Life Sciences Commons^™

Glover's Silkmoth, Hyalophora Gloveri (Strecker) (Lepidoptera: Saturniidae), New To British Columbia, R. A. Cannings, C. S. Guppy

Aspen Bibliography

Two rather common species of giant silkrnoths of the subfamily Satumiinae (Lepidoptera: Satumiidae) occur in southern British Columbia. Both species, the Polyphemus Moth (Antheraea polyphemus [Cramer]) and the Ceanothus Silkrnoth (Hyalophora euryalis [Bois-duvall) are large and spectacular, and evoke comment from anyone who sees them. Both range northwards to at least the central Cariboo region. Three other striking species of the subfamily occur in the Peace River district of Alberta, but these moths, the Cecropia Moth (Hyalophora cecropia [Linnaeus]), the Columbia Silkmoth (H. columbia [S.L Smith]), and Glover's Silkrnoth (H. gloveri [Strecker l) have never …

Forage Quality In Burned And Unburned Aspen Communities, N.V. Debyle, P.J. Urness, D.L. Blank

Aspen Bibliography

We assessed the effects of fire on the quality of herbaceous and browse forage for elk (Gervus e/aphus) and domestic sheep in the aspen (Populus tremu/oides) forest type. Selected forage species were sampled on burned and adjacent unburned areas during the summers of the first and second years after autumn prescribed burning of three sites in southeastern Idaho. These samples were analyzed for in vitro dry matter digestibility (IVDMD), crude protein, calcium, and phosphorus. This aspen type has a highly nutritious understory irrespective of burning. We found additional improvement in forage quality as a result of prescribed burning. In the …

Modeling Forest Dynamics Based On Stand Level Resource Allocation, Geoffrey Candler Poole

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

An ecologically based model of forest succession is presented. In the model, trees compete for a share of limited growth resources available from their environment. Competition is reflected by each tree's effect on the resource pool and is not explicitly modeled. Model parameters were fit to field data from subalpine forests of the Rocky Mountains. A technique for estimating model parameters from understory-tolerance rankings and silvical characteristics of each species is also presented. The model's output was consistent with our current understanding of forest dynamics. Emergent properties of the model also mimicked natural processes such as self-thinning, release, and maximum …

Using Computer Imaging To Assess Visual Impacts Of Forest Insect And Disease Pests, Daniel Rabin

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Forest insect and disease pests alter the appearance of trees, thereby impacting visual resources. Because of the complexity of most forest landscapes, the degree of visual impact of pest-infested forest stands is difficult to quantify.

This paper describes a method of measuring visual impacts of pest-infested forest stands. Photographs of healthy Ponderosa pine trees were entered into a computer video-image-processing system. Using this system, images of trees were altered to simulate different degrees of infestation by limb rust, a forest pathogen.

The altered and unaltered images were shown to groups of observers who rated the scenes in terms of "scenic …

Growth Of Nitrogen-Fertilized And Thinned Quaking Aspen (Populus Tremuloides Michx.), Donald A. Perala, P.R. Laidly

Aspen Bibliography

Crop trees of quaking aspen (Populus tremuloides Michx.) and its Eurasian equivalent, P. tremula L., grow faster after thinning.