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New records and distributions of two North American branchiobdellidan species (Annelida: Clitellata) from introduced signal crayfish, Pacifastacus leniusculus, in Japan.

Authors :
Akifumi Ohtaka
Stuart R. Gelder
Tadashi Kawai
Kazuhiro Saito
Kazuyoshi Nakata
Machiko Nishino
Source :
Biological Invasions; Mar2005, Vol. 7 Issue 2, p149-156, 8p
Publication Year :
2005

Abstract

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. [ABSTRACT FROM AUTHOR]

Subjects

Subjects :
CRAYFISH
CRUST of the earth

Details

Language :
English
ISSN :
13873547
Volume :
7
Issue :
2
Database :
Complementary Index
Journal :
Biological Invasions
Publication Type :
Academic Journal
Accession number :
18498207
Full Text :
https://doi.org/10.1007/s10530-004-8146-y