Life Sciences Commons^™

Predatory Hymenopteran Assemblages In Boreal Alaska: Associations With Forest Composition And Post-Fire Succession, Alexandria Wenninger, Teresa Hollingsworth, Diane Wagner

Aspen Bibliography

Changes to the fire regime in boreal Alaska are shifting the ratio of coniferous to deciduous dominance on the landscape. The increase in aspen and birch may have important effects on predatory hymenopteran assemblages by providing a source of extrafloral nectar and increasing prey availability. Furthermore, fire-induced changes in successional age alter habitat structure and microclimate in ways that may favor ants. This study is the first to characterize the influence of fire-related vegetation changes on boreal predatory hymenopteran assemblages. We compare the abundance, species richness, and composition of predatory hymenopteran assemblages among forests at different stages of succession and …

A Multiple‐Scale Assessment Of Long‐Term Aspen Persistence And Elevational Range Shifts In The Colorado Front Range, Mario Bretfeld, Scott B. Franklin, Robert K. Peet

Aspen Bibliography

Aspen forests and woodlands are some of the most species‐rich forest communities in the northern hemisphere. Changing climate, altered disturbance regimes, land use, and increased herbivore pressure threaten these forests both in Eurasia and North America. In addition, rapid mortality dubbed “Sudden Aspen Decline” is a concern for aspen's long‐term presence in the western United States, especially Colorado and Utah. Yet it is still unclear whether aspen is persistent or declining at the landscape scale. We assessed aspen persistence at different spatial scales in the Colorado Front Range by resampling 89 plots containing aspen from among 305 vegetation plots sampled …

Moderate-Scale Mapping Methods Of Aspen Stand Types : A Case Study For Cedar Mountain In Southern Utah, Chad M. Oukrop, David M. Evans, Dale L. Bartos, R. Douglas Ramsey, Ronald J. Ryel

Aspen Bibliography

Quaking aspen (Populus tremuloides Michx.) are the most widely distributed tree species across North America, but its dominance is declining in many areas of the western United States, with certain areas experiencing rapid mortality events over the past decade. The loss of aspen from western landscapes will continue to profoundly impact biological, commercial, and aesthetic resources associated with aspen. However, many options are available for its restoration. Advances in remote sensing technologies offer cost-effective means to produce spatial and quantitative information on the distribution and severity of declining aspen at many scales. This report describes the development and application of …

Aspen Succession And Nitrogen Loading: A Case For Epiphytic Lichens As Bioindicators In The Rocky Mountains, Usa, Paul C. Rogers, Kori D. Moore, Ronald J. Ryel

Wildland Resources Faculty Publications

Question: Can lichen communities be used to assess shortand long-term factors affecting seral quaking aspen (Populus tremuloides) communities at the landscape scale? Location: Bear River Range, within the Rocky Mountains, in northern Utah and southern Idaho, USA. Method: Forty-seven randomly selected mid-elevation aspen stands were sampled for lichens and stand conditions. Plots were characterized according to tree species cover, basal area, stand age, bole scarring, tree damage, and presence of lichen species. We also recorded ammonia emissions with passive sensors at 25 urban and agricultural sites throughout an adjacent populated valley upwind of the forest stands. Nonmetric multidimensional scaling (NMS) …

Do Pine Trees In Aspen Stands Increase Bird Diversity, Mark A. Rumble, Todd R. Mills, Brian L. Dystra, Lester D. Flake

Aspen Bibliography

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

Aspen's Ecological Role In The West, William H. Romme, Lisa Floyd-Hanna, David D. Hanna, Elisabeth Bartlett

Aspen Bibliography

Aspen exhibits a variety of ecological roles. In southern Colorado, the 1880 landscape mosaic contained a range of stand ages, of which half were >70 years old and half were younger. Pure aspen stands in southern Colorado are widespread and may result from previous short fire intervals that eliminated local conifer seed sources. Aspen regeneration in northern Yellowstone Park is controlled by ungulate browsing pressure and fire, so it has been limited since 1920. However, an episode of aspen seedling establishment occurred after the 1988 fires. We urgently need additional detailed, local case studies of aspen ecology to inform management …

Aspen Succession In The Intermountain West: A Deterministic Model, Dale L. Bartos, Frederick R. Ward, George S. Innis

Aspen Bibliography

No abstract provided.

Tree Dynamics In Seral And Stable Aspen Stands Of Central Utah, Roy O. Harniss, Kimball T. Harper

Aspen Bibliography

No abstract provided.

Aspen Community Types On The Caribou And Targhee National Forests In Southeastern Idaho, Walter F. Mueggler, R.B. Campbell, Jr

Aspen Bibliography

No abstract provided.

Wildlife Habitat Investigations And Management Implications On The Bridger-Teton National Forest, G.E. Gruell, M.S. Boyce, L.D. Hayden Wing

Aspen Bibliography

Grazing impact by elk and moose has been a point of concern in Jackson Hole for many years. Concern has been primarily directed towards sparsely vegetated south aspects, aspen stands, and willow bottoms. Numerous transects have quantified heavy foliage utilization. Trend studies have been mostly inconclusive. Study of historical narratives have quantified heavy forage utilization. Trend studies have been mostly inconclusive. Study of historical narratives, early photographs and consideration of plant physiology, soils data, and fire ecology have aided interpretations of vegetal trend and plant succession in recent years. Photographs show little change on sparsely vegetated sites. Soils information on …

A Hydrologic Model Of Aspen-Conifer Succession In The Western United States, Richard A. Jaynes

Aspen Bibliography

No abstract provided.

Classification Of Quaking Aspen Stands In The Black Hills And Bear Lodge Mountains, K.E. Severson, J.F. Thilenius

Aspen Bibliography

No abstract provided.

The Ecological Role Of Fire In The Jackson Hole Area, Northwestern Wyoming, L.L. Loope, G.E. Gruell

Aspen Bibliography

No abstract provided.