<p> Soil health assessment uses a combination of potential indicators affecting soil processes to comprehensively monitor soil change, caused by cropping systems and soil management. The objectives of the study were to assess the effects of selected cropping systems, soil management and landscape slope positions on the soil health characteristics of the Sanborn Field long-term experimental study in Columbia, Missouri, United States. Soil samples were collected on each of four dates over two years (8^th May 2014, 4^th September 2014, 1^st April 2016, and 18^th August 2016) from selected plots to address each objective, and these time samples were used as replications. Soil physical, chemical, and biological characteristics were analyzed in the laboratory for these samples to assess soil health using the Cornell Comprehensive Assessment of Soil Health (CASH) method. To assess soil health in this study, soil health scoring was determined used R-studio version 1.1.149 to relate the interaction of cropping systems, soil management, and slope positions. Most soil resources on Sanborn Field are a poorly-drained claypan soil classified as a Mexico silt loam (fine, smectitic, mesic Vertic Epiaqualf). In addition, soil samples collected from Tucker Prairie was used as a proxy for the original state of Sanborn Field soils. The first study was conducted to evaluate the effects of long-term cropping systems on soil health properties. The results from the characterization indicated that continuous timothy (<i>Phleum pretense</i> L.) and warm season grass treatments were classified with very high soil health scores, and the lowest score was found for continuous corn (<i>Zea mays</i> L.). In addition, results showed strong positive linear associations between soil organic carbon, total nitrogen, potentially mineralizable nitrogen, active carbon, microbial biomass, and water stable aggregates; while a strong negative linear correlation existed between each of these properties and bulk density. The second study was conducted to evaluate the effects of long-term annual applications of no fertilizer, full fertilizer, and manure on soil health measurements of selected cropping systems. Different cropping systems, including continuous corn, continuous wheat (<i>Triticum aestivum</i> L.), corn-wheat-red clover (<i>Trifolium pretense</i> L.) rotation, and corn-soybean (<i>Glycine max</i> L.)-wheat rotation treatments were used in this study. Results showed that annual dairy cow (<i>Bos Taurus </i>) manure applications had the greatest effect on all soil health indicators and had the largest overall soil health score compared to full fertility and no fertilizer treatments. Moreover, continuous wheat with manure application presented the best combination of effects on soil properties with the largest score for most soil health indicators and an overall health score of 82 out of 100 classified as very high which is the best. The last study evaluated the effects of landscape slope positions on soil health properties of the long-term experiment. Results showed that the summit position had the highest overall soil health score while the lowest score was found on the shoulder position. However, there were no significant differences along the transect slope for water-stable aggregates and bulk density. There were significant differences along the transect for the biological properties such as soil organic carbon, active carbon, potentially mineralizable nitrogen, and microbial biomass. Results of this study illustrate the effect of selected variables on soil health and provide the recent addition of using biological characteristics to account for soil health properties. It is important to remember that this study of the long-term Sanborn Field experiment is just for a small-sized plot area. Future studies of soil management effects on soil health need to account for their own field conditions and their own unique environment.</p><p>

<div>Documenting trophic relationships in aquatic ecosystems can facilitate understanding of not only system processes, but also the potential responses of food webs to stressors. Often, trophic studies assume consistent behavior and trophic roles among individuals in a population, but intraspecific diet variation, such as individual specialization, can play a critical role in food web complexity and can promote ecosystem resilience. In Lake Michigan, the introduction of invasive species (e.g., zebra mussel, Dreissena polymorpha; quagga mussel, Dreissena bugensis; round goby, Neogobius melanostomus) and reduced nutrient loading has resulted in changes in nutrient dynamics, system productivity, and community composition over the past two decades. As a result, abundances of many forage fish have declined, including alewife (Alosa pseudoharengus) which have historically supported the five dominant salmonid species of Lake Michigan (brown trout, Salmo trutta; Chinook salmon, Oncorhynchus tshawytscha; Coho salmon, Oncorhynchus kisutch; lake trout, Salvelinus namaycush; rainbow trout, Oncorhynchus mykiss). With these ecosystem changes, there is uncertainty as to the extent of how different species of salmonids will transition to alternative prey items (e.g., round goby). Common methods for examining diet patterns and trophic linkages include stomach content analysis, stable isotope ratios (e.g., δ13C and δ15N), and fatty acid composition, but these methods vary in temporal resolution and have differential biases. Furthermore, elucidating agreement of these trophic indicators and whether or not agreement is consistent across species can improve their use in future food web studies. The first research chapter of this thesis investigated the diet complexity of Lake Michigan salmonids by evaluating stomach content composition, diversity, and potential specialized consumption of different alewife lengths. Stomach contents revealed that Chinook salmon almost exclusively consumed alewife and had a lower diet diversity compared to the other four species, which consumed round goby (brown trout and lake trout), aquatic invertebrates (Coho salmon), and terrestrial invertebrates (rainbow trout) in addition to alewife. Although there were clear spatio-temporal and size-related feeding patterns for each species, much of the variation in diet composition and diet diversity was present at the individual-level. Additionally, salmonid species appeared to consume the entire size range of alewife that were available to them and individually specialized on alewife lengths. Due to their reliance on alewife, it is likely that Chinook salmon may be more negatively impacted than other salmonid species if alewife abundance continue to decline in Lake Michigan. The second research chapter assessed the agreement of multiple trophic indicators. Although we found agreement among trophic indicators across the five salmonid species using linear and logistic models, particularly between stomach contents, δ13C, and fatty acid 16:1n-7, there was significant variation in relationships across species, potentially due to variation among salmonids in specific prey items consumed (e.g., alewife and round goby) and species-specific regulation of fatty acids. Additionally, δ15N estimated from stomach contents using linear mixing models were typically greater relative to observed δ15N, which may suggest small alewife were underrepresented in stomachs of 2016 angler-caught salmonids. Lastly, stomach contents underestimated benthic resource use by rainbow trout, which may be related to biases associated with fish collection methods and stomach content analysis. Overall, the results of trophic indicator comparisons indicate that caution should be taken when generalizing trophic relationships across species and to consider biases associated with trophic indicators, especially when relying on a single diet metric.</div>

