Digital Commons Network^™

Costs And Benefits Of An Extended Phenotype: Chambers Made By Manduca Sexta Larvae, Jonathan Cooley Sprague

Graduate Student Theses, Dissertations, & Professional Papers

Extended phenotypes can serve interesting physiological functions and their externality provides ready opportunity to manipulate and examine their functions and costs. One such set of extended phenotypes are below-ground pupation chambers made by a wide range of insects and whose function is unknown and costs unquantified. We use a series of lab and field experiments to examine the cost and benefit of chambers made by the hawkmoth, Manduca sexta (Sphingidae), whose larvae lose up to 60% of their body mass during chamber construction. Our study shows that these chambers provide critically important free space in which individuals transition from larvae …

Exploring Detracting Elements And Coping Mechanisms Reported In Four Trails Along The Going-To-The-Sun Road Corridor In Glacier National Park, Diana Maritza Bedoya

Graduate Student Theses, Dissertations, & Professional Papers

The results of the ongoing study to monitor visitors use, and the shuttle experience in Glacier National Park demonstrate that use levels in the park have increased considerably. Thus, it was pertinent to evaluate to which extent the conditions on the trails are so undesirable or unexpected for visitors that they would usually employ coping responses to deal with those situations. This research was structured to provide a description of the salient setting attributes and personal factors associated with the identification of the detracting elements of the recreational experiences, and types of coping mechanisms usually used. The study reported here …

Land-Cover Change Within The Peatlands Along The Rocky Mountain Front, Montana: 1937-2009, Joseph Tyler Milbrath

Graduate Student Theses, Dissertations, & Professional Papers

Aerial photographs of nine peatlands along the Rocky Mountain Front, Montana, were analyzed in a GIS. The boundary of wetland extent was hand-digitized and the area within was classified into land-cover types including: total area, open fen, open water, woody vegetation, and non-wetland/agriculture. Changes in wetland extent and land-cover categories were evaluated from the earliest available imagery in 1937 to the last available imagery in 2009. Images prior to 1995 were orthorectified to correct inherent distortions. Results indicate little change in overall peatland area between 1937 and 2009 despite increasing air temperatures in the region. Open water area and the …

Locomotor Ontogeny And The Evolution Of Avian Flight, Ashley Margaret Heers

Graduate Student Theses, Dissertations, & Professional Papers

Understanding the origins of organismal diversity is one of biology's most enduring quests. Many authors have posited that modularity, or the developmental decoupling of body parts into discrete functional units, facilitates adaptive radiation by allowing body parts to become independently and functionally specialized without compromising one another. This may be particularly true in birds, which have compartmentalized the single locomotor unit of their ancestors into discrete wing and leg locomotor modules, and exploited terrestrial and aerial environments. Specializing one set of limbs for terrestrial locomotion and one set for flight presumably facilitates navigation of aerial environments without compromising terrestrial locomotion, …

Developmental Stress In Birds: Phenotypic And Fitness, Ondi L. Crino

Graduate Student Theses, Dissertations, & Professional Papers

The environment animals experience during development can have important effects on phenotype, performance, and fitness across multiple life-history stages. Environmental cues experienced during development can provide information to animals about the environment they will soon inhabit and promote phenotypic changes which affect fitness. Increasing evidence suggests that physiological stress may be one such cue that conveys environmental information to developing animals. Here, I explore the short- and long-term consequences of developmental stress in captive and free-living birds. In chapter one, I explore the effects of developmental stress on body size and physiological stress responses across life-history stages in zebra finches …

Age-Associated Changes In The Neuroinflammatory Response To Toll-Like Receptor 4 And 9 Stimulation, Leah Beth Christensen

Graduate Student Theses, Dissertations, & Professional Papers

During the perinatal time period, the mammalian brain is developing rapidly and is particularly sensitive to inflammation. Inflammation during this time period may be linked to later neurological illness in humans. Disease-associated alterations in learning and behavior can be modeled in rodents using perinatal immune stimulation with either infectious agents or Toll-like receptor (TLR) agonists. Although the gestational period is a particularly sensitive time for neurodevelopment, it is not known for how long after birth this sensitivity persists. In mice, susceptibility to neurological infection declines dramatically during the first weeks of life. Therefore, we sought to compare the neuroinflammatory responses …

Understanding The Dynamics Of Species Distributions Under Climate Change: Linking Empirical Evidence, Ecological Theory, And Statistical Models, Shawn M. Crimmins

Graduate Student Theses, Dissertations, & Professional Papers

Climate change is threatening biota all over the world through dictating changes in species distributions. The ability to predict the effects of climate on species distributions requires an understanding of how climatic and disturbance factors relate to species distributions. I examined the relationship between climate, disturbance, and geographic distributions of vascular plants in the western United States.

