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649 full-text articles. Page 3 of 24.

Soil Net Nitrogen Mineralisation Across Global Grasslands, A. C. Risch, S. Zimmermann, R. Ochoa-Hueso, M. Schütz, B. Frey, J. L. Firn, P. A. Fay, F. Hagedorn, E. T. Borer, E. W. Seabloom, W. S. Harpole, J. M. H. Knops, R. L. McCulley, A. A. D. Broadbent, C. J. Stevens, M. L. Silveira, Peter B. Adler, et al. 2019 Swiss Federal Institute for Forest, Snow and Landscape Research

Soil Net Nitrogen Mineralisation Across Global Grasslands, A. C. Risch, S. Zimmermann, R. Ochoa-Hueso, M. Schütz, B. Frey, J. L. Firn, P. A. Fay, F. Hagedorn, E. T. Borer, E. W. Seabloom, W. S. Harpole, J. M. H. Knops, R. L. Mcculley, A. A. D. Broadbent, C. J. Stevens, M. L. Silveira, Peter B. Adler, Et Al.

Wildland Resources Faculty Publications

Soil nitrogen mineralisation (Nmin), the conversion of organic into inorganic N, is important for productivity and nutrient cycling. The balance between mineralisation and immobilisation (net Nmin) varies with soil properties and climate. However, because most global-scale assessments of net Nmin are laboratory-based, its regulation under field-conditions and implications for real-world soil functioning remain uncertain. Here, we explore the drivers of realised (field) and potential (laboratory) soil net Nmin across 30 grasslands worldwide. We find that realised Nmin is largely explained by temperature of the wettest quarter, microbial biomass, clay content and bulk density. Potential N ...


Estimating Total And Bioavailable Nutrient Loading To Utah Lake From The Atmosphere, Janice Brahney 2019 Utah State University

Estimating Total And Bioavailable Nutrient Loading To Utah Lake From The Atmosphere, Janice Brahney

Watershed Sciences Faculty Publications

Anthropogenic activities have led to increases in the emission, atmospheric transport, and deposition of key nutrients. In addition, climate change along with anthropogenic soil disturbance has led to recent increases in the mobilization and transport of soils and other particles through the atmosphere, collectively described here as dust. These increased emissions have led to growing interest and concern over the composition of atmospheric deposition and total loading of nutrients to aquatic systems. In the last several decades, much effort has been directed towards the measurement and modeling of nitrogen deposition through wet and aerosol deposition. Less is known about the ...


Green Club After School Program Curriculum, Megan Willburn 2019 University of Nebraska - Lincoln

Green Club After School Program Curriculum, Megan Willburn

Honors Expanded Learning Clubs

Green Club is an after school program which encourages students to develop environmental empathy, passions for environmental sustainability, and knowledge about the workings of environmental systems.


Timing Of Invasion By Africanized Bees Coincides With Local Extinction Of A Specialized Pollinator Of A Rare Poppy In Utah, Usa, Amber D. Tripodi, Vincent J. Tepedino, Zachary M. Portman 2019 USDA-ARS-Pollinating Insects Research Unit, USA

Timing Of Invasion By Africanized Bees Coincides With Local Extinction Of A Specialized Pollinator Of A Rare Poppy In Utah, Usa, Amber D. Tripodi, Vincent J. Tepedino, Zachary M. Portman

All PIRU Publications

The introduction of exotic species can have profound impacts on mutualisms between native species in invaded areas. However, determining whether a new invader has impacted native species depends on accurately reconstructing the invasion timing. The arrival of Africanized honey bees (AHB) in southern Utah at some point between 1994 and 2011 has recently been implicated in the local extinction of Perdita meconis, a native specialist pollinator of an endangered poppy, Arctomecon humilis. Although AHBs were purportedly first detected in southern Utah in 2008, their presence in nearby Nevada, Arizona, and New Mexico by 1998–2001 suggests that they may have ...