This thesis is about how people develop attachments to places, and what this means for natural resource management. The concept of ‘sense of place’ is generating strong interest in the domain of natural resource management. In particular, the concept offers considerable potential as a way of integrating social, ecological and economic dimensions of environment. This makes the concept highly relevant to an emerging agenda from a range of disciplines and management approaches concerned with the links between social systems and natural systems at local and regional scales (Berkes and Folke 1998; Cheng Kruger and Daniels 2003; Plumwood 2002).¶ Recent interest in place has led to a research agenda for exploring how this concept can play a greater role in resource management (Cantrill and Senecah 2001). Central to this research agenda are questions of how attachments to places are influenced and how sense of place changes over time. In response to the emerging role of sense of place in natural resource management and the research agenda for exploring this concept, this thesis is concerned with three questions: what are the key influences on sense of place?; what is the relationship between sense of place and activities in practice?; and how do people learn about places and respond to change? To explore these questions, the thesis presents findings from interviews with 40 participants in case studies of the Atherton Tablelands and Woodstock, north Queensland. The research employed a purposeful sampling design with the aim of capturing as many different senses of place as possible within the limits of this study. Participants represented a broad range of land uses, ethnic backgrounds, ages and durations of time in the place of the interview. The data from these interviews were analysed using qualitative methods drawing on grounded theory (Charmanz 2000) and influenced by adaptive theory (Layder 1998). The research included a focus on honouring human experience (Braud and Anderson 1998), and also recognising the importance of prior research on how people develop a sense of place (Piaget 1971; Relph 1976).¶ The analysis showed how sense of place was influenced strongly by childhood experiences, both for people who grew up in the case study locations and for people who grew up elsewhere. Other strong influences on place involved living in a similar environment overseas, seeking profit and having a sense of self focussed on agricultural production. Of particular interest is that for many participants who moved to the case study locations, their sense of the Atherton Tablelands or Woodstock was well developed prior to arriving there. This implies that influencing people’s sense of place once they have arrived in a new place will be difficult. Attempts to influence people’s sense of place before they arrive, or soon after arrival, are more likely to be successful. ¶ The ways that sense of place related to practice are presented as a series of overlapping themes. These include the practice of admiring one’s place from the comfort of home, making the land produce, and engaging with a place through activities such as hunting, camping and fishing. Participants also described the practice of caring for place, such as looking after traditional country and restoring the family farm. ¶ The ways participants learned about their places focussed on their childhood experiences, learning from elders, the role of comparisons between places, and the importance of continuity of experience. Participants described very few ways of learning about their place during adulthood. One of these was seeing places under different conditions, such as during a rat plague or after a bushfire. Another was through involvement in community events such as festivals.¶ In discussing the implications of these findings for natural resource management and policy, the thesis highlights how for several participants the key influences on sense of place were tied to non-economic values. Furthermore, this thesis shows that for many people identity and place were strongly linked and this adds to research that explains why farmers may not behave in economically ‘rational’ ways (Botterill 2001a). The thesis also discusses the links between sense of place and post-productivist values in considering transitions in regional Australia identified by Holmes (2002). The findings of this thesis emphasise the potential role for environmental education during childhood to encourage learning about places. The thesis also discusses the implications of how people learn about their places during adulthood, arguing that further support for festivals and community events can play a significant role in exploring the links between social and ecological systems.¶ In conclusion, the thesis argues that the concept of place continues to offer considerable potential for understanding change in regional Australia, and in particular a grass roots shift towards post-productivist values. This role can be developed by further supporting environmental education in childhood and community events such as festivals which help us to learn about the links between ourselves and our environments.

