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Articles 9331 - 9360 of 17827
Full-Text Articles in Entire DC Network
Terrestrial Ecological Risk Analysis Via Dietary Exposure At Uranium Mine Sites In The Grand Canyon Watershed (Arizona, Usa), Jo Ellen Hinck, Danielle Cleveland, Bradley E. Sample
Terrestrial Ecological Risk Analysis Via Dietary Exposure At Uranium Mine Sites In The Grand Canyon Watershed (Arizona, Usa), Jo Ellen Hinck, Danielle Cleveland, Bradley E. Sample
United States Geological Survey: Staff Publications
The U.S. Department of the Interior recently included uranium (U) on a list of mineral commodities that are considered critical to economic and national security. The uses of U for commercial and residential energy production, defense applications, medical device technologies, and energy generation for space vehicles and satellites are known, but the environmental impacts of uranium extraction are not always well quantified. We conducted a screening-level ecological risk analysis based on exposure to miningrelated elements via diets and incidental soil ingestion for terrestrial biota to provide context to chemical characterization and exposures at breccia pipe U mines in northern Arizona. …
Managing For Radical Ecosystem Change: Applying The Resist-Accept- Direct (Rad) Framework, Abigail J. Lynch, Laura M. Thompson, Erik A. Beever, David N. Cole, Augustin C. Engman, Cat Hawkins Hoffman, Stephen T. Jackson, Trevor J. Krabbenhoft, David J. Lawrence, Douglas Limpinsel, Robert T. Magill, Tracy A. Melvin, John M. Morton, Robert A. Newman, Jay O. Peterson, Mark T. Porath, Frank J. Rahel, Gregor W. Schuurman, Suresh A. Sethi, Jennifer L. Wilkening
Managing For Radical Ecosystem Change: Applying The Resist-Accept- Direct (Rad) Framework, Abigail J. Lynch, Laura M. Thompson, Erik A. Beever, David N. Cole, Augustin C. Engman, Cat Hawkins Hoffman, Stephen T. Jackson, Trevor J. Krabbenhoft, David J. Lawrence, Douglas Limpinsel, Robert T. Magill, Tracy A. Melvin, John M. Morton, Robert A. Newman, Jay O. Peterson, Mark T. Porath, Frank J. Rahel, Gregor W. Schuurman, Suresh A. Sethi, Jennifer L. Wilkening
United States Geological Survey: Staff Publications
Ecosystem transformation involves the emergence of persistent ecological or social–ecological systems that diverge, dramatically and irreversibly, from prior ecosystem structure and function. Such transformations are occurring at increasing rates across the planet in response to changes in climate, land use, and other factors. Consequently, a dynamic view of ecosystem processes that accommodates rapid, irreversible change will be critical for effectively conserving fish, wildlife, and other natural resources, and maintaining ecosystem services. However, managing ecosystems toward states with novel structure and function is an inherently unpredictable and difficult task. Managers navigating ecosystem transformation can benefit from considering broader objectives, beyond a …
Influence Of Irrigation Drivers Using Boosted Regression Trees: Kansas High Plains, Susan E. Lamb, Erin M.K. Haacker, Samuel J. Smidt
Influence Of Irrigation Drivers Using Boosted Regression Trees: Kansas High Plains, Susan E. Lamb, Erin M.K. Haacker, Samuel J. Smidt
Department of Earth and Atmospheric Sciences: Faculty Publications
Groundwater levels across parts of western Kansas have been declining at unsustainable rates due to pumping for agricultural irrigation despite water-saving efforts. Accelerating this decline is the complex agricultural landscape, consisting of both categorical (e.g., management boundaries) and numerical (e.g., crop prices) factors that drive irrigation decisions, making integrated water budget management a challenge. Furthermore, these factors frequently change through time, rendering management strategies outdated within relatively short time scales. This study uses boosted regression trees to simultaneously analyze categorical and numerical data against annual irrigation pumping to determine the relative influence of each factor on groundwater pumping across both …
How Wetland Plants Deal With Stress, Taylor M. Sloey
How Wetland Plants Deal With Stress, Taylor M. Sloey
Biological Sciences Faculty Publications
We all get stressed. To deal with that stress, some of us may exercise, take a bubble bath, cry, or simply leave the stressful situation. But how can you cope with stress if you are rooted in place? Plants that live in estuaries are exposed to many types of stresses from the environment, including flooding, high salt levels, low soil oxygen, and waves. Fortunately, wetland plants have developed ways to survive within these conditions, from excreting salt, to growing faster, to even breaking down cell walls to maximize air flow. Plants can tolerate different levels of stress depending on their …
Salt Marsh Hydrogeology: A Review, Julia Guimond, Joseph Tamborski
Salt Marsh Hydrogeology: A Review, Julia Guimond, Joseph Tamborski
OES Faculty Publications
