The region considered is on the west side of the Rocky Mountain range in the vicinity of Fraser in the Arapahoe Mountains, Colorado-the Arapahoe National Forest. On many of the tributaries of the Fraser River are little lakes of rather recent origin caused by the building of dams by the beaver. At one time the beaver were numerous, it is only in recent years that they have returned. On the borders of these lakes are several species of Carex, much Phleum alpinum, Calamagrostis, Salix irrorata. The new beaver dams have caused the destruction of the lodge pole pine in the old swamp. The Englemann spruce apparently can stand submergence longer than the pine. The flood plain of the Fraser river is flanked on each side by a mesa which here and there produces scattered groves of lodge pole pine, but the dominating plant is the Sage brush (Artemisia tridentata, and such types as Stipa, Bouteloua oligostachya, Agropyron Smithii, A. dasystachyum, Orthocarpus, etc.) A most marked feature is the zonal distribution of plants on the slope and the more or less level ground, Bouteolua, Agropyron and Artemisia occupying different zones.
Proceedings of the Iowa Academy of Science
©1924 Iowa Academy of Science, Inc.
Pammel, L. H.
"Ecological Notes in the Arapahoe Mountains near Fraser, Colorado,"
Proceedings of the Iowa Academy of Science, 31(1), 133-133.
Available at: https://scholarworks.uni.edu/pias/vol31/iss1/29