Digital Commons Network^™

Partnerships For Developing Regional Native Seed Sources For Use In Restoration, Berta Youtie

IGC Proceedings (1977-2023)

No abstract provided.

Verification Of Germplasm Source And Status By Seed Certifying Agencies As Native Plants Are Collected And Cultivated, Stanford A. Young

IGC Proceedings (1977-2023)

No abstract provided.

Genetic Diversity Of Elymus Sibiricus L. In The Eastern Qinghai‐Tibet Plateau Of China Detected By Srap Markers, Jiajun Yan, Shiqie Bai, Xiao Ma, Xinquan Zhang, Changbing Zhang, Minghong You

IGC Proceedings (1977-2023)

No abstract provided.

Comparison Of Productivity Among Alfalfa Varieties With Different Fall Dormancy, Chengzhang Wang, Xuebing Yan, Yuxia Guo, Yongge Gao, Yanhua Wang

IGC Proceedings (1977-2023)

No abstract provided.

Antioxidant Activity, Vitamin Profiles And Polyphenol Contents Of Pasture Grasses And Legumes, Herbs And Wild Plants For Improved Animal Products, Y. Tamura, H. Sano, T. Masumizu, K. Yamaki, M. Al‐Mamun

IGC Proceedings (1977-2023)

No abstract provided.

Forage Potential Of Legumes Native To Sub‐Tropical Southeastern Usa, Kenneth H. Quesenberry, J. M. Dampier, E. Valencia

IGC Proceedings (1977-2023)

No abstract provided.

Adaptability Of Cleistogenes Songorica To Drought Stress, Tao Qu, Zhibiao Nan

IGC Proceedings (1977-2023)

No abstract provided.

Conservation, Distribution, And Utilization Of Pasture And Rangeland Plant Genetic Resources, Gary A. Pederson, Melanie Harrison-Dunn, J. Brad Morris

IGC Proceedings (1977-2023)

No abstract provided.

Morphological Variation Among Alfalfa Cultivars With Different Cold Hardiness, Xiangping Liu, Mutsuyasu Ito, Guowen Cui, Tsuyoshi Okajima

IGC Proceedings (1977-2023)

No abstract provided.

Review And Prospect Of Forage Germplasm Resource Protection In China, Xiaofang Li

IGC Proceedings (1977-2023)

No abstract provided.

Study On Determinate And Indeterminate Growth Habit Of Alfalfa, Jinhua Li, Xinshi Lu, Jishan Chen

IGC Proceedings (1977-2023)

No abstract provided.

Renovation Of Annual Grassland In Japan By Volunteer Grasses, Kentarou Ikeda, Keisuke Hayashi, Takafumi Gotoh, Masataka Shimojo, Yasuhisa Masuda

IGC Proceedings (1977-2023)

No abstract provided.

Growth Response Of Alfalfa Cultivars And Change In Soil Nutrient Availability By Lime Application In Acid Soils, Yanjun Guo, Jianguo Huang, Jianguo Han

IGC Proceedings (1977-2023)

No abstract provided.

Genetic Relationships Among Domestic And Introduced Varieties Of Alfalfa, L. Q. Chen, S. L. Shi, X. T. Zhang

IGC Proceedings (1977-2023)

No abstract provided.

Different Scales Of Adaptive Diversity In Austrodanthonia — A Case Against Domestication, Cathy M. Waters, Gavin J. Melville, Ronald B. Hacker

IGC Proceedings (1977-2023)

No abstract provided.

Domestication Of Native Plant Species For Seed Production And Planting In Arctic And Sub‐Arctic Alaska, S. J. Wright

IGC Proceedings (1977-2023)

No abstract provided.

Alexandrium In The Arctic: Are Harmful Algae Spreading As The Arctic Warms?, Sveinn Einarsson, Kate Lowry, Robert Pickart, Karin Ashjian, P. Dreux Chappell

College of Sciences Posters

Alexandrium tamerense is a well-studied dinoflagellate known for its ability to produce the neurotoxin that causes paralytic shellfish poisoning. Until 1970 Alexandrium tamerense was only found in Europe, North America, and Japan but has been increasingly found all over the globe. Alexandrium is characteristically found in temperate and subtropical regions and as the Arctic warms, there is considerable concern that it may be expanding into the Arctic. We found Alexandrium tamerense during a research expedition to the Alaskan Beaufort Sea shelf to study upwelling. Upwelling events are known to support seasonal blooms of phytoplankton, which are important primary producers at …

Seasonal Variability In Diazotroph Abundance And Gene Expression At A Coastal N2 Fixation Hotspot (Outer Banks, Nc), Katherine Crider, Corday Selden, Kimberly Powell, P. Dreux Chappell