Investigating The Knowledge Surrounding Folate And Folic Acid In A Cohort Of Vegetarians, Michael Dolan, Katherine Younger, Lucy Brennan, Jessica Roche 2019 Technological University Dublin

Investigating The Knowledge Surrounding Folate And Folic Acid In A Cohort Of Vegetarians, Michael Dolan, Katherine Younger, Lucy Brennan, Jessica Roche

Sure-J: Science Undergraduate Research Journal

Background
The aim is to identify any gaps in the knowledge of folate and folic acid in vegetarians, which is of interest given the increasing adoption of vegetarian type diets.

Methods
In this convenience sample, 106 people answered an online questionnaire regarding folate intake and awareness among vegetarians. This was created using Google Forms and was shared via Facebook, including on various national and college vegetarian group pages. There were 44 questions. Twenty-four participants were excluded, because they reported eating fish, chicken or other meat. Final data analysis included 82 subjects. The majority of these vegetarians were females over the ...


Effects Of Severe Water Stress On Maize Growth Processes In The Field, Libing Song, Jiming Jin, Jianqiang He 2019 Northwest A&F University

Effects Of Severe Water Stress On Maize Growth Processes In The Field, Libing Song, Jiming Jin, Jianqiang He

Watershed Sciences Faculty Publications

In this study, we investigated the effects of water stress on the growth and yield of summer maize (Zea mays L.) over four phenological stages: Seedling, jointing, heading, and grain-filling. Water stress treatments were applied during each of these four stages in a water-controlled field in the Guanzhong Plain, China between 2013 and 2016. We found that severe water stress during the seedling stage had a greater effect on the growth and development of maize than stress applied during the other three stages. Water stress led to lower leaf area index (LAI) and biomass owing to reduced intercepted photosynthetically active ...


A Case For Eustress In Grazing Animals, Juan J. Villalba, Xavier Manteca 2019 Utah State University

A Case For Eustress In Grazing Animals, Juan J. Villalba, Xavier Manteca

Wildland Resources Faculty Publications

Herbivores grazing in extensive systems are exposed to a series of challenges, rooted in the inherent spatial and temporal variability of their environment that potentially constrain their health, nutrition, and welfare. Nevertheless, in this review, we argue that challenges induced by some biotic (e.g., vegetation) and abiotic (e.g., terrain) factors may also be viewed as “positive” sources of stress or eustress, since they present complex problems, that when solved successfully elicit a greater degree of behavioral plasticity and adaptability in grazing animals. Chemically and structurally diverse landscapes require animals to display complex behaviors and exhibit adaptive capabilities, like ...


Use Of Low-Cost Ambient Particulate Sensors In Nablus, Palestine With Application To The Assessment Of Regional Dust Storms, Abdelhaleem Khader, Randal S. Martin 2019 An-Najah National University

Use Of Low-Cost Ambient Particulate Sensors In Nablus, Palestine With Application To The Assessment Of Regional Dust Storms, Abdelhaleem Khader, Randal S. Martin

Publications

Few air pollutant studies within the Palestinian territories have been reported in the literature. In March–April and May–June of 2018, three low-cost, locally calibrated particulate monitors (AirU’s) were deployed at different elevations and source areas throughout the city of Nablus in Northern West Bank, Palestine. During each of the three-week periods, high but site-to-site similar particulate matter less than 2.5 µm in aerodynamic diameter (PM2.5) and less than 10 µm (PM10) concentrations were observed. The PM2.5 concentrations at the three sampling locations and during both sampling periods averaged 38.2 ± 3 ...


Climate Change Accelerates Recovery Of The Tatra Mountain Lakes From Acidification And Increases Their Nutrient And Chlorophyll A Concentrations, Jiří Kopáček, Jiří Kaňa, Svetlana Bičárová, Janice Brahney, Tomáš Navrátil, Stephen A. Norton, Petr Porcal, Evžen Stuchlik 2019 University of South Bohemia

Climate Change Accelerates Recovery Of The Tatra Mountain Lakes From Acidification And Increases Their Nutrient And Chlorophyll A Concentrations, Jiří Kopáček, Jiří Kaňa, Svetlana Bičárová, Janice Brahney, Tomáš Navrátil, Stephen A. Norton, Petr Porcal, Evžen Stuchlik

