Publications
This is a list of publications written by Patuxent employees since Patuxent opened in 1939. To search for Patuxent's publications by author or title, please click below to go to the USGS Publication Warehouse.
Filter Total Items: 8128
Food use and nutrition of black ducks nesting in Maine Food use and nutrition of black ducks nesting in Maine
Based on 32 adult black ducks (Anas rubripes) collected during the nesting seasons of 1974-76, the proportion of macro invertebrates (as aggregate [average] percent of dry weight) in the diet of males, egg-laying females, and postlaying females was 60, 75, and 55%, respectivey. Sample sizes were small, and the differences associated with sex and reproductive condition were not signficant...
Authors
Kenneth J. Reinecke, Ray B. Owen
Weathered petroleum: Effects on mallard egg hatchability Weathered petroleum: Effects on mallard egg hatchability
No abstract available.
Authors
Robert C. Szaro, Nancy C. Coon, William C. Stout
Secondary poisoning of barn owls with famphur, an organophosphate insecticide Secondary poisoning of barn owls with famphur, an organophosphate insecticide
No abstract available.
Authors
Elwood F. Hill, Vivian M. Mendenhall
On the variability of alligator sex ratios On the variability of alligator sex ratios
Samples of alligators from wild and 'farm' populations exhibited disproportionate sex ratios. Males predominated among young alligators from wild populations, whereas females were much more abundant than males in the farm population, where resources were superabundant. These results and other considerations lead us to hypothesize that environmental factors influence sex determination in
Authors
James D. Nichols, R. H. Chabreck
Dieldrin and heptachlor residues in dead gray bats, Franklin County, Missouri--1976 versus 1977 Dieldrin and heptachlor residues in dead gray bats, Franklin County, Missouri--1976 versus 1977
Lethal dieldrin concentrations were found in the brains of dead gray bats (Myotis grisescens) collected during 1976 and 1977 beneath a maternity roost in a Missouri cave. In addition, residues of heptachlor epoxide, oxychlordane, cis-chlordane, and trans-nonachlor increased significantly in both brains and carcasses of bats collected during 1977. These increases appear to reflect a...
Authors
D. R. Clark, R. K. LaVal, A. J. Krynitsky
Transfer of crude oil from contaminated water to bird eggs Transfer of crude oil from contaminated water to bird eggs
Paris of breeding mallard ducks were exposed to oiled water for 2 days during the first week of incubation. Hatching success of ducks exposed to 100 ml of Prudhoe Bay crude oil per square meter of water surface was significantly less than that of controls. Hatching success of ducks exposed to 5 ml of crude oil per square meter of water surface was less than that of controls but the...
Authors
P.H. Albers
Pollution ecology of breeding great blue herons in the Columbia Basin, Oregon and Washington Pollution ecology of breeding great blue herons in the Columbia Basin, Oregon and Washington
Approximately 40 pairs of Great Blue Herons (Ardea herodias) formerly nested in trees on or near Blalock Island about 95 km downstream from Richland, Washington, in the Columbia River (Nehls 1972 ). In conjunction with construction of the John Day Lock and Dam and before creating Lake Umatilla in 1968, large trees along the shoreline, including those in the heronry on Blalock Island...
Authors
L. J. Blus, Charles J. Henny, T. E. Kaiser
Dietary exposure of kestrels to lead Dietary exposure of kestrels to lead
No abstract available.
Authors
Rey C. Stendell
Ecology of a Maryland population of black rat snakes (Elaphe o. obsoleta) Ecology of a Maryland population of black rat snakes (Elaphe o. obsoleta)
Behavior, growth and age of black rat snakes under natural conditions were investigated by mark-recapture methods at the Patuxent Wildlife Research Center for 22 years (1942-1963), with limited observations for 13 more years (1964-1976). Over the 35-year period, 330 snakes were recorded a total of 704 times. Individual home ranges remained stable for many years; male ranges averaged at...
Authors
Lucille F. Stickel, William H. Stickel, F. C. Schmid
The California condor in Baja California, Mexico The California condor in Baja California, Mexico
No abstract available.
Authors
S.R. Wilbur, L.F. Kiff
Age, sex, reproduction, and spatial organization of lynxes colonizing northeastern Minnesota Age, sex, reproduction, and spatial organization of lynxes colonizing northeastern Minnesota
From 1972 through 1978, lynxes (Felis lynx) emigrating from Canada were studied in northeastern Minnesota. Fourteen individuals were radio-tracked, 8 were ear-tagged, and 49 carcasses were examined. Sex ratios of the samples were equal during the first years of the study, but females predominated later. At least half of the radio-tagged lynxes were killed by humans; no natural mortality...
Authors
L.D. Mech
Inferences regarding survival and recovery rates of winter-banded canvasbacks Inferences regarding survival and recovery rates of winter-banded canvasbacks
Banding and recovery data from 3 populations of winter-banded canvasbacks (Aythya valisineria) were analyzed and survival and recovery rates were estimated. Sex-specific differences in these rates were detected in some populations, and lower survival rates were exhibited by females. Some geographic variation in survival rates was evident, suggesting that canvasbacks should not be managed...
Authors
James D. Nichols, G.Michael Haramis