Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16784
Forty-fourth breeding bird census. 60. Beech-spruce-hemlock forest
No abstract available.
Authors
Sam Droege, B.R. Noon
Censusing wading bird colonies: An update on the 'flight-line' count method
1. Thirteen mixed-species heronries (10 in Florida, two in Virginia, one in North Carolina) were studied in 1980 as part of a project begun in 1979 aimed at evaluating the 'flight-line' census method..2. Standardized counts of Snowy and Cattle Egrets, Louisiana and Little Blue Herons flying to and from the nesting colony were made for three hr periods, followed by a nest count of the colony. 3.Si
Authors
R.M. Erwin
Weather conditions associated with beginning of northward migration departures of snow geese
No abstract available.
Authors
Edward L. Flickinger
Iatrogenic salt poisoning in captive sandhill cranes
Salt poisoning developed in captive sandhill cranes (Grus canadensis) when sea salt was added to normal drinking water to produce a sodium chloride concentration of 1%. Two of 18 cranes died and 2 were euthanatized when moribund. Muscle weakness, paresis, dyspnea, and depression were observed. Brain and serum sodium, serum uric acid,:and plasma osmolality values were abnormally high. Lesions were
Authors
J. C. Franson, L. Sileo, W. J. Fleming
A continuing search for solutions--wolves and livestock in Minnesota
No abstract available.
Authors
S. H. Fritts
Nationwide residues of organochlorine compounds in wings of adult mallards and black ducks, 1979-80
Organochlorine residues in wings of adult mallards (Anas platyrhynchos) and black ducks (Anas rubripes) were monitored nationwide from birds harvested during the 1979-80 hunting season. DDE residues were found in all samples. DDT residues had declined from levels reported in 1976 on a flyway basis but the decline was significant (P less than 0.05) only in the Pacific Flyway. Levels of DDT, DDE, TD
Authors
B. W. Cain
Effects of DDE and PCB (Aroclor 1260) on experimentally poisoned little brown bats (Myotis lucifugus): Lethal brain concentrations
Adult female little brown bats (Myotis lucifugus) were collected in a church attic in North East, Cecil County, Md. Mealworms (Tenebrio molitor) containing organochlorine pollutants were fed to the bats as follows: 5 bats were dosed at 480 ppm DDE, 12 at 150 ppm DDE, 5 at 1000 ppm polychlorinated biphenyl (PCB; Aroclor 1260), and 12 at 15 ppm PCB. Seven other bats were fed untreated mealworms. The
Authors
D. R. Clark, C. J. Stafford
Recovery of cholinesterase activity in mallard ducklings administered organophosphorus pesticides
Oral doses of the organophosphorus pesticides acephate, dicrotophos, fensulfothion, fonofos, malathion, and parathion were administered to mallard ducklings (Anas platyrhynchos), and brain and plasma cholinesterase (ChE) activities were determined for up to 77 d after dosing. In vivo recovery of brain ChE activity to within 2 standard deviations of the mean activity of undosed birds occurred withi
Authors
W. J. Fleming, S.P. Bradbury
DDE residues in young wood ducks (Aix sponsa) near a former DDT manufacturing plant
Breast muscle DDE residues were as high as 5.8 ppm wet-weight basis and 280 ppm lipid-weight basis in young wood ducks (Aix Sponsa) collected on Wheeler National Wildlife Refuge near a former DDT manufacturing plant in northern Alabama. The average DDE residue in wood ducks collected nearest the plant was 46 times background levels 74 km from the plant.
Authors
W. J. Fleming, E. Cromartie