A decade of change in the saproxylic beetle fauna of eucalypt logs in the Warra long-term log-decay experiment,Tasmania. 2. Log-size effects,succession, and the functional significance of rare species |
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Authors: | Simon J Grove Lynette Forster |
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Institution: | (1) Division of Forest Research and Development, Forestry Tasmania, GPO Box 207, Hobart, TAS, 7001, Australia;(2) Present address: School of Agricultural Sciences, University of Tasmania, Private Bag 54, Hobart, TAS, 7001, Australia |
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Abstract: | The first decade of sequential and cyclical sampling of the saproxylic beetles of twelve freshly felled Eucalyptus obliqua logs at Warra, Tasmania has allowed comparisons between larger-diameter mature and smaller-diameter regrowth log-classes
and between successive sampling cycles and years; and consideration of the interplay between these two aspects. The two log-classes
support different assemblages, with the mature log-class hosting consistently more species, more unique species, and proportionally
more obligately saproxylic species. Assemblages change seasonally and year-to-year, demonstrating succession. While changes
in the assemblages of mature and regrowth log-classes follow similar trajectories, they remain distinct at every point in
time. These differences remain apparent when considering sub-sets of the assemblages based on the rarity of the species involved,
their flightedness, saproxylicity and larval feeding guild. This study suggests a need to incorporate the conservation of
coarse woody debris derived from mature trees into production forestry practices. There is a particular need to devise silvicultural
and/or planning systems that cater for the retention and long-term recruitment of mature trees, since these are the only source
of the larger-diameter logs that were identified in this study as having particular ecological value. Through continuing the
Warra long-term log-decay experiment over the next century or more, a more complete picture of the saproxylic beetle fauna
will progressively emerge, together with a better understanding of the management requirements of the fauna. |
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