A Case of Leech Parasitism among Waterfowl with Protruded Eyeballs in Azumino, Nagano, Pref., Japan

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  • 長野県安曇野市の水鳥に見られた眼球突出を伴うヒル寄生例
  • ナガノケン アズミノシ ノ スイチョウ ニ ミラレタ ガンキュウ トッシュツ オ トモナウ ヒル キセイレイ

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Abstract

<p>Over the past five years since 2010, waterfowl individuals with protruded eyeballs were observed within an overwintering population at Saigawa River in Azumino City, Nagano Prefecture, Japan. From the protruded eyeballs in an individual of the tundra swan Cygnus columbianus, a leech specimen in the genus Theromyzon. （Annelida, Hirudinea）was collected； the digestive tract of the leech contained blood including avian erythrocytes. Due to the poor condition of the specimen, however, it was not identified down to the species level, although other specimens from the waterfowls’ roost pond were positively confirmed to be T. tessulatum. The waterfowl eyeball protrution can be mainly caused by T. tessulatum parasitism.</p>

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