College of Sciences Posters

Marine microbial dinitrogen (N₂) fixation, the conversion of gaseous N₂ to bioavailable species, is the primary source of new oceanic nitrogen (N). N is present in nucleic acids, amino acids, and proteins, and is essential to all life. Long considered to be a primarily oligotrophic ocean process, significant N₂ fixation rates have recently been observed in coastal environments, including along the Cape Hatteras front. To see if elevated N₂ fixation was a persistent feature in this region, N₂ fixation rates and N₂ fixer (diazotroph) abundance and gene expression were investigated through roughly monthly …

Defining The Environmental Niche Of The Two Main Clades Of Trichodesmium: A Study On The West Florida Shelf, Kristina Confesor, Corday Selden, Kimberly Powell, Angela Knapp, Kristen Buck, Laura Donahue, Dreux Chappell

College of Sciences Posters

Dinitrogen (N₂) fixation is the process of taking widely abundant but mostly biologically inaccessible N₂ gas and converting it into more biologically accessible forms of the essential macronutrient nitrogen. Only a small fraction of organisms known as diazotrophs can perform biological N₂ fixation. Trichodesmium is one such genus of N₂-fixing marine cyanobacteria that is commonly observed in waters along the West Florida Shelf (WFS). We hypothesize that the two main Trichodesmium clades (T. erythraeum and T. thiebautii) occupy distinct environmental niches, one being more coastal and one being more oceanic. To test …

A Foray Into Laboratory Scale Soil Incubations With Corn Stover And High Lignin Fermentation Byproduct, Michelle Wang

ENGS 88 Honors Thesis (AB Students)

As the production of biofuels increases to meet the demands of a growing low carbon economy, questions of sustainability surrounding its feedstock and waste streams have become increasingly relevant. In the biofuel production process, crop residues like corn stover are harvested from the field and converted to biofuels leaving generating a residue called high lignin fermentation byproduct (HLFB). From extensive process modelling in the literature, it is suggested that HLFB should be either combusted to fuel auxiliary conversion processes or returned to the soil in place of the crop residues that were harvested. Currently, there is little literature testing the …

College Of Natural Sciences Newsletter, April 2021, College Of Natural Sciences

College of Natural Sciences Newsletters and Reports

Volume 2, Issue 4

Page 1 Dean's Message
Page 2 & 3 Awards & Recognition
Page 4 Student Spotlight: Allsion Bjornstad
Page 5 Research Spotlight: Dr. Vondruska & Students
Page 6 Department Head Interviews
Page 7 Media Coverage of CNS
Page 8 Open PRAIRIE Data
Page 9 Student Club Spotlight: BMGSA
Page 10 Then & Now: Urban Geography

Synchronous Marine And Terrestrial Carbon Cycle Perturbation In The High Arctic During The Petm, Ying Cui, Aaron F. Diefendorf, Lee R. Kump, Shijun Jiang, Katherine H. Freeman

Department of Earth and Environmental Studies Faculty Scholarship and Creative Works

The Paleocene-Eocene Thermal Maximum (PETM; 56 Ma) is considered to be one of the best analogs for future climate change. The carbon isotope composition (δ¹³C) of n-alkanes derived from leaf waxes of terrestrial plants and marine algae can provide important insights into the carbon cycle perturbation during the PETM. Here, we present new organic geochemical data and compound-specific δ¹³C data from sediments recovered from an early Cenozoic basin-margin succession from Spitsbergen. These samples represent one of the most expanded PETM sites and provide new insights into the high Arctic response to the PETM. Our results reveal …

The Miocene: The Future Of The Past, M. J. Kohn

Geosciences Faculty Publications and Presentations

The Miocene epoch (23.03–5.33 Ma) was a time interval of global warmth, relative to today. Continental configurations and mountain topography transitioned toward modern conditions, and many flora and fauna evolved into the same taxa that exist today. Miocene climate was dynamic: long periods of early and late glaciation bracketed a ∼2 Myr greenhouse interval—the Miocene Climatic Optimum (MCO). Floras, faunas, ice sheets, precipitation, pCO₂, and ocean and atmospheric circulation mostly (but not ubiquitously) covaried with these large changes in climate. With higher temperatures and moderately higher pCO₂ (∼400–600 ppm), the MCO has been suggested as …

Characterization Of Uranium, Lead, And Rare Earth Element Pollution In Natural Soils And Sediments, Hope Rasmussen

Civil and Environmental Engineering Theses and Dissertations

Heavy metals in the environment add to the global burden of pollution, negatively impacting public health and ecosystem resilience. This study included projects regarding uranium (U), lead (Pb), and rare earth elements (REE) in natural samples, due to their known toxicity, ubiquity, and relevance in context to recent pollution trends. The first project focused on testing the potential of using a hydroxyapatite product as a remediation solution for U-contaminated groundwater and soil at an EPA Superfund site. The results showed that the U was sequestered in a highly crystalline mineral form within the solids, guiding the EPA to specify the …

Restoration Agriculture In Louisiana: On The Prospects And Ethics Of Creating A Permanent, Dynamic Agricultural System Suited For Louisiana's Environment, Noah Willsea

Honors Capstones

No abstract provided.

