Human Ecology Commons^™

An Evaluation Of The Food Web Dynamics And Predator Prey Interactions In Scofield Reservoir, Lisa K. Winters

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Reservoirs are artificial, dynamic, and highly manipulated systems, where the appearance of either intentionally or unintentionally introduced species may disrupt interactions within an already complex food web. In some situations, a top predator fish may be stocked as a biological control agent, if these fish-eating predators monopolize on the nuisance and unwelcome prey. Scofield Reservoir, Utah has historically been an extremely popular blue-ribbon fishery. However, a recent decrease in rainbow trout catch and increase in the minnow, Utah chub, have made it difficult to find a balance between providing the public with a trophy sport fishery and maintaining an ecologically …

Exploring A Stable Aspen Niche Within Aspen-Conifer Forests Of Utah, Cody M. Mittanck

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study addresses a critical issue faced by resource managers confronting aspen restoration projects in the Intermountain West. Quaking aspen (Populus tremuloides Michx.) forests have received a large amount of popular and academic attention over the last decade due to concerns over decline. As a result, both private and public forest resource managers have focused attention on actively restoring aspen communities through treatments such as prescribed burning, logging, and grazing exclosures to name a few. There is increasing evidence suggesting the existence of "stable" aspen communities. This community type undergoes processes entirely different from successional aspen communities and …

Assessment Of Atmospheric Nitrogen Deposition: Possible Effects On Alpine Ecosystems Above 9000 Feet In Grand Teton National Park, Jennifer Hansen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Certain forms of nitrogen (N) in the atmosphere are pollutants with effects that mimic fertilizer application. If there is too much N, it can become a stressor, and the ecosystem may undergo drastic changes (e.g. certain plant species may decline or disappear). The N load at which a system starts exhibiting negative effects is dependent on the type and location of the ecosystem. Alpine ecosystems (i.e. above 9000 feet in Wyoming) may be particularly sensitive to low levels of atmospheric N input because of short growing seasons, sparse plant cover, and shallow soils that limit their ability to absorb the …

Breeding Bird Populations And Habitat Utilization In Aspen Stands Of Upper Logan Canyon, Janet L. Young

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Censuses of two 20-acre plots in upper Logan Canyon, Utah, were made by the spot-mapping method during 1970 and 1971 to determine the differences in composition and density of breeding-bird populations in aspen stands of significantly different density and stature. The less dense stand of greater average d.b.h., average height and per cent ground cover had 20 breeding species totalling 615 pairs per 100 acres (expressed as equivalent territories). The more dense stand of smaller trees and brushy undergrowth had 14 breeding species with 267.5 equivalent territories per 100 acres. Nine species were found on both areas. Observations of foraging …

The Spruce Gall Aphid Adelges Cooleyi (Gill) In Utah., Lagrande Stirland

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This paper is the result of research started on the Campus of the Utah State Agricultural College in the Spring of 1928. It is the intention of the writer to give the economic importance of the insect in the State; kind and extent of damage done by the insect, life history and control of the insect as far as it has been found.

The problem is not completed, nor is all the material included the results of the writer's own investigation. However, it has been the object of the writer to study forms as they exist in Utah, and to …