In a small step toward a more fire-resilient ecosystem, Audubon Canyon Ranch will burn nine and a half acres within the Martin Griffin Preserve as soon as weather conditions are safe. As early as Oct. 20, fire ecologists and their partners will ignite young, dense Douglas firs and overgrown brush along the Bourne Trail Fire Road, which sits between Bolinas and Stinson Beach, in an attempt to thin out the forest and expand coastal prairie…