NDLI: Forest edge contrasts have a predictable effect on the spatial distribution of carabid beetles in urban forests

Content Provider	Springer Nature Link
Author	reika, rbertas Kotze, D. Johan
Copyright Year	2012
Abstract	Fragmented urban forest remnants are characterised by sharp edges and are bordered by various land-use types, which may have a considerable effect on the fauna and flora at forest edges, and into forest interiors. To investigate the effects of differentially contrasting edges (low vs. intermediate vs. high) on carabid beetle assemblages in urban boreal forests, we placed pitfall traps along a gradient from 6 m into three matrix types (secondary forest vs. grassland vs. asphalt) up to 60 m into urban forest patches in the cities of Vantaa and Helsinki, southern Finland. Individual species and carabid beetle assemblages were strongly affected by edge contrasts and distance from the forest edge. The strongest effect on individual species was caused by high contrasting edges: generalist and open-habitat species were favoured or not affected while forest specialists were affected negatively. Effects of the abundances of potential prey and competitors on the carabid beetles were also evaluated. Forest and moisture-associated carabid species were negatively to neutrally associated with springtail abundances while generalist and open habitat, and dryness associated species were more positively related to springtail abundances (a potential food source). In terms of potential competitors, forest and moisture-associated carabid species were negatively and/or neutrally affected by ant and wood ant numbers, while generalist and open-habitat species were neutrally to positively associated with these taxa. It appears that carabid beetle habitat associations are more important in the responses of these beetles across edges of different contrast than are the prey and competitor numbers collected there. We recommend the creation of “soft” or low-contrast urban edges if the aim of urban management is to protect forest carabids in cities.
Starting Page	867
Ending Page	881
Page Count	15
File Format	PDF
ISSN	1366638X
Journal	Journal of Insect Conservation
Volume Number	16
Issue Number	6
e-ISSN	15729753
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-04-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carabids Prey and competitors Resource-based edge effect model Urban forests Animal Ecology Biodiversity Entomology Life Sciences Conservation Biology/Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Animal Science and Zoology Nature and Landscape Conservation Insect Science

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