"FRIENDS of Trigg Bushland president Peter Alcock says community vigilance is the most effective tool in protecting the 122ha Trigg Bushland Reserve.
As summer reaches its peak, Mr Alcock has urged locals to keep an eye out for suspicious behaviour near the Class-A reserve.
Several fires in past years and a growing network of "goat tracks" through the reserve were taking a toll on the bushland's biodiversity.
"Our bushland represents valuable remnants of natural habitat," he said.
"Having had a particularly dry spring, I'm reminded again of the fire risk.
"Arson is the main cause of fire in urban bushland and it is difficult to combat.
"However, vigilance by the local community is the best weapon."
Mr Alcock said that although the area was available for passive recreation, interference with the remnant bushland must be minimised.
"Unfortunately, added pressure from weed invasion and human activity is increasing levels of disturbance," he said.
"One aspect of this is the proliferation of small tracks and short cuts in areas popular for dog walking and exercising."
He said Friends of Trigg Bushland supported the City of Stirling's plans to fence some of the designated walking paths.
Stirling Mayor David Boothman said the reserve was "rich with native fauna and flora" and significant to the city and its heritage.
He said that with Perth experiencing a dry summer, it was important residents did all they could to preserve the Bushland Forever site.
"Do not leave your rubbish on site; discard it in the bins provided or take it home with you," he said.
"Please don't smoke in the bushlands. and report any suspicious behaviour immediately to the police."
Friends of Trigg Bushland is leading a guided tour through the reserve this Saturday at 8am.
Visit www.triggbushland.org.au for details."
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Website development funded by a Department of Conservation and Land Management Community Grant for Tuart Conservation and Management. Text and images copyright Friends of Trigg Bushland Inc except as otherwise noted. Website design by Nina McLaren and Peter Peacock 2008