| 要旨トップ | 本企画の概要 | 日本生態学会第72回全国大会 (2025年3月、札幌) 講演要旨
ESJ72 Abstract


シンポジウム S05-6  (Presentation in Symposium)

多様な魚の遡上が川の生態系を支える:回遊魚の「おしっこ」が川の生物の大切な栄養源【B】【O】
Sequential migrations of diverse fish community provide seasonally prolonged and stable nutrient inputs to a river【B】【O】

倉澤央(京都大学), 大西雄二(総合地球環境学研究所), 福島慶太郎(福島大学), 木庭啓介(京都大学), *宇野裕美(東北大学)
Akira KURASAWA(Kyoto Univ.), Yuji ONISHI(RIHN), Keitaro FUKUSHIMA(Fukushima Univ.), Keisuke KOBA(Kyoto Univ.), *Hiromi UNO(Tohoku Univ.)

Animal migrations transport resources among spatially separate ecosystems, effectively linking them. In freshwater ecosystems, numerous fish species migrate between mainstream rivers or lakes and their tributaries, providing resources and nutrients during their spawning migrations. Multiple migratory species travel to the same destinations and contribute such nutrients, but knowledge remains limited about how the diversity of migratory animals influences the recipient ecosystem. We investigated how migrations of diverse fish community from Lake Biwa, Japan contribute to nutrient inputs in one of the lake’s tributary rivers and how they influence the ecosystem. Sequential migration of six fish species continued for 8 months of a year, causing high-level nutrient concentration and primary production. The fish-derived resources were taken up by diverse members of the river community. Our results emphasize the extent to which migrations of diverse animals seasonally extend and stabilize the resource subsidy and how they extend pronounced effects on the recipient ecosystems.


日本生態学会