Groundwater–surface water exchange in salt marsh ecosystems mediates nearshore salt, nutrient, and carbon budgets with implications for biological productivity and global climate. Despite their importance, a synthesis of salt marsh groundwater studies is lacking. In this review, we summarize drivers mediating salt marsh hydrogeology, review field and modeling techniques, and discuss patterns of exchange. New data from a Delaware seepage meter study are reported which highlight small-scale spatial variability in exchange rates. A synthesis of the salt marsh hydrogeology literature reveals a positive relationship between tidal range and submarine groundwater discharge but not porewater exchange, highlighting the multidimensional drivers of …
Taxonomic And Nutrient Controls On Phytoplankton Iron Quotas In The Ocean, Benjamin S. Twining, Olga Antipova, P. Dreux Chappell, Natalie R. Cohen, Jeremy E. Jacquot, Elizabeth L. Mann, Adrian Marchetti, Daniel C. Ohnemus, Sara Rauschenberg, Alessandro Tagliabue
Taxonomic And Nutrient Controls On Phytoplankton Iron Quotas In The Ocean, Benjamin S. Twining, Olga Antipova, P. Dreux Chappell, Natalie R. Cohen, Jeremy E. Jacquot, Elizabeth L. Mann, Adrian Marchetti, Daniel C. Ohnemus, Sara Rauschenberg, Alessandro Tagliabue
OES Faculty Publications
Phytoplankton iron contents (i.e., quotas) directly link biogeochemical cycles of iron and carbon and drive patterns of nutrient limitation, recycling, and export. Ocean biogeochemical models typically assume that iron quotas are either static or controlled by dissolved iron availability. We measured iron quotas in phytoplankton communities across nutrient gradients in the Pacific Ocean and found that quotas diverged significantly in taxon‐specific ways from laboratory‐derived predictions. Iron quotas varied 40‐fold across nutrient gradients, and nitrogen‐limitation allowed diatoms to accumulate fivefold more iron than co‐occurring flagellates even under low iron availability. Modeling indicates such “luxury” uptake is common in large regions of …
Microbially Induced Sedimentary Structures In Clastic Deposits: Implication For The Prospection For Fossil Life On Mars, Nora Noffke
OES Faculty Publications
Abundant and well-preserved fossil microbenthos occurs in siliciclastic deposits of all Earth ages, from the early Archean to today. Studies in modern settings show how microbenthos responds to sediment dynamics by baffling and trapping, binding, biostabilization, and growth. Results of this microbial-sediment interaction are microbially induced sedimentary structures (MISS). Successful prospection for rich MISS occurrences in the terrestrial lithological record requires unraveling genesis and taphonomy of MISS, both of which are defined only by a narrow range of specific conditions. These conditions have to coincide with high detectability which is a function of outcrop quality, bedding character, and rock type. …
Detrital Neodymium And (Radio)Carbon As Complementary Sedimentary Bedfellows? The Western Arctic Ocean As A Testbed, Melissa S. Schwab, Jörg D. Rickli, Robie W. Macdonald, H. Rodger Harvey, Negar Haghipour, Timothy I. Eglinton
Detrital Neodymium And (Radio)Carbon As Complementary Sedimentary Bedfellows? The Western Arctic Ocean As A Testbed, Melissa S. Schwab, Jörg D. Rickli, Robie W. Macdonald, H. Rodger Harvey, Negar Haghipour, Timothy I. Eglinton
OES Faculty Publications
Interactions between organic and detrital mineral phases strongly influence both the dispersal and accumulation of terrestrial organic carbon (OC) in continental margin sediments. Yet the complex interplay among biological, chemical, and physical processes limits our understanding of how organo-mineral interactions evolve during sediment transfer and burial. In particular, diverse OC sources and complex hydrodynamic processes hinder the assessment of how the partnership of organic matter and its mineral host evolves during supply and dispersal over continental margins. In this study, we integrate new and compiled sedimentological (grain size, surface area), organic (%OC, OC-δ13C, OC-F14C), and inorganic …
Seasonal Dispersal Of Fjord Meltwaters As An Important Source Of Iron And Manganese To Coastal Antarctic Phytoplankton, Kiefer O. Forsch, Lisa Hahn-Woernle, Robert M. Sherrell, Vincent J. Roccanova, Kaixuan Bu, David Burdige, Maria Vernet, Katherine A. Barbeau
Seasonal Dispersal Of Fjord Meltwaters As An Important Source Of Iron And Manganese To Coastal Antarctic Phytoplankton, Kiefer O. Forsch, Lisa Hahn-Woernle, Robert M. Sherrell, Vincent J. Roccanova, Kaixuan Bu, David Burdige, Maria Vernet, Katherine A. Barbeau
OES Faculty Publications
Glacial meltwater from the western Antarctic Ice Sheet is hypothesized to be an important source of cryospheric iron, fertilizing the Southern Ocean, yet its trace-metal composition and factors that control its dispersal remain poorly constrained. Here we characterize meltwater iron sources in a heavily glaciated western Antarctic Peninsula (WAP) fjord. Using dissolved and particulate ratios of manganese to iron in meltwaters, porewaters, and seawater, we show that surface glacial melt and subglacial plumes contribute to the seasonal cycle of iron and manganese within a fjord still relatively unaffected by climate-change-induced glacial retreat. Organic ligands derived from the phytoplankton bloom and …
