College of Letters & Science
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The College of Letters and Science, the largest center for learning, teaching and research at Montana State University, offers students an excellent liberal arts and sciences education in nearly 50 majors, 25 minors and over 25 graduate degrees within the four areas of the humanities, natural sciences, mathematics and social sciences.
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Item Environmental warming increases the importance of high‐turnover energy channels in stream food webs(Wiley, 2024-05) Junker, James R.; Cross, Wyatt F.; Hood, James M.; Benstead, Jonathan P.; Huryn, Alexander D.; Nelson, Daniel; Ólafsson, Jón S.; Gíslason, Gísli MárWarming temperatures are altering communities and trophic networks across Earth's ecosystems. While the overall influence of warming on food webs is often context-dependent, increasing temperatures are predicted to change communities in two fundamental ways: (1) by reducing average body size and (2) by increasing individual metabolic rates. These warming-induced changes have the potential to influence the distribution of food web fluxes, food web stability, and the relative importance of deterministic and stochastic ecological processes shaping community assembly. Here, we quantified patterns and the relative distribution of organic matter fluxes through stream food webs spanning a broad natural temperature gradient (5–27°C). We then related these patterns to species and community trait distributions of mean body size and population biomass turnover (P:B) within and across streams. We predicted that (1) communities in warmer streams would exhibit smaller body size and higher P:B and (2) organic matter fluxes within warmer communities would increasingly skew toward smaller, higher P:B populations. Across the temperature gradient, warmer communities were characterized by smaller body size (~9% per °C) and higher P:B (~7% faster turnover per °C) populations on average. Additionally, organic matter fluxes within warmer streams were increasingly skewed toward higher P:B populations, demonstrating that warming can restructure organic matter fluxes in both an absolute and relative sense. With warming, the relative distribution of organic matter fluxes was decreasingly likely to arise through the random sorting of species, suggesting stronger selection for traits driving high turnover with increasing temperature. Our study suggests that a warming world will favor energy fluxes through “smaller and faster” populations, and that these changes may be more predictable than previously thought.Item Connecting research and practice to enhance the evolutionary potential of species under climate change(Wiley, 2023-01) Thompson, Laura M. et al.; Beever, Erik A.Resource managers have rarely accounted for evolutionary dynamics in the design or implementation of climate change adaptation strategies. We brought the research and management communities together to identify challenges and opportunities for applying evidence from evolutionary science to support on-the-ground actions intended to enhance species' evolutionary potential. We amalgamated input from natural-resource practitioners and interdisciplinary scientists to identify information needs, current knowledge that can fill those needs, and future avenues for research. Three focal areas that can guide engagement include: (1) recognizing when to act, (2) understanding the feasibility of assessing evolutionary potential, and (3) identifying best management practices. Although researchers commonly propose using molecular methods to estimate genetic diversity and gene flow as key indicators of evolutionary potential, we offer guidance on several additional attributes (and their proxies) that may also guide decision-making, particularly in the absence of genetic data. Finally, we outline existing decision-making frameworks that can help managers compare alternative strategies for supporting evolutionary potential, with the goal of increasing the effective use of evolutionary information, particularly for species of conservation concern. We caution, however, that arguing over nuance can generate confusion; instead, dedicating increased focus on a decision-relevant evidence base may better lend itself to climate adaptation actions.Item A framework to link climate change, food security, and migration: unpacking the agricultural pathway(Springer Science and Business Media LLC, 2024-03) Tuholske, Cascade; Di Landro, Maria Agustina; Anderson, Weston; van Duijne, Robbin Jan; de Sherbinin, AlexResearchers have long hypothesized linkages between climate change, food security, and migration in low- and middle-income countries (LMICs). One such hypothesis is the “agricultural pathway,” which postulates that negative climate change impacts on food production harm livelihoods, which triggers rural out-migration, internally or abroad. Migration is thus an adaptation to cope with the impacts of climate change and bolster livelihoods. Recent evidence suggests that the agriculture pathway is a plausible mechanism to explain climate-related migration. But direct causal connections from climate impacts on food production to livelihood loss to rural out-migration have yet to be fully established. To guide future research on the climate-food-migration nexus, we present a conceptual framework that outlines the components and linkages underpinning the agricultural pathway in LMICs. We build on established environmental-migration conceptual frameworks that have informed empirical research and deepened our understanding of complex human-environmental systems. First, we provide an overview of the conceptual framework and its connection to the agricultural pathway hypothesis in the climate mobility literature. We then outline the primary components and linkages of the