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Effects of forest cover on richness of threatened fish species in Japan

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Title: Effects of forest cover on richness of threatened fish species in Japan
Authors: Lavergne, Edouard Browse this author
Kume, Manabu Browse this author
Ahn, Hyojin Browse this author
Henmi, Yumi Browse this author
Terashima, Yuki Browse this author
Ye, Feng Browse this author
Kameyama, Satoshi Browse this author →KAKEN DB
Kai, Yoshiaki Browse this author →KAKEN DB
Kadowaki, Kohmei Browse this author →KAKEN DB
Kobayashi, Shiho Browse this author →KAKEN DB
Yamashita, Yoh Browse this author →KAKEN DB
Kasai, Akihide Browse this author →KAKEN DB
Keywords: anthropogenic activity
coastal water bodies
environmental DNA metabarcoding
land use
actividad antropogenica
cuerpos de agua costeros
metasecuenciacion de ADN ambiental
uso de suelo
Issue Date: 2-Mar-2022
Publisher: John Wiley & Sons
Journal Title: Conservation Biology
Volume: 36
Issue: 3
Start Page: e13847
Publisher DOI: 10.1111/cobi.13849
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 R-2 = 43.9% of total variance, df = 5, F = 5.3843, p = 0.0001). The number of red-listed species increased from 3 to 11 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.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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