In this paper, we examine data on U.S. GDP/Capita and natural resource share of GDP by state. We then run growth regressions and build on a previous model of dynamic equations to account for the spatial equilibrium that exists between U.S. states. Our results show that there exists evidence that overinvestment in oil and mining sectors has negative effects on state TFP growth, thus giving positive evidence for the existence of a natural resource curse between U.S. states.

<p> River-associated birds may be valuable indicators of environmental change in riverine ecosystems because they are predators of fishes and therefore often top predators in the aquatic food web. To evaluate the likely scope of one form of change - river restoration through dam removal and the expected return of abundant diadromous fish prey - we: 1) developed an appropriate river bird survey protocol; 2) documented the relative importance of sea-run fish in the diet of four river bird species, bald eagle (<i>Haliaeetus leucocephalus</i>), osprey (<i>Pandion haliaetus</i>), belted kingfisher (<i>Megaceryle alcyon</i>), and tree swallow (<i> Tachycineta bicolor</i>); 3) documented nest distribution and brood size of osprey; and 4) investigated the relationships between river bird abundance and various habitat parameters. We expect these measures will reflect changes to the river system post-dam removal as diadromous fish populations recover, proliferate, and integrate into the food web. Based on species accumulation curves and first-order Jacknifes, we concluded that biweekly or triweekly I5 minute surveys are sufficient to meet our objectives. Within the Penobscot River, stable isotope analysis of river bird diets indicated that marine nutrients are consumed by bald eagle, osprey, and belted kingfishers that reside below the lowermost dam, but not tree swallows. Despite greater connectivity for and abundance of spawning diadromous fishes (particularly river herring), in the Kennebec and Sebasticook Rivers as compare to the Penobscot River, osprey brood size was not significantly larger. We suspect other factors such as competition with bald eagles may be limiting the benefit of large river herring runs to nesting osprey. Finally, an ordination of 26 river bird species and 5 single-species (invertivore - spotted sandpiper, piscivore - osprey; piscivore - bald eagle; insectivore - tree Swallow; and omnivore - American black duck) generalized linear models, I revealed associations between estimated species abundance and water flow, water level, distance from the river mouth (river kilometer), site position in relation to a dam (e.g. above, below, or not at a dam), and adjacent land cover composition.</p>

<p> This contextual essay provides a full description of The Smokey Generation, an applied thesis project designed around creating an interactive website that collects and presents oral histories and digital stories of current and past wildland firefighters, with an initial focus on hotshots (i.e., specific teams of wildland firefighters notable for their high level of training and experience). The framework of the website is intentionally designed to influence the public perception of wildland fire to better support and align with its necessary ecological role. For this project, I analyzed stories collected during 36 interviews of current and past hotshots, using literary analysis techniques to determine the following: What tropes and schemes do hotshots most commonly use when describing fire in the environment and what meanings and values are revealed through those figures of speech? In addition to identifying tropes and schemes used in the collected stories, I compared the meanings and values put forward by those figures of speech with how the firefighters view the role of fire in the environment. My analysis revealed a disconnect, showing casual use of antagonistic figures of speech to describe wildland fires and firefighting actions; this, despite the interviewees&rsquo; actual beliefs about the role of fire in the environment, which indicate an understanding and appreciation of wildland fire, particularly the importance of using fire to restore healthy ecosystems, and a desire to be able to better use fire as a land management tool. To conclude, I discuss how I approached framing and presenting those findings on the website in order to develop a richer, more meaningful conversation around wildland fire through the use of digital storytelling and oral history. The project website can be found at: http://thesmokeygeneration.com. </p>

