Tree hollows in Tasmania A guide - CRC for Forestry

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Selecting habitat treesDEAD WOODDead wood in thecanopy of a tree generallymeans that the tree hasexperienced some stress.Stressed trees do not healas readily as healthy treesand therefore hollowformation is more likely.A large, healthy tree with fewdead branches (right) and alarge tree with lots of large deadbranches which is, therefore, morelikely to contain hollows (below).Dead branches can also bedropped by the tree and ahollow may form where thebranch broke off. This meansthat the more dead branchesand the bigger the deadbranches you see in the canopyof a tree, the more likely thetree is to have a hollow.14Opposite page from top left to bottomright: trees with increasing levels ofsenescence. The crown starts out small,then grows, thins, the number and sizeof dead branches increases, the tree dies,loses its limbs and will eventually fall over.
TREE FORMAs trees age, their growth and senescence typically follows a sequencethat affects their form and potential for developing hollows. Trees withvery healthy crowns are less likely to have hollows than trees furtheralong this sequence. Dead trees may have a lot of hollows, but thesecan be lost as branches are dropped. While trees of any form maycontain hollows, the best shape for a habitat tree is one which is a livetree with dead wood and a crown of reasonable size.1 2345 678915
Page 3 and 4: ContentsWhat is a hollow and why is
Page 5 and 6: Hollow related legislationThe 1997
Page 8 and 9: What makes a good hollow?(continued
Page 10 and 11: FALSE HOLLOWSIdentifying hollowsWha
Page 12 and 13: Searching for hollowsHollow surveys
Page 16 and 17: Selecting habitat trees (continued)
Page 18 and 19: Habitat treesOptimal habitat trees
Page 20 and 21: Habitat trees (continued)In some ar
Page 22 and 23: How many hollows are enough?The que
Page 24 and 25: Practical ideas for land managersTh
Page 26 and 27: Additional readingCawthen, L 2007,

Tree hollows in Tasmania A guide - CRC for Forestry

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