Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16743
Waterfowl population trends in the Chesapeake Bay area Waterfowl population trends in the Chesapeake Bay area
No abstract available.
Authors
Matthew C. Perry, A.S. Deller
Glaciological observations of Brúarjökull, Iceland, using synthetic aperture radar and thematic mapper satellite data Glaciological observations of Brúarjökull, Iceland, using synthetic aperture radar and thematic mapper satellite data
The first European Remote Sensing Satellite (ERS-1) synthetic aperture radar (SAR) images offer opportunities for studying glacier surface properties and near-surface features. Analysis of back-scatter values from digital SAR data from 18 January, 7 June, 1 September and 25 October 1993 of Brúarjökull, an outlet glacier on the northeastern margin of the Vatnajökull ice cap, Iceland, that...
Authors
Dorothy K. Hall, Richard S. Williams, Oddur Sigurdsson
The ninety-fifth Christmas bird count. SD MD. Southern Dorchester County, MD The ninety-fifth Christmas bird count. SD MD. Southern Dorchester County, MD
No abstract available.
Authors
C.S. Robbins, E. Martin
The ninety-fifth Christmas Bird Count. OC MD. Ocean City, MD The ninety-fifth Christmas Bird Count. OC MD. Ocean City, MD
No abstract available.
Authors
C.S. Robbins, J.M. Sheppard
Sediment toxicity in Savannah Harbor Sediment toxicity in Savannah Harbor
Savannah Harbor, located near the mouth of the Savannah River, Georgia and South Carolina, is impacted by industrial and municipal effluents. Potential release of contaminants stored in harbor sediments through dredging and shipping operations requires that contaminated areas be identified for proper management of the system and protection of wildlife resources. During 1991, Hyalella...
Authors
P. V. Winger, P. J. Lasier
The reconstruction of Kenilworth Marsh, the last tidal marsh in Washington, D.C. The reconstruction of Kenilworth Marsh, the last tidal marsh in Washington, D.C.
No abstract available.
Authors
S.W. Syphax, R.S. Hammerschlag
Acephate affects migratory orientation of the white-throated sparrow (Zonotrichia albicollis) Acephate affects migratory orientation of the white-throated sparrow (Zonotrichia albicollis)
Migratory white-throated sparrows (Zonotrichia albicollis) were exposed to acephate (acetylphosphoramidothioic acid O, S-dimethyl ester), an organophosphorus pesticide, to determine its effects on migratory orientation and behavior. Birds were also exposed to polarizer sheets to determine the mechanism by which acephate may affect migratory orientation. Adult birds exposed to 256 ppm...
Authors
N.B. Vyas, E. F. Hill, J.R. Sauer, Wayne J. Kuenzel
Application of brain cholinesterase reactivation to differentiate between organophosphorus and carbamate pesticide exposure in wild birds Application of brain cholinesterase reactivation to differentiate between organophosphorus and carbamate pesticide exposure in wild birds
Brain cholinesterase activity was measured to evaluate pesticide exposure in wild birds. Thermal reactivation of brain cholinesterase was used to differentiate between carbamate and organophosphorus pesticide exposure. Brain cholinesterase activity was compared with gas chromatography and mass spectrometry of stomach contents. Pesticides were identified and confirmed in 86 of 102...
Authors
W. R. Smith, N. J. Thomas, C. Hulse
Quantitative assessment of pair formation behavior in captive whooping cranes (Grus americana) Quantitative assessment of pair formation behavior in captive whooping cranes (Grus americana)
Instantaneous scan sampling for mean distance and synchronous action patterns and all-occurrence sampling for unison call, dance, strut, and hoover-up behaviors were conducted for five potential whooping crane pairs at Patuxent Environmental Science Center, Laurel. Maryland. Dance, strut, and hoover-up differed among pairs, as did total frequency of social behaviors. It was unclear...
Authors
J.T. Nelson, C.R. Small, D. H. Ellis
Remote monitoring of parental incubation conditions in the greater sandhill crane Remote monitoring of parental incubation conditions in the greater sandhill crane
To monitor incubation conditions in nests of greater sandhill cranes, a radiotransmitting egg was built using six temperature sensors, a position sensor, and a light sensor. Sensor readings were received, along with time of observations, and stored in a computer. The egg was used to monitor incubation in nests of six pairs of cranes during 1987 and 1988. Ambient temperature was also...
Authors
G.F. Gee, J. Hatfield, P.J. Howey
Assessing ground-based counts of nestling bald eagles in northeastern Minnesota Assessing ground-based counts of nestling bald eagles in northeastern Minnesota
We present evidence that the bald eagle (Haliaeetus leucocephalus) productivity survey in the Boundary Waters Canoe Area Wilderness of northeastern Minnesota may have underestimated the number of nestlings during 1986-1988. Recommendations are provided to achieve more accurate ground-based counts. By conducting ground-based observations for up to 1 hour/nest, an accurate count of the...
Authors
M.R. Fuller, Jeff S. Hatfield, E. L. Lindquist
Distribution and abundance of Emoia slevini (Scincidae) in the Mariana Islands Distribution and abundance of Emoia slevini (Scincidae) in the Mariana Islands
No abstract available.
Authors
M. J. McCoid, G.H. Rodda, T. H. Fritts