Theses and Dissertations at Montana State University (MSU)
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Item Gichi Bizhiki (Grandfather Buffalo): Anishinaabe sovereignty, the seasonal round, and resistance to the colonization of the web of life, 1780-1890(Montana State University - Bozeman, College of Letters & Science, 2021) Ramaker, Jill Falcon; Chairperson, Graduate Committee: Mary MurphyGichi Bizhiki (Grandfather Buffalo): Anishinaabe Sovereignty, the Seasonal Round, and Resistance to the Colonization of the Web of Life is an Indigenous environmental history of the years 1780 through 1890, in which many Anishinaabeg departed the wild rice- centered food system and fanned out across the Northwestern Plains from the Red River Valley to the Rocky Mountains, as they adapted to buffalo culture. The Anishinaabeg practiced the seasonal round, a highly complex pattern of movements on the land to hunt, harvest, cultivate, and trade foods as part of a holistic way of life, patterned on ancestral reciprocal obligations to place. From the 1600s forward, Euro-American colonizers, in support of industrial and capital development in Europe and eastern North America, extracted natural resources from Turtle Island including animal furs and robes, minerals, forests, and overtook land for monocropping. Euro-American colonization of the web of life to which Anishinaabe people belonged rendered the Anishinaabe seasonal round way of life unsustainable. Further, colonial policies attempted to suppress all aspects of Anishinaabe life including language, knowledge, and spiritual life. In response to colonial persecution, Anishinaabeg 'ran with the archives,' (their ceremonies) as it was unsafe for their children to be identified as Anishinaabeg. Following Anishinaabe western movement, this study tells the story of how Anishinaabe resisted colonization. Research methods included drawing on archival sources from Canada and the United States, and culturally-congruent sources including ceremony, traditional stories, ancestral knowledge of cultural leaders, language, and time spent on the land. This history is presented as one Indigenous view contributing to the field of History. This dissertation concludes that Grandfather Buffalo, the one that has stood for Anishinaabeg and their kin for millennia, is a central source of Anishinaabe sovereignty and the center of the Anishinaabe economy, the kinship network of exchange. Further, the Anishinaabe food system, the seasonal round, was sustainable for millennia because it was critically embedded in the holistic Anishinaabe way of life. Worldview is an essential factor in lifeway sustainability. Finally, by their words, deeds, and movement, Anishinaabeg resisted colonization of the web of life, or what Anishinaabeg refer to as 'all our relations'.Item Geomorphology, biodiversity and ecosystem function, and food web dynamics in large riverscapes(Montana State University - Bozeman, College of Letters & Science, 2021) Scholl, Eric Arthur; Chairperson, Graduate Committee: Wyatt F. Cross; This is a manuscript style paper that includes co-authored chapters.Humans have transformed the Earth's surface so extensively that we now play a dominant role in regulating geomorphological processes around the world. These effects are particularly prevalent in large rivers, which despite their high biophysical complexity, face widespread habitat alteration and simplification. The way species respond to such changes will unquestionably impact the structure and function of ecosystems, with cascading effects on numerous goods and services they provide. Consequently, efforts to understand how the physical habitat template shapes the structure and function of larger river ecosystems are critically needed to predict how future perturbations will impact these imperiled and iconic environments. My dissertation blends approaches from the physical and ecological sciences to uncover connections between the geophysical habitat template, biodiversity and ecosystem function, and the dynamics of food webs in large riverscapes. My questions were: 1) what are the spatial patterns and potential drivers of riverbed habitat, and how do they relate to process domain structures in large rivers? 2) how does the geophysical habitat template influence connections between invertebrate diversity and secondary production? and 3) how are trophic interactions supporting the federally endangered Pallid Sturgeon (Scaphirhynchus albus) shaped by the geophysical habitat template? I found consistent patterns of nested patchiness in riverbed substrate, indicating that multiple factors operating at different scales influence spatial patterns of substrate in the Missouri and Yellowstone Rivers. Invertebrate assemblages were tied to attributes of the geophysical habitat template, with strong relationships between large sediments and diversity. Invertebrate diversity, in turn, was positively related to secondary production, with the most diverse assemblages found in secondary production 'hotspots'. Finally, I found a general relationship between habitat diversity and trophic interaction