Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16782
Multiple-factor influences upon feeding flight rates at wading bird colonies (Alias: Are flight-line counts useful?)
The temporal patterns of feeding, resting, and reproductive behavior in colonial wading birds have been studied by a number of investigators (Recher and Recher 1972, King 1974, Capen 1978, Custer and Osborn 1978, Kushlan 1978) both on a short-term (daily) and long-term (annual) basis. In coastal marine environments, activities at colonies are influenced by tides (Recher and Recher 1972, Krebs 197
Authors
R. Michael Erwin, John C. Ogden
Recovery of breeding success in a population of brown pelicans
Breeding populations of the brown pelican (Pelecanus occidentalis) declined during the 1960's on both east and west coasts of the United States. In 1969, colonies in South Carolina fledged an average of 0.78 young per nest (Blus et al. 1974b), and those in California only 0.004 (Anderson et al. 1975). The minimum production for population stability has been estimated to be 1.0 to 1.2 fledglings p
Authors
Vivian M. Mendenhall, Richard M. Prouty
Effects of mild cold stress on the survival of seawater-adapted mallard ducks (Anas platyrhynchos) maintained on food contaminated with petroleum
(1) Seawater-adapted Mallard ducks maintained in the laboratory will freely consume food that has been contaminated with either any one of a variety of crude oils or a petroleum derivative such as No. 2 fuel oil. (2) During a 100-day experimental period total masses of petroleum equivalent to 50% of the mean body weight were consumed by some birds and many showed no apparent symptoms of distress.
Authors
W.N. Holmes, J. Gorsline, J. Cronshaw
Endocrine correlates of reproduction in the wolf. I. Serum progesterone, estradiol and LH during the estrous cycle
The estrous cycle of 10 intact female wolves, aged 8 months-8 years at the initiation of the study, was characterized in terms of vaginal smears, behavioral observations and serum concentrations of estradiol-17β, progesterone and luteinizing hormone (LH) from January through June. No estrous cycles occurred in these animals between June and December. All were housed with male wolves. Two pups and
Authors
U. S. Seal, E.D. Plotka, J.M. Packard, L. D. Mech
Embryotoxic and teratogenic effects of petroleum hydrocarbons in mallards (Anas platyrhynchos)
Egg surface applications of microliter quantities of crude and refined oils of high aromatic content are embryotoxic to mallards (Anas platyrhynchos) and other avian species; applications of aliphatic hydrocarbons have virtually no effect. Mallard eggs at 72 h of development were exposed to a mixture of aromatic hydrocarbons or to aromatic compounds representative to those present in crude oil to
Authors
D. J. Hoffman
Bone development in black ducks as affected by dietary toxaphene
Black ducks, Anas rubripes, were exposed to dietary toxaphene concentrations of 0, 10, or 50 μg/g of food for 90 days prior to laying and through the reproductive season. Toxaphene did not affect reproduction or survival, but reduced growth and impaired backbone development in ducklings. Collagen, the organic matrix of bone, was decreased significantly in cervical vertebrae of ducklings fed 50 μg/
Authors
P. M. Mehrle, M. T. Finley, J. L. Ludke, F.L. Mayer, T. E. Kaiser
Response of breeding birds to aerial sprays of trichlorfon (Dylox) and carbaryl (Sevin-4-Oil) in Montana forests
Breeding density, food, nesting success, and mortality of 20 bird species were monitored at Beaverhead National Forest, Montana, in 1975 in conjunction with experimental applications of trichlorfon (Dylox) and carbaryl (Sevin-4-oil) to western budworms (Choristoneura occidentalis). Bird species on nine 350- to 550-ha forested plots (three controls and three treated with each pesticide) were studie
Authors
L.R. DeWeese, C. J. Henny, R.L. Floyd, K.A. Bobal, A.W. Schultz
Exposure of waterfowl to lead: A nationwide survey of residues in wing bones of seven species, 1972-73
No abstract available.
Authors
R.C. Stendell, R.I. Smith, K.P. Burnham, R. E. Christensen
The technical literature on the American woodcock, 1927-1978
No abstract available.
Authors
T.J. Dwyer, R.A. Coon, P.H. Geissler