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: 3622
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
Status of the West Indian manatee in Honduras
Aerial surveys and interviews with fisherman in Honduras indicate that manatee numbers are low. There is an abundance of suitable habitat, and evidence on the proportion of calves indicates that manatees are reproducing. Although natural mortality occurs when the animals are trapped in small landlocked coastal lagoons, the greatest threat to manatees is from subsistence hunting for their meat. Har
Authors
G. B. Rathbun, J. A. Powell, G. Cruz
An annotated check list of the amphibians and reptiles of California
No abstract available.
Authors
M.R. Jennings
Clutch and egg size in the New Guinea chelid turtle Emydura subglobosa
No abstract available.
Authors
J.E. Lovich, S.W. Gotte, C.H. Ernst
The reaction of bighorn sheep to human disturbance in the San Gabriel Mountains, California
No abstract available.
Authors
K.M. Hamilton, S. Holl, C. L. Douglas
Evidence of birth of a sea otter on land in central California
No abstract available.
Authors
R.J. Jameson
Crassulacean acid metabolism in Isoetes bolanderi in high elevation oligotrophic lakes
No abstract available.
Authors
J. E. Keeley, C.M. Walker, R.P. Mathews