conceptual framework as they pertain to LMIC contexts, highlighting current research gaps and challenges relating to the agricultural pathway. Last, we discuss possible future research directions for the climate-food-migration nexus. By highlighting the complex, multiscale, interconnected linkages that underpin the agricultural pathway, our framework unpacks the multiple causal connections that currently lie hidden in the agricultural pathway hypothesis.Item Hazardous heat exposure among incarcerated people in the United States(Springer Science and Business Media LLC, 2024-03) Tuholske, Cascade; Lynch, Victoria D.; Spriggs, Raenita; Ahn, Yoonjung; Raymond, Colin; Nigra, Anne E.; Parks, Robbie M.Climate change is predicted to increase the frequency of potentially hazardous heat conditions across the United States, putting the incarcerated population of 2 million at risk for heat-related health conditions. We evaluate the exposure to potentially hazardous heat for 4,078 continental US carceral facilities during 1982–2020. Results show that the number of hot days per year increased during 1982–2020 for 1,739 carceral facilities, primarily located in the southern United States. State-run carceral facilities in Texas and Florida accounted for 52% of total exposure, despite holding 12% of all incarcerated people. This highlights the urgency for enhanced infrastructure, health system interventions and treatment of incarcerated people, especially under climate change.Item Yellowstone Cutthroat Trout Recovery in Yellowstone Lake: Complex Interactions Among Invasive Species Suppression, Disease, and Climate Change(Wiley, 2023-10) Glassic, Hayley C.; Chagaris, David D.; Guy, Christopher S.; Tronstad, Lusha M.; Lujan, Dominque R.; Briggs, Michelle A.; Albertson, Lindsey K.; Brenden, Travis O.; Walsworth, Timothy E.; Koel, Todd M.n Yellowstone Lake, Wyoming, the largest inland population of nonhybridized Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri, hereafter Cutthroat Trout, declined throughout the 2000s because of predation from invasive Lake Trout Salvelinus namaycush, drought, and whirling disease Myxobolus cerebralis. To maintain ecosystem function and conserve Cutthroat Trout, a Lake Trout gill netting suppression program was established in 1995, decreasing Lake Trout abundance and biomass. Yet, the response of Cutthroat Trout to varying Lake Trout suppression levels, collectively with the influence of disease and climate, is unknown. We developed an ecosystem model (calibrated to historical data) to forecast (2020–2050) whether Cutthroat Trout would achieve recovery benchmarks given disease, varying suppression effort, and climate change. Lake Trout suppression influenced Cutthroat Trout recovery; current suppression effort levels resulted in Cutthroat Trout recovering from historical lows in the early 2000s. However, Cutthroat Trout did not achieve conservation benchmarks when incorporating the influence of disease and climate. Therefore, the National Park Service intends to incorporate age‐specific abundance, spawner biomass, or both in conservation benchmarks to provide better indication of how management actions and environmental conditions influence Cutthroat Trout. Our results illustrate how complex interactions within an ecosystem must be simultaneously considered to establish and achieve realistic benchmarks for species of conservation concern.Item Declines in body size of sockeye salmon associated with increased competition in the ocean(The Royal Society, 2023-02) Ohlberger, Jan; Cline, Timothy J.; Schindler, Daniel E.; Lewis, BertDeclining body sizes have been documented for several species of Pacific salmon; however, whether size declines are caused mainly by ocean warming or other ecological factors, and whether they result primarily from trends in age at maturation or changing growth rates remain poorly understood. We quantified changes in mean body size and contributions from shifting size-at-age and age structure of mature sockeye salmon returning to Bristol Bay, Alaska, over the past 60 years. Mean length declined by 3%, corresponding to a 10% decline in mean body mass, since the early 1960s, though much of this decline occurred since the early 2000s. Changes in size-at-age were the dominant cause of body size declines and were more consistent than trends in age structure among the major rivers that flow into Bristol Bay. Annual variation in size-at-age was largely explained by competition among Bristol Bay sockeye salmon and interspecific competition with other salmon in the North Pacific Ocean. Warm winters were associated with better growth of sockeye salmon, whereas warm summers were associated with reduced growth. Our findings point to competition at sea as the main driver of sockeye salmon size declines, and emphasize the trade-off between fish abundance and body size.Item Narratives and the Policy Process: Applications of the Narrative Policy Framework(Montana State University Library, 2022) Jones, Michael D.; McBeth, Mark K.; Shanahan, Elizabeth A.A long history of literature describes how stories are central to how humans understand and communicate about the world around them. The NPF applies these discoveries to the policy process, whereby narratives are meaning-making tools used to capture attention and influence policy outcomes. Conceived at the Portneuf School of Narrative in the early part of the century and formally named in 2010, the Narrative Policy Framework’s (NPF) initial purpose was to scientifically understand the relationship between narratives and the policy process. Since its seminal naming, the NPF’s charter has expanded to non-scientific approaches (Gray & Jones, 2015; Jones and Radaelli, 2015), to science and policy communication, as well as proclaiming normative commitments to both science and democracy. Recently, guideline publications have also been