Bioactive Trace Metals And Their Isotopes As Paleoproductivity Proxies: An Assessment Using Geotraces-Era Data, T. J. Horner, S. H. Little, T. W. Conway, J. R. Farmer, Jennifer E. Hertzberg, D. J. Janssen, A.J.M. Lough, J.L. Mckay, A. Tessin, S.J.G. Galer, S. L. Jaccard, F. Lacan, A. Paytan, K. Wuttig, Geotraces-Pages Biological Productivity Working Group Members
Bioactive Trace Metals And Their Isotopes As Paleoproductivity Proxies: An Assessment Using Geotraces-Era Data, T. J. Horner, S. H. Little, T. W. Conway, J. R. Farmer, Jennifer E. Hertzberg, D. J. Janssen, A.J.M. Lough, J.L. Mckay, A. Tessin, S.J.G. Galer, S. L. Jaccard, F. Lacan, A. Paytan, K. Wuttig, Geotraces-Pages Biological Productivity Working Group Members
OES Faculty Publications
Phytoplankton productivity and export sequester climatically significant quantities of atmospheric carbon dioxide as particulate organic carbon through a suite of processes termed the biological pump. Constraining how the biological pump operated in the past is important for understanding past atmospheric carbon dioxide concentrations and Earth's climate history. However, reconstructing the history of the biological pump requires proxies. Due to their intimate association with biological processes, several bioactive trace metals and their isotopes are potential proxies for past phytoplankton productivity, including iron, zinc, copper, cadmium, molybdenum, barium, nickel, chromium, and silver. Here, we review the oceanic distributions, driving processes, and depositional …
Modeling Stromatolite Formation With Diffusion-Limited Aggregation, Laura E. Stevens
Modeling Stromatolite Formation With Diffusion-Limited Aggregation, Laura E. Stevens
Graduate Student Theses, Dissertations, & Professional Papers
Stromatolites, microbialites, and other microbially induced sedimentary structures exist in the rock record as far back as 3.6 billion years ago and continue to form in the present day. Better characterizing these structures and better understanding how they form is crucial in distinguishing these biosignatures from similar, abiotic structures, which can help us to understand the conditions of early Earth and early Mars. To that end, I have modified DLA 3D EXT, an open-source stromatolite modeling program, to more closely reflect the process of microbial trapping-and-binding by filamentous microbes in a calcite-precipitating hot spring system. This modified program includes a …
Nitrogen Dynamics And Transport Along Flowpaths In A Rural Wetland-Stream Complex, Colton Kyro
Nitrogen Dynamics And Transport Along Flowpaths In A Rural Wetland-Stream Complex, Colton Kyro
Graduate Student Theses, Dissertations, & Professional Papers
Human activities have doubled the rate of nitrogen inputs onto the landscape resulting in elevated nitrogen concentrations in our streams. Anthropogenically applied nitrogen is largely transported to stream networks via groundwater movement. Groundwater discharge occurs in distinct points along a stream but whose influences can often persist far beyond that area due to insufficient biogeochemical removal of imported nitrogen potentially causing alterations in community structure and precipitating large algae blooms. To understand the factors governing nitrogen abundance in a historical polluted stream, I used a mass-balance approach to quantify groundwater-surface water interaction and the magnitude of groundwater nitrogen input and …
Influence Of Iceberg-Discharge Events On The Climate And Circulation Of The Central North Atlantic Ocean During The Last Glaciation, Ava Mcilvaine
Influence Of Iceberg-Discharge Events On The Climate And Circulation Of The Central North Atlantic Ocean During The Last Glaciation, Ava Mcilvaine
Scripps Senior Theses
The repeated occurrence of episodic iceberg-discharge events and abrupt climate change in the North Atlantic Ocean is well-documented for the late Quaternary period. However, much of the evidence for these periods known as Heinrich Events comes from the subpolar region, where deposition can be dominated by ice-rafted debris (IRD) and overwhelm other oceanographic and climatic indicators. Thus, the following analysis of coarse sediment from Integrated Ocean Drilling Program (IODP) Core Site U1313 (41°0.0'N, 32°57.42'W) evaluated ocean cooling related to ice-rafting, water mass migration, and climate change over the approximate last 100,000 years. Site U1313 is located near the North Atlantic …
Strategic Trampling To Conserve Soil Moisture In A Namibian Rangeland, I. Zimmermann, J. Labuschagne, V. K. Namupala
Strategic Trampling To Conserve Soil Moisture In A Namibian Rangeland, I. Zimmermann, J. Labuschagne, V. K. Namupala
IGC Proceedings (1977-2023)
No abstract provided.
