Tree hollows in Tasmania A guide - CRC for Forestry

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FALSE HOLLOWSIdentifying hollowsWhat can, at first, appear to be a hollow may not actually be one.Common mistakes are thinking that small stains, burns, solid branchends or shallow cavities are actually hollows.10POOR VISIBILITYIt is obviously easier to detect hollows in dry open forest than densewet forest, but hollows will be missed in all forest types. More than halfof the hollows occurring in an area may be missed during ground-basedsurveys. They may be hidden by the surrounding vegetation, by otherparts of the same tree or they may be facing upwards and so cannot beseen from the ground. The more time spent looking, the more hollowsare likely to be found.Clockwise from top left:what appears to be ahollow is actually a shallowfire scar; a spout thatis shallow and does notactually contain a hollow;a burnt branch stub thatin poor lighting looks like ahollow; a striated pardalotenest where the hollow is notvisible because it is facingupwards; the entranceto a green rosella hollowpartially obscured by foliage.
EVIDENCE OF PREVIOUS USEOne of the best ways of telling if a hollow is a good one is if it haspreviously been or is currently being used by animals. Evidence ofcurrent or previous use includes, but is not limited to:• rubbing or chewing marks around the hollow entrance• splash marks or droppings at or near the hollow entrance• extensive scratch marks leading up to the hollow• visible nesting material inside the hollow• an animal observed inside or entering the hollow!From left toright: rubbingmarks aroundthe entrance toa hollow; a nestvisible inside ahollow; splashmarks around ahollow entrance.11
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 12 and 13: Searching for hollowsHollow surveys
Page 14 and 15: Selecting habitat treesDEAD WOODDea
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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