Answers are grounded in this paper and cite their sources.
M. G. Barbour, N. H. Berg, T. G. F. Kittel, M. E. Kunz, Snowpack and the Distribution of a Major Vegetation Ecotone in the Sierra Nevada of California, Journal of Biogeography, Vol. 18, No. 2 (Mar., 1991), pp. 141-149
No takes yet. Share an insight, caveat, or question.
Barbour et al. (1991) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: