No.177 研究課題 / Project
玉川上水におけるカメ類の分布と個体群構造調査Distribution and population structure of freshwater turtles in the Tamagawa-Jyosui waterworks| 一般研究 General Research |
No.177 |
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| 代表研究者 Principal Investigator |
佐藤 方博 Masahiro Sato |
| 所属（採択当時） Affiliation |
NPO法人生態工房 理事 Director of Nonprofit Organization Seitai Koubou |
| 研究内容要約 Research Summary |
玉川上水では、２００３年以降、特定外来種であるカミツキガメの幼体が確認されており、繁殖・定着している可能性が高い。この他にも、ペット由来の外来カメ類が生息し、在来カメ類への影響が懸念されるが、当地においてカメ類を対象とした調査が行われておらず、生息状況が明らかにされていない。本研究は、当地に生息するカメ類の生息状況を把握し、在来カメ類の保全と外来カメ類の駆除に寄与することを目的に実施された。調査は、玉川上水の開渠部全区間（総長約３０km）を５区間に分け、誘引エサによるワナ掛け、手取り、および直接観察によってカメ類の確認を行い、外来種の割合を算出し個体数の推定を行った。 Young snapping turtles (Chelydra serpentina), which are a specified non-native species, have been found in the Tamagawa Canal since 2003, and there is a strong possibility that they are breeding and becoming firmly established. Other non-native turtles that were originally kept as pets also inhabit the canal, and it is feared that they will have an impact on indigenous types of turtle, but no survey of turtles has been conducted in this area and the habitat situation is not clear. This study was conducted with the aim of understanding the habitat situation of turtles living in this area, with a view to contributing to the protection of indigenous turtles and the extirpation of non-native turtle varieties. In this study, the whole of the open channel section of the Tamagawa Canal (about 30km in total) was divided up into five zones, and the types of turtle in the canal were verified using snares baited with food, with some turtles being taken away for study and others being observed directly in situ. The proportion of non-native varieties was calculated and the size of the populations was estimated. |
| 共同研究者 Collaborators |
片岡友美、林 真帆、増永望美 （特定非営利活動法人生態工房） Tomomi Kataoka , Maho Hayashi, Nozomi Masunaga (NPO Eco-Works) |
| 研究全文 Full Text |
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