著者

久保 星 福岡 太一 太田 真人 遊磨 正秀

出版者

一般社団法人 日本魚類学会

雑誌

魚類学雑誌 (ISSN:00215090)

巻号頁・発行日

pp.20-031, (Released:2021-12-30)

参考文献数

28

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Food habits of young-of-the-year (YOY) smallmouth bass (Micropterus dolomieu) were surveyed from late June to early August, 2019 in the lower Kizu River, Kyoto Prefecture, Japan, prey importance being evaluated using the Index of Relative Importance (IRI). Stomach content analyses of 83 individuals revealed that unidentified fishes (%IRI: 36.6 %) and mayflies (Baetis spp.) (%IRI: 34.6 %) were important prey items, with YOY smallmouth bass as small as 10–20 mm in standard length preying on fishes. The onset of piscivory at an early life stage, likely resulting in higher predator growth rates and lower winter mortality, may have aided the establishment of M. dolomieu in the Kizu River.

著者

福岡 太一 田邑 龍 大庭 伸也 遊磨 正秀

出版者

一般社団法人 日本昆虫学会

雑誌

昆蟲.ニューシリーズ (ISSN:13438794)

巻号頁・発行日

vol.25, no.1, pp.14-17, 2022-03-25 (Released:2022-03-25)

参考文献数

18

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Appasus japonicus (Heteroptera: Belostomatidae) inhabits paddy fields and ponds. Females lay eggs on the dorsal surface of the male’s body; males then care for the egg mass. The predation risk for Belostomatinae males may increase because their swimming ability is compromised while caring for the egg masses. However, there are currently no records of predators of these males and the eggs in their care. In this study, we observed the capture of the egg mass of A. japonicus by Cybister tripunctatus lateralis (Coleoptera: Dytiscidae) larva in the field. This may be the first record of Dytiscidae larvae feeding on A. japonicus egg masses, suggesting that these larvae may exert predation pressure on A. japonicus individuals that care for the egg mass.

著者

福岡 太一

出版者

日本環境動物昆虫学会

雑誌

環動昆 (ISSN:09154698)

巻号頁・発行日

vol.32, no.1, pp.1-7, 2021 (Released:2021-05-26)