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: 3743
Selected vertebrate endangered species of the sea coast of the United States - southern sea otter Selected vertebrate endangered species of the sea coast of the United States - southern sea otter
No abstract available at this time
Authors
R.J. Jameson, B. Csuiti
Travel time variation on backcountry trails Travel time variation on backcountry trails
Numerous interrelated factors influence the travel times of hikers and riders on backcountry trails. This study sought to quantify those factors which were thought to be most important in affecting trail speeds. The travel times of 897 backpacking parties, 634 day hiking parties, and 111 riding parties were obtained from gentle (0.75%), moderate (5.0%), and steep (12.5%) trail segments...
Authors
J. W. van Wagtendonk, J.M. Benedict
Undersea topography and distribution of dolphins of the genus Delphinus in the Southern California Bight Undersea topography and distribution of dolphins of the genus Delphinus in the Southern California Bight
Aerial surveys totalling 21,902 km were analyzed in the Southern California Bight. Although the genus Delphinus is easily recognizable from aircraft, the different species are not detectable in these flights. Delphinus occur more frequently in areas of high relief than in areas of low relief. The depth of the water does not appear to influence distribution of Delphinus. The availability...
Authors
Clifford A. Hui
Alcoholic fermentation in swamp and upland populations of Nyssa sylvatica: Temporal changes in adaptive strategy Alcoholic fermentation in swamp and upland populations of Nyssa sylvatica: Temporal changes in adaptive strategy
Both the upland and swamp varieties of Nyssa sylvatica respond initially to flooding with an acceleration of ethanol production. Under continued flooding the roots of the upland variety sylvatica have decreased rates of ethanol production, very likely a result of the progressively worsening necrosis of the root system. Few of these plants survive a full year of flooding. The swamp...
Authors
Jon E. Keeley, E. H. Franz
Procedures for visually estimating bird damage to grapes Procedures for visually estimating bird damage to grapes
No abstract available at this time
Authors
R. W. DeHaven, R. L. Hothem
Population differentiation along a flood frequency gradient: Physiological adaptations to flooding in Nyssa sylvatica Population differentiation along a flood frequency gradient: Physiological adaptations to flooding in Nyssa sylvatica
Throughout the southeastern United States the hardwood Nyssa sylvatica (sensu lato) is distributed along a soil moisture gradient from upland sites, which are never flooded, to floodplains, which are periodically flooded and drained to permanently flooded swamps. Population differentiation with respect to flood tolerance and related physiological attributes was investigated using 1—year...
Authors
Jon E. Keeley
An evaluation of the river die-away biodegradation test An evaluation of the river die-away biodegradation test
No abstract available at this time
Authors
G.D. Wylie
Quantitative variation and the ecological role of vulpinic acid and atranorin in thallus of Letharia vulpina Quantitative variation and the ecological role of vulpinic acid and atranorin in thallus of Letharia vulpina
High pressure liquid chromatography was used to determine concentrations of vulpinic acid and atranorin in the thaullus of Letharia vulpina. Vulpinic acid concentration is lowest in the old basal branches of the thallus and increases toward the young branch tips, whereas the reverse is true for atranorin. The suggested role of vulpinic acid as an anti-herbivore defense compound is...
Authors
Nathan L. Stephenson, Philip W. Rundel
Desert bighorn sheep of the River Mountains, Nevada Desert bighorn sheep of the River Mountains, Nevada
No abstract available at this time
Authors
D.M. Leslie, C. L. Douglas
Exploitation of marine mammals: r-selection of K-strategists? Exploitation of marine mammals: r-selection of K-strategists?
The importance of marine mammals as predators to the organization of marine communities is poorly known, although in several structurally analogous systems the ecological and evolutionary roles of predators are known to be of considerable importance. Occupation of the marine environment by mammals probably carried physiological constraints for single-young pregnancies thereby limiting...
Authors
J. A. Estes
Desert bighorn sheep of the River Mountains, Nevada Desert bighorn sheep of the River Mountains, Nevada
No abstract available at this time
Authors
David M. Leslie, C. L. Douglas