Premier Anna Bligh this week warned more radical moves may be needed to stop the extinction of koalas in South East Queensland, including tougher dog laws, tighter planning controls, stronger protection of key habitat and more road crossings for wildlife.

Sustainability Minister Andrew McNamara cited research showing Pine Rivers' urban koala population density had fallen by 46 per cent over the past six years and numbers had dropped by 26 per cent on the Koala Coast (which includes the Redlands) since 1999.

A government spokeswoman said Redland City Mayor Melva Hobson, State Labor MPs Phil Weightman (Cleveland) and John English (Redlands), Wildlife Preservation Society spokesman Simon Baltais and Koala Action Group representative Ken Rawlins were some of the local people invited to join the new taskforce.

Ms Bligh said the taskforce - which included scientific experts, conservation groups, developers, government and council representatives and the RSPCA - would have to report back in a month.

They will be asked to consider:

* Protecting key koala habitat from further development;

* Road funding to provide more koala crossings and signage to warn drivers to slow down;

* Banning dogs in new developments that are seen as vital movement paths for koalas;

* Mandating that only koala-friendly fences, with gaps to allow ease of movement through yards, can be installed around new houses;

* Ban on clearing habitat trees in new development areas.

Cr Hobson said she would focus on the importance of education and habitat protection when she met with the taskforce.

The Koala Action Group welcomed the taskforce announcement, but the Wildlife Preservation Society said the government needed to stop listening to developers and start taking strong action against urban sprawl.

The State Opposition's sustainability spokesman Dave Gibson dismissed Ms Bligh's move against dog owners as a "stunt", saying it was more important to preserve koala habitat than cracking down on responsible pet owners.