Risk analysis of habitat utilization by bluegill (Lepomis macrochirus) in the Lake Biwa Basin

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  • 琵琶湖流域におけるブルーギル(Lepomis macrochirus)の生息リスク評価
  • ビワコ リュウイキ ニ オケル ブルーギル Lepomis macrochirus ノ セイソク リスク ヒョウカ

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The indigenous fishes of the Lake Biwa Basin, including endemic species that have arisen during the lake's 4 million year history, are now experiencing rapid declines in abundance. The introduced bluegill sunfish, Lepomis macrochirus, is a major factor contributing to the declines of native species. In line with recent legislation to regulate introduced species in Japan, and in particular to reduce the prevalence of bluegill in this and other water bodies, studies are needed to assess its risk of habitat utilization. However, there has been no catchment-scale assessment of bluegill habitat preferences in Japan. In this study, we evaluated the risk of habitat utilization by bluegill in the Lake Biwa Basin (including the Seta River and the Daido River) using logistic analysis. We used data on freshwater fish occurrence and habitat conditions from 2814 sites that were collected over 7 years by the Lake Biwa Museum Fish Survey Group. There were 14 environmental and temporal factors that significantly affected the risk of habitat utilization by bluegill. For example, the risk of habitat utilization by bluegill was 2.5 times greater in water deeper than 90 cm than it was in shallower places, and the risk in water shallower than 30 cm was 20% of that in areas deeper than 30 cm.

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