Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16783
Of mice and mallards: tests of the compensatory mortality hypothesis in vertebrate populations
No abstract available.
Authors
J. D. Nichols, J. E. Hines
Inorganic and organic mercury chloride toxicity to Coturnix: Sensitivity related to age and quantal assessment of physiologic responses
The toxicities of mercuric chloride (HgCl(,2)) and methylmercuric chloride (CH(,3)HgCl) were compared for coturnix (Coturnix coturnix japonica) from hatching to adulthood. Comparisons were based on: (1) Median lethal dosages (LD50) derived by administering single peroral and single intramuscular dosages of mercury, (2) median lethal concentrations (LC50) derived by feeding mercury for 5 days, (3)
Authors
E. F. Hill
Estimating reproductive success in colonial waterbirds: An evaluation
To estimate reproductive success in a population one ideally would like to determine the number of young fledged per nesting female. However, this is difficult because often (1) the adults are not individually marked, (2) the colony is not visited daily, and (3) the investigator is unable to monitor all young until they fledge. If adults are unmarked and successful renesting occurs, reproductive
Authors
R.M. Erwin, T. W. Custer
Observer variability in estimating numbers: An experiment
Census estimates of bird populations provide an essential framework for a host of research and management questions. However, with some exceptions, the reliability of numerical estimates and the factors influencing them have received insufficient attention. Independent of the problems associated with habitat type, weather conditions, cryptic coloration, ete., estimates may vary widely due only t
Authors
R.M. Erwin
Isolation of hydrocarbon residues from sediment by steam distillation
No abstract available.
Authors
A. A. Belisle, M. L. Gay
Effects of a chemical dispersant and crude oil on breeding ducks
Effects of chemically dispersed crude oil on mallard reproduction. Incubating female mallards were exposed to a water source treated with either Prudhoe Bay crude oil, Corexit 9527, or a combination of oil and dispersant during the first 10 da of development. Used thermocouple probes to monitor incubation temperature. Measured hatching success, incubation temperature, and survival of ducklings t
Authors
P.H. Albers, M. L. Gay
Patuxent's eagle breeding: An update in the 200th year of the Nation's symbol
No abstract available.
Authors
J. W. Carpenter
Further interpretation of the relation of organochlorine residues in brown pelican eggs to reproductive success
This study was conducted to provide additional interpretation of the relation of organochlorine pollutants to reproductive success and population stability of brown pelicans Pelecanus occidentalis in the southeastern United States from 1969 to 1977. The sample egg technique was employed in South Carolina; it involved collecting an egg from each of 156 marked nests, analysing the eggs for residues
Authors
L. J. Blus
Organophosphate inhibition of avian salt gland Na, K-ATPase activity
1. Adult black ducks (Anas rubripes) were given freshwater or saltwater (1.5% NaCl) for 11 days and half of each group was also given an organophosphate (17 p.p.m. fenthion) in the diet on days 6–11.2. After 11 days, ducks drinking saltrwater had lost more weight and had higher plasma Na and uric acid concentration and osmolalities than birds drinking freshwater.3. Saltwater treatment stimulated t
Authors
W. C. Eastin, W. J. Fleming, H. C. Murray
Nesting by one-year-old black-crowned night herons on Hope Island, Rhode Island
There have been few consistent reports concerning the frequency and success of nesting attempts by immature night herons of the genus Nycticorax. One- year-old Black-crowned Night Herons (Nycticorax nycticorax) mated to 2-yr-old or older birds built nests and incubated eggs in the wild (Gross 1923). In a captive colony, many 1-yr-old pairs of night herons courted and built nests, and one pair succ
Authors
Thomas W. Custer, William E. Davis
Effects of dispersant and crude oil ingestion on mallard ducklings (Anas platyrhynchos)
No abstract available.
Authors
W. C. Eastin, Barnett A. Rattner
Occurrence of the Japanese bush-warbler on Maui
No abstract available.
Authors
J.H. Carothers, R.B. Hansen