The purpose of this research was to determine whether hybridization between Amelanchier denticulata. (H.B.K.) Koch and Amelanchier nervosa (Decaisne) StandL occurs in Oaxaca, Mexico, and to evaluate components of yield and germination characteristics and seed dormancy of Amelanchier denticulata. Amelanchier nervosa and Amelanchier denticulata samples and morphological characters were used...
Remote sensing and Geographic Information Systems (GIS) are well known tools for the study of time change analysis in natural systems. However, long-term studies of riparian systems using large-scale aerial photography are less common. The purpose of this project was to combine large scale aerial photography, GIS, Global Positioning Systems...
Two small herds of Rocky Mountain (Cervus elaphus nelsoni) cow elk were, collared, observed, and spatially mapped for 10 continuous six day trials, conducted during 2008-2009. Five trials occurred during full moon periods and five trials during new moon periods. The elk were collared with 1 second interval GPS loggers...
This research examined the biology of barb goatgrass (Aegilops triuncialis L.) a weedy annual grass that is invading the rangelands of California. Germination and root growth characteristics of barb goatgrass were compared to soft chess (Bromis mollis L.), medusahead rye (Taeniatherum caput-medusae (L.) Nevski), slender wild oats (Avena barbata L.),...
We studied the distribution and habitat selection differences between
Spanish breed (Corriente and Longhorn mix) and British breed cattle (Angus,
Hereford). This study was located on the Zumwalt prairie during the spring and
fall and along the Imnaha river for the winter. Each trial ran for two weeks and in...
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Douglas Johnson
We studied the distribution and habitat selection differences between
The 1979 incident at Three Mile Island drew attention to weaknesses in the capability to obtain and analyze reactor coolant
samples in an environment where the reactor core incurs significant
damage. As a result, the U.S. Nuclear Regulatory Commission promulgated regulations requiring that reactor coolant analytical capabilities be upgraded so...
Leaf surface area present on black cottonwood (Populus trichocarpa) and Douglas hawthorn (Crataegus douglasi) was measured indirectly using a point frame, photographs, and a canopy analyzer. Each was compared to directly measured leaf surface area. Six black cottonwood and 3 Douglas hawthorn shrubs were selected in 1996 and 9 black...
The effect of temperature on cattle behavior and distribution was studied in the foothills of California. To accurately understand changes in livestock behavior and distribution, five seasonal trials, each spanning three to four weeks were conducted beginning spring 2004 and ending spring 2005. The two spring trials and the fall...