produced that provide detailed instructions about how to conduct NPF research. Along the way several summary pieces have chronicled the NPF’s development. Two of these NPF assessments were part of larger collections of NPF studies, including the 2014 edited volume The Science of Stories and a special NPF symposium issue featured in the Policy Studies Journal. On par with NPF collections emerging every four years, here we offer a third collection of NPF studies that represent some of the best NPF studies to date.Item Narratives and the Policy Process: Applications of the Narrative Policy Framework. Chapter 9: A Narrative Policy Framework Solution to Understanding Climate Change Framing Research(Pressbooks, 2022) Wolters, Erika Allen; Jones, Michael D.The climate change framing literature is vast. So much so that researchers—whether seasoned framing scholars or those foraying into climate change framing research for the first time—can easily be overwhelmed by the sheer volume of studies, the vast array of concepts deployed, the variation in how these same concepts are operationalized, the nuance of a barely numerable assortment of contexts, and the effects all of the aforementioned have on interpreting findings. Here we offer a synthetic review of said literature, focusing on adaptation and mitigation framing studies and findings. In so doing, we first briefly distill the overall developmental arc of climate change framing research. We then provide a conventionally styled thematic overview of the mitigation and adaptation climate change studies. Among other conclusions, we find that while there has been a proliferation of climate change framing research, the findings and the studies themselves are often quite disparate from one another. Moreover, as the literature speaks to itself intermittently and in an ad hoc fashion, it is not readily apparent how climate change framing studies holistically fit together. As a solution to this problem, we offer the Narrative Policy Framework (NPF) as a narrative heuristic to help climate change researchers and communicators organize and understand the literature. We argue that an NPF integration of this inherently unwieldy literature increases the likelihood of research utilization and improves the ability of climate change communicators to inform people about the risks of climate change.Item Narratives and the Policy Process: Applications of the Narrative Policy Framework. Chapter 4: Agreement and Trust: In Narratives or Narrators?(Pressbooks, 2022) Lybecker, Donna L.; McBeth, Mark K.; Sargent, Jessica M.Narratives concerning the working class and their relationship to climate change are important. In particular, how the narrative constructs the relationship and, within this, who communicates a narrative (the narrator) is key. That said, this is a less studied element; the Narrative Policy Framework (NPF) has limited research on narrators. Subsequently, this work examines individuals’ support of narratives and narrators using an Amazon Mechanical Turk (MTurk) survey of 435 participants. After pretesting for climate change views, the subjects chose which narrator they expected to agree with: Mechanic Pat or Organic Farmer Chris. Through randomization, subjects joined either a congruent treatment group (Mechanic Pat tells the anti-climate change narrative and Organic Farmer Chris tells the pro-climate change narrative) or an incongruent treatment group (Mechanic Pat tells the pro-climate change narrative and Organic Farmer Pat tells the anti-climate change narrative). Results indicate that before reading the narratives, climate change “devotees” (those who agree that climate change is occurring and is human-caused) thought they would agree with Organic Farmer Chris over Mechanic Pat. Whereas there was division in the climate change “skeptics” (those who disagree that climate change is real and human-caused) on the question of what narrator they thought they would agree with. Devotees significantly supported the pro-climate change working-class narrative when told by Organic Farmer Chris as compared to when Mechanic Pat told the same narrative. Further showing the power of a narrator, devotees supported the anti-working class climate change narrative more when told by Organic Farmer Chris rather than when Mechanic Pat told the same narrative. Our findings demonstrate that narrators matter and suggest that the NPF needs to consider narrators as a narrative element worthy of further study.Item Understanding Local Adaptation to Prepare Populations for Climate Change(Oxford University Press, 2022-11) Meek, Mariah H; Beever, Erik A; Barbosa, Soraia; Fitzpatrick, Sarah W; Fletcher, Nicholas K; Mittan-Moreau, Cinnamon S; Reid, Brendan N; Campbell-Staton, Shane C; Green, Nancy F; Hellmann, Jessica JAdaptation within species to local environments is widespread in nature. Better understanding this local adaptation is critical to conserving biodiversity. However, conservation practices can rely on species’ trait averages or can broadly assume homogeneity across the range to inform management. Recent methodological advances for studying local adaptation provide the opportunity to fine-tune efforts for managing and conserving species. The implementation of these advances will allow us to better identify populations at greatest risk of decline because of climate change, as well as highlighting possible strategies for improving the likelihood of population persistence amid climate change. In the present article, we review recent advances in the study of local adaptation and highlight ways these tools can be applied in conservation efforts. Cutting-edge tools are available to help better identify and characterize local adaptation. Indeed, increased incorporation of local adaptation in management decisions may help meet the imminent demands of managing species amid a rapidly changing world.