Change of fish fauna in ponds after eradication of invasive piscivorous largemouth bass,Micropterus salmoides,in north‐eastern Japan |
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Authors: | Hiroshi Tsunoda Yoshito Mitsuo Mitsuru Ohira Makie Doi Yutaro Senga |
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Affiliation: | 1. Faculty of Agriculture, Tokyo University of Agriculture and Technology, 3‐5‐8 Saiwai‐cho, Fuchu, Tokyo 183‐8509, Japan;2. Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3‐5‐8 Saiwai‐cho, Fuchu, Tokyo 183‐8509, Japan;3. Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology, 3‐5‐8 Saiwai‐cho, Fuchu, Tokyo 183‐8509, Japan |
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Abstract: | - 1. The change in fish fauna was monitored in ponds within irrigation systems in Iwate prefecture, north‐eastern Japan to evaluate the effectiveness of eradicating the invasive piscivorous largemouth bass, Micropterus salmoides.
- 2. Eleven study ponds were categorized into three pond groups: bass‐dwelling (n=3), bass‐eradicated (n=3) and non‐invaded ponds (n=5).
- 3. Species richness and diversity, which temporally decreased in bass‐dwelling ponds, increased in bass‐eradicated ponds. Furthermore, in bass‐eradicated ponds, the mean numbers of topmouth minnow and freshwater goby were gradually restored, but in bass‐dwelling ponds the numbers decreased and both species eventually disappeared.
- 4. Although the eradication of piscivorous invaders is helpful for restoring fish species diversity in ponds, its effectiveness varies among species, and other alien fish such as the rose bitterling (Rhodeus ocellatus ocellatus) often invade and proliferate in the bass‐eradicated ponds.
- 5. To ensure successful restoration of native biota and avoid undesirable results, it is necessary to plan and implement continuous monitoring and adaptive management after eradication of alien predators. Copyright © 2010 John Wiley & Sons, Ltd.
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Keywords: | largemouth bass invasive alien species fish fauna eradication non‐target invader north‐eastern Japan pond irrigation system |
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