UScholar Works
 
Filters: Collection: "ir_uspace"
26 - 50 of 95
Number of results to display per page
CreatorTitleDescriptionSubjectDate
26 Hawkes, KristenHadza scavenging: implications for Plio/Pleistocene Hominid subsistenceThe frequent association of stone tools and large animal bones in African Plio/Pleistocene archaeological sites has long been taken as evidence of the importance of hunting in early hominid diets. Many now argue that it reflects hominid scavenging, not hunting.Hadza; Scavenging; Plio/Pleistocene; Hominid Diet1988-04
27 Adler, Robert W.Changing the Law-Science Paradigm for Colorado River RestorationLegal mandates and scientific realities conflict when existing legal principles do not match the realities and limits of current science. Those conflicts can be addressed if scientists communicate the limits of existing scientific capabilities and if the legal system responds accordingly2008
28 Farmer, Colleen G.Parental care: the key to understanding endothermy and other convergent features in birds and mammalsBirds and mammals share a number of features that are remarkably similar but that have evolved independently. One of these characters, endothermy, has been suggested to have played a cardinal role in avian and mammalian evolution. I hypothesize that it is parental care, rather than endothermy, that ...Evolution; Metabolism; Convergence2000
29 Davidson, Diane W.Dispersal adaptations of some acacia species in the Australian arid zoneMost Australian representatives of the genus Acacia have diaspores with arillate appendages indicative of adaptation for active dispersal by animals. Based on physical and chemical characteristics of these arils and mechanisms of diaspore presentation, a number of arid zone acacias can be distingu...Acacia; Australian arid zone; Dispersal ecology; Fruit quality; Myrmecochory; Ornithochory; Seed parasitoids; Soil nutrients1984
30 Clayton, Dale H.Molecular phylogeny of the dove genus Zenaida: mitochondrial and nuclear DNA sequencesWe reconstructed a phylogeny for the seven species of doves in the genus Zenaida on the basis of a combined analysis of mitochondria (ND2 and cytochrome b) and nuclear (fibrinogen intron 7) DNA sequences. This phylogeny, which is completely resolved, is well supported with all nodes showing greater...Molecular phylogeny; Dove; Nuclear DNA2000
31 Coley, Phyllis D.What's up? Perspectives from the first international forest canopy conference at Sarasota, Florida, 1994Jumars, caribineers, pole pruners, tree bicycles, Bosun's chairs, booms, peconhas . . . these terms are not listed in most biological dictionaries. Nor are construction cranes or large treehouses or hot-air dirigibles listed as priority equipment for any scientific laboratories. But these are th...1995
32 Keiter, Robert; Ruple, John; Tanana, HeatherPolicty Analysis of Produced Water Issues Associated with In-Situ Thermal TechnologiesABSTRACT Commercial scale oil shale and oil sands development will require water, the amount of which will depend on the technologies adopted and the scale of development that occurs. Water in oil shale and oil sands country is already in scarce supply, and because of the arid nature of the regi...2011-01
33 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
34 Farmer, Colleen G.The provenance of alveolar and parabronchial lungs: insights from paleoecology and the discovery of cardiogenic, unidirectional airflow in the American alligator (Alligator mississippiensis)Birds and mammals evolved greater aerobic abilities than their common ancestor had. This required expansion of the cardiopulmonary system's capacity for gas exchange, but while directional selection for his expanded capacity resulted in extremely similar avian and mammalian hearts, strikingly differ...2010-07
35 Venkatasubramanian, SureshSensor network localization for moving sensorsSensor network localization (SNL) is the problem of determining the locations of the sensors given sparse and usually noisy inter-communication distances among them. In this work we propose an iterative algorithm named PLACEMENT to solve the SNL problem. This iterative algorithm requires an initial ...2012-01-01
36 Sekercioglu, CaganChewing lice (Phthiraptera) species found on Turkish shorebirds (Charadriiformes)Approximately 4.500 species of lice have been so far described, with about 4.000 species seen on birds and with 3.000 species in the suborder Ischnocera 1. There are 465 bird species so far recorded in Turkey and the actual total is likely to exceed 500 species. However, the chewing lice fauna of th...2010-01-01
37 O'Rourke, Dennis H.Introduction: origins and settlement of the indigenous populations of the Aleutian ArchipelagoThe series of papers in this special issue of Human Biology use an interdisciplinary approach to address regional questions and to integrate disparate Aleutian data into a broad, synthetic effort. The contributors leverage decades of data on Aleut origins, biogeography, and behavior through integrat...2010
