Relationship between the impact of invasive largemouth bass and environmental conditions in ponds (Proceedings of the 14th International Symposium on River and Lake Environments (ISRLE2009))

Abstract: To detemine the relationship between the impact of introdllCed largemouth bass on native -fish fauna and the environmental conditions in ponds, we compared richness and diversityof fish species, environmental factors and the relationship betweenthem in ponds with and without bass. The stlldy was conducted at 49 Ponds in Oshu city in lwate prefecture, northeastern Japan・ For determiningthe impact of largemouth bass on fish fauna in ponds, Pearson's correlation wasused between the dominance of largemouth bass (%BASS), total number (S) and diversity index (H') of occurring fish species. Furthermore, multiple regression analysis was used to detemine the relationship between S or HT and environmental factors・ %BASS was negatively correlated with both S and H'. In ponds without bass, both S and H'were`related to maximum depth and S in ponds with bass was also related to maximum depth. However, I-r in ponds withbass was significantly

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