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: 3617
Hydrogen, oxygen and carbon isotope ratios of cellulose from submerged aquatic Crassulacean Acid Metabolism and non-Crassulacean Acid Metabolism plants
No abstract available.
Authors
L. Sternberg, M. J. DeNiro, J. E. Keeley
Breeding biology of Pacific white-fronted geese
Nesting ecology of Pacific white-fronted geese (Anser albifrons frontalis) was studied on a 9.9-km2 area on the Yukon-Kuskokwim (Y-K) Delta, Alaska, during 1977-79. Availability of nesting habitat varied considerably among years because of differences in time of snow- and icemelt. Mean clutch size was 3.7 eggs in the late spring thaw year and 5.2 and 5.7 eggs in early snowmelt years. Peak (and dur
Authors
Craig R. Ely, Dennis G. Raveling
Early behavioral development of the sea otter, Enhydra lutris
No abstract available.
Authors
S.F. Payne, R.J. Jameson
Summary of available population information on California sea otters
No abstract available at this time
Authors
J. A. Estes, R.J. Jameson
Light/dark control of diurnal acid metabolism in the submerged aquatic Isoetes howellii
No abstract available.
Authors
J. E. Keeley
Crassulacean acid metabolism in the seasonally submerged aquatic Isoetes howellii
No abstract available.
Authors
J. E. Keeley
Temporal patterns of seed use and availability in a guild of desert ants
1Temporal patterns of seed use were studied from late winter to autumn in three species of seed-harvesting ants in the Sonoran Desert. Measures of effective foraging activity, dietary niche breadth and dietary niche overlaps were obtained each month and were tested for correlation with estimates of the available seed resource.2Seeds were the only numerically important type of food in the diets of
Authors
Patricia Mehlhop, Norman J. Scott
First nests of Heermann's Gull in the United States
No abstract available.
Authors
J. A. Howell, D. Laclerque, S. Paris, W. Boarman, A. DeGange, L. Binford
Foraging dives by post-breeding northern pintails
Dabbling ducks (Anatini), including Northern Pintails (Anas acuta), typically feed by “tipping-up” (Bellrose, Ducks, Geese, and Swans of North America, Stackpole Books, Harrisburg, Pennsylvania, 1976) in shallow water. Pintails are not as adapted for diving as members of Aythyini or Oxyurini (Catlett and Johnston, Comp. Biochem. Physiol. 47A:925-931, 1974); however, incidents of foraging dives by
Authors
Michael R. Miller
Report of diurnal acid metabolism in two aquatic Australian species of Isoetes
Previous studies have demonstrated the presence of crassulacean acid metabolism in the North American submerged aquatic Isoetes howellii (Isoetaceae). Diurnal changes in titratable acidity and malic acid levels indicate the presence of this pathway in two Australian species of Isoetes.
Authors
Jon E. Keeley
Lack of diurnal acid metabolism in two terrestrial Isoetes species
No abstract available.
Authors
J. E. Keeley