Seven species of the order Anseriformes (Mergus merganser, Melanitta nigra, Anas platyrhynchos, A. crecca, Aix galericulata, Cygnus bewickii, and C. cygnus), collected in Hokkaido, Japan, were examined helminthologically in order to obtain parasitic nematodes. A total of five nematode species was obtained. These were: Pseudocapillaria mergi (from A. crecca and C. cygnus), Contracaecum sp. (from M. merganser), Amidostomum anseris (from A. platyrhynchos, C. bewickii and C. cygnus), Tetrameres fissispina (from A. platyrhynchos), and Physaloptera sp. (from A. crecca). The records of both P. mergi and A. anseris were the first from Japan, while the records of T. fissispina and Physaloptera sp. involved new hosts. Among these five from Japan, while the records of T. fissispina and Physaloptera sp. involved new hosts. Among these five nematodes, A. anseris seems to be one of the most common occurring among the Anatidae of Hokkaido. カモ目の寄生線虫相を明らかにする目的で,北海道内の野生から採集されたカワアイサMergus merganser,クロガモMelanitta nigra,マガモAnas platyrhynchos,コガモA. crecca,オシドリAix galericulata,コハクチョウCygnus bewickiiおよびオオハクチョウC. cygnusの消化管を検索した。その結果,Pseudocapillaria mergi(宿主:コガモ,オオハクチョウ),Contracaecum sp.(宿主:カワアイサ),Amidostomum anseris(宿主:マガモ,コハクチョウ,オオハクチョウ),Tetrameres fissispina(宿主:マガモ)およびPhysaloptera sp.(宿主:コガモ)の5種の線虫が検出された。P. mergiとA. anserisは日本初記録,T. fissispinaとPhysaloptera sp.はそれぞれの宿主種で初めての記載であった。また,道内で広範に分布すること,および宿主域が広いことから,A. anserisはカモ目に普通の寄生虫であることが示唆された。
New Records of Parasitic Nematodes from Five Species of the Order Anseriformes in Hokkaido, Japan
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