UScholar Works
 
Filters: Department: "Biology" Collection: "ir_uspace"
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CreatorTitleDescriptionSubjectDate
1 Ehleringer, James R.Seedling size and survival for Chrysothamnus nauseosusSeedling size and survival in relation to summer drought were examined for Chrysothamnus nauseosus growing under field and greenhouse conditions. In the field, summer survival rates were less than 2% annually for the three years monitored. The effect of initial seedling height on subsequent survival...Chrysothamnus nauseosus; Seedling size; Seedling survival1993
2 Ehleringer, James R.Plant adaptation in the Great Basin and Colorado PlateauAdaptive 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 deserts1992
3 Hultine, KevinComparison of methods to estimate Ephemeral Channel Recharge, Walnut Gulch, San Pedro River Basin, ArizonaEphemeral channel transmission loss represents an important groundwater surface water exchange in arid and semiarid regions and is potentially a significant source of recharge at the basin scale. Copyright [year] American Geophysical Union. Reproduced by permission of American Geophysical Union. ...Transport; Transmission; Balance2004
4 Davidson, Diane W.; Rickart, Eric Allan; Keiter, Robert B.Selecting wilderness areas to conserve Utah's biological diversityCongress 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; Vertebrates1996
5 Ehleringer, James R.; Belnap, JayneSensitivity of the Colorado plateau to change: climate, ecosystems, and societyThe 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 culture2008
6 Ehleringer, James R.Burning coal seams in southern Utah: a natural system for studies of plant responses to elevated CO2In the Burning Hills and Smoky Mountains of southern Utah (USA), coal deposits exposed to the surface have been ignited by lightning and have been burning for periods of years to over a century. We examined one of these sites, where the below-ground combustion of this low-sulfur coal releases gases ...Coal fires; Elevated CO2; Isotope ratios; Atriplex confertifolia; Salsola iberica; Gutierrezia sarothrae1997
7 Davidson, Diane W.Microtopography of microbiotic crusts on the Colorado Plateau, and distribution of component organismsWe 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; Microhabitat2000
8 Ehleringer, James R.; Cerling, Thure E.; Dearing, Maria-DeniseExperimental study of carbon-isotope fractionation between diet, hair, and feces of mammalian herbivoresThe carbon-isotope composition of hair and feces offers a glimpse into the diets of mammalian herbivores. It is particularly useful for determining the relative consumption of browse and graze in tropical environments, as these foods have strongly divergent carbon-isotope compositions. Fecal ?13C v...Fractionation; Mammalian herbivores; Medicago sativa; Cynodon dactylon2003
9 Seger, Jon; Davidson, Diane W.Biological richness of desertsA desert is "waterless," "treeless," "barren," "remote," "uninteresting," and "presumably uninhabited," according to the authoritative Oxford English Dictionary. The word is derived from deserere, a Latin verb meaning "to leave." In English, to desert is still to "abandon," "forsake," or "fail." Bec...Desert life; Desert biodiversity1995
10 Bohs, Lynn A.Phylogenetic relationships among the "spiny solanums" (Solanum subgenus Leptostemonum, Solanaceae)Species of Solanum subgenus Leptostemonum comprise almost one third of the genus and are distributed worldwide. Members of this group are defined by their sharp epidermal prickles; thus, they are commonly referred to as the ˜spiny solanums." This subgenus includes a number of economically important...Granule-bound starch synthase gene; GBSSI; Heterandry; ITS; Leptostemonum; Solanum; trnS-trnG; Waxy2006
11 Ehleringer, James R.; Bush, Sarah ElizabethEcophysiology of riparian cottonwood and willow before, during, and after two years of soil water removalRiparian 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 ratios2010
12 Bohs, Lynn A.Phylogeny of the Cyphomandra clade of the genus Solanum (Solanaceae) based on ITS sequence data13 major clades can be recognized within the genus Solatium (Solanaceae) based on chloroplast DNA sequence data. One of these is the Cyphomandra clade, which includes about 50 neotropical species. These have traditionally been placed into two or three sections: S. section Pachyphylla (formerly recog...Cyphomandra; ITS; osmophores; self-incompatibility; Solanum2007
13 Bowling, David R.Interannual variation in seasonal drivers of soil respiration in a semi-arid Rocky Mountain meadowSemi-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
14 Sekercioglu, CaganImportance of Ethiopian shade coffee farms for forest bird conservationCoffee is the most important tropical commodity and is grown in high-priority areas for biological conservation. There is abundant literature on the conservation value of coffee farms internationally, but there has been little research on this topic in Africa. Ethiopia is a diverse and little-studie...2014-01-01
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