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• W6305638 abstract "Old, larger-diameter eucalypt trees are a common structural feature of mature,unharvested wet forests in temperate Australia. In Tasmanian production forest, suchtrees will become rarer since there is insufficient time under the current prescribedrotation length of 80-100 years for replacements to regrow following clearfelling.Drawing on insights from overseas studies, one question that arises is what effect thisanticipated change in age structure may have on tree-dependent biodiversity. InTasmania, the relationships between tree age and saproxylic organisms (dead wooddependent) are insufficiently understood to allow explicit consideration of either theirrole as 'ecosystem engineers' (e.g. in hollow formation) or their conservationrequirements in production forest landscapes. This thesis seeks to redress thisdeficiency. It documents two main studies that together represent the first attempt toquantify the saproxylic beetle fauna of living Eucalyptus obliqua trees - the dominantwet eucalypt species in Tasmania.The first study investigated the saproxylic beetle fauna of young (69 years old),medium-aged (105 years old) and old (>150 years old) E. obliqua trees. Beetleassociations with different aged trees and different wood fractions (stem, branchesand bark) were explored by emergence trapping of wood fractions from six trees ineach of the three age classes. The habitat within the stems of trees from each of thethree age-classes was investigated by destructive sampling of wood billets. Woodwithin the stem was classified into eleven rotten wood types.Trees in the oldest age-class were found to support a richer and more distinctivesaproxylic beetle fauna compared to those in the two younger age-classes. They hadhigher overall species richness per tree and per surface area sampled; higher richnessof obligate saproxylic beetle species; and a different assemblage composition ofobligate saproxylic beetle species compared to trees in the younger age-classes. Bycomparison, trees in the two younger age-classes shared similar species richness andcomposition.Stem-dwellers accounted for much of the distinctiveness of the saproxylic beetlefauna of trees in the oldest age-class. This may have been due to the more complexarray of habitats present in the stems of these old trees compared to stems of trees inthe two younger age-classes. Trees in the oldest age-class harboured more rotten wood types and a larger proportion of decayed stem compared to the two youngerage-classes. A strong correlation was found between the assemblage composition ofobligately saproxylic beetles and the assemblage composition of rotten wood typespresent within a tree. Specific associations with particular rotten wood types werefound for several beetle species.Eucalyptus obliqua wet forests are naturally fire-prone and likely to harbour beetlespecies which are adapted to this disturbance, and which may count as 'ecosystemengineers' if they then facilitate the creation of more complex habitat features (such astree hollows) that are utilised by various species including arboreal mammals andbirds. Thus the second study was a manipulative experiment examining the role ofsaproxylic beetles in habitat formation in trees, and their association with fire-woundsand mechanical wounds.Beetle associations were assessed by capturing (a) beetles attracted to newly createdmechanical wounds and fire-wounds (sticky trapping), and (b) beetles that colonisedthese same wounds (emergence trapping a year later), on 45 trees (fifteen trees fromeach treatment: wound, burn, and control).Preferences for burnt over unburnt recently exposed sapwood were identified in sevensaproxylic beetle species. Several further species with the potential to act as'ecosystem engineers' in ageing E. obliqua trees were identified through comparingfindings from the two studies.On the basis of the findings from these studies, management recommendations aremade that, if implemented, would demonstrate a more pre-emptive approach tosaproxylic biodiversity conservation in production forests. In general, efforts shouldbe made to ensure that long-term structural complexity is enhanced beyond levelswhich will eventuate under the current silvicultural practices. This could be achievedby introducing variability in harvesting intensity and mature tree retention levels, inrotation length and in coupe size. Additionally, where the forest landscape is currentlydominated by younger managed stands, 'ecological thinning' could be considered as ameans of accelerating the development of structurally more complex forest. At thelandscape level, management planning should consider maintaining sufficient spatialconnectivity and temporal continuity of a range of tree age-classes to ensure themaintenance of the dependent fauna." @default.
• W6305638 created "2016-06-24" @default.
• W6305638 creator A5029927985 @default.
• W6305638 date "2008-01-01" @default.
• W6305638 modified "2023-09-26" @default.
• W6305638 title "Saproxylic beetles associated with habitat features in Eucalyptus obliqua trees in the wet eucalypt forests of southern Tasmania" @default.
• W6305638 hasPublicationYear "2008" @default.
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