strengths supporting Pallid Sturgeon, with geophysically diverse areas containing much weaker, and thus potentially stabilizing, interactions than homogenous areas. Additionally, habitat characteristics, such as sediment size, intensified these effects. Together, the chapters of my dissertation broadly highlight the role of nature's stage in governing patterns in biodiversity, secondary production, and trophic interactions across large and dynamic riverscapes, and provide empirical insights for guiding future management and conservation of large rivers in an increasingly simplified world.Item Assessment of the Yellowstone Lake food web during lake trout suppression and Yellowstone cutthroat trout recovery informs conservation benchmarks(Montana State University - Bozeman, College of Letters & Science, 2022) Glassic, Hayley Corrine; Chairperson, Graduate Committee: Christopher S. Guy; This is a manuscript style paper that includes co-authored chapters.The collapse of native Yellowstone cutthroat trout Oncorhynchus clarkii bouvieri (hereafter cutthroat trout) in Yellowstone Lake was caused by predation by invasive lake trout Salvelinus namaycush. As an ecosystem with a low-diversity fish assemblage and several longterm data sets, Yellowstone Lake provided a unique opportunity to evaluate the influence of an invasive salmonid population undergoing suppression beyond only predator-prey dynamics. Diet data for cutthroat trout and lake trout were evaluated at varying densities to determine the effects of density on diet composition and diet plasticity. During the lake trout high-density state, lake trout consumed fewer native cutthroat trout and switched to amphipods, which were also consumed by cutthroat trout, resulting in high diet overlap between the species. As suppression reduced invasive lake trout densities, lake trout returned to consuming cutthroat trout and diet overlap was released. A shift in lake trout delta 13C signatures from the high-density state to the moderate-density state also corroborates higher consumption of cutthroat trout and invasive lake trout diet plasticity. Beyond predator-prey dynamics of lake trout and cutthroat trout, the invasion of lake trout caused > or = 25% change in energy flux for all organisms in Yellowstone Lake except for copepods. Food-web functional state did not change among food webs, but percentage of functional state contributing to total flux did vary. Herbivory was the dominant food-web functional state for all years, with the greatest percentage of flux from herbivory in 2011. In addition, by using a whole-ecosystem model that accounted for whirling disease and historical (natural) lake-level variation, I show that suppression of the lake trout population is necessary for cutthroat trout recovery, but the amount of suppression effort needed for cutthroat trout to reach recovery benchmarks is linked to severity of climate change. Additionally, if climate change increases the frequency and severity of reduced lake levels in the future, cutthroat trout recovery benchmarks may need to be adapted. With this research, I demonstrate how the feedbacks among predator-prey dynamics, disease, and climate change can complicate the suppression of invasive species and the conservation of invaded ecosystems and must be considered for establishing realistic conservation benchmarks.Item The effects of temperature on stream ecosystem structure, secondary production, and food web dynamics(Montana State University - Bozeman, College of Letters & Science, 2019) Junker, James Robert; Chairperson, Graduate Committee: Wyatt F. Cross; Wyatt F. Cross, Jonathan P. Benstead, Alexander D. Huryn, James M. Hood, Daniel Nelson, Gísli M. Gíslason and Jón Ólafsson were co-authors of the article, 'Patterns and drivers of ecosystem-level biomass and stoichiometry in streams' submitted to the journal 'Ecosystems' which is contained within this thesis.; Wyatt F. Cross, Jonathan P. Benstead, Alexander D. Huryn, James M. Hood, Daniel Nelson, Gísli M. Gíslason and Jón Ólafsson were co-authors of the article, 'Resources govern the temperature-dependence of animal production at multiple timescales' submitted to the journal 'Ecology letters' which is contained within this thesis.; Wyatt F. Cross, Jonathan P. Benstead, Alexander D. Huryn, James M. Hood, Daniel Nelson, Gísli M. Gíslason and Jón Ólafsson were co-authors of the article, 'Responses of food web organic matter fluxes to temperature and their implications for food web stability' which is contained within this thesis.Since 1880, Earth's mean temperature has risen ~0.85 °C, and increases >1.5 °C are likely by the end of the 21st century. Warming temperatures will continue to shuffle and restructure ecological communities and the consequences of these changes for ecosystem processes and services are largely unknown because of the difficulties in measurement and understanding in complex ecological systems. Yet, isolating temperature's influence is crucial to predicting how ecosystems will look and operate in a 'no-analog' future and to begin to integrate warming with the myriad other stressors affecting natural systems. In this dissertation, I leverage a natural stream temperature gradient (~5 - 25 °C) within a geothermal watershed to investigate the effects of temperature on stream ecosystems--with three specific questions: 1) what is the relative influence of temperature and stream flow on whole-ecosystem biomass and element storage? 