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Section 779.20 (c) Continued. • material; and (iii) Indirect impacts res~ilti.ng _'ro^ changes in physical attributes of soil materials causing insufficient or poor revegetation. Changes in topography (e.g., disruption of gross landscape features, removal of natural shelters, or changes in micro-climate) will directly impact wildlife until these landscapes are regraded and successfully revegetated. Changes in specific topographical features (e. g. loss of steep ravines) may affect: mule deer and elk migratory pattercis; habitats necessary for elk calving or for survival of big game during winter periods; or hunting, nesting, feeding, and resting sites fur raptors. Steep ravines, and vege- tation, are examples of natural shelters that will be physically destroyed by co-.struction of ancill.sry facilities. Additional wildlife shelter may be rendered uninhabitable by noise, dust, and ground shock disturbances in the immediate ar=a (although as dis- cussed previously, some species appear to be able to adapt to some • of these disturbances (See Section 779.20). Changes in microclimate also result from surface mining activity requiring vegetation removal, topographic alteration, or destruc- tion of natural features. Such changes are important since most wildlife species interact with their environment in response to, and are dependent upon, the microcli~atic conditions present. Destruction or alteration of vegetational communities/habitat is the major direct and indirect impact to wildlife. Direct impacts can be stated as follows: (i) Destruction of food source upon which primary consumer wildlife groups depend; (ii) Destruction of cover upon which all wildlife species depend; (iii) Localized destruction of wildlife species having low or limited mobility; and (iv) Displacement of mobile wildlife species (including both predators and primary consumers). • 779-241