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Using aerial photographs to remotely assess tree hollow availability


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Koch, AJ and Baker, SC 2011 , 'Using aerial photographs to remotely assess tree hollow availability' , Biodiversity and Conservation, vol. 20, no. 5 , pp. 1089-1101 , doi: 10.1007/s10531-011-0018-z.

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Tree hollows (cavities) are important habitat features and their conservation is challenging
for forest managers worldwide. Required by many faunal species for successful breeding
(Martin and Eadie 1999; Gibbons and Lindenmayer 2002), the availability of hollow bearing
trees can be an important predictor of the presence and abundance of hollow-using
wildlife (Lindenmayer et al. 1991a, b; Aitken and Martin 2008). Hollows occur more often
in older trees (Gibbons et al. 2000; Koch et al. 2008b; Temesgen et al. 2008) and hollow
availability is declining in many areas, primarily due to land clearance and timber harvesting
(Gibbons and Lindenmayer 2002). In some areas of the world, the majority of
hollows are formed by primary hollow excavators such as woodpeckers, which are
selective in their choice of tree (Martin et al. 2004; Ojeda et al. 2007). Hollows can also be
formed by stochastic processes such as wind, fire, termites and fungi, and these non-excavated
hollows provide important habitat in areas both with and without excavators
(Gibbons and Lindenmayer 2002; Wesolowski 2007). Difficulties in obtaining stand- and
landscape-level information on hollow density and distribution hinder effective management
of hollows and hollow-dependent fauna.

Item Type: Article
Authors/Creators:Koch, AJ and Baker, SC
Journal or Publication Title: Biodiversity and Conservation
ISSN: 0960-3115
DOI / ID Number: 10.1007/s10531-011-0018-z
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