In Conversation with Professor David Lindenmayer: Part 3

Professor David Lindenmayer of the Australian National University is one of our country's foremost ecologists. An outspoken conservationist, David uses his decades of experience and years of scientific studies to support his argument for a Great Forest National Park, in our state of Victoria, a move supported by Wild Melbourne, and a host of other NGO's.  

With the recent release of the video advertising his proposal for the GFNP, now seems like the right time to revisit a conversation I had with him late last year. 

In this third and final part of the interview, David describes the nature and plight of our State Emblem, the Leadbeater's Possum (Gymnobelideus leadbeateri).

The Leadbeater's Possum (Gymnobelideus leadbeateri): Curtesy of zoo.org.au 

The Leadbeater's Possum (Gymnobelideus leadbeateri): Curtesy of zoo.org.au 

The leadbeaters possum is a small marsupial weighing about 140 grams. Small enough to fit in your hand, they stand out with their long club like tail. However, it is not for this tail that their name is derived - rather, they are named for the taxidermist from the Victorian museum who described them: John Leadbeater.

What’s interesting, David says, is that they “move like Grease-Lightening… they’re much quicker than squirrels… and they live in colonies… ruled by a single dominant female.”

While small marsupials tend to be colonial (often for protection from predators and to keep warm), the Leadbeaters are unique in having a matriarchal society.

David notes that “The colony needs a number of nest trees to survive, not just one big old tree.” 

While the number of individuals in a colony can vary with season, David says he has noted a decline in the overall size of colonies, from 8 to 12 individuals down to an average of two. He says that logging old growth trees is an issue, as a tree often needs to be over 150 years old before it will form the hollows that these possums require for nests. Furthermore, as young forests are more fire prone, these animals are subjected to an increasing frequency of fires.

He notes that there is a cycle whereby fires tend to occur in areas previously logged, but that we are also more likely to log areas effected by fire (a process called salvage logging), and so forests are being driven to a younger and younger age.

“It becomes quite a vicious cycle… we log the forest and the habitat quality is immediately reduced for up to 150 years…  when the forest burns animals die on site, but then we’re also likely to salvage log it.”

Because of this, David and his collaborators have written a strategy for the conservation of the species and its habitat.    

“One of the things that have to happen is that every single remaining big old tree has to be conserved. Another thing… is that areas that are more likely to be old growth need to be left alone in the landscape and allowed to grow.”

“Animals basically go through local extinction… in places like Lake Mountain where they've been lost… we have to conserve every possible place where the animal is left over.”

Of course, tree hollows are imperative to a lot of Australian fauna, and so David’s plan may help to conserve numerous native species, but given the dire situation of these possums, the emphasis is on them.

“One of the key issues really is that the Leadbeaters possum is emblematic of a series of problems… it is a symptom of poor management of a system... If we can’t manage Leadbeaters possum… we simply aren’t able to manage these forests… when we talk about recovering the Leadbeaters possum we’re really talking about recovering the whole forest.”

Because of this, David has proposed the concept of a new nature reserve encompassing the entire range of the Possum.

“I think it is absolutely critical that we have a new giant forest national park - Absolutely critical. That is non-negotiable.”

He further declares a need to remove logging from the system, and to get the community involved.

“This is a major park for Victorians and Australians, and they need to fight for this, for the sensible use of its resources… People [also] need to start using their own purchasing power to make a difference… if they buy recycled paper, if they don’t buy pure-white Reflex paper that will mean there is no market for that paper, which is Leadbeaters possum habitat.”

David explains that people have the power to demand that the best be made of these parks – which are public land, and he concludes that supporting these ecosystems also means supporting the communities in and around them.

“The infrastructure needs to be put into towns like Marysville, like Warburton, like Healesville…where we can see the tangible benefits.”

In a final summary of his work and his passion, Professor Lindenmayer leaves me with these words:

“I have a strong belief in the science… I am a Victorian; I was born in Victoria… I am passionate about the state and I want to see the state manage its resources in the best way possible.”

- Professor David Lindenmayer.