New records and distributions of two North American branchiobdellidan species (Annelida: Clitellata) from introduced signal crayfish, Pacifastacus leniusculus, in Japan |
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Authors: | Akifumi?Ohtaka author-information" > author-information__contact u-icon-before" > mailto:ohtaka@cc.hirosaki-u.ac.jp" title=" ohtaka@cc.hirosaki-u.ac.jp" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,Stuart?R.?Gelder,Tadashi?Kawai,Kazuhiro?Saito,Kazuyoshi?Nakata,Machiko?Nishino |
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Affiliation: | (1) Department of Natural Science, Faculty of Education, Hirosaki University, 1 Bunkyo-cho, Hirosaki 036-8560, Japan;(2) Department of Science, University of Maine at Presque Isle, 181 Main Street, Presque Isle, Maine 04769-2888, USA;(3) Hokkaido Nuclear-Energy Environmental Research Center, 261-1 Miyaoka, Kyowa Hokkaido, 045-0123, Japan;(4) Faculty of Economy, Asahikawa University, 3-23 Nagayama, Asahikawa 079-8501, Japan;(5) Laboratory of Marine Biodiversity, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate 041-8611, Japan;(6) Lake Biwa Research Institute, 1-10 Uchiide-hama, Otsu 520-0806, Japan |
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Abstract: | This is the first report of two North American branchiobdellidans, Sathodrilus attenuatus Holt, 1981, and Xironogiton victoriensis Gelder and Hall, 1990, on the signal crayfish, Pacifastacus leniusculus (Dana, 1852) introduced into Japan from the Columbia River system, northwestern North America. Signal crayfish from 12 localities in eastern and northern Hokkaido, Japan, were examined and each supported S. attenuatus. In addition, an individual of this species was found on preserved material from Ishikawa Prefecture, central Honshu. All of these branchiobdellidans reported in Hokkaido most probably came from the original population of signal crayfish introduced into Lake Mashu, Hokkaido, Japan, in 1930. It is suggested that the use of non-pathogenic branchiobdellidans, when present, provides an easy method for tracing the spread of crayfishes around Japan and could also be applied in other countries and continents. Specimens of X. victoriensis were only found on crayfish in a stream at Akashina in Nagano Prefecture, central Honshu, Japan. Although the signal crayfish appears to be displacing the endemic Japanese crayfish, C. japonicus, no native branchiobdellidans were found on any of the introduced signal crayfish examined. |
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Keywords: | Branchiobdellida ectosymbionts introduced species Japan Pacifastacus leniusculus Sathodrilus attenuatus Xironogiton victoriensis |
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