This uphill migration of bands occurs as new vegetation grows upslope of the bands and old vegetation dies on the downslope edge. (sciencedaily.com)
«So, essentially, in the past, the beetles sometimes moved upslope from infestations in lodgepole pine, killed some trees and then pooped out.» (trib.com)
Back in the lab, the team simulated the species» shift upslope by transplanting baby trees from lower elevations into soils collected up in the mountains. (scientificamerican.com)