Following up on the National Koala Conference, with thanks to Cheryl for providing the link, a detailed blog post has been written titled ‘Koalas are being driven towards extinction’.
While convincing me that the Federal government’s listing should have applied to all koalas. I am also supportive of the suggestion that ” . . . for koalas to survive, protection of their habitat has to be the top priority.”
The only problem being, understanding what is happening to koala habitat is not straight forward, even when it’s supposedly protected.
For example, at Gunnedah, where 25% of koalas died during a heatwave in 2009, researchers have been providing water to koalas, from ‘blinky drinkers’, designed by a local farmer.
They have found koalas are regularly drinking water during winter, when the research began. This departure from the general perception, that koalas get all their water from leaves, could reflect a reduction in soil fertility, including Soil Water Holding capacity.
Another threat to this population is the proposed Shenhua Watermark Coal mine. The NSW government has recently bought back the rights to 51% of the coal exploration area. Unfortunately, this area is largely cropping land and the areas occupied by koalas remain under threat.
Also speaking at the conference was James Fitzgerald, about the growing koala population on the southern tablelands and their bark chewing. According to James koalas are drawn to particular trees that have a higher sodium content in the bark. Hence, they are raking around the base of these trees to protect them from fuel reduction burns.
Another approach, given trees can only lose so much bark before they die, would be to provide ‘salt licks’ for koalas. These are readily available at any stock feed outlet and could help both koalas and trees.
There isn’t reference to the talk about south coast koalas in the article. Although with regard to fuel reduction burning, the timber in the photo below is from dead Silver-top ash, the main eucalyptus regrowth after integrated logging. All of this biomass, taken from a 10 x 10 metre plot, would be consumed in a fuel reduction burn.
The next shot is shows the timber from particular live and dead Allocasuarina littoralis trees, in the same plot. Most of these trees would die in a fuel reduction burn, largely cancelling any benefit from the burning.
The benefits from removing some of the trees include, actually lowering the potential impact of wildfire on live eucalyptus, maintaining soil cover and habitat for ground dwelling species, along with providing woody biomass for other more useful and less polluting purposes.
All up, just over 1 cubic metre of of woody biomass, equating to something above 100 tonnes per hectare, has been removed from the plot. If this growth had all gone into eucalyptus trees, the Forestry Corporation could rightly claim its management works. Shame about that.