The Influence of Forest Boundary Shape and Environmental Variables on Farmland Invasion by Wild Japanese Macaques(<Special Issue>Multipurpose Forest Management)

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概要

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• Crop damage caused by wildlife, including macaques, has become an increasingly serious problem in Japan. We focused on two Japanese macaque troops with adjacent home ranges. We calculated landscape indices of their habitats and measured differences in frequency of farmland invasion between the troops. Our objective was to determine the relationship between troop invasion frequency and landscape indices (size, shape, and configuration). Location data of the "Yonekura" and "Otsuki" troops were collected by radio telemetry from 2004 to 2006. The home range areas of the two troops were estimated using the Minimum Convex Polygon method. A land-cover map was acquired from remotely sensed imagery (ALOS/AVNIR-2). This map was classified into five landscape classes (forest, farmland, urban, grassland, and water). Troop home range areas were overlain on the land-cover map, and landscape patches included in home ranges were counted. To discern differences between troop habitats, the landscape index of each patch was calculated. Size, shape, and configuration of habitat were selected according to a previous study. A generalized linear mixed model was applied to identify environmental factors contributing to farmland invasion by the troops. We calculated the importance of the variables that contributed most to farmland invasion. The home range area of the Otsuki troop was larger than that of the Yonekura troop, and within the ranges, the ratio of farmland to home range and the ratio of urban land to home range were higher for the Otsuki troop. For each landscape index, a difference was found between the habitats of the two troops. In models of the two troops, distance between farmland and forest boundary and distance from a road were important factors. Moreover, the frequency of farmland invasion differed in distances from exclosure fences. Differences in farmland invasion between troops were attributable to differences in habitat landscape indices. The shape of the Otsuki troop habitat was relatively complex, increasing opportunities for macaques to come in contact with farmland. Our results show that it will become increasingly easy for Otsuki troop to invade farmland.

• 森林計画学会の論文

著者

• MURAKAMI Takuhiko

  Faculty of Agriculture, Niigata University

• Murakami Takuhiko

  Faculty Of Agriculture Niigata University

• Murakami Takuhiko

  Faculty Of Agriculture Kyushu University

• Mochizuki Shota

  Graduate School of Science and Technology, Niigata University

• Mochizuki Shota

  Graduate School Of Science And Technology Niigata University

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