Within the mountain ranges of California, woody plants have largely shifted their distributions downhill during the 20th century. These shifts were strongly related to observed changes in climatic water balance, consistent with theoretical predictions. Downhill shifts were most prominent for species occurring at …

The Blackfoot Demonstrative System: Function, Form, And Meaning, Shannon Scott Schupbach

Graduate Student Theses, Dissertations, & Professional Papers

This thesis presents a comprehensive analysis of the Blackfoot demonstrative system. Previous research on Blackfoot (Uhlenbeck 1938, Taylor 1969, Frantz 2009) identifies sixteen morphemes that make up demonstrative words in the language. I propose a demonstrative template that takes into account the fixed morpheme ordering observed in demonstrative forms. Based on the proposed template, I motivate the analysis of the suffix -ka as encoding motion towards the speaker as this accounts for its position together with the suffixes -ya, -ma, and -hka, each of which encode features of motion or visibility. In describing situational functions of each …

The Moral Layers Of Fracking: From Basic Rights And Obligations To Human Flourishing, Angela L. Hotaling

Graduate Student Theses, Dissertations, & Professional Papers

As it is currently being discussed, hydraulic fracturing or “fracking” is the unconventional method of drilling and extracting oil and natural gas. Fracking starts at the earth’s surface where the technology is created and the sites are constructed. The process continues downward: drills pierce thousands of feet vertically and then horizontally underground. Then, millions of gallons of water mixed with sand and chemicals (referred to as “fracking fluid” or “slick water”) are pumped at high pressure through the pipe so as to fracture shale deposits and release gas or oil. Whether to allow fracking and its associated industrial activity is …

The Sweet Grass Hills And Blackfeet Indians: Sacredness, Land, And Institutional Discrimination, Cassie Sheets

Graduate Student Theses, Dissertations, & Professional Papers

The Sweet Grass Hills of north-central Montana are part of the four Tribes of the Blackfoot Confederacy’s traditional territory and play a vital role in perpetuating Blackfeet culture. The Blackfeet Tribe of Montana was forced to sell the Sweet Grass Hills to the federal government in 1888 after the decimation of bison populations. In 1992, the first large-scale corporate mining proposal in the Sweet Grass Hills was proposed by Lehmann and Associates and Manhattan Mineral, Ltd. In response to public outcries, environmental impact statements were issued by the Bureau of Land Management, the agency that manages the area, and Secretary …

Household Organization In The Fur Trade Era: Socioeconomic And Spatial Organizations Of Housepit 54, Alexandra Christine Williams

Graduate Student Theses, Dissertations, & Professional Papers

Households are fundamental units of society that possess powerful explanatory potential; however, few studies have approached household organization during the critical contact period within the Mid-Fraser Canyon. The 2012 excavation of Bridge River’s Housepit 54 (HP 54) offers a rare opportunity to investigate such socioeconomic relationships and their spatial manifestations. Hypotheses structured with a household archaeology theoretical framework emphasize household socioeconomic strategies. The first hypothesis outlines a network strategy characterized by greater centralization of power, hierarchical complexity, and material-wealth that is reflected in residential units with individual features and disparate accumulations of prestige goods and high utility resources. Such floor …

The Effect Of A Cannabinoid Receptor 2 (Cb2) Agonist On Allergic Airway Inflammation In A Mouse Model Of Asthma, Soram Hong

Graduate Student Theses, Dissertations, & Professional Papers

Allergic asthma is a chronic inflammatory disease that affects approximately 300 million people worldwide. The health problem is compounded by the fact that the prevalence of the disease is increasing in the Western world. Thus, there is a continued need for new and improved therapies for the disease. Recently, it has become evident that cannabinoids have immunosuppressive properties and can be used as therapeutics for various inflammatory diseases. The main aim of this study was to explore the anti-inflammatory effects of CB2 agonists on allergic airway inflammation using a mouse model of asthma and resolve any mechanisms that underpin the …

