Search Results - "Leffler, A J"

Snowier winters extend autumn availability of high‐quality forage for caribou in Arctic Alaska by Richert, J. C., Leffler, A. J., Spalinger, D. E., Welker, J. M.

“…Caribou (Rangifer tarandus) rely on the short Arctic growing season to restore body condition, support the demands of lactation, and prepare for the long…”
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Hydraulic Redistribution in a Stand of Artemisia tridentata: Evaluation of Benefits to Transpiration Assessed with a Simulation Model by Ryel, R. J., Caldwell, M. M., Yoder, C. K., D. Or, Leffler, A. J.

“…The significance of soil water redistribution facilitated by roots (an extension of "hydraulic lift", here termed hydraulic redistribution) was assessed for a…”
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Water Conservation in Artemisia tridentata through Redistribution of Precipitation by Ryel, R. J., Leffler, A. J., Peek, M. S., Ivans, C. Y., Caldwell, M. M.

“…Water conservation is important for plants that maintain physiologically active foliage during prolonged periods of drought. A variety of mechanisms for water…”
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Rapid Soil Moisture Recharge to Depth by Roots in a Stand of Artemisia tridentata by Ryel, R. J., Caldwell, M. M., Leffler, A. J., Yoder, C. K.

“…The temporal patterns of soil water potential in a stand of Artemisia tridentata in central Utah, USA, were monitored during the summer, which included small…”
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Arctic cyclone water vapor isotopes support past sea ice retreat recorded in Greenland ice by Klein, Eric S., Cherry, J. E., Young, J., Noone, D., Leffler, A. J., Welker, J. M.

“…Rapid Arctic warming is associated with important water cycle changes: sea ice loss, increasing atmospheric humidity, permafrost thaw and water-induced…”
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Carbon acquisition and water use in a Northern Utah Juniperus osteosperma (Utah juniper) population by Leffler, A Joshua, Ryel, Ronald J, Hipps, Larry, Ivans, Sasha, Caldwell, Martyn M

“…Water use and carbon acquisition were examined in a northern Utah population of Juniperus osteosperma (Torr.) Little. Leaf-level carbon assimilation, which was…”
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Nitrogen acquisition by annual and perennial grass seedlings: testing the roles of performance and plasticity to explain plant invasion by Leffler, A. J., Monaco, T. A., James, J. J.

“…Differences in resource acquisition between native and exotic plants is one hypothesis to explain invasive plant success. Mechanisms include greater resource…”
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Variation in carbon isotope composition among years in the riparian tree Populus fremontii by Leffler, A.J, Evans, A.S

“…Water availability is an important factor limiting the productivity of desert plants but little is known about the impact of water-limiting conditions on the…”
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Interactions among vegetation, climate, and herbivory control greenhouse gas fluxes in a subarctic coastal wetland by Kelsey, K. C., Leffler, A. J., Beard, K. H., Schmutz, J. A., Choi, R. T., Welker, J. M.

“…High‐latitude ecosystems are experiencing the most rapid climate changes globally, and in many areas these changes are concurrent with shifts in patterns of…”
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Using long-term datasets to study exotic plant invasions on rangelands in the western United States by Morris, C., Morris, L.R., Leffler, A.J., Holifield Collins, C.D., Forman, A.D., Weltz, M.A., Kitchen, S.G.

“…Invasions by exotic species are generally described using a logistic growth curve divided into three phases: introduction, expansion and saturation. This model…”
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A Mobile Instrumented Sensor Platform for Long-Term Terrestrial Ecosystem Analysis: An Example Application in an Arctic Tundra Ecosystem by Healey, N C, Oberbauer, S F, Ahrends, H E, Dierick, D, Welker, J M, Leffler, A J, Hollister, R D, Vargas, S A, Tweedie, C E

“…To address impacts of climate change on natural ecosystems, researchers need efficient and integrated ground- based sensor systems capable of detecting plant…”
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Hydraulic Redistribution through the Root Systems of Senesced Plants by Leffler, A. Joshua, Peek, Michael S., Ryel, Ron J., Ivans, Carolyn Y., Caldwell, Martyn M.

“…Hydraulic redistribution, the movement of water from soil layers of higher water potential to layers of lower water potential through the root systems of…”
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Long-term tree ring chronologies from sympatric tropical dry-forest trees: individualistic responses to climatic variation by ENQUIST, BRIAN J., LEFFLER, A. JOSHUA

“…The influence of local precipitation and temperature on long-term growth dynamics in two species of seasonally dry tropical forest trees were investigated…”
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Root Responses and Nitrogen Acquisition by Artemisia tridentata and Agropyron desertorum following Small Summer Rainfall Events by Ivans, Carolyn Y., Leffler, A. Joshua, Usha Spaulding, Stark, John M., Ryel, Ronald J., Caldwell, Martyn M.

“…Resources in the Great Basin of western North America often occur in pulses, and plant species must rapidly respond to temporary increases in water and…”
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Gas exchange and growth responses of the desert shrubs Artemisia tridentata and Chrysothamnus nauseosus to shallow- vs. deep-soil water in a glasshouse experiment by Leffler, A.Joshua, Ivans, Carolyn Y., Ryel, Ronald J., Caldwell, Martyn M.

“…The aridland shrub species, Artemisia tridentata (big sagebrush) and Chrysothamnus nauseosus (rubber rabbitbrush), are distributed widely in the Intermountain…”
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Carbon isotope composition of tree leaves from Guanacaste, Costa Rica: comparison across tropical forests and tree life history by LEFFLER, A. JOSHUA, ENQUIST, BRIAN J.

“…Despite the progress made in understanding the ecophysiology of tropical plants during the past two decades (Lüttge 1997, Mulkey et al. 1996), questions…”
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Implantable Cardioverter Defibrillator T Wave Oversensing Caused by Hyperglycemia by KRISHEN, AJAY, SHEPARD, RICHARD K., LEFFLER, JEANINE A., WOOD, MARK A., ELLENBOGEN, KENNETH A.

“…KRISHEN, A., et al.: Implantable Cardioverter Defibrillator T Wave Oversensing Caused by Hyperglycemia. This case report highlights a previously unreported…”
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Determination of trace aluminum in urine by neutron activation analysis by Blotcky, A. J, Hobson, D, Leffler, J. A, Rack, E. P, Recker, R. R

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Response of Water Vapor and CO₂ Fluxes in Semiarid Lands to Seasonal and Intermittent Precipitation Pulses by Ivans, Sasha, Hipps, Lawrence, Leffler, A. Joshua, Ivans, Carolyn Y.

“…Precipitation pulses are important in controlling ecological processes in semiarid ecosystems. The effects of seasonal and intermittent precipitation events on…”
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Evidence of aluminum absorption from the gastrointestinal tract and bone deposition by aluminum carbonate ingestion with normal renal function by Recker, R R, Blotcky, A J, Leffler, J A, Rack, E P

“…The question of whether aluminum is toxic in patients ingesting large oral loads, either for phosphate binding in renal dialysis or as an antacid for peptic…”
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