in kidney, 61.5 ppm in liver and 21.5 ppm in feather, while 2.1 ppm in liver and 1.4 ppm in feather in the control little egret (normal adult), Egretta garzetta garzetta L. Small amounts of mercury (below 0.3 ppm) were also found in their diets. The chlorine and phosphorus contents in their organs were not considered to be so significant as to cause their death. However, thinking the mercury amounts accumulated in each bird, whatever direct cause of their death might be, it was highly possible that they died of chronic poisoning by mercury in diets taken for a long period.

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