Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16782
Coral snake mimicry: does it occur?
Field observations and experimental evidence refute previous objections to the coral snake mimicry hypothesis. Concordant color pattern variation spanning hundreds of miles and several presumed venemous models strongly suggests that several harmless or mildly venemous colubrid snakes are indeed mimics of highly venemous elapids.
Authors
H.W. Greene, R.W. McDiarmid
Species differences in hematological values of captive cranes, geese, raptors, and quail
Hematological and serum chemical constituents of blood were determined for 12 species, including 7 endangered species, of cranes, geese, raptors, and quail in captivity at the Patuxent Wildlife Research Center. Means, standard deviations, analysis of variance by species and sex, and a series of multiple comparisons of means were derived for each parameter investigated. Differences among some speci
Authors
G.F. Gee, J. W. Carpenter, Gary L. Hensler
Residues of persistent pesticides decreasing
No abstract available.
Authors
J.B. Graves, G.U. Mayfield, J.D. Newsom
The effects of ingested petroleum on the maphthalene-metabolizing properties of the liver tissue in seawater-adapted mallard ducks (Anas platyrhynchos)
Hepatic mixed function oxidase activities were estimated in seawater-adapted mallard ducks (Anas platyrhynchos) that had been consuming food contaminated with one of five different types of crude oil. After 50 days of exposure to contaminated food, enzyme activities of liver microsomal preparations were assessed in terms of their naphthalenemetabolizing properties in vitro. Although dose-dependent
Authors
J. Gorsline, W. N. Holmes, J. Cronshaw
Brain cholinesterase (ChE) activity in nestling starlings: Implications for monitoring exposure of nestling songbirds to ChE inhibitors
No abstract available.
Authors
C. E. Grue, G. V. N. Powell, N.L. Gladson
Acute toxicities of toxaphene and endrin to larvae of seven species of amphibians
Seven species of amphibian larvae were exposed to toxaphene and endrin in a continuous-flow dosing system to determine differences in sensitivity to the two compounds, EC50 and LC50 estimates varied from those for Rana sphenocephala by no more than one order of magnitude when calculated on the basis of intended concentrations. Removal of pesticides from water by the test animals was significant an
Authors
R.J. Hall, D. M. Swineford
Growth of mallards fed phosphamidon for 13-day periods during three different developmental stages
Mallard ducklings (Anas platyrhynchos) were exposed to a 13-day dietary treatment of 0, 0·5 or 5·0 ppm phosphamidon at one of three successive age intervals (5–17 days, 18–30 days, or 31–43 days) during a 10-week growth period. Weekly measurements of body weight, wing length, primary feather length, and bill length revealed slower development of primary feathers in those birds treated from 5 to 17
Authors
S. Haseltine, Gary L. Hensler
Avoidance behavior of young black ducks treated with chromium
Pairs of adult black ducks (Anas rubripes) were fed a diet containing 0, 20, or 200 ppm chromium in the form of chromium potassium sulfate. Ducklings from these pairs were fed the same diets as adults and were tested for their avoidance responses to a fright stimulus. Neither level of chromium had a significant effect on avoidance behavior.
Authors
G. H. Heinz, S. D. Haseltine
Artificial burrows provide new insight into burrowing owl nesting biology
No abstract available.
Authors
C. J. Henny, L. J. Blus
A review of bufflehead sex and age criteria with notes on weights
Summary: Buftleheads Bucephala albeola were collected along the Oregon coast during the hunting season. Birds were first sexed and aged upon cloacal and internal characteristics. Results were then compared with data derived from wing plumage. A small change was made in Carney's (1964) wing plumage key to improve its accuracy. Although only a few studies have been made of Bufflehead weights, i
Authors
C. J. Henny, J.L. Carter, Barbara J. Carter
Low DDT residues in plasma of bald eagles (Haliaeetus leucocephalus) wintering in Colorado and Missouri
No abstract available.
Authors
C. J. Henny, C.R. Griffin, D.W. Stahlecker, A.R. Harmata, E. Cromartie
Pelagic feeding habits of turtles in the eastern Pacific
No abstract available.
Authors
T. H. Fritts