The Salas Y Gómez And Nazca Ridges: A Review Of The Importance, Opportunities And Challenges For Protecting A Global Diversity Hotspot On The High Seas, Daniel Wagner, Liesbeth Van Der Meer, Matthias Gorny, Javier Sellanes, Carlos F. Gaymer, Eulogio H. Soto, Erin E. Easton, Alan M. Friedlander, Dhugal J. Lindsay, Tina N. Molodtsova

School of Earth, Environmental, & Marine Sciences Faculty Publications

The Salas y Gómez and Nazca ridges are two seamount chains of volcanic origin, which include over 110 seamounts that collectively stretch across over 2,900 km in the southeastern Pacific. Ecosystems in this region are isolated by the Atacama Trench, the Humboldt Current System, and an extreme oxygen minimum zone. This isolation has produced a unique biodiversity that is marked by one of the highest levels of marine endemism on Earth. These areas also provide important habitats and ecological stepping stones for whales, sea turtles, corals, and a multitude of other ecologically important species, including 82 species that are threatened …

Surface Freshwater Fluxes In The Arctic And Subarctic Seas During Contrasting Years Of High And Low Summer Sea Ice Extent, Sarah B. Hall, Bulusu Subrahmanyam, Ebenezer S. Nyadjro, Annette Samuelsen

Faculty Publications

Freshwater (FW) flux between the Arctic Ocean and adjacent waterways, predominantly driven by wind and oceanic currents, influences halocline stability and annual sea ice variability which further impacts global circulation and climate. The Arctic recently experienced anomalous years of high and low sea ice extent in the summers of 2013/2014 and 2012/2016, respectively. Here we investigate the interannual variability of oceanic surface FW flux in relation to spatial and temporal variability in sea ice concentration (SIC), sea surface salinity (SSS), and sea surface temperature (SST), focusing on years with summer sea–ice extremes. Our analysis between 2010–2018 illustrate high parameter variability, …

Geo-Spatial Modeling Of Carbon Sequestration Assessment In Date Palm, Abu Dhabi: An Integrated Approach Of Fieldwork, Remote Sensing, And Gis, Basam Saeed Dahy

Dissertations

The United Arab Emirates (UAE) has undertaken huge efforts to green the desert and afforestation projects (planted mainly with date palms) hence, reducing its carbon footprint, which have never been accounted for, because of lack of implemented mechanisms and tools to assess the amount of biomass and carbon stock (CS) sequestered by plants in the country. The purpose of this dissertation is to implement a new approach towards assessing the carbon sequestered by date palm (DP) plantations in Abu Dhabi, in both their biomass compartment as well as the soils under beneath, using geospatial technologies (RS and GIS) assessed by …

Intercropping Desmodium And Maize Improves Nitrogen And Phosphorus Availability And Performance Of Maize In Kenya, Pierre Celestin Ndayisaba, Shem Kuyah, Charles Aura Odhiambo Midega, Peter Njoroge Mwangi, Zeyaur Rahman Khan

All Peer-Reviewed Publications

Low levels of nitrogen (N) and phosphorus (P) in soils in sub-Saharan Africa (SSA) limit maize (Zea mays) production in smallholder farms. We tested the hypothesis that desmodium (Desmodium intortum (Mill.) Urb.), a fodder legume, and food legumes commonly grown with maize in Western Kenya avail N and P and improve the performance of maize in intercrops. We measured available N and P in 15 cm topsoil at 4, 8 and 12 weeks after planting (WAP), and corresponding maize shoot weight in three seasons: 2017 long rains (LR), 2017 short rains (SR), and 2018 LR at Thomas Odhiambo Campus of …

Reconstructing Surface Water Carbonate Ion Concentration Changes In The Eastern Equatorial Pacific Across Glacial Transitions, Lenzie Gail Ward

OES Theses and Dissertations

Today, the eastern equatorial Pacific (EEP) plays a critical role in the global CO₂ budget as a major source of CO₂ to the atmosphere, but recent studies suggest the region may shift to a sink for atmospheric CO₂ under different climate states. Here, I focus on two transitional periods, the last deglaciation (25 kyr to present) and last glaciation (the Marine Isotope Stage (MIS) 5a-4 transition, 96 to 60 kyr), to investigate how the carbon system in the EEP responds to major climate changes. I measured B/Ca ratios in the planktic foraminifera Globigerina bulloides from core MV1014-17JC …