The spatial and temporal behavior of invasive species spread implies that optimal management strategies involve decisions over space and time. Dispersal and propagule pressure are two primary drivers of the spatial-temporal ecological process of species invasion. In the case of riparian communities, stream flow drives the dispersal of vegetation propagules....
Quarantines and control programs are two policy tools used to prevent and reduce the damages caused by invasive species. Quarantines restrict the movement of material that could spread invasive species. Their requirements impose costs on businesses within the quarantine zone by creating barriers to trade and increasing production costs, which...
Problems with Hall devices for instructional use in undergraduate laboratories stimulated this investigation for development of rugged, easily constructed, inexpensive, electrically reproducible Hall devices with high output voltage. Silicon was chosen as the Hall-plate material on the basis of cost and availability. Advantages and disadvantages of various plate shapes, sizes,...
Point Reyes is a 100-square mile peninsula located on the California coast about 30 miles north of San Francisco. The peninsula, surrounding bays, and neighboring coastal mainland are a unique biodiversity hotspot. The area underwent heavy human use, including ranching and logging, during the late 1800s and early 1900s. Conservation...
This paper examines four community forest enterprises (CFEs) in Oaxaca, Mexico, where CFEs have been held up as a positive example of community forestry that simultaneously addresses both conservation and development goals. CFEs are community-owned businesses that manage their forests to provide income and other benefits and may be considered...
Selenium (Se) is an essential micronutrient of sheep. Supplementation is especially important in young lambs in order to prevent Se-deficiency signs. In the United States, the FDA regulates Se supplementation to ruminant diets at a level of 0.3 mg/kg Se (as fed basis). Questions still exist regarding what chemical form...
The study presents the results of a descriptive analysis of the skeletal remains of 66
individuals recovered from the Fuller and Fanning Mound sites, located on the Yamhill River,
Willamette Valley, Oregon, excavated in 1941-42 by W. T. Edmundson and William S.
Laughlin. The literature and original field notes have...
Even in remote environments, human and natural systems are connected. Pressing environmental and social changes warrant the field of science to not only continue to enhance understanding of the natural world, but also consider the socio-ecological implications of research in the coupled human-natural system. Additionally, a need exists for communication...