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Problems caused by the Bell Miner and the Noisy Miner | FF0008 |
Ian Temby, Flora and Fauna Branch
June, 2003 |  |
Problem
Exclusion of other species of insectivorous birds from colony areas, with resultant die-off of trees due to infestations of sap-sucking psyllid insects farmed by the Bell Miners.
The Noisy Miner is also responsible for exclusion of other birds from colony areas, with resultant die-off of trees.
Background
Bell Miners and Noisy Miners are territorial, aggressive birds. A large colony may control an area of many hectares, and exclude most other species of birds, particularly small, insectivorous species.
Unlike many other birds, Bell Miners and Noisy Miners do not eat the sap-sucking insects, but only eat the sugary coverings or lerps which these insects exude to protect themselves. With predation by birds reduced or absent, psyllid populations can flourish. Trees supporting large numbers of psyllids may become severely debilitated or die.
The impact of die-off due to Bell Miners or Noisy Miners can be significant in remnant stands of trees. The same effects are not likely to have been significant prior to the clearing of large areas of bush. Bell Miners and Noisy Miners may be only one of many factors including changing hydrology, soil compaction, altered soil nutrient status and the effects of reduced natural diversity on host-parasite systems, which may contribute to the die-off of the trees.
Many people enjoy the calls and presence of these species and appreciate their presence.
Solution
- Accept declining health of a stand of trees given that it is likely that the miners will move elsewhere before all the trees die and given that the removal of the miners may not solve the problem.
- Plan for the future by planting local native species to replace those that are declining. Authorisation may be given to control these species as part of a habitat management plan involving planting with local native species.
- Contact the DSE Customer Service Centre on 136 186 to determine whether any other action can be taken.
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