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Providing evidence to improve practice

Action: Control birds Forest Conservation

Key messages

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  • One controlled study in Australia found that removing bell-miners from narrow-leaved peppermint forests did not improve the health of the trees in the forest.


Supporting evidence from individual studies


A controlled study in 1992–1995 in three sites in narrow-leaved peppermint Eucalyptus radiata forest in south eastern Victoria, Australia (Clarke & Schedvin 1999) found that the removal of bell miners Manorina melanophrys did not improve tree health. The change in tree health (an index based on crown size, crown density, the presence of dead branches and the shoot growth) did not differ between the plots where bell miners had been removed (-0.6), were present (-2.3) and a control plot where no bell miners occurred (-0.7). In June 1993, a total of 189 bell miners were removed from the experimental site and the surrounding area (2.7 ha), by mist netting and culling. The tree health index was based on the visual assessment of the health of 10 trees at each plot (50 x 50 m), following a standardized protocol.


Referenced papers

Please cite as:

Agra H., Schowanek S., Carmel Y., Smith R.K. & Ne’eman G. (2018) Forest Conservation. Pages 285-328 in: W.J. Sutherland, L.V. Dicks, N. Ockendon, S.O. Petrovan & R.K. Smith (eds) What Works in Conservation 2018. Open Book Publishers, Cambridge, UK.