2) how does temperature shape patterns of animal production across and within streams? and 3) how does temperature modify the seasonal patterns of consumer-resource interactions in stream food webs? I found stream flow to have primacy in driving the 2 orders of magnitude variation in ecosystem biomass and element storage--mediated through flow's effect on plant body size. At higher trophic levels, temperature strongly shaped the patterns of secondary production coinciding with a 45-fold increase in annual secondary production across streams. This positive relationship was mediated through covariation between temperature and basal resource availability, both across and within streams. Consumer interactions with basal resources showed differing seasonality with increasing temperature. At higher temperatures, consumer demand and resource availability were strongly coupled seasonally compared to cooler streams. Tighter coupling between consumers and resources with temperature lead to more consistent, if higher, interaction strengths through the year. My work shows temperature as an important structuring driver of ecosystem structure and process, however, a common thread through each chapter shows the influence of temperature is mediated through its interactions with other ecosystem drivers. Ultimately, as the covariation between temperature and other environmental drivers (e.g., disturbance, nutrient and light availability, etc.) shift globally, recognizing these interactions is increasingly important.Item Feeding ecology and food-web interactions of the fish assemblage in the upper Missouri River and lower Yellowstone River with an emphasis on pallid sturgeon conservation(Montana State University - Bozeman, College of Letters & Science, 2018) Dutton, Adeline Jean; Chairperson, Graduate Committee: Christopher S. Guy; Christopher S. Guy was a co-author of the article, 'Diet overlap and gape size of pallid sturgeon and shovelnose sturgeon in the Missouri River and Yellowstone River' submitted to the journal 'Journal of applied ichthyology' which is contained within this thesis.; Christopher S. Guy and Eric A. Scholl were co-authors of the article, 'Quantitative food-web linkages among primary, secondary, and tertiary consumers in the upper Missouri River and lower Yellowstone River' submitted to the journal 'Journal of freshwater ecology' which is contained within this thesis.A conservation propagation program started in the late 1990s for the endangered Pallid Sturgeon Scaphirhynchus albus because the species was not recruiting in the Missouri River. Stocking has been successful and several studies have suggested that the survival of stocked Pallid Sturgeon in the upper Missouri River is relatively high. Stocking of hatchery-origin Pallid Sturgeon may have created an uncharacteristic population structure, which could lead to intraspecific and interspecific competition between juvenile Pallid Sturgeon, Shovelnose Sturgeon, and other fish species in the Missouri and Yellowstone rivers. The purpose of this study was to describe the diets of Pallid Sturgeon and Shovelnose Sturgeon, determine if gape size differed between species, and assess diets of many secondary and tertiary consumers to describe the food web of the upper Missouri and lower Yellowstone rivers. Pianka's index of diet overlap was highest in segments near Fort Peck Dam in the Missouri River. Diet overlap was low in the Missouri River below the confluence with the Yellowstone River and in the Yellowstone River. Gape size was slightly different between Pallid Sturgeon and Shovelnose Sturgeon suggesting it was not the mechanism for the shift to piscivory in Pallid Sturgeon. Chironomidae were the most abundant primary consumer in the upper Missouri River and lower Yellowstone River. Hydropsychidae were not abundant in either river system, but were frequently consumed by Goldeye, Channel Catfish, Shovelnose Sturgeon, and Stonecat in the Missouri River and Shovelnose Sturgeon in the Yellowstone River. Emerald Shiner were the most abundant secondary consumer in both rivers and the most frequently consumed secondary consumer by Pallid Sturgeon, in the Missouri River. In addition, Pallid Sturgeon in the Missouri River consumed Channel Catfish, Shovelnose Sturgeon, and either Sicklefin Chub or Sturgeon Chub. In the Yellowstone River, Pallid Sturgeon consumed Channel Catfish, Scaphirhynchus spp., and Stonecat. These results provide a foundation into key linkages among predators and prey to better understand the effects of stocking Pallid Sturgeon in the upper Missouri River and lower Yellowstone River.Item Indirect effects of herbicides on an agroecological trophic system(Montana State University - Bozeman, College of Agriculture, 2001) Taylor, Rebecca Lynn