Stream drift feeding and microhabitat competition of invasive smallmouth bass Micropterus dolomieu, native Japanese dace Tribolodon hakonensis and pale chub Opsariichthys platypus in the Nogu River, Japan
Foraging behavior and microhabitat use of native Japanese dace, pale chub, and invasive smallmouth bass were studied in the Nogu River, Nagano, Japan. Chub, dace and smallmouth bass all used drift feeding as their dominant foraging behavior. Chub drift fed most frequently, followed by dace, and smallmouth bass drift fed significantly less frequently than both native species. Chub and dace utilized microhabitat that had significantly higher flow velocity than smallmouth bass. However, smaller chub and dace were found in areas with lower flow velocity compared to larger individuals. Prey resource competition between smallmouth bass and native cyprinids, especially smaller individuals, is suspected due to similar feeding methods and microhabitat use.
KeywordsInterspecific competition Foraging method Foraging rate Smallmouth bass Cyprinids Invasion
We thank the Hokuan-Chubu Fisheries Cooperation for their agreement to allow observation and sampling of fish in the Nogu River. We are grateful to Narumi Kohno and Yoshihiro Sawamoto (Nagano Prefecture Fisheries Experimental Station) for their advice and helpful background information. We are grateful to Hideyuki Ida for his advice in statistical analysis, and Kurt Fausch and Taiga Yodo for their helpful comments. We are also grateful for the detailed comments provided by two anonymous reviews. This project was funded by the Japanese Ministry of Land, Infrastructure, Transport, and Tourism.
Compliance with ethical standards
All applicable international, national, and/or institutional guidelines for the care and use of animals were followed (IACUC protocol No. Y72A01–1-102).
Conflict of interest
The authors declare that they have no conflict of interest.
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