Establishment of objective wildlife damage area estimation technology, and verification of error conditions between the estimated objective indicators and the subjective damage perceptions

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14942
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 41030:Rural environmental engineering and planning-related
• Research Institution: National Agriculture and Food Research Organization
• Principal Investigator: Nakamura Daisuke 国立研究開発法人農業・食品産業技術総合研究機構, 畜産研究部門, 主任研究員 (30728556)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 無人航空機 / 被害量推定 / イノシシ / トウモロコシ / 費用対効果

Outline of Final Research Achievements

We verified the applicability in Japan of a method for estimating the area of field damage caused by wild boars based on aerial photography by unmanned aerial vehicles, which has been implemented in Europe. Comparison of aerial photography and stock counts demonstrated that the method can be applied to corn fields in Japan. We also analyzed the amount of damage caused by wild boars and the cost-effectiveness of temporary electric fences. In paddy farmlands, it was found that even in farmlands where damage by wild boars is assumed to be serious, the cost-effectiveness of the fences is not positive unless the measures are implemented in an area of approximately 10 a or more.

Free Research Field

農村計画学、農業経営学、生態学

Academic Significance and Societal Importance of the Research Achievements

これまで被害算定基準が曖昧なまま多額の公的支援が実施されてきたわが国の鳥獣害対策分野において、欧米で先行的に実施されているドローンを用いた客観的な指標を用いて被害量を推定することが可能であることが想定された。計画段階では雑草による影響が危惧されたが、トウモロコシ畑をNDVIで分類するうえでは大きな問題はなかった。また、公的支援の経営面での正当性を立証するためにおこなった費用対効果分析では、補助が無い場合は10a以上の規模の水田農地でないとイノシシ被害に対して効果が優位とならないことが判明した。