Replacement of nonnative rainbow trout by nonnative brown trout in the Chitose River system, Hokkaido, northern Japan

In this study, evidence for interspecific interaction was provided by comparing distribution patterns of nonnative rainbow trout Onchorhynchus mykiss and brown trout Salmo trutta between the past and present in the Chitose River system, Hokkaido, northern Japan. O. mykiss was first introduced in 192...

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Bibliographic Details
Published inAquatic invasions Vol. 9; no. 2; pp. 221 - 226
Main Author Hasegawa, Koh
Format Journal Article
LanguageEnglish
Published 01.06.2014
Subjects
Freshwater
Oncorhynchus mykiss
Salmo trutta
Japan, Hokkaido, Ishikari District, Chitose R
Japan, Hokkaido
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Summary:In this study, evidence for interspecific interaction was provided by comparing distribution patterns of nonnative rainbow trout Onchorhynchus mykiss and brown trout Salmo trutta between the past and present in the Chitose River system, Hokkaido, northern Japan. O. mykiss was first introduced in 1920 in the Chitose River system and has since successfully established a population. Subsequently, another nonnative salmonid species, S. trutta have expanded the Chitose River system since the early 1980s. At present, S. trutta have replaced O. mykiss in the majority of the Chitose River, although O. mykiss have persisted in areas above migration barriers that prevent S. trutta expansion. In conclusion, the results of this study highlight the role of interspecific interactions between sympatric normative species on the establishment and persistence of populations of nonnative species.
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ISSN:1818-5487
1798-6540
1818-5487
DOI:10.3391/ai.2014.9.2.11