NDLI: ‘Invasional meltdown’: evidence for unexpected consequences and cumulative impacts of multispecies invasions

Content Provider	Springer Nature Link
Author	Montgomery, W. Ian Lundy, Mathieu G. Reid, Neil
Copyright Year	2011
Abstract	Empirical support for ‘invasional meltdown’, where the presence of one invading species facilitates another and compounds negative impacts on indigenous species, is equivocal with few convincing studies. In Ireland, the bank vole was introduced 80 years ago and now occupies a third of the island. The greater white-toothed shrew arrived more recently within the invasive range of the bank vole. We surveyed the abundance of both invasive species and two indigenous species, the wood mouse and pygmy shrew, throughout their respective ranges. The negative effects of invasive on indigenous species were strong and cumulative bringing about species replacement. The greater white-toothed shrew, the second invader, had a positive and synergistic effect on the abundance of the bank vole, the first invader, but a negative and compounding effect on the abundance of the wood mouse and occurrence of the pygmy shrew. The gradual replacement of the wood mouse by the bank vole decreased with distance from the point of the bank vole’s introduction whilst no pygmy shrews were captured where both invasive species were present. Such interactions may not be unique to invasions but characteristic of all multispecies communities. Small mammals are central in terrestrial food webs and compositional changes to this community in Ireland are likely to reverberate throughout the ecosystem. Vegetation composition and structure, invertebrate communities and the productivity of avian and mammalian predators are likely to be affected. Control of these invasive species may only be effected through landscape and habitat management.
Starting Page	1111
Ending Page	1125
Page Count	15
File Format	PDF
ISSN	13873547
Journal	Biological Invasions
Volume Number	14
Issue Number	6
e-ISSN	15731464
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-12-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Impacts Interspecific competition Island populations Invasional meltdown Multiple invasions Small mammal community Ecology Developmental Biology Plant Sciences Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Ecology, Evolution, Behavior and Systematics

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