Relationships between crop damage by wild boar and surrounding environmental characteristics in paddy fields and non-paddy fields in Motegi, Japan

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  • 栃木県茂木町の水田と畑地におけるイノシシ被害地点と周辺環境特性
  • トチギケン モテギマチ ノ スイデン ト ハタチ ニ オケル イノシシ ヒガイ チテン ト シュウヘン カンキョウ トクセイ

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Abstract

The objective of this study was to assess relationships between crop damage by wild boars (Sus scrofa) and surrounding environmental characteristics. A geographic information system (GIS) dataset consisting of 491 incident points where the crop damage occurred was used in this study. Multiple logistic regression analysis was used to determine which environmental factors influenced the incident points. First the GIS dataset was divided into paddy field and non-paddy filed sub-datasets. The analyses proceeded with these sub-datasets and several randomly-generated 491-point datasets used as the explained variables, and 14 environmental factors (e.g., the distance between the incident point and the nearest forest edge, the area of nearest forest) used as explanatory variables. The explanatory variables selected for the model of crop damage by wild boar differed for the paddy field and non-paddy field sub-datasets. For paddy fields, the distance from the nearest forest edge and that from first-grade rivers significantly explained crop damage by the wild boar. In contrast, for non-paddy fields, the distance from abandoned cultivated land, from the nearest buildings, and the area of the nearest forest significantly affected crop damage. These results suggest that cultivated land, the surrounding environment, and their interrelationships should be considered when developing countermeasures against crop damage by wild boars.<br>

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