Impact of non-native reptiles on native ecosystems at the forefront of distribution

Research Project

Project/Area Number	17K07269
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Research Field	Conservation of biological resources
Research Institution	University of Tsukuba
Principal Investigator	Honda Masanao 筑波大学, 生命環境系, 教授 (60345767)
Co-Investigator(Kenkyū-buntansha)	太田英利兵庫県立大学, 自然・環境科学研究所, 教授 (10201972) 加藤英明静岡大学, 教育学部, 准教授 (10569643) 唐澤重考鳥取大学, 農学部, 教授 (30448592)
Project Period (FY)	2017-04-01 – 2023-03-31
Project Status	Completed (Fiscal Year 2022)
Budget Amount *help	¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000) Fiscal Year 2020: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000) Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000) Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000) Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords	保全 / 爬虫類 / キノボリトカゲ / 国内外来種 / 在来生態系 / 分布域 / 屋久島 / 琉球 / キノボリトカゲ科 / 琉球列島
Outline of Final Research Achievements	Comprehensive analyses were conducted on a non-native lizard, Japalura polygonata polygonata. As a result, we were able to collect individuals in areas where its distribution had not been previously recorded, and in January and February when temperatures were low. These indicate that this species is expanding its distribution and inhabiting under cooler-than-expected temperature. Stomach content analysis based on morphology identified 87 species. The most abundant was the Hymenoptera (mainly ants), indicating that ants are an important food source for the lizard in this region. Sequencing analysis detected features of the orders Coleoptera, Hymenoptera, Hemiptera, Polydesmida and Araneae.
Academic Significance and Societal Importance of the Research Achievements	本研究の成果に基づき、鹿児島県や屋久島町の関係者らとオキナワキノボリトカゲ外来集団の食物網を介した在来生態系への影響リスクや対策について協議を行い、国内外来種と言う新しい問題を共有することができた。また、屋久島では住民説明会等を開催し、オキナワキノボリトカゲの問題について啓発活動を行った。