<p> Issues around sustainably managing freshwater resources are one of the most challenging and timely issues affecting the globe. In response to rising social and ecological complexities, decision makers are faced with designing new policies and programs to effectively govern water resources. This shift towards new freshwater resource management approaches is in line with recent movement toward incentive-based mechanisms such as &ldquo;Investments in Watershed Services&rdquo; (IWS). The western United States contains one of the most concentrated IWS populations, in a time when population growth, intensifying land uses, and climate-induced environmental changes are stressing ecological systems in the region. My dissertation focuses on understanding this new arena of environmental governance aimed at freshwater conservation in the US West. Through three sets of data and analytical lenses I explore: the characterization of this new arena of governance, what led to its recent and significant growth, and what changes have occurred with respect to how such water resources were traditionally governed. I employ a mixed methods approach, using quantitative approaches to characterize the study population and temporal changes, and qualitative approaches to dive deeper into understanding specific phenomena. First, I improve understanding of IWS as an institution, and demonstrate the importance of dynamics between institutional factors for external context, program structure, and other related analytical domains in shaping how PWS is applied to water resources challenges globally. Through an institutional analysis of IWS and the use of cluster analysis to group programs around buyer types and management actions, I highlight the role of government, influence of geographic context, and role of both regional and local conditions in shaping IWS design and structure. Second, I demonstrate that government actors are essential to IWS in the region, expanding beyond existing regulations and traditional roles. This exploration of the role of government within adaptive governance shows the evolving and expanding role of government over time, from federal regulations driving early water quality management, then state legislation driving water quantity programs, and more recently, federal agencies partnering on local water source protection efforts. Third, I show how key individuals and organizations create voluntary IWS in response to risk, aligning policies, politics and problems into solution framing, which suggests policy process theories more explicitly consider social-ecological complexities. These programs constitute the most recent expansion of IWS in the US West, and applying a policy process theory sheds light into the formation of the IWS, and the political, economic, ecological and social components that aligned to make the programs possible. My research shows this new arena of environmental governance as adaptive, place and problem-based, learning and collaboration-focused, accepting of uncertainty, and containing nimble and adaptive government across scale. My work also creates a baseline of IWS in the region, and identifies areas for future research as IWS matures over time.</p>

<p> Interest in renewable energy and governmental mandates has motivated land managers to consider cellulosic feedstocks for bioenergy. I investigated plant community response to a system including switchgrass (<i> Panicum virgatum</i>) as a feedstock intercropped with loblolly pine (<i>Pinus taeda</i>). I estimated plant species evenness, richness, and diversity and biomass production, with emphasis on white-tailed deer (<i> Odocoileus virginianus</i>) forages. I detected 225 species in 2,220 1-m² quadrats, and 7,495 biomass samples (96.4 kg dry weight) from 960 quadrats. Intercropping reduced plant species diversity, total non-pine tree biomass, and biomass of deer forages during switchgrass establishment. These effects were no longer apparent at treatment level two years after switchgrass establishment, except that deer browse and total deer forage biomass remained less in intercropped interbeds. Intercropping in managed pines may temporarily effect plant communities but further studies are needed to examine longer term effects and to quantify effects on nutritional carrying capacity for deer.</p>

<p> To avoid unintended complications of invasive species eradication, it is important to understand the potential implications of the techniques used in species eradication efforts. This study aimed to compare how different methods of removing <i>Malephora crocea</i> affect the survivorship of planted seedlings of native perennial plants on Anacapa Island. Employing a randomized complete block design in an <i>M. crocea</i> stand, three removal treatments were tested: 1) hand-pull; 2) spray with herbicide and leave skeletons; and 3) spray and then remove skeletons after 2.5 months. In each treatment, seedlings of three species (<i>Leptosyne gigantea, Frankenia salina</i>, and <i>Grindelia stricta</i>) and seeds of two species (<i>L. gigantea</i> and <i>G. stricta</i>) were planted. Survivorship and seed establishment were monitored quarterly between March 2010 and January 2011. For transplanted seedlings, the spray-and-leave treatment resulted in higher survivorship, while no difference was observed between the pull-treatments. Seed establishment was very low overall, but results of seeding of <i>G. stricta</i> showed that the spray-and-pull treatment provided for higher establishment than other treatments. <i> L. gigantea</i> seed establishment was inconclusive. The spray-and-leave treatment also provided the highest relative soil moisture. My results suggest that the spray-and-leave treatment provided the most suitable conditions for survival of transplanted native perennial vegetation.</p>

<p> The road network in the U.S. is immense, and vehicle use has expanded to incredible proportions since the early 1900s. While the use of this network has proven useful to people, roads and vehicles cause severe environmental degradation. An important part of this degradation is direct mortality of wildlife due to road-kill, with some estimates of vertebrate fatalities reaching the hundreds of millions each year in the U.S. alone. Until the last few decades, little attention was given to the problem of road-kill. A few recent studies have conducted statistical and GIS analyses to identify and predict locations of road-kill in order to strategically implement mitigation strategies. These road-kill studies focused on few species and/or limited study areas. </p><p> In the U.S., suburban areas have been expanding in recent years, but have been largely absent from the research on road-kill. This study investigates road-kill of the small vertebrate community on the fringe of the St. Louis metropolitan area and identifies significant land use/land cover attributes surrounding road-kill and hotspot locations using logistic regression models and hotspot analyses. The findings clearly show that rates of road-kill in this area are substantial and worthy of mitigation. Locations were identified for reducing overall rates of road-kill, such as areas nearer to forest fragments and farther from cultivated lands that are surrounded by greater amounts of open and low intensity developed areas and lesser amounts of cultivated lands. If mitigation were targeted in locations identified in this study, it could lead to reductions of thousands of road-kills each year.</p>