Large carnivores in the United States are making a comeback following decades of systematic eradication. Black bears (Ursus americanus), cougars (Puma concolor), and gray wolves (Canis lupus) may recolonize the midwestern United States provided there is substantial suitable habitat. However, viability of large carnivore populations is as dependent on social acceptance as on biological factors. I developed individual and combined models of suitable habitat for black bears, cougars, and wolves in 18 midwestern states using geospatial data, expert-opinion surveys, and multi-criteria evaluation. I also assessed attitudes and perceptions of Illinois citizens about large carnivores via a mail-in survey. Experts indicated land cover was the most important variable for predicting potential habitat for black bears and cougars; human density was the most influential variable for wolves. Large, contiguous areas of suitable habitat comprised 35%, 21%, and 13% of the study region for wolves, bears, and cougars, respectively. About 12% of the region was considered suitable for all 3 species. Arkansas, Minnesota, Texas, and Wisconsin had the highest proportions (>40%) of suitable habitat for black bears; Arkansas, Michigan, Missouri, Texas, and Wisconsin had the most (≥20%) suitable cougar habitat; and only 4 states in the study region contained <29% suitable wolf habitat. Models were validated by comparing suitability values of independent sets of known carnivore locations to those of random locations, and models appeared accurate. More than 70% of survey respondents (n = 791) were male and their average age was 60; 55% were hunters. Approximately 40% were unsure about the population status of large carnivores in Illinois; of the remaining respondents, most (ranging from 20% for black bears to 41% for cougars) believed the presence of all 3 species had increased over the past decade. More residents supported protection (43%) and increasing numbers of large carnivores (39%) than opposed them (26%), although support for black bears was slightly higher than for cougars and wolves. Rural residents and livestock owners were the most likely to want carnivore numbers to decrease and least likely to support their protection; higher levels of education corresponded to positive attitudes toward large carnivores. My research provides the foundation for well-informed management plans, policy decisions, and educational initiatives for large carnivores in midwestern states where large carnivore populations have been absent for decades.

When inhaled, bioaerosols exacerbate respiratory symptoms and diseases. Mitigating the negative health impacts of bioaerosols requires a robust understanding of the temporal and spatial dynamics of bioaerosols in the atmosphere as a function of their type (e.g., bacteria, fungal spores, plant pollens) and particle size, which determines their penetration into the respiratory tract. While it is known that bioaerosol concentrations vary by location, season and meteorological conditions, major gaps remain in understanding the co-occurrence of bioaerosols with one another, their size in the atmosphere, and their mass contributions to PM. Overall, research presented in this thesis advances the current knowledge about bioaerosols (including fungal spores, pollens, and bacteria) in following ways: 1) defining background and urban levels of bioaerosol concentrations in the Midwestern US across four seasons, 2) characterizing ambient bioaerosol and co-pollutant mixtures, 3) determining the influence of meteorology on their concentrations and size distributions, and 4) estimating bioaerosol contributions to PM mass. The spatial analysis of respirable particulate matter (PM10) across urban and background sites in Iowa demonstrated that urban areas are a source of fungal glucans, bacterial endotoxins and total proteins, which gives rise to significantly enhanced bioaerosols in urban locations compared to background sites. Similar urban enhancements in calcium—a crustal element—and its correlation with endotoxins suggested that wind-blown soil is likely the origin. Seasonally, fungal spores peaked in summer with temperature, while bacterial endotoxins peaked in autumn during the row crop harvesting season. Fungal spores, bacterial endotoxins, plant and animal detritus all peaked during the growing season, such that maximum exposures to multiple bioaerosol types concurrently. Under the influence of rain chemical tracers of pollens peaked and decreased in size from coarse (2.5-10 µm) to fine particles (< 2.5 µm), likely due to the osmotic rupture of pollen grains upon wetting. While fine-sized fungal spores also increased during rain events, maximum spore levels were observed in coarse-sized particles post-rain. The comparison of spring to late summer measurements demonstrated these influences of precipitation on bioaerosols also occur during late summer, when fungal spore levels are high and ragweed is the dominant pollen source. The ability to apportion PM mass to bioaerosols was advanced through the development of chemical profiles of pollens and their integration with chemical mass balance (CMB) source apportionment modeling, for the first time. In late-April to early-May in 2013, pollens were estimated to contribute 0.2 - 38% of PM₁₀ (0.04 – 0.8 µg m⁻³) while fungal spores contributed 0.7 – 17% of PM₁₀ (0.1 – 1.5 µg m⁻³). Collectively, this thesis provides insight into spatial, seasonal and daily variations of bioaerosols, and shows elevated outdoor exposures to bioaerosols among urban populations, with maximum levels occurring during growing seasons, periods of high temperature, and during/immediately following rainfall.