Watershed Sciences Faculty Publications

We evaluated changes in the concentration of cations, anions, nutrients (dissolved organic carbon, DOC; phosphorus, P; and nitrogen forms including nitrate, NO3 and total organic nitrogen, TON), and chlorophyll a (Chl-a) in 31 Tatra Mountain lakes in Slovakia and Poland during their recovery from acidic deposition (1992–2018). Typical effects of decreasing acidic deposition on the lakes’ water composition, such as decreasing base cation concentrations, were confounded by climate change and catchment characteristics, including areal proportions of well-developed soils and scree. A climate-related increase in physical erosion provided freshly exposed unweathered granodiorite (the dominant bedrock) to chemical weathering ...


The Future Of Blue Carbon Science, Peter I. Macreadie, Andrea Anton, John A. Raven, Nicola Beaumont, Rod M. Connolly, Daniel A. Friess, Jeffrey J. Kelleway, Hilary Kennedy, Tomohiro Kuwae, Paul S. Lavery, Catherine E. Lovelock, Dan A. Smale, Eugenia T. Apostolaki, Trisha B. Atwood, Jeff Baldock, Thomas S. Bianchi, Gail L. Chmura, Bradley D. Eyre, James W. Fourqurean, Jason M. Hall-Spencer, Mark Huxham, Iris E. Hendriks, Dorte Krause-Jensen, Dan Laffoley, Tiziana Luisetti, Núria Marbà, Pere Masque, Karen J. McGlathery, J. Patrick Megonigal, Daniel Murdiyarso, Bayden D. Russell, Rui Santos, Oscar Serrano, Brian R. Silliman, Kenta Watanabe, Carlos M. Duarte 2019 Deakin University

The Future Of Blue Carbon Science, Peter I. Macreadie, Andrea Anton, John A. Raven, Nicola Beaumont, Rod M. Connolly, Daniel A. Friess, Jeffrey J. Kelleway, Hilary Kennedy, Tomohiro Kuwae, Paul S. Lavery, Catherine E. Lovelock, Dan A. Smale, Eugenia T. Apostolaki, Trisha B. Atwood, Jeff Baldock, Thomas S. Bianchi, Gail L. Chmura, Bradley D. Eyre, James W. Fourqurean, Jason M. Hall-Spencer, Mark Huxham, Iris E. Hendriks, Dorte Krause-Jensen, Dan Laffoley, Tiziana Luisetti, Núria Marbà, Pere Masque, Karen J. Mcglathery, J. Patrick Megonigal, Daniel Murdiyarso, Bayden D. Russell, Rui Santos, Oscar Serrano, Brian R. Silliman, Kenta Watanabe, Carlos M. Duarte

Watershed Sciences Faculty Publications

The term Blue Carbon (BC) was first coined a decade ago to describe the disproportionately large contribution of coastal vegetated ecosystems to global carbon sequestration. The role of BC in climate change mitigation and adaptation has now reached international prominence. To help prioritise future research, we assembled leading experts in the field to agree upon the top-ten pending questions in BC science. Understanding how climate change affects carbon accumulation in mature BC ecosystems and during their restoration was a high priority. Controversial questions included the role of carbonate and macroalgae in BC cycling, and the degree to which greenhouse gases ...


Tannin-Containing Legumes And Forage Diversity Influence Foraging Behavior, Diet Digestibility, And Nitrogen Excretion By Lambs, Sebastian Lagrange, Juan J. Villalba 2019 Utah State University

Tannin-Containing Legumes And Forage Diversity Influence Foraging Behavior, Diet Digestibility, And Nitrogen Excretion By Lambs, Sebastian Lagrange, Juan J. Villalba

Wildland Resources Faculty Publications

Diverse combinations of forages with different nutrient profiles and plant secondary compounds may improve intake and nutrient utilization by ruminants. We tested the influence of diverse dietary combinations of tannin- (sainfoin-Onobrichis viciifolia; birdsfoot trefoil-Lotus corniculatus) and non-tannin- (alfalfa-Medicago sativa L.) containing legumes on intake and diet digestibility in lambs. Freshly cut birdsfoot trefoil, alfalfa, and sainfoin were offered in ad libitum amounts to 42 lambs in individual pens assigned to 7 treatments (6 animals/treatment): 1) single forage species (sainfoin [SF], birdsfoot trefoil [BFT], and alfalfa [ALF]), 2) all possible 2-way choices of the 3 forage species ...