38 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
39 Broughton, JohnPristine benchmarks and indigenous conservation? Implications from California zooarchaeologyThe superabundance of tame wildlife during the early historic period in California astonished European explorers. And the historic accounts of incredible animal densities, most notably artiodactyls, have influenced a long-held perception that California Indians lived in harmony with nature. However,...2004-01-01
40 Broughton, JohnResource intensification and late Holocene human impacts on Pacific coast bird populations: evidence from the Emeryville shellmound avifaunaAnthropologists and conservation biologists have commonly assumed that the distributions and abundances of vertebrate resources recorded during the early historic period in North America reflected a "pristine" condition. This view follows from the perception that Native American population densities...Resource intensification; Holocene human impacts; Foraging efficiency; Harvest pressure; Bird populations; Emeryville shellmound2001
41 Sekercioglu, CaganChewing lice (phthiraptera) found on songbirds (Passeriformes) in TurkeyObjective: This study was performed to detect chewing lice species found on the songbirds at Lake Kuyucuk bird ringing station in the Kars province located in eastern Turkey. Methods: Chewing lice were collected from songbirds captured between September and October 2009. Fifty-one birds belonging t...2011-01-01
42 Clayton, Dale H.Darwins finches combat introduced nest parasites with fumigated cottonIntroduced parasites are a threat to biodiversity when naïve hosts lack effective defenses against such parasites [1]. Several parasites have recently colonized the Galápagos Islands, threatening native bird populations [2]. For example, the introduced parasitic nest fly Philornis downsi (Diptera:...2014-01-01
43 Potts, Wayne K.Fall migration of Golden Eagles in the Wellsville Mountains, Northern Utah, 1976-1979Migratory movements of Golden Eagles were investigated in detail as part of a 4-year autumn raptor migration study atop an 8,600-foot ridge in the Wellsville Mountains. In 856 observation hours (161 days) between 6 August and 28 November, 898 Golden Eagles (10% of the oral raptor flight) were counte...Wellsville Mountains; Golden eagles; Fall migration1984
44 Clayton, Dale H.Molecular phylogeny of the dove genera Streptopelia and ColumbaEvolutionary history of the dove genus Streptopelia has not been examined with rigorous phylogenetic methods. We present a study of phylogenetic relationships of Streptopelia based on over 3,600 base pairs of nuclear and mitochondrial gene sequences.Doves; Streptopelia; Columba2001
45 Cashdan, Elizabeth A.Competition between foragers and food producers on the Botletli River, BotswanaThe immigration of food-producing groups into areas occupied by hunters and gatherers must have been a common occurrence in prehistory. How were the hunter-gatherers affected by this? I describe here two groups of Kalahari Basarwa ('Bushmen'), one living along the flood plain of the lower Botletli ...Kalahari Basarwa; Bushmen; Foraging; Cattle1986
46 Simpson, Jamesina J.A novel ELF radar for major oil depositsThis letter proposes a novel extremely low frequency (ELF) radar for major oil deposits. Using our recently developed whole-Earth electromagnetic wave propagation model based upon the finite-difference time-domain method, we have determined that detection of the radial (vertical) component of the sc...2006-01-01
47 Freire, Juliana; Silva, Claudio T.Scientific exploration in the era of ocean observatoriesSociety's critical and urgent need to better understand the world's oceans is amply documented and has led to a unique convergence of operational and scientific interests in the US, organized around the concept of ocean observatories: cyber-­facilitated integrations of observations, simulations, a...Ocean observatories; Provenance2008-05
48 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
49 Steenburgh, William JamesClimate change and Utah: the scientific consenusThis report, entitled \"Climate Change and Utah: The Scientific Consensus\" was prepared for Utah Governor Jon Huntsman Jr. under the direction of his Blue Ribbon Advisory Council on Climate Change (BRAC). It summarizes current (2007) scientific understanding of climate change and its potential imp...Climate, Climate Change, Utah2007-09
50 Ehleringer, James R. ; Cerling, Thure E.Aberrant water homeostasis detected by stable isotope analysisWhile isotopes are frequently used as tracers in investigations of disease physiology (i.e., 14C labeled glucose), few studies have examined the impact that disease, and disease-related alterations in metabolism, may have on stable isotope ratios at natural abundance levels. The isotopic composition...2010-07-21
26 - 50 of 95