Search Results - "Westfall, Robert D"

Geographic, hydrological, and climatic significance of rock glaciers in the Great Basin, USA by Millar, Constance I., Westfall, Robert D.

“…We present the first comprehensive inventory and analysis of rock glaciers in the hydrographic Great Basin (GB), United States, documenting 842 features (mean…”
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Thermal Regimes and Snowpack Relations of Periglacial Talus Slopes, Sierra Nevada, California, U.S.A by Millar, Constance I, D. Westfall, Robert, Delany, Diane L

“…Thermal regimes of eight periglacial talus slopes, at contrasting elevations, aspects, and substrates, in the Sierra Nevada, California, had complex…”
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Distribution, climatic relationships, and status of American pikas (Ochotona princeps) in the Great Basin, USA by Millar, Constance I., Delany, Diane L., Hersey, Kimberly A., Jeffress, Mackenzie R., Smith, Andrew T., Van Gunst, K. Jane, Westfall, Robert D.

“…To advance understanding of the distribution, climatic relationships, and status of American pikas (Ochotona princeps) in the Great Basin, United States, we…”
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New Records of Marginal Locations for American Pika (Ochotona princeps) in the Western Great Basin by Millar, Constance I., Westfall, Robert D., Delany, Diane L.

“…We describe 46 new site records documenting occupancy by American pika (lOchotona princeps) at 21 locations from 8 mountain regions in the western Great Basin,…”
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From treeline to species line: Thermal patterns and growth relationships across the krummholz zone of whitebark pine, Sierra Nevada, California, USA by Millar, Constance I., Delany, Diane L., Westfall, Robert D.

“…A multiyear study of forest-to-alpine ecotones across extensive krummholz zones in whitebark pine (WBP; Pinus albicaulis), Sierra Nevada, California, resolved…”
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A complex patterned-ground ecosystem in the Sierra Nevada, California, USA supports unusual habitat for American pika by Millar, Constance I., Westfall, Robert D.

“…A complex landscape lies on an alpine plateau in the high Sierra Nevada, California, and comprises spatially organized physical and ecological features that…”
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Distribution and Climatic Relationships of the American Pika (Ochotona princeps) in the Sierra Nevada and Western Great Basin, U.S.A.; Periglacial Landforms as Refugia in Warming Climates by Millar, Constance I, Westfall, Robert D

“…We used a rapid assessment to survey American pika (Ochotona princeps) populations and documented 420 pika site occurrences in southwestern U.S.A. These…”
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Thermal Components of American Pika Habitat—How does a Small Lagomorph Encounter Climate? by Millar, Constance I, Westfall, Robert D, Delany, Diane L

“…Anticipating the response of small mammals to climate change requires knowledge of thermal conditions of their habitat during times of the day and year when…”
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Rock glaciers and related periglacial landforms in the Sierra Nevada, CA, USA; inventory, distribution and climatic relationships by Millar, Constance I., Westfall, Robert D.

“…Rock glaciers and related periglacial rock-ice features (RIFs) are abundant yet overlooked landforms in the Sierra Nevada, California, where they occur in…”
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Conserving the evolutionary potential of California valley oak (Quercus lobata Née): a multivariate genetic approach to conservation planning by GRIVET, DELPHINE, SORK, VICTORIA L, WESTFALL, ROBERT D, DAVIS, FRANK W

“…California valley oak (Quercus lobata Née) is a seriously threatened endemic oak species in California and a keystone species for foothill oak ecosystems…”
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Radiocarbon dating of American pika fecal pellets provides insights into population extirpations and climate refugia by Millar, Constance I, Heckman, Katherine, Swanston, Christopher, Schmidt, Karena, Westfall, Robert D, Delany, Diane L

“…The American pika ( Ochotona princeps ) has become a species of concern for its sensitivity to warm temperatures and potential vulnerability to global warming…”
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Using simulations and data to evaluate mean sensitivity (ζ) as a useful statistic in dendrochronology by Bunn, Andrew G., Jansma, Esther, Korpela, Mikko, Westfall, Robert D., Baldwin, James

“…Mean sensitivity (ζ) continues to be used in dendrochronology despite a literature that shows it to be of questionable value in describing the properties of a…”
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TWO-GENERATION ANALYSIS OF POLLEN FLOW ACROSS A LANDSCAPE. I. MALE GAMETE HETEROGENEITY AMONG FEMALES by Smouse, Peter E, Dyer, Rodney J, Westfall, Robert D, Sork, Victoria L

“…Gene flow is a key factor in the spatial genetic structure in spatially distributed species. Evolutionary biologists interested in microevolutionary processess…”
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Dissecting components of population-level variation in seed production and the evolution of masting behavior by Koenig, Walter D., Kelly, Dave, Sork, Victoria L., Duncan, Richard P., Elkinton, Joseph S., Peltonen, Mikko S., Westfall, Robert D.

“…Mast-fruiting or masting behavior is the cumulative result of the reproductive patterns of individuals within a population and thus involves components of…”
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Distribution and Climatic Relationships of the American Pika (Ochotona princeps) in the Sierra Nevada and Western Great Basin, U.S.A.; Periglacial Landforms as Refugia in Warming Climates. Reply by Millar, Constance I, Westfall, Robert D

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Response of Subalpine Conifers in the Sierra Nevada, California, U.S.A., to 20th-Century Warming and Decadal Climate Variability by Millar, Constance I., Westfall, Robert D., Delany, Diane L., King, John C., Graumlich, Lisa J.

“…Four independent studies of conifer growth between 1880 and 2002 in upper elevation forests of the central Sierra Nevada, California, U.S.A., showed correlated…”
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two-generation analysis of pollen pool genetic structure in flowering dogwood, Cornus florida (Cornaceae), in the Missouri Ozarks by Sork, V.L, Smouse, P.E, Apsit, V.J, Dyer, R.J, Westfall, R.D

“…Anthropogenic landscape change can disrupt gene flow. As part of the Missouri Ozark Forest Ecosystem Project, this study examined whether silvicultural…”
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Genetic consequences of forest population dynamics influenced by historic climatic variability in the western USA by Westfall, Robert D, Millar, Constance I

“…We review recent advances in climate science that show cyclic climatic variation over multiple time scales and give examples of the impacts of this variation…”
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Fine-scale genetic structure of whitebark pine (Pinus albicaulis): associations with watershed and growth form by Rogers, D.L. (University of California, Davis, CA.), Millar, C.I, Westfall, R.D

“…The fine-scale genetic structure of a subalpine conifer, whitebark pine (Pinus albicaulis Engelm.), was studied at nested geographic levels from watershed to…”
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Thermal and hydrologic attributes of rock glaciers and periglacial talus landforms: Sierra Nevada, California, USA by Millar, Constance I., Westfall, Robert D., Delany, Diane L.

“…To explore thermal regimes and hydrologic capacity of rock glaciers and related periglacial talus landforms, mini-thermochrons were deployed in and around…”
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