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The UA’s Santa Rita Experimental Range is one of the large-scale/long-term study areas that are crucial for this research. Using techniques like repeat photography, inclusion or exclusion of livestock and vegetation surveys since the 1950s, scientists stu (Photo: Mitchel McClaran) The UA’s Santa Rita Experimental Range is one of the large-scale/long-term study areas that are crucial for this research. Using techniques like repeat photography, inclusion or exclusion of livestock and vegetation surveys since the 1950s, scientists study how ecosystems react to different influences such as climate change and grazing.