Centre for Resources Development at the University of Guelph during the 1970s. Eagles (1980, 1984) updated and further developed much of this work and documented various identification criteria. These criteria deal principally with the identification of areas that represent unique, unusual or remnant ecosystems, unique landforms, habitat for rare and endangered species, areas of unusually high biological diversity, areas that perform a vital ecological function and areas with significant scientific or educational potential. Studies by Eagles have formed the basis for criteria used in ESA and SEF studies in various jurisdictions in Alberta including the City of
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