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Title: Effects of forest cover on richness of threatened fish species in Japan
Authors: Lavergne, Edouard
Kume, Manabu
Ahn, Hyojin
Henmi, Yumi
Terashima, Yuki
Ye, Feng
Kameyama, Satoshi
Kai, Yoshiaki
Kadowaki, Kohmei
Kobayashi, Shiho
Yamashita, Yoh
Kasai, Akihide
Author's alias: 久米, 学
安, 孝珍
邉見, 由美
寺島, 佑樹
亀山, 哲
甲斐, 嘉晃
門脇, 浩明
小林, 志保
山下, 洋
笠井, 亮秀
Keywords: anthropogenic activity
coastal water bodies
environmental DNA metabarcoding
land use
actividad antropogénica
cuerpos de agua costeros
metasecuenciación de ADN ambiental
uso de suelo
Issue Date: Jun-2022
Publisher: The Society for Conservation Biology
Journal title: Conservation Biology
Volume: 36
Issue: 3
Thesis number: e13847
Abstract: Estuaries -- one of the most vulnerable ecosystems globally -- face anthropogenic threats, including biodiversity loss and the collapse of sustainable fisheries. Determining the factors contributing to the maintenance of estuarine biodiversity, especially that of fish, is vital for promoting estuarine conservation and sustainability. We used environmental DNA metabarcoding analysis to determine fish species composition in 22 estuaries around Japan and measured watershed-scale land-use factors (e.g., population size, urban area percentage, and forest area percentage). We sought to test the hypothesis that the richness of the most vulnerable estuarine fish species (i.e., registered by the Japanese Ministry of the Environment in the national species red-list) is determined by watershed-scale land-use factors. The richness of such species was greater where forest cover was highest; thus, forest cover contributes to their conservation. The proportion of agriculture cover was associated with low species richness of red-listed fishes (redundancy analysis, adjusted R² = 43.9% of total variance, df = 5, F = 5.3843, p = 0.0001). The number of red-listed species increased from 3 to 12 along a watershed land-use gradient ranging from a high proportion of agriculture cover to a large proportion of forest cover. Furthermore, the results showed that throughout Japan all the examined watersheds that were covered by >74.8% forest had more than the average (6.7 species per site) richness of red-listed fish species. This result can be attributed to the already high average forest cover in Japan of 67.2%. Our results demonstrate how the land use of watersheds can affect the coastal sea environment and its biodiversity and suggest that proper forest management in conjunction with land-use management may be of prime importance for threatened fish species and coastal ecosystems in general.
Description: 森林を守ることが海の生物多様性を守ることにつながる. 京都大学プレスリリース. 2021-10-26.
Rights: © 2021 The Authors. Conservation Biology published by Wiley Periodicals LLC on behalf of Society for Conservation Biology.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
DOI(Published Version): 10.1111/cobi.13849
PubMed ID: 34668598
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