Appendix A. A graph showing the relationship between heat sum and number of frost days along altitudinal gradients in the study regions. Jake M. Alexander Peter J. Edwards Myriam Poll Catherine G. Parks Hansjörg Dietz 10.6084/m9.figshare.3530678.v1 https://wiley.figshare.com/articles/dataset/Appendix_A_A_graph_showing_the_relationship_between_heat_sum_and_number_of_frost_days_along_altitudinal_gradients_in_the_study_regions_/3530678 A graph showing the relationship between heat sum and number of frost days along altitudinal gradients in the study regions. 2016-08-05 09:22:02 USA Wallowa Mountains reciprocal design Swiss Alps altitude seed size Oregon alien plant invasion niche conservatism environmental gradient Environmental Science Ecology