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Estimating edge effects on ground dwelling beetles at clearfelled non-riparian stand edges in Tasmanian wet eucalypt forest


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Baker, SC, Barmuta, LA, McQuillan, PB and Richardson, AMM 2007 , 'Estimating edge effects on ground dwelling beetles at clearfelled non-riparian stand edges in Tasmanian wet eucalypt forest' , Forest Ecology and Management, vol. 239, no. 1-3 , pp. 92-101 , doi: 10.1016/j.foreco.2006.11.012.

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Edge effects potentially have negative consequences for biodiversity in logging areas. In Tasmanian wet eucalypt forest, ground-dwelling beetle
assemblages responded to habitat edges between mature unlogged forest and young regeneration following clearfelling. Transects of pitfall traps
extended 100 m into unlogged forest and 10 m into the felled area firebreaks at four study sites (4 sites 3 transects 8 traps/transect = 96 traps).
The depth of edge influence extended between 10 m and 25 m into mature forest, and the beetle assemblage was estimated to be 95% similar to
interior forest at approximately 22 m from the edge. The species composition of beetles changed gradually with distance from the edge, but for
practical purposes we distinguished three zones of edge response: mature forest interior extending 22 m into unlogged forest, firebreak habitat at
the edge of the coupe that extends 1 m into unlogged forest, and an edge-affected mature forest zone in between. Individual species known to be
characteristic of mature and young forest were of greatest indicator value in mature forest interior and firebreak habitat, respectively. Choleva TFIC
sp 01 (Leiodidae), Decilaus nigronotatus, D. lateralis and D. striatus (all Curculionidae) were identified as indicator species characteristic of
mature forest interior. No species were found to be characteristic of the habitat edges.
These results are relevant to current management practices in Tasmanian wet eucalypt forest, in particular to the efficacy of linear reserve
networks. One hundred metre wide wildlife habitat strips, when bounded by recently harvested forest, are estimated to contain a little over 50% of
interior habitat not compromised by edge effects. Small patches of forest (<1 ha) retained in variable retention harvesting are predicted to contain
little or no uncompromised interior habitat for ground-dwelling beetles.

Item Type: Article
Authors/Creators:Baker, SC and Barmuta, LA and McQuillan, PB and Richardson, AMM
Keywords: Coleoptera; Depth of edge influence; Interior forest; Clearfelling; Indicator species; Forest age
Journal or Publication Title: Forest Ecology and Management
Publisher: Elsevier B.V.
ISSN: 0378-1127
DOI / ID Number: 10.1016/j.foreco.2006.11.012
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