Invasive alien species disrupt spatial and temporal ecology and threaten extinction in an insular, small mammal community

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• 作者：W. Ian Montgomery (1) (2)
  Sally S. J. Montgomery (1)
  Neil Reid (2)
  
  1. School of Biological Sciences ; Queen鈥檚 University Belfast ; MBC ; 97 Lisburn Road ; Belfast ; BT9 7BL ; Northern Ireland ; UK
  2. Quercus ; School of Biological Sciences ; Queen鈥檚 University Belfast ; MBC ; 97 Lisburn Road ; Belfast ; BT9 7BL ; Northern Ireland ; UK
  
• 关键词：Invasive alien species ; Island ; Small mammals ; Species replacement
• 刊名：Biological Invasions
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：17
• 期：1
• 页码：179-189
• 全文大小：541 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Sciences
  Ecology
  Hydrobiology
  Zoology
  Forestry
  
• 出版者：Springer Netherlands
• ISSN：1573-1464

文摘

The impact of invasive bank vole (Myodes glareolus) and greater white-toothed shrew (Crocidura russula) on indigenous Irish small mammals, varies with season and habitat. We caught bank voles in deciduous woodland, young coniferous plantations and open habitats such as rank grass. The greater white-toothed shrew was absent from deciduous woods and plantations but did use open habitats with low level cover in addition to field margins. Numbers of both invasive species in field margins during summer were higher than in the previous spring. The indigenous wood mouse (Apodemus sylvaticus) and pygmy shrew (Sorex minutus), differed in degrees of negative response to invasive species. Wood mice with bank voles in hedgerows had reduced recruitment and lower peak abundance. This effect was less extreme where both invasive species were present. Wood mice numbers along field margins and open habitats were significantly depressed by the presence of the bank vole with no such effect in deciduous woodland or coniferous plantations. Summer recruitment in pygmy shrews was reduced in hedgerows with bank voles. Where greater white-toothed shrew was present, the pygmy shrew was entirely absent from field margins. Species replacement due to invasive small mammals is occurring in their major habitat i.e. field margins and open habitats where there is good ground cover. Pygmy shrew will probably disappear from these habitats throughout Ireland. Wood mice and possibly pygmy shrew may survive in deciduous woodland and conifer plantations. Mitigation of impacts of invasive species should include expansion of woodland in which native species can survive.