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| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
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Ehleringer, James R.; Negus, Norman C. | Red Butte Canyon Research Natural Area: history, flora, geology, climate, and ecology | Red Butte Canyon is a protected, near pristine canyon entering Salt Lake Valley, Utah. It contains a well-developed riparian zone and a perennial stream; hillside vegetation ranges from grasslands on the lower limits to Douglas-fir and aspen stands at the upper elevations. In this paper we describe ... | Intermountain West; Grassland; Oak-maple; Plant adaptation; Red Butte Canyon Research Natural Area; Human impact | 1992 |
| 2 |
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Hultine, Kevin; Bush, Sarah Elizabeth; Ehleringer, James R. | Effect of gender on sap-flux-scaled transpiration in a dominant riparian tree species: Box elder (Acer negundo) | Acer negundo is a dioecious riparian tree species with a spatial segregation of the sexes along soil moisture gradients. Females are typically more common in wet sites along streams (typically F/M = 1.6), whereas males are more common in drier sites away from streams (typically F/M = 0.6). Spatial s... | Density; Ecosystem; Segregation | 2007 |
| 3 |
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Ehleringer, James R. | Intra- and interspecific variation for summer precipitation use in pinyon-juniper woodlands | In the arid southwest of North America, winter precipitation penetrates to deep soil layers, whereas summer"monsoon" precipitation generally wets only surface layers. Use of these spatially separated water sources was determined for three dominant tree species of the pinyon-juniper ecosystem at six ... | D/H ratios; Juniperus osteosperma; Pinus edulis; pinyon-juniper ecosystem; plant water sources; precipitation use; Quercus gambelii; roots; Photosynthetic gas exchange; Monsoon | 2000 |
| 4 |
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Ehleringer, James R.; Bush, Sarah Elizabeth | Ecophysiology of riparian cottonwood and willow before, during, and after two years of soil water removal | Riparian cottonwood/willow forest assemblages are highly valued in the southwestern United States for their wildlife habitat, biodiversity, and watershed protection. Yet these forests are under considerable threat from climate change impacts on water resources and land-use activities to support hum... | Riparian cottonwood; Riparian willow; Soil water removal; Coyote willow; Drought recovery; Populus fremontii; Riparian ecology; Red Butte Canyon Research Natural Area; Salix exigua; Stem sap flux; Leaf carbon isotope ratios | 2010 |
| 5 |
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Bowling, David R. | Impacts of anthropogenic emissions and cold air pools on urban to montane gradients of snowpack ion concentrations in the Wasatch Mountains, Utah | Urban montane valleys are often characterized by periodic wintertime temperature inversions (cold air pools) that increase atmospheric particulate matter concentrations, potentially stimulating the deposition of major ions to these snow-covered ecosystems. We assessed spatial and temporal patterns o... | 2014-01-01 | |
| 6 |
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Ehleringer, James R.; Rickart, Eric Allan; Dearing, Maria-Denise | Stable isotope ratios (?15N AND ?13C) of syntopic shrews (SOREX) | Local species richness in shrew (Soricidae) assemblages is often high, and the mechanisms of ecological separation remain relatively unexplored. In this study, hair samples from 6 species of Sorex in 3 separate assemblages were analyzed for stable carbon (13C/12C) and nitrogen (15N/14N) isotope rati... | 2004 | |
| 7 |
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Ehleringer, James R. | Potential adaptability and constraints of response to changing climates for Encelia farinosa var. phenicodonta from southern Baja California, Mexico | To examine the physiological adaptability of Encelia farinosa var. phenicodonta from southern Baja California, plants from Todos Santos, BCS were raised in central Arizona where winter-spring precipitation is greater than typically experienced by this variety. Plants were capable of high photosynthe... | Encelia farinosa var. phenicodonta; Ecophysiology | 1996 |
| 8 |
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Davidson, Diane W.; Rickart, Eric Allan; Keiter, Robert B. | Selecting wilderness areas to conserve Utah's biological diversity | Congress is currently evaluating the wilderness status of Bureau of Land Management (BLM) public lands in Utah. Wilderness areas play many important roles, and one critical role is the conservation of biological diversity. | Bureau of Land Management; Conservation; Endemic species; Exotic species; Cryptobiotic soils; Plants; Bees; Vertebrates | 1996 |
