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of time and of lesser magnitude than the changes in snow'conditions required to produce them. However, some parts of the mountain ecosystem are much more susceptible to changes in snow conditions than others, so important local effects are possible. In general, these susceptible components are very small parts of the entire system but their economic or esthetic value may be much greater than their mass or area suggest. Remedial action is possible in most of these cases but has not been studied in this project. Our work has shown three ecosystem components to be most susceptible to increased snowfall: 1) snowbank situations at elevations above treeline; (2) elk herds (in other mountain ranges other big game species may be similarly affected). and 3) some small mammal populations, especially the deer mouse. Not all of these impacts are necessarily deleterious; an increase in the area of snowbank edge habitats in alpine area may. for example, increase the niches available for rare plant species. Finally, even in the small ar~as where we predict greatest impacts from increased snowfall, the changes involved are unlikely to approach the magnitude of other man-made impacts on mountain ecosystems. How- ever. it should be remembered that they may act in phase with other man-made impacts and with natural climatic changes, in which case the total effect could be much greater than our studies suggest. LITERATURE CITED Freeman, R. A. 1975. Ecological in an alpine lake ecosystem. Dept. Fisheries and Wildlife State UniverSity, p. 79. kinetics of silver Ph.D. thesis. Biology, Colorado Kahan, A. M. 1972. Status of cloud seeding -- 1972. In: Watersheds in Transition (ed., S. C. Csallany, T. G. McLaughlin and W. D. Striffler). Amer. Water Resources Assoc.. Urbana, Ill. p. 206-211. United States Geological Survey. 1970, 1972, 1973. Water resources data for Colorado. Part 2. Water Quality Records. U.S.G.S. ~ater Res. Divn. Denver, Colorado. 16