2026-03-05T16:54:56Z https://fra.repo.nii.ac.jp/oai

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Fine-scale spatial distribution of a fish community in artificial reefs investigated using an underwater drone and environmental DNA analysis 40737318 Taga, Yuko 多賀, 悠子 タガ, ユウコ Taga 多賀 タガ Yuko 悠子 ユウコ 10805865 0000-0002-4755-3265 Sato, Masaaki 佐藤, 允昭 サトウ, マサアキ Sato 佐藤 サトウ Masaaki 允昭 マサアキ 40882600 Oi, Kuniaki 大井, 邦昭 オオイ, クニアキ Oi 大井 オオイ Kuniaki 邦昭 クニアキ 70588243 0000-0001-5916-8797 Furuichi, Naoki 古市, 尚基 フルイチ, ナオキ Furuichi 古市 フルイチ Naoki 尚基 ナオキ 50713880 Inoue, Nariaki 井上, 誠章 イノウエ, ナリアキ Inoue 井上 イノウエ Nariaki 誠章 ナリアキ High-rise artificial reefs ; Underwater drone ; Quantitative environmental DNA metabarcoding ; Distribution ; Species richness ; Remotely operated vehicle Although artificial reef (AR) effect evaluation is useful for planning the installation of high-rise ARs and their management, few studies have investigated them quantitatively. The fine-scale 2-dimensional fish distribution in ARs was estimated regarding current fields and vertical structures of 2 high-rise ARs (20 and 30 m high at 62 and 72 m depths, respectively) in Tateyama Bay, central Japan, using underwater drone recordings with vertical line transects and environmental DNA (eDNA) metabarcoding. The species detected by video surveys (21 taxa were identified to species, and 1 to genus) were fewer than by eDNA analysis (103 species and 6 genera), especially for pelagic, small-sized, and cryptic fish. Video surveys revealed that demersal fish increased with decreasing horizontal distance from the AR surface within 20 m, and the richness and total fish density were significantly higher upstream of the ARs. Conversely, the fish eDNA concentration showed different patterns, with significantly higher concentrations downstream of the ARs. The richness peaked at horizontal AR surfaces (e.g. reef top), but density of the dominant species peaked near the bottom by video survey. In comparison, eDNA analysis indicated lower richness and higher eDNA concentration of the dominant species at the reef top. Such discrepancies may be explained by the influence of eDNA transport or its specific behavior or buoyancy. Video surveys revealed the growth stage and sex information of 4 species from their morphology, which is not possible using eDNA analysis. This study shows that the advantages of each evaluation method can complement each other. Inter Research Science Publisher 2024-07-25 eng journal article SMUR https://fra.repo.nii.ac.jp/records/2013226 10.3354/meps14631 24341001 水産技術研究所 環境・応用部門 水産工学部 (神栖） https://www.int-res.com/abstracts/meps/v740/p123-144/ MEPS 1616-1599 0171-8630 Marine Ecology Progress Series 740 22 123 144 https://fra.repo.nii.ac.jp/record/2013226/files/Taga et al Figure.pdf application/pdf 1.8 MB 2025-02-12 https://fra.repo.nii.ac.jp/record/2013226/files/Taga et al Finescale spatial distribution of fish community.pdf application/pdf 741 KB 2025-02-12 https://fra.repo.nii.ac.jp/record/2013226/files/Taga et al supplementary_materials.pdf application/pdf 5.1 MB 2025-02-12 https://fra.repo.nii.ac.jp/record/2013226/files/Taga et al Table_Supplements.xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet 47 KB 2025-02-12