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: 3724
Phenotypic variation of the Mexican duck (Anas platyrhynchos diazi) in Mexico Phenotypic variation of the Mexican duck (Anas platyrhynchos diazi) in Mexico
A collection of 98 breeding Mexican Ducks (Anas platyrhynchos diazi) was made in Mexico from six areas between the United States border with Chihuahua and Lake Chapala, Jalisco, in order to study geographic variation. Plumage indices showed a relatively smooth clinal change from north to south; northern populations were most influenced by the Northern Mallard (A. p. platyrhynchos)...
Authors
N.J. Scott, R.P. Reynolds
Seed predation due to the yucca moth symbiosis Seed predation due to the yucca moth symbiosis
All species of Yucca (Agavaceae) require the pollinator services of a species of moth in the genus Tegeticula (Lepidoptera: Incurvariidae). These moths oviposit in the ovary of the plants and the larvae are entirely dependent upon Yucca seeds for food. The extent and distribution of larval seed predation was examined in nine Yucca species in the southwestern United States. The proportion...
Authors
Jon E. Keeley, Sterling C. Keeley, C. C. Swift, J. Lee
Reproduction and survival of the desert tortoise (Scaptochelys agassizii) in Ivanpah Valley, California Reproduction and survival of the desert tortoise (Scaptochelys agassizii) in Ivanpah Valley, California
No abstract available.
Authors
F.B. Turner, P.A. Medica, C.L. Lyons
Trimorphodon biscutatus Trimorphodon biscutatus
No abstract available at this time
Authors
N.J. Scott, R.W. McDiarmid
Potential uses of water hyacinths in the Tucson area--an addendum for the Pima County Wastewater Management Department Potential uses of water hyacinths in the Tucson area--an addendum for the Pima County Wastewater Management Department
No abstract available at this time
Authors
P. Warshall, M. Jennings
Crassulacean acid metabolism in Isoetes bolanderi in high elevation oligotrophic lakes Crassulacean acid metabolism in Isoetes bolanderi in high elevation oligotrophic lakes
Isoetes bolanderi dominates the littoral flora of Siesta (elevation 2,440 m) and Ellery (2,905 m) lakes in the Sierra Nevada Range of California, USA. Both lakes are sparsely vegetated and I. bolanderi maintained aboveground oven dry weight of 30–50 m−22 through most of the 1981 summer growing season. Plants at the higher elevation Ellery Lake were half as large as plants at Siesta Lake...
Authors
Jon E. Keeley, C.M. Walker, R.P. Mathews
Crassulacean acid metabolism in the seasonally submerged aquatic Isoetes howellii Crassulacean acid metabolism in the seasonally submerged aquatic Isoetes howellii
Evidence to date is consistent with the hypothesis that the submerged aquatic Isoetes howellii Engelmann possesses crassulacean acid metabolism. Quantitative 14C uptake studies indicate that CO2 assimilation in both the light and dark are functions of pH and total inorganic carbon level. In both the light and dark, maximum uptake rates in 0.6 mM NaHCO3 were double the rates in 0.3 mM...
Authors
Jon E. Keeley
Summary of available population information on California sea otters Summary of available population information on California sea otters
No abstract available at this time
Authors
J. A. Estes, R.J. Jameson
Lack of diurnal acid metabolism in two terrestrial Isoetes species Lack of diurnal acid metabolism in two terrestrial Isoetes species
No abstract available.
Authors
Jon E. Keeley
An annotated check list of the amphibians and reptiles of California An annotated check list of the amphibians and reptiles of California
No abstract available.
Authors
M.R. Jennings
Flocking and predator avoidance in wintering shorebirds Flocking and predator avoidance in wintering shorebirds
No abstract available at this time
Authors
B.E. Kus