Do Pine Trees in Aspen Stands Increase Bird Diversity
Contribution to Book
Sustaining aspen in western landscapes: symposium proceedings, June 3-15, 2000, Grand Junction, CO. Fort Collins, CO. USDA Forest Service, Rocky Mountain Research Station, 460 pp.
WD Shepperd, D Binkley, DL Bartos, TJ Stohlgren, and LG Eskew compilers
In the Black Hills of South Dakota, quaking aspen (Populus tremuloides) is being replaced by conifers through fire suppression and successional processes. Al- though the Black Hills National forest is removing conifers (primarily ponderosa pine [Pinus ponderosa])toincreasetheaspencommunitiesinsomemixedstands,ForestPlan guidelines allow four conifers per hectare to remain to increase diversity in the remaining aspen stand. We compared bird species richness in pure ponderosa pine, mixed stands dominated by ponderosa pine with quaking aspen, mixed stands dominated by aspen
with ponderosa pine, and pure aspen stands. Stands dominated by ponderosa pine had lower (P <0.01) bird species richness than stands dominated by aspen, Aspen in ponderosa pine stands or pine in aspen stands did not increase bird species richness (P ≥0.68) over the respective pure stands. Thus, leavingponderosa pine in aspen stands will not have the desiredeffectofincreasing birddiversitybutmayhave thenegativeeffect of speeding successional processes that rep/ace aspen with conifers.
Rumble, Mark A.; Mills, Todd R.; Dystra, Brian L.; and Flake, Lester D., "Do Pine Trees in Aspen Stands Increase Bird Diversity" (2001). Aspen Bibliography. Paper 510.