Does hollow occurrence vary with forest type? A case study in wet and dry Eucalyptus obliqua forest

Koch, Amelia J.; Munks, Sarah; Driscoll, Don A.; Kirkpatrick, J. B.

doi:10.1016/j.foreco.2008.03.025

Cited by 75 publications

(57 citation statements)

References 38 publications

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“…Irregular crowns are characteristic of senescent trees and indices of crown irregularity from both SFRI and PI have been found to be associated with hollow abundance in wet eucalypt forests [49][50][51]. Hollows provide crucial nesting habitat for hollow-dependent species [52,53]. Coarse woody debris, derived once these trees die and fall over, is likely to be of higher value for saproxylic invertebrates and fungi than logs derived from younger trees [54,55].…”

Section: Structurally Mature Forestmentioning

confidence: 99%

Landscape Structure and Mature Forest Biodiversity in Wet Eucalypt Forests: A Spatial Analysis of Timber Production Areas in South-Eastern Australia

Wood

Wardlaw

Pryde³

et al. 2017

Forests

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Abstract:Fire and timber harvesting can diminish the extent of older forests in the near term. The amount and configuration of mature and regenerating forest in the landscape (landscape structure) influences habitat suitability for mature-forest-associated species. We applied spatial analysis to describe the landscape structure of three wet eucalypt forest landscapes in south-eastern Australia and used the results from empirical biodiversity studies to frame interpretation of possible impacts on habitat suitability. We determined the extent of structurally mature forest, its reservation status, and the extent to which it may be edge affected. We also assessed how landscape structure potentially impacts the re-establishment of mature-forest-associated species into previously harvested areas through the proximity to (mature forest influence)-and extent of (landscape context)-mature forest in the surrounding landscape. Our analyses were designed to inform forest management initiatives that draw on these landscape-scale concepts. Central Highlands Victoria had less structurally mature eucalypt forest (4%) compared to North West Tasmania (14%) and Southern Forests Tasmania (21%). Detrimental effects of edge influence on structurally mature forest appeared relatively minor. Low levels of mature forest influence combined with low-medium surrounding mature forest cover (landscape context) indicate potential limitations on recolonisation of coupes by mature-forest-associated species. Our results vindicate the recent shift toward variable retention silviculture and landscape context planning. Our approach to landscape analysis provides a useful framework for other managed forest landscapes.

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Section: Structurally Mature Forestmentioning

confidence: 99%

Landscape Structure and Mature Forest Biodiversity in Wet Eucalypt Forests: A Spatial Analysis of Timber Production Areas in South-Eastern Australia

Wood

Wardlaw

Pryde³

et al. 2017

Forests

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“…Required by many faunal species for successful breeding (Martin and Eadie 1999;Gibbons and Lindenmayer 2002), the availability of hollowbearing 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).…”

Section: Introductionmentioning

confidence: 99%

“…A major constraint to landscape-scale model development is that tree-level variables are more strongly related to hollow availability than the site-level variables on which the models are based (Gibbons et al 2000;Fan et al 2003b;Koch et al 2008b). One tree-level variable frequently related to hollow occurrence in a large range of forest types is tree senescence, as assessed by either tree shape or amount of dead branches (Gibbons et al 2000;Fan et al 2003b;Koch et al 2008b).…”

Section: Introductionmentioning

confidence: 99%

“…One tree-level variable frequently related to hollow occurrence in a large range of forest types is tree senescence, as assessed by either tree shape or amount of dead branches (Gibbons et al 2000;Fan et al 2003b;Koch et al 2008b). Dead wood can potentially be differentiated from live wood in aerial photographs.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of the current study was to determine whether assessing the cover of mature and senescing trees from aerial photographs reflects the relative availability of hollow-bearing trees in Tasmania's dry and wet eucalypt forests. Not all mature trees contain hollows (Koch et al 2008b) so we wanted to determine whether the remote assessment of maturity and senescence more closely reflect hollow-bearing tree availability rather than just mature tree availability.…”

Section: Introductionmentioning

confidence: 99%

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Using aerial photographs to remotely assess tree hollow availability

Koch

Baker

2011

Biodivers Conserv

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Tree hollows provide critical habitat for many species worldwide. The conservation of hollow-bearing trees presents a particular challenge for forest managers, partly due to difficulties in predicting their occurrence across a landscape. We trialled a novel approach for assessing relative hollow availability, by remotely estimating mature crown cover and senescence from aerial photographs in Tasmania, Australia. These estimates were tested against plot-based field assessments of actual occurrence of hollow-bearing trees. In dry forest we conducted ground-based surveys of hollows for all mature trees ([50 cm dbh) in 37 half-hectare plots. In wet forest, we conducted helicopter-based surveys of hollows for all mature trees in 45 oldgrowth plots (0.29-4.63 ha). Aerial photographs (1:10,000-1:25,000) were used to classify the senescence and cover of mature crowns in each plot. Regression analysis showed that, in dry forest, hollow-bearing tree densities were strongly related to the remote assessment of mature crown cover, with an 8% increase in variability explained if senescence was also included (R 2 = 0.50). In wet forest, mature crown cover alone was the best model (R 2 = 0.53 when outliers were removed). Assessing senescence was less important in dense wet forests than dry forest because trees take longer to form mature-shaped crowns and so mature-shaped crowns are more likely to have hollows. These results suggest that, with skilled photo-interpretation, aerial photographs can be useful for remotely assessing the relative density of hollowbearing trees. This approach has the potential to greatly improve conservation planning for hollows and hollow-dependent fauna.

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Eucalyptus obliqua

Weisgerber¹,

Weisgerber²

2019

Enzyklopädie Der Holzgewächse: Handbuch Und Atlas Der Dendrologie

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Does hollow occurrence vary with forest type? A case study in wet and dry Eucalyptus obliqua forest

Cited by 75 publications

References 38 publications

Landscape Structure and Mature Forest Biodiversity in Wet Eucalypt Forests: A Spatial Analysis of Timber Production Areas in South-Eastern Australia

Landscape Structure and Mature Forest Biodiversity in Wet Eucalypt Forests: A Spatial Analysis of Timber Production Areas in South-Eastern Australia

Using aerial photographs to remotely assess tree hollow availability

Eucalyptus obliqua

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