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Title: Distribution of Japanese Eel Anguilla japonica Revealed by Environmental DNA
Authors: Kasai, Akihide
Yamazaki, Aya
Ahn, Hyojin
Yamanaka, Hiroki
Kameyama, Satoshi
Masuda, Reiji  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-2184-1533 (unconfirmed)
Azuma, Nobuyuki
Kimura, Shingo
Karaki, Tatsuro
Kurokawa, Yuko
Yamashita, Yoh
Author's alias: 笠井, 亮秀
山崎, 彩
安, 孝珍
山中, 裕樹
亀山, 哲
益田, 玲爾
東, 信行
木村, 伸吾
唐木, 達郎
黒川, 優子
山下, 洋
Issue Date: 25-Feb-2021
Publisher: Frontiers Media SA
Journal title: Frontiers in Ecology and Evolution
Volume: 9
Thesis number: 621461
Abstract: The abundance of Japanese eel Anguilla japonica has rapidly decreased in recent decades. Following a re-evaluation of the possibility of extinction, the Japanese Ministry of the Environment and the International Union for Conservation of Nature listed the Japanese eel as an endangered species in 2013 and 2014, respectively. However, their abundance and precise distribution have never been clarified owing to their nocturnality and difficulty in their capture. In this study, the distribution of Japanese eels was investigated by monitoring for environmental DNA (eDNA), a non-invasive and efficient detection method. A total of 365 water samples were collected from 265 rivers located throughout Japan. High concentrations of eDNA of Japanese eels were detected in rivers on the Pacific side, but were low in the Sea of Japan side. In particular, very little eDNA amplification was confirmed from Hokkaido and the north of the Sea of Japan. The eDNA distribution in Japanese rivers coincides with the transport of the larvae in the ocean, as estimated by numerical simulations. Generalized linear mixed models were developed to explain the distribution of eDNA concentrations. The total nitrogen concentration emerged as an important factor in the best model. These results indicate that the distribution of Japanese eel is mostly determined by the maritime larval transport, and their survival and growth depend on the abundance of food in the river. The findings of the present study are useful for the management of populations and in the conservation of Japanese eels.
Description: 絶滅危惧種ニホンウナギの分布域を環境DNA解析で推定. 京都大学プレスリリース. 2021-03-03.
Rights: © 2021 Kasai, Yamazaki, Ahn, Yamanaka, Kameyama, Masuda, Azuma, Kimura, Karaki, Kurokawa and Yamashita. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
URI: http://hdl.handle.net/2433/261850
DOI(Published Version): 10.3389/fevo.2021.621461
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2021-03-03-0
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