| 9 |
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Davidson, Diane W. | Microtopography of microbiotic crusts on the Colorado Plateau, and distribution of component organisms | We analyzed the microtopography of microbiotic soil crusts at 3 sites on the Colorado Plateau of southern Utah and investigated distributions of cyanobacteria and several lichens in distinctive microhabitats created by this topography. At all 3 sites the long axes of linear soil mounds were oriented... | Microtopography; Microbiotic crusts; Colorado Plateau; Cryptobiotic soil; Colonization; Nonrandom orientation; Exposure; Collema; Disturbance history; Microhabitat | 2000 |
| 10 |
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Ehleringer, James R. | Plant adaptation in the Great Basin and Colorado Plateau | Adaptive features of plants of the Great Basin are reviewed. The combination of cold winters and an arid to semiarid precipitation regime results in the distinguishing features of the vegetation in the Great Basin and Colorado Plateau. The primary effects of these climatic features arise from how t... | Plant adaptation; Great Basin; Colorado Plateau; Cold deserts | 1992 |
| 11 |
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Clayton, Dale H.; Rogers, Alan R. | Genetic analysis of lice supports direct contact between modern and archaic humans | Parasites can be used as unique markers to investigate host evolutionary history, independent of host data. Here we show that modern human head lice, Pediculus humanus, are composed of two ancient lineages, whose origin predates modern Homo sapiens by an order of magnitude (ca. 1.18 million years). | Pediculus humanus; Head lice; Molecular phylogeny; Phthirus | 2004 |
| 12 |
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Bowling, David R. | Interannual variation in seasonal drivers of soil respiration in a semi-arid Rocky Mountain meadow | Semi-arid ecosystems with annual moisture inputs dominated by snowmelt cover much of the western United States, and a better understanding of their seasonal drivers of soil respiration is needed to predict consequences of climatic change on soil CO2 efflux. We assessed the relative importance of tem... | 2012-01-01 | |
| 13 |
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Ehleringer, James R.; Belnap, Jayne | Sensitivity of the Colorado plateau to change: climate, ecosystems, and society | The Colorado Plateau is located in the interior, dry end of two moisture trajectories coming from opposite directions, which have made this region a target for unusual climate fluctuations. A multidecadal drought event some 850 years ago may have eliminated maize cultivation by the first human settl... | Colorado Plateau; Biological crust; Climate change; Megadrought; Ranching; Dry crop productivity; Extractive industries; Pueblo Indians; Fremont culture | 2008 |
| 14 |
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Olivera, Baldomero M.; Hillyard, David R. | Heterodimeric structure of the spider toxin ω-Agatoxin IA revealed by precursor analysis and mass spectrometry | We report the first molecular characterization of a precursor sequence for a small, Ca2+ channel blocking, peptide spider toxin, ω-agatoxin IA. By integrating information generated from a molecular genetic approach using agatoxin cDNAs with data provided from mass spectrometry of the mature tox... | Spider toxin w-Aga-IA; Heterodimeric structure | 1992 |
| 15 |
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Sperry, John S. | Relationship between xylem conduit diameter and cavitation caused by freezing | The centrifuge method for measuring the resistance of xylem to cavitation by water stress was modified to also account for any additional cavitation that might occur from a freeze-thaw cycle. A strong correlation was found between cavitation by freezing and mean conduit diameter. | Embolism; freezing stress; hydraulic conductivity | 1999 |
| 16 |
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Ehleringer, James R. | Carbon isotope discrimination and water relations of oak hybrid populations in southwestern Utah | The evergreen oak Quercus turbinella and the deciduous Q. gambelii form natural hybrids in southwestern Utah and northern Arizona. Hybrid individuals also are found in northern Utah in a region where only Q. gambelii currently exists, indicating that Q. turbinella has recently retreated southward. ... | Quercus turbinella; Oak hybrids; Leaf structure; Leaf nitrogen; Carbon isotope discrimination; Water potential; Oak ecology | 2000 |
