目撃効率からみたイノシシの生息状況と積雪, 植生, ニホンジカ, 狩猟, 農業被害との関係  [in Japanese] Present status of a wild boar (Sus scrofa) population estimated by sighting per unit effort (SPUE), and relationships to snowfall, vegetation, hunting effort, agricultural damages and the SPUE of Sika deer (Cervus nippon)  [in Japanese]

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Abstract

イノシシ(<i>Sus scrofa</i>)の保全と管理に向けて,銃猟時の目撃効率を補正した上で指標化し,生息状況を左右する要因や農業被害との関係を分析した.共分散構造分析によって双方向の因果関係や間接的な効果を考慮に入れたパス解析を行った結果,イノシシの目撃効率は,積雪の多い地域や広葉樹林の多い地域で高くなる傾向を示すパス係数が有意であり,ニホンジカ(<i>Cervus nippon</i>)の目撃効率が高い地域や入猟者の多い地域では低くなる傾向を示すパス係数が有意であった.また,雪の多い地域への入猟頻度は少なかった.これらの結果から,積雪と狩猟が相互に関連しあってイノシシの密度分布に影響を及ぼしていること,ニホンジカの食害による植生の衰退がイノシシの生息数を減らし目撃効率を下げるという間接的な競争関係がある可能性などが示唆された.また,イノシシの目撃効率はアンケート調査の農業被害程度と有意な相関があり,その関係はニホンジカとは異なる特徴があった.これらのイノシシの目撃効率に関する知見を活かして,管理目標の設定や地域的な状況の違いにあわせた対策の選択などの意志決定が可能なことを示した.<br>

To better manage wild boar (<i>Sus scrofa</i>) populations, we analyzed the relationships between sighting per unit effort (SPUE) of wild boar in gun hunting, and environmental factors affecting wild boars and agricultural damages. Path analysis suggested that snow fall and proportion of secondary deciduous forest had positive path coefficients on the SPUE of wild boar, and the SPUE of Sika deer (<i>Cervus nippon</i>) and gun hunting effort had negative path coefficients. Gun hunting effort was lower in areas of heavier snow. Interactions between snow fall and hunting affecting wild boar, and indirect competition between wild boar and Sika deer through vegetation damage by Sika deer, are both possible. SPUE of wild boar was significantly correlated to agricultural damage, and the relationship had different features from that of Sika deer. On the basis of these results, SPUE can be a target index for population management and helpful to select appropriate methods that depend on local conditions.<br>

Journal

  • Honyurui Kagaku (Mammalian Science)

    Honyurui Kagaku (Mammalian Science) 48(2), 245-253, 2008-12-30

    The Mammal Society of Japan

References:  22

Cited by:  3

Codes

  • NII Article ID (NAID)
    10026778890
  • NII NACSIS-CAT ID (NCID)
    AN00231656
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0385437X
  • NDL Article ID
    9763193
  • NDL Source Classification
    ZR4(科学技術--生物学--動物)
  • NDL Call No.
    Z18-1160
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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