The geology, landform, climate and plant and animal communities of the area, plus location, have determined use by humans. Main forms of past disturbance include clearing (especially in southern portions of Ingalba and Big Bush Nature Reserves), sheep grazing, and logging for fences and firewood. Mugga ironbark, grey box and white cypress pine have been extensively logged at Ingalba Nature Reserve. Regeneration since reservation has resulted in a progressive increase in vegetation density with significant tree and shrub regrowth.