Camouflage Mismatch In Seasonal Coat Color Due To Decreased Snow Duration: Will Snowshoe Hares Keep Up With Climate Change?, Marketa Zimova

Graduate Student Theses, Dissertations, & Professional Papers

As wild species face anthropogenic stressors, they will either adapt, shift their geographic range, or decline, perhaps towards extinction. The relative scope of these responses has not been well studied, especially for climate change where geographic range shifts and population declines have been widely discussed but the potential for adaptation mostly ignored. Adaptation to anthropogenic stressors can occur through phenotypic plasticity and/or evolution. My thesis first establishes, based on field studies of wild snowshoe hares, a novel and high-profile stressor directly linked to climate change. The stressor arises from a decrease in snow duration due to climate change, which causes …

Shifts In Caribou Calving Habitat And Space-Use, Daniella Johanna Dekelaita

Graduate Student Theses, Dissertations, & Professional Papers

The woodland caribou (Rangifer tarandus caribou) population in Newfoundland has been declining since the mid-1990s, and will likely continue to decline into the foreseeable future. This decrease in numbers has been accompanied by a large drop in recruitment. Predation is the primary cause of caribou calf mortality in Newfoundland, and since 2003, >80% of radio-collared calves died within the first 6 months of life. Two Newfoundland herds also have shifted their calving grounds over the past 15 to 20 years. Our objective was to investigate why these shifts have occurred. We analyzed female telemetry locations spanning 29 years, to delineate …

Identifying Environmental Factors Influencing Golden Eagle Presence And Reproductive Success, Ross H. Crandall

Graduate Student Theses, Dissertations, & Professional Papers

Declining populations of plant and animal species is a major concern threatening global biodiversity. If we want to conserve threatened species, we must understand the requirements of the species. Recent data suggests Golden Eagle populations in the Western United States are declining. Future threats from expanded energy development, habitat loss and climate change are also a concern. Apparent declines and perceived threats have caused management agencies to classify the Golden Eagle as a species of concern requiring the creation of conservation plans. Yet, an effective conservation plan is dependent on information that is currently lacking. To address this lack of …

Differentiation-Induced Changes In Antioxidant Capacity And Antioxidant Response In Sh-Sy5y Cells: Role Of Nrf2, Akua Afriyie Karikari

Graduate Student Theses, Dissertations, & Professional Papers

Organisms are exposed to reactive oxygen species from internal metabolism and environmental toxicant exposure, which have been linked to the initiation and progression of many neuronal diseases such as Alzheimer’s and Parkinson’s diseases. Exposure to reactive oxygen species are counterbalanced by antioxidant defense systems such as the Nrf2-ARE pathway, the primary regulator of endogenous antioxidant response. Whereas neuronal cells are post-mitotic and are particularly susceptible to oxidative stress because of high oxygen consumption, astrocytes are mitotic and rely more on glycolytic metabolism. In this study, the difference in antioxidant response and capacity in mitotic and post-mitotic cells were investigated using …

Whole-Nature: Integrating Science And Eco-Phenomenology, Bartholomew Patrick Walsh

Graduate Student Theses, Dissertations, & Professional Papers

A review of the literature in environmental philosophy reveals a certain tension between what we might call science-based and experience-based approaches to environmental ethics. The main trend of thought here follows seminal figures like Aldo Leopold and Holmes Rolston III by generally looking to the sciences for disclosing value in nature, particularly ecology and evolutionary biology. However others, such as David Abram and Jack Turner, worry that scientifically disclosed nature is in itself too distancing, objectifying, and abstract to engender any real care for nature and instead emphasize direct, embodied experience with actual wild places, hence the label “eco-phenomenology.” The …

Effects Of Disturbance On Tree Community Dynamics In Whitebark Pine Ecosystems, Jeremy Travis Amberson

Graduate Student Theses, Dissertations, & Professional Papers

Whitebark pine (Pinus albicaulis), a keystone species of high-elevation ecosystems of western North America, is warranted for listing under the Endangered Species Act due to the combined threats of fire exclusion, white pine blister rust (Cronartium ribicola), and increased pressure from insects due to climate warming. Despite widespread knowledge of the potential causes of the tree’s decline, there is limited understanding of its ecology, including successional dynamics in forests disturbed by white pine blister rust and mountain pine beetle. Specifically, there is a need for more information on successional replacement by subalpine fir and whitebark seedling regeneration dynamics. I assessed …

Current Unrestricted Operating Budgets, Fiscal Year 2013, University Of Montana--Missoula. Office Of Administration And Finance

University of Montana Current Unrestricted Operating Budgets, 1993-2017

The unrestricted operating budget of the University of Montana, issued by the Office of University Planning, Budgeting and Analysis under the Office of Administration and Finance.