A Review And Updated Classification Of Pollen Gathering Behavior In Bees (Hymenoptera, Apoidea), Zachary M. Portman, Michael C. Orr, Terry Griswold 2019 Utah State University

A Review And Updated Classification Of Pollen Gathering Behavior In Bees (Hymenoptera, Apoidea), Zachary M. Portman, Michael C. Orr, Terry Griswold

All PIRU Publications

Pollen is the primary protein and nutrient source for bees and they employ many different behaviors to gather it. Numerous terms have been coined to describe pollen gathering behaviors, creating confusion as many are not clearly-defined or overlap with existing terms. There is a need for a clear yet flexible classification that enables accurate, succinct descriptions of pollen gathering behaviors to enable meaningful discussion and comparison. Here, we classify the different pollen gathering behaviors into two main classes: active and incidental pollen collection. Active pollen collection is subdivided into six behaviors: scraping with the extremities, buzzing, rubbing with the body ...


Controls And Adaptive Management Of Nitrification In Agricultural Soils, Jeanette M. Norton, Yang Ouyang 2019 Utah State University

Controls And Adaptive Management Of Nitrification In Agricultural Soils, Jeanette M. Norton, Yang Ouyang

Plants, Soils, and Climate Faculty Publications

Agriculture is responsible for over half of the input of reactive nitrogen (N) to terrestrial systems; however improving N availability remains the primary management technique to increase crop yields in most regions. In the majority of agricultural soils, ammonium is rapidly converted to nitrate by nitrification, which increases the mobility of N through the soil matrix, strongly influencing N retention in the system. Decreasing nitrification through management is desirable to decrease N losses and increase N fertilizer use efficiency. We review the controlling factors on the rate and extent of nitrification in agricultural soils from temperate regions including substrate supply ...


On-The-Road Testing Of The Effects Of Driver’S Experience, Gender, Speed, And Road Grade On Car Emissions, Abdelhaleem I. Khader, Randy S. Martin 2019 An-Najah National University

On-The-Road Testing Of The Effects Of Driver’S Experience, Gender, Speed, And Road Grade On Car Emissions, Abdelhaleem I. Khader, Randy S. Martin

Publications

On-road vehicles have become a dominant source of air pollution and energy consumption in many parts of the world. As a result, estimating the amount of pollution from these vehicles and analyzing the factors affecting their emission is necessary to understand and manage ambient air quality. Traditionally, automobile emissions have been measured with dynamometer tests using representative driving cycles. A review of the related literature shows that there is a lack of real life, on-the-road testing of automobile emissions. Moreover, a few previous studies have directly discussed the impact of driver variability on emissions from the vehicles. This research analyzes ...


Environmental Differences Between Migratory And Resident Ungulates—Predicting Movement Strategies In Rocky Mountain Mule Deer (Odocoileus Hemionus) With Remotely Sensed Plant Phenology, Snow, And Land Cover, Benjamin Robb, Qiongyu Huang, Joseph O. Sexton, David C. Stoner, Peter Leimgruber 2019 University of Wyoming

Environmental Differences Between Migratory And Resident Ungulates—Predicting Movement Strategies In Rocky Mountain Mule Deer (Odocoileus Hemionus) With Remotely Sensed Plant Phenology, Snow, And Land Cover, Benjamin Robb, Qiongyu Huang, Joseph O. Sexton, David C. Stoner, Peter Leimgruber

Wildland Resources Faculty Publications

Migration is a valuable life history strategy for many species because it enables individuals to exploit spatially and temporally variable resources. Globally, the prevalence of species’ migratory behavior is decreasing as individuals forgo migration to remain resident year-round, an effect hypothesized to result from anthropogenic changes to landscape dynamics. Efforts to conserve and restore migrations require an understanding of the ecological characteristics driving the behavioral tradeoff between migration and residence. We identified migratory and resident behaviors of 42 mule deer (Odocoileus hemionus) based on GPS locations and correlated their locations to remotely sensed indicators of forage quality, land cover, snow ...


