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Morphometric Evaluation Of The Whitefish Complex In Bear Lake, Utah/Idaho, Alan Ward

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Whitefish populations around the world have long been difficult to categorize taxonomically. The whitefish of Bear Lake, Utah/Idaho are no exception. There are three recognized species of Prosopium that are endemic to the lake. Two of these species, Prosopium spilonotus and Prosopium abyssicota, have previously been indistinguishable outside of spawning times. Previous studies have proposed additional taxa within P. spi/onotus to further complicate the identification among these taxa.

Morphological characteristics were quantified on wild whitefish from Bear Lake, as well as from progeny reared in the laboratory from the wild adult fish. The purported taxa were separated in the field …

A Dynamic Analysis Of The Global Timber Market Under Global Warming: An Integrated Modeling Approach, Dug Man Lee, Kenneth S. Lyon

Economic Research Institute Study Papers

We developed a dynamic integrated modeling approach to identify the effect of global warming on the global timber market. The Timber Supply Model 2000, BlOME 3, and Hamburg were used as a suitable economic and ecological model. The TSM 2000 was adopted to model dynamic economic behavior in the global timber market. BlOME 3 was utilized as our steady state ecological model, and Hamburg as our general circulation model. The TSM 200 was developed to consider more important up-to-date components in the global timber market. We estimated dynamic ecological change based on the simulation results of BlOME 3 using Hamburg …

Chapter 08: Conclusions And Recommendations, David Layne Coppock, Corinne Valdivia, Jim Yazman, Christian Jetté, João S. De Queiroz, Lisa Markowitz, Isaac M. Ortega

Sustaining Agropastoralism on the Bolivian Altiplano: The Case of San José Llanga

Here we review brief summaries by chapter and then derive some integrated conclusions across chapters. Recommendations are presented with respect to further research, outreach and policy consideration. Because several years have passed between the end of our field work and publication of this synthesis volume, we end with an epilogue that highlights changes and key events that happened at San José Llanga (SJL) and with collaborating institutions in Bolivia between 1996-9.

Fungi Associated With Biological Soil Crusts In Desert Grasslands Of Utah And Wyoming, Jack S. States, Martha Christensen

Canyonlands Research Bibliography

No abstract provided.

Effects Of Recording Media On Echolocation Data From Broadband Bat Detectors, Ethan P. White, S. D. Gehrt

Biology Faculty Publications

Bat detectors are an important tool for ecological studies of bats. However, the quality and quantity of data may be affected by the recording devices used to record the output from the detector. We compared recordings of bat activity from audiocassette recorders and computers. Numbers of calls/hour, passes/hour, identifiable passes/hour, and feeding buzzes/hour were similar (all P’s > 0.1) between recording devices. All call characteristics, except for the minimum frequency and characteristic frequency, differed (P < 0.05) between tapes and computers. Species identification with discriminate function analysis was less reliable with tape data than with computer data, particularly when the model built with computer-recorded reference calls was tested with tape-recorded calls. Therefore, we suggest when tape recorders are used for field recording that they also are used to record reference calls.

A Critical Evaluation Of Research Techniques In Animal Ecology, Michelle A. Baker

Biology Faculty Publications

No abstract provided.

Ecology Readings From The University Of Wisconsin, Michelle A. Baker

Michelle A. Baker

No abstract provided.

Long-Term Aspen Exclosures In The Yellowstone Ecosystem, Charles E. Kay

Aspen Bibliography

Aspen has been declining in the Yellowstone Ecosystem for more than 80 years. Some authors have suggested that aspen is a marginal plant community in Yellowstone and that recent climatic variation has adversely affected aspen, while others contend that excessive browsing by native ungulates is primarily responsible for aspen’s widespread decline. To test these hypotheses, I measured all the long-term aspen exclosures (n = 14) in the Yellowstone Ecosystem. Aspen stands inside all exclosures successfully produced new stems greater than 2 m tall without fire or other disturbance, while few outside stands successfully regenerated due to repeated browsing. Understory species …

Persistence Of Aspen Regeneration Near The National Elk Refuge And Gros Ventre Valley Elk Feedgrounds Of Wyoming, D.T. Barnett, T.J. Stohlgren

Aspen Bibliography

We investigated aspen (Populus tremuloides) regeneration in the Gros Ventre River Valley, the National Elk Refuge, and a small part of Grand Teton National Park, Wyoming, to see if elk (Cervus elaphus) browsing was as damaging as previously thought. We conducted a landscape-scale survey to assess aspen regeneration across gradients of wintering elk concentrations using 68 randomly selected aspen stands in the 1,090 km2 study area. Forty-four percent of the stands sampled supported regeneration of saplings (stems greater than 2 m in height but less than 10 cm in diameter). There were no significant differences of regeneration across elk winter …