Models Of Experimental Competitive Intensities Predict Home And Away Differences In Invasive Impact And The Effects Of An Endophytic Mutualist, Sa Xiao, Ragan M. Callaway, George Newcombe, Erik T. Aschehoug

Biological Sciences Faculty Publications

Understanding the role of competition in the organization of communities is limited in part by the difficulty of extrapolating the outcomes of small-scale experiments to how such outcomes might affect the distribution and abundance of species. We modeled the community-level outcomes of competition, using experimentally derived competitive effects and responses between an exotic invasive plant, Centaurea stoebe, and species from both its native and nonnative ranges and using changes in these effects and responses elicited by experimentally establishing symbioses between C. stoebe and fungal endophytes. Using relative interaction intensities (RIIs) and holding other life-history factors constant, individual-based and spatially explicit …

Positive Relationships Between Association Strength And Phenotypic Similarity Characterize The Assembly Of Mixed-Species Bird Flocks Worldwide, Hari Sridhar, Umesh Srinivasan, Robert A. Askins, Julio Cesar Canales Delgadillo, Chao-Chieh Chen, David N. Ewert, George A. Gale, Eben Goodale, Wendy K. Gram, Patrick J. Hart, Keith A. Hobson, Richard L. Hutto, Sarath W. Kotagama, Jessie Knowlton, Tien Ming Lee, Charles A. Munn, Somchai Nimnuan, B. Z. Nizam, Gillaume Péron, V. V. Robin, Amanda D. Rodewald, Paul G. Rodewald, Robert L. Thomson, Pranav Trivedi, Steven L. Van Wilgenburg, Kartik Shanker

Biological Sciences Faculty Publications

Competition theory predicts that local communities should consist of species that are more dissimilar than expected by chance. We find a strikingly different pattern in a multicontinent data set (55 presence-absence matrices from 24 locations) on the composition of mixed-species bird flocks, which are important sub-units of local bird communities the world over. By using null models and randomization tests followed by meta-analysis, we find the association strengths of species in flocks to be strongly related to similarity in body size and foraging behavior and higher for congeneric compared with noncongeneric species pairs. Given the local spatial scales of our …

December 2012 News Releases, University Of Montana--Missoula. Office Of University Relations

University of Montana News Releases, 1928, 1956-present

No abstract provided.

Montana Kaimin, November 30, 2012, Students Of The University Of Montana, Missoula

Montana Kaimin, 1898-present

Student newspaper of the University of Montana, Missoula.

Montana Kaimin, November 28, 2012, Students Of The University Of Montana, Missoula

Montana Kaimin, 1898-present

Student newspaper of the University of Montana, Missoula.

Montana Kaimin, November 15, 2012, Students Of The University Of Montana, Missoula

Montana Kaimin, 1898-present

Student newspaper of the University of Montana, Missoula.

Montana Kaimin, November 14, 2012, Students Of The University Of Montana, Missoula

Montana Kaimin, 1898-present

Student newspaper of the University of Montana, Missoula.

November 2012 News Releases, University Of Montana--Missoula. Office Of University Relations

University of Montana News Releases, 1928, 1956-present

No abstract provided.

Montana Kaimin, November 1, 2012, Students Of The University Of Montana, Missoula

Montana Kaimin, 1898-present

Student newspaper of the University of Montana, Missoula.

Montana Kaimin, October 30, 2012, Students Of The University Of Montana, Missoula

Montana Kaimin, 1898-present

Student newspaper of the University of Montana, Missoula.

Montana Kaimin, October 26, 2012, Students Of The University Of Montana, Missoula

Montana Kaimin, 1898-present

Student newspaper of the University of Montana, Missoula.