The Differences Between Rewilding And Restoring An Ecologically Degraded Landscape, Johan du Toit, Nathalie Pettorelli 2019 Utah State University

The Differences Between Rewilding And Restoring An Ecologically Degraded Landscape, Johan Du Toit, Nathalie Pettorelli

Wildland Resources Faculty Publications

  1. Rewilding is a developing concept in ecosystem stewardship that involves reorganizing and regenerating wildness in an ecologically degraded landscape, with present and future ecosystem function being of higher consideration than historical benchmark conditions. This approach differs from ecosystem restoration but the two concepts are often conflated because (a) they both rely on similar management actions (at least initially) and (b) it can be erroneously assumed that they both aim for similar states of wildness.
  2. Rewilding and restoring both influence biodiversity, and common management actions such as species reintroductions (e.g. beavers or wolves) can be integral to a rewilding project ...


Whole-Brain Approaches For Investigating Iron Accumulation By Mri Show No Excess From Occupational Exposure To Welding Fumes, Jennifer Davis 2019 Purdue University

Whole-Brain Approaches For Investigating Iron Accumulation By Mri Show No Excess From Occupational Exposure To Welding Fumes, Jennifer Davis

The Journal of Purdue Undergraduate Research

No abstract provided.


Temperature Triggers A Non-Linear Response In Resource–Consumer Interaction Strength, Gustavo S. Betini, Tal Avgar, Kevin S. McCann, John M. Fryxell 2019 University of Guelph

Temperature Triggers A Non-Linear Response In Resource–Consumer Interaction Strength, Gustavo S. Betini, Tal Avgar, Kevin S. Mccann, John M. Fryxell

Wildland Resources Faculty Publications

Although temperature is recognized as a major determinant of many ecological processes, it is still not clear whether temperature increase caused by climate change will strengthen or weaken species interactions. One hypothesis is that interactions will respond non‐monotonically to temperature because thermal performance curves, which determine the strength of these interactions, are also non‐monotonic. To evaluate this hypothesis, we developed a temperature‐dependent consumer–resource model and tested predictions from this model in large freshwater mesocosms populated with green algae (Chlorella vulgaris) and herbivorous zooplankton (Daphnia magna). We found both in the model simulations and empirical investigations that ...


Ant Diversity Patterns Across Tropical Elevation Gradients: Effects Of Sampling Method And Subcommunity, John T. Longino, Michael G. Branstetter, Philip S. Ward 2019 University of Utah

Ant Diversity Patterns Across Tropical Elevation Gradients: Effects Of Sampling Method And Subcommunity, John T. Longino, Michael G. Branstetter, Philip S. Ward

All PIRU Publications

Local diversity may be influenced by niche assembly processes involving competition for limited resources, or by niche conservatism and the length of time clades have had to diversify. Mid‐elevation peaks in ant diversity on wet forest elevational gradients are most consistent with niche conservatism effects. However, it is possible that subsets of the ant community vary in the degree to which niche assembly processes are important, and this may be revealed by sampling methods that bias toward particular subsets. A previous study of ant‐elevation patterns in Middle American wet forest relied on Winkler sampling, a method that samples ...


Applied Scientific Demiurgy I – Entrance Examination Information Sheet, Mario Daniel Martín 2019 The Australian National University

Applied Scientific Demiurgy I – Entrance Examination Information Sheet, Mario Daniel Martín

Journal of Humanistic Mathematics

This document provides all the required information needed by aspiring demiurges to sit the entrance examination for the foundation course Applied Scientific Demiurgy I in the scientific stream of the Bachelor of Applied Demiurgy at the Topological Hyper-university of Technological Cosmology.


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