Publications
Below is a list of WERC's peer-reviewed publications. If you are searching for a specific publication and cannot find it in this list, please contact werc_web@usgs.gov
Filter Total Items: 3780
Spatial use and habitat associations of Columbian white-tailed deer fawns in southwestern Oregon Spatial use and habitat associations of Columbian white-tailed deer fawns in southwestern Oregon
Fawns represent a critical life history stage in the dynamics of deer populations, yet little recent information is available on the ecology of neonatal Columbian white-tailed deer (CWTD), a geographically isolated and federally endangered sub-species. We described home ranges, areas of concentrated use, and habitat associations of CWTD fawns in southwestern Oregon during the summers of...
Authors
M.A. Ricca, R.G. Anthony, Dewaine H. Jackson, S.A. Wolfe
Effects of increased soil nitrogen on the dominance of alien annual plants in the Mojave Desert Effects of increased soil nitrogen on the dominance of alien annual plants in the Mojave Desert
1. Deserts are one of the least invaded ecosystems by plants, possibly due to naturally low levels of soil nitrogen. Increased levels of soil nitrogen caused by atmospheric nitrogen deposition may increase the dominance of invasive alien plants and decrease the diversity of plant communities in desert regions, as it has in other ecosystems. Deserts should be particularly susceptible to...
Authors
Matthew L. Brooks
Individual variation in space use by female spotted hyenas Individual variation in space use by female spotted hyenas
Large carnivores range more widely than many other terrestrial mammals, and this behavior tends to bring them into frequent conflict with humans. Within any carnivore population, individual variation in patterns of space use should be expected to make some animals more vulnerable than others to risks of mortality from humans and other sources. In this study, our goal was to document...
Authors
Erin E. Boydston, Karen M. Kapheim, Micaela Szykman, Kay E. Holekamp
Altered behavior in spotted hyenas associated with increased human activity Altered behavior in spotted hyenas associated with increased human activity
To investigate how anthropogenic activity might affect large carnivores, we studied the behaviour of spotted hyenas (Crocuta crocuta) during two time periods. From 1996 to 1998, we documented the ecological correlates of space utilization patterns exhibited by adult female hyenas defending a territory at the edge of a wildlife reserve in Kenya. Hyenas preferred areas near dense...
Authors
Erin E. Boydston, Karen M. Kapheim, Heather E. Watts, Micaela Szykman, Kay E. Holekamp
Diet of bullfrogs in relation to predation on giant garter snakes at Colusa National Wildlife Refuge Diet of bullfrogs in relation to predation on giant garter snakes at Colusa National Wildlife Refuge
No abstract available.
Authors
G.D. Wylie, Michael L. Casazza, M. Carpenter
Keeping the herds healthy and alert: Implications of predator control for infectious disease Keeping the herds healthy and alert: Implications of predator control for infectious disease
Predator control programmes are generally implemented in an attempt to increase prey population sizes. However, predator removal could prove harmful to prey populations that are regulated primarily by parasitic infections rather than by predation. We develop models for microparasitic and macroparasitic infection that specify the conditions where predator removal will (a) increase the...
Authors
Craig Packer, Robert D. Holt, Peter J. Hudson, Kevin D. Lafferty, Andrew P. Dobson
Use of radio telemetry in studies of shorebirds: past contributions and future directions Use of radio telemetry in studies of shorebirds: past contributions and future directions
No abstract available.
Authors
N. Warnock, John Y. Takekawa
Effects of backpack radiotags on female northern pintails wintering in California Effects of backpack radiotags on female northern pintails wintering in California
To test whether backpack radiotags impacted the wintering biology of northern pintails (Anas acuta), I attached spear-suture (SSU, n=82 in 1993) or harness (HAR, n=337 in 1991-1993) backpack radiotags to female Hatch-Year (HY) and After-Hatch-Year (AHY) pintails after their autumn arrival in California. I evaluated impacts of radiotags on 1) wintering population distribution; 2) flock...
Authors
Joseph P. Fleskes
Selection of flooded agricultural fields and other landscapes by female northern pintails wintering in Tulare Basin, California Selection of flooded agricultural fields and other landscapes by female northern pintails wintering in Tulare Basin, California
Habitat selection and use are measures of relative importance of habitats to wildlife and necessary information for effective wildlife conservation. To measure the relative importance of flooded agricultural fields and other landscapes to northern pintails (Anas acuta) wintering in Tulare Basin (TB), California, we radiotagged female pintails during late August-early October, 1991-1993...
Authors
Joseph P. Fleskes, Robert L. Jarvis, David S. Gilmer
Distribution of female northern pintails in relation to hunting and location of hunted and non-hunted habitats in the Grassland Ecological Area, California Distribution of female northern pintails in relation to hunting and location of hunted and non-hunted habitats in the Grassland Ecological Area, California
No abstract available.
Authors
J. P. Fleskes, D.S. Gilmer, R. L. Jarvis
The use of multi-temporal Landsat Normalized Difference Vegetation Index (NDVI) data for mapping fuels in Yosemite National Park, USA The use of multi-temporal Landsat Normalized Difference Vegetation Index (NDVI) data for mapping fuels in Yosemite National Park, USA
The objective of this study was to test the applicability of using Normalized Difference Vegetation Index (NDVI) values derived from a temporal sequence of six Landsat Thematic Mapper (TM) scenes to map fuel models for Yosemite National Park, USA. An unsupervised classification algorithm was used to define 30 unique spectral-temporal classes of NDVI values. A combination of graphical...
Authors
Jan W. Van Wagtendonk, Ralph R. Root