| 17 |
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Linton, Matthew J. | Hydraulic conductivity, xylem cavitation, and water potential for succulent leaves of agave deserti and agave tequilana | Axial hydraulic conductivity (Kh) was measured for fresh, dehydrated, and rehydrated leaves of the Crassulacean acid metabolism (CAM) leaf succulents, Agave deserti and Agave tequilana. Dehydration of leaves at 35(o)C for several hours caused Kh to decrease, with a 50% decrease occurring at a leaf w... | Transpiration; Dehydrated; Drought | 2001 |
| 18 |
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Bohs, Lynn A. | ITS phylogeny of Balsamorhiza and Wyethia (Asteraceae: Heliantheae) | The relationships among the species of Balsamorhiza and Wyethia (Asteraceae: Heliantheae) were examined using data from the internal transcribed spacer (ITS) region of the nuclear ribosomal DNA. The ITS sequences were obtained from nine species of Balsamorhiza and 14 species of Wyethia as well as se... | Asteraceae; Balsamorhiza; Heliantheae; Internal transcribed spacer; ITS; Molecular phylogeny; Wvethi | 2003 |
| 19 |
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Bowling, David R. | Assessing filtering of mountaintop CO2 mole fractions for application to inverse models of biosphere-atmosphere carbon exchange | There is a widely recognized need to improve our understanding of biosphere-atmosphere carbon exchanges in areas of complex terrain including the United States Mountain West. CO2 fluxes over mountainous terrain are often difficult to measure due to unusual and complicated influences associated with ... | 2012-01-01 | |
| 20 |
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Ehleringer, James R.; Bush, Sarah Elizabeth; Solomon, Douglas Kip | Ecohydrology in a Colorado River riparian forest: implications for the decline of Populus fremontii | Populus fremontii (Fremont cottonwood) was once a dominant species in desert riparian forests but has been increasingly replaced by the exotic invasive Tamarix ramosissima (saltcedar). Interspecific competition, reduced flooding frequency, and increased salinity have been implicated in the widespre... | Populus fremontii; Decline; Colorado River; Utah; Invasive species; Riparian; Salinity; Sap flow; Tamarix ramosissima; Transpiration | 2005 |
| 21 |
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Ehleringer, James R. | Interspecific competition and resource pulse utilization in a cold desert community | In desert ecosystems a large proportion of water and nitrogen is supplied in rain-induced pulses. It has been suggested that competitive interactions among desert plants would be most intense during these pulse periods of high resource availability. We tested this hypothesis with three cold desert s... | Atriplex confertifolia; Chrysothamnus nauseosus; Colorado Plateau; desert; Gutierrezia sarothrae; Neighbor removal; Plant competition; Resource pulses; Pulse utilization; Stable isotopes; Water uptake | 2002 |
| 22 |
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Adler, Frederick R. | Role of heterogeneity in the persistence and prevalence of sin nombre virus in deer mice | Many diseases persist at a relatively low prevalence, seemingly close to extinction. For a chronic disease in a homogeneous population, reducing the transmission rate by a fraction proportional to the prevalence would be sufficient to eradicate the disease. This study examines how higher prevalence ... | Transmission; Survivorship; Seropositivity | 2008 |
| 23 |
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Sperry, John S. | Shoot dieback during prolonged drought in Ceanothus (Rhamnaceae) chaparral of California: a possible case of hydraulic failure | Progressive diebacks of outer canopy branchlets of Ceanothus crassifolius were repeatedly observed after rainless periods up to 9 mo in duration in the Santa Monica Mountains of southern California. Mean xylem pressures of branchlets near the end of drought were as low as -11.2 MPa (N = 22) with a m... | Water relations; xylem cavitation; water-stress-induced loss | 2002 |
| 24 |
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Bohs, Lynn A. | New species of Solanum and Capsicum (Solanaceae) from Bolivia, with clarification of nomenclature in some Bolivian Solanum | Bolivian floristic diversity is high, reflecting its great topographic and habitat diversity. Habitats in Bolivia range from seasonally flooded savannas to arid Chaco and high elevation deserts to hyper-humid montane and lowland rainforests. | Capsicum; Solanum; Bolivia; Biodiversity | 2006 |
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