Lactation Performance Of Murrah‐Improved Dairy Buffalo Grazing On Improved Pasture, G. R. Yang, A. K. Wang, J. C. Zhang, M. F. Fu, B. Z. Huang, X. P. Yuan, S. P. Yang
Lactation Performance Of Murrah‐Improved Dairy Buffalo Grazing On Improved Pasture, G. R. Yang, A. K. Wang, J. C. Zhang, M. F. Fu, B. Z. Huang, X. P. Yuan, S. P. Yang
IGC Proceedings (1977-2023)
No abstract provided.
Prediction Of Methane Emission Of Dairy Cows Offered Fresh Grass At Maintenance Level, Tianhai Yan, C. S. Mayne
Prediction Of Methane Emission Of Dairy Cows Offered Fresh Grass At Maintenance Level, Tianhai Yan, C. S. Mayne
IGC Proceedings (1977-2023)
No abstract provided.
Fattening Sheep In A Warm Shed To Compensate For Energy Deficiency In Winter In North‐West China, Jianping Wu, Zhe Liu, Lian Yang, David L. Michalk, Liping Zhang, Randall Jones, Zhaomin Lei
Fattening Sheep In A Warm Shed To Compensate For Energy Deficiency In Winter In North‐West China, Jianping Wu, Zhe Liu, Lian Yang, David L. Michalk, Liping Zhang, Randall Jones, Zhaomin Lei
IGC Proceedings (1977-2023)
No abstract provided.
Characterizing Reactive Iron Mineral Coatings And Their Roles In Natural Attenuation At A Site With Historical Contamination, Han Hua
Dissertations
Reactive iron mineral coatings in redox transition zones play an important role in contaminant attenuation. These mineral coatings include poorly crystalline to crystalline iron sulfides, carbonates, and oxyhydroxides, and are a signature of the biogeochemical processes occurring. To better understand these processes, reactive iron mineral coatings are characterized in an 18-m Anaerobic Core collected from a contaminated industrial site. This study targets redox transition zones uncovered in the core. A suite of complementary analyses is applied to distinguish the surface coating mineralogy using X-ray Diffraction, X-ray fluorescence, and field-emission scanning electron microscopy (FESEM) with energy dispersive X-ray analyzer (EDX). In …
Evolution Of Island, Dominique Kongsli
Evolution Of Island, Dominique Kongsli
The Transdisciplinary STEAM+ Journal
Evolution of Island emerged from the depths of an ocean of blue paint. My process involves observation of nature: I remember scuba diving in Thailand in the Andaman Sea and having a spiritual experience underwater while observing Christmas-tree worms pop in and out of the coral.
Response Of Arid Grassland Community Standing Crop To Banning Grazing And Deferral Grazing Management, Zhijun Wei, Ruirui Yan, Hongmei Liu, Xiangjun Yun
Response Of Arid Grassland Community Standing Crop To Banning Grazing And Deferral Grazing Management, Zhijun Wei, Ruirui Yan, Hongmei Liu, Xiangjun Yun
IGC Proceedings (1977-2023)
No abstract provided.
The Effect Of Climate Change On Livestock Carrying Capacity Of Inner Mongolia, Yurong Wei, Ruiqing Guo, Xuebiao Pan, Buju Long
The Effect Of Climate Change On Livestock Carrying Capacity Of Inner Mongolia, Yurong Wei, Ruiqing Guo, Xuebiao Pan, Buju Long
IGC Proceedings (1977-2023)
No abstract provided.