Stable isotopes of mammoths and mastodons have the potential to illuminate ecological changes in late Pleistocene landscapes and megafaunal populations as these species approached extinction. The ecological factors at play in this extinction remain unresolved, but isotopes of bone collagen (δ13C, δ15N) and tooth enamel (δ13C, δ18O, 87Sr/86Sr) from midwestern North America are leveraged to examine ecological and behavioral changes that occurred during the last interglacial-glacial cycle. Both species had significant C3 contributions to their diets and experienced increasing levels of niche overlap as they approached extinction. A subset of mastodons after the last glacial maximum exhibit low δ15N values that may represent expansion into a novel ecological niche, perhaps densely occupied by other herbivores. Stable isotopes from serial and microsampled enamel show increasing seasonality and decreasing temperatures as mammoths transitioned from Marine Isotope Stage (MIS) 5e to glacial conditions (MIS 4, MIS 3, MIS 2). Isotopic variability in enamel suggests mobility patterns and life histories have potentially large impacts on the interpretation of their stable isotope ecology. This study further refines the ecology of midwestern mammoths and mastodons demonstrating increasing seasonality and niche overlap as they responded to landscape changes in the final millennia before extinction.

Soil erosion undermines agricultural productivity, limiting the lifespan of civilizations. For agriculture to be sustainable, soil erosion rates must be low enough to maintain fertile soil, as was present in many agricultural landscapes prior to the initiation of farming. However, there have been few measurements of long-term pre-agricultural erosion rates in major agricultural landscapes. We quantified geological erosion rates in the Midwestern U.S., one of the world’s most productive agricultural areas. We sampled soil profiles from 14 native prairies and measured concentrations of the cosmogenic nuclide 10Be and chemically immobile elements to calculate physical erosion rates. We used the erosion rates and measurements of topographic curvature to estimate a pre- agricultural topographic diffusion coefficient. We find pre-agricultural erosion rates of 0.0001–0.1 mm yr-1 and a site-averaged diffusion coefficient of 0.005 m2 yr-1. The pre- agricultural erosion rates and diffusion coefficient we measured are both orders of magnitude lower than anthropogenic values previously measured in adjacent agricultural fields. The pre-agricultural erosion rates are one to four orders of magnitude lower than the 1 mm yr-1 soil loss tolerance value assigned to these locations by the U.S. Department of Agriculture. Hence, as currently defined, tolerable soil loss will lead to unsustainable erosion of Midwestern soils. However, quantifying natural erosion rates via cosmogenic nuclides provides a means for more robustly defining rates of tolerable soil loss and developing management guidelines that promote soil sustainability.

This thesis establishes the concept of Rust Belt aesthetics, a term for the artistic and cultural narratives that define, analyze, critique, or otherwise describe the deindustrialized U.S. Midwest, a region commonly referred to as the Rust Belt. This thesis explores how aesthetic projects re-present the experience of deindustrialization. The locus of this analysis is the region, and the thesis argues that the region operates as a discursive device that can mediate between and through other spatial “levels,” like the local or the global. Rust Belt aesthetics emerge from a moment of regional, national, and global transformations, and these aesthetics can construct the region to various political ends. The thesis analyzes aesthetics projects like advertisements, literature, and visual art in order to provide insight into the shifting economic, cultural, and social forces at play in the region and beyond. The goal of my analysis is not to arrive at a static definition of Rust Belt aesthetics. Instead, I hope to understand how aesthetic projects from and about the region communicate specific narratives about the Rust Belt, often through the lens of critical regionalism and the everyday life of the working class. / Thesis / Doctor of Philosophy (PhD)

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Indiana University-Purdue University Indianapolis (IUPUI) / This thesis will investigate the effect of extractive industries on the economy of an average Midwestern town from the mid-1800s until the conclusion of the WWII. Primary and secondary sources were studied to gain an understanding of the effect of extractive industries on the development of Midland Michigan. Due to its complete reliance on extractive industries for its economic welfare Midland suffered extreme economic upheavals. In conclusion Midland’s intensive boom and bust economy mirrors Michigan’s own rocky relationship with extractive industries.

These stories examine the lives of working class people in light of the current economic and social climate. They address and attempt to empathize with the despair and disillusionment many working class Americans express in response to their economic and social realities, and the stories attempt to walk a non-judgmental line regarding the attitudes these characters espouse. Instead of judging the characters or championing a particular moral stance, the pieces attempt to present individuals faced with major failures: child abandonment, guilt over preventable death, overriding selfishness, racism, and shame regarding social status. These failures of character or morality echo the larger failings, as the characters perceive them, of their time and place. Within this worldview of disillusionment and despair, many of the characters in these stories choose to struggle toward self-betterment—not economic or social betterment per se, but individual betterment, a reckoning with themselves and their failures that necessarily reflects and interacts with the world they inhabit. These are stories rooted in the Midwest and its rust-belt inhabitants, but for all their contemporary socio-economic concerns, the stories are first and foremost concerned with the individual and representing each individual portrayed accurately and honestly. / Master of Fine Arts

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