Relationships Of Milk Production Of Beef Cows To Postweaning Gain Of Their Calves, X. Z. Wang, Michael A. Brown, F. Q. Gao, J. P. Wu
Relationships Of Milk Production Of Beef Cows To Postweaning Gain Of Their Calves, X. Z. Wang, Michael A. Brown, F. Q. Gao, J. P. Wu
IGC Proceedings (1977-2023)
No abstract provided.
The Rangeland Resource Status And Its Variability In Zoige, Qinghai‐Tibetan Plateau, Qian Wang, Ning Wu, Peng Luo
The Rangeland Resource Status And Its Variability In Zoige, Qinghai‐Tibetan Plateau, Qian Wang, Ning Wu, Peng Luo
IGC Proceedings (1977-2023)
No abstract provided.
The Change Of Soil Temperature To Stocking Rate On The Stipa Breviflora Desert Steppe, Jian'an Wang, Guodong Han, Yajuan Jia
The Change Of Soil Temperature To Stocking Rate On The Stipa Breviflora Desert Steppe, Jian'an Wang, Guodong Han, Yajuan Jia
IGC Proceedings (1977-2023)
No abstract provided.
Rotational And Continuous Grazing Of Sheep In The Inner Mongolian Steppe Of China, C. J. Wang, B. M. Tas, T. Glindemann, K. Mueller, Anna Schiborra, P. Schoenbach, M. Gierus, Friedhelm Taube, A. Susenbeth
Rotational And Continuous Grazing Of Sheep In The Inner Mongolian Steppe Of China, C. J. Wang, B. M. Tas, T. Glindemann, K. Mueller, Anna Schiborra, P. Schoenbach, M. Gierus, Friedhelm Taube, A. Susenbeth
IGC Proceedings (1977-2023)
No abstract provided.
Rotational Grazing Effects Of Dairy Cows On Yield And Consumption In Dwarf Napiergrass At A Paddock Scale For 3 Years From The Establishment In Southern Kyushu, Japan, A. Wadi, Yasuyuki Ishii, H. Hasyim, R. F. Utamy, Sachiko Idota, Kiichi Fukuyama
Rotational Grazing Effects Of Dairy Cows On Yield And Consumption In Dwarf Napiergrass At A Paddock Scale For 3 Years From The Establishment In Southern Kyushu, Japan, A. Wadi, Yasuyuki Ishii, H. Hasyim, R. F. Utamy, Sachiko Idota, Kiichi Fukuyama
IGC Proceedings (1977-2023)
No abstract provided.
Prediction Of Diet Quality In Mongolian Livestock With Portable Near Infrared Spectroscopy Offeces, G. Tolleson, G. Udval, S. Prince, K. Banik
Prediction Of Diet Quality In Mongolian Livestock With Portable Near Infrared Spectroscopy Offeces, G. Tolleson, G. Udval, S. Prince, K. Banik
IGC Proceedings (1977-2023)
No abstract provided.
Evaluating Alternative Livestock Production Systems Sustainability And Farmer Income In Taipusi Banner, Inner Mongolia, Q. Tian, R. Jones, David L. Michalk, Geoff D. Millar, David R. Kemp, Z. Xu, J. Xie, Y. Zheng
Evaluating Alternative Livestock Production Systems Sustainability And Farmer Income In Taipusi Banner, Inner Mongolia, Q. Tian, R. Jones, David L. Michalk, Geoff D. Millar, David R. Kemp, Z. Xu, J. Xie, Y. Zheng
IGC Proceedings (1977-2023)
No abstract provided.
Effect Of Feed Restriction On Compensatory Growth And Body Dimensions In Ujumuqin Lambs, Jiayin Song, Daowei Zhou, Ping Wang
Effect Of Feed Restriction On Compensatory Growth And Body Dimensions In Ujumuqin Lambs, Jiayin Song, Daowei Zhou, Ping Wang
IGC Proceedings (1977-2023)
No abstract provided.
The Weight Variations Of Grazing Goats And Sheep In The Desert Steppe In Winter And Spring, Y. M. Shan, Mingjiu Wang, H. J. Chen, Zh. Y. Wu, Zh. Q. Li, X. L. Sun, Zh. Yang
The Weight Variations Of Grazing Goats And Sheep In The Desert Steppe In Winter And Spring, Y. M. Shan, Mingjiu Wang, H. J. Chen, Zh. Y. Wu, Zh. Q. Li, X. L. Sun, Zh. Yang
IGC Proceedings (1977-2023)
No abstract provided.