Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16746
Effects of polychlorinated dibenzo-p-dioxins and dibenzofurans on nesting wood ducks (Aix Sponsa) at Bayou Meto, Arkansas Effects of polychlorinated dibenzo-p-dioxins and dibenzofurans on nesting wood ducks (Aix Sponsa) at Bayou Meto, Arkansas
Wood ducks (Aix sponsa) nesting along Bayou Meto downstream from a hazardous waste site in central Arkansas were contaminated with polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs). Residues in eggs, based on 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents (TCDD-EQ), ranged up to 611 parts per trillion (ppt), and egg arithmetic means were 90-fold higher at the site...
Authors
Donald H. White, David J. Hoffman
Texas rat snake (Elaphe obsoleta lindheimeri) eggs and hatchlings from a communal nest Texas rat snake (Elaphe obsoleta lindheimeri) eggs and hatchlings from a communal nest
No abstract available.
Authors
D. R. Clark, G.W. Pendleton
North American migratory bird management issues North American migratory bird management issues
As human population and industry have grown in North America, land-use practices have greatly altered the landscape. As a result of this changed landscape, several migratory bird populations have declined in recent years. For waterbirds, there have been several milestones: the 1986 North American Waterfowl Management Plan (NAWMP) and the 1989 North American Wetlands Conservation Act. As...
Authors
M.H. Wilson, D.A. Ryan
Preliminary raptor surveys in western Mongolia Preliminary raptor surveys in western Mongolia
Raptors were observed on a 5200 km expedition from Ulaan Baatar through the Hangay Mountains to the Russian Altay Mountains with return through the Gobi Altay Mountains. The focus of the expedition was on nesting ecology of the Saker (Falco cherrug) and Altay falcons (F. altaicus) (25 eyries were located), but nests were also found for seven other species including more than 30 nests...
Authors
D. H. Ellis, Merlin H. Ellis, Pu Tsengeg
Forested wetlands constructed for mitigation of destroyed natural wetlands Forested wetlands constructed for mitigation of destroyed natural wetlands
Forested wetlands constructed for mitigation were evaluated at six sites in Maryland to determine the success of these areas for providing suitable wildlife habitat. Natural forested wetlands were used as reference sites. Initial mortality of planted woody shrubs and trees was high (avg. 55%) and mostly attributed to excessive moisture. The number of woody seedlings from natural...
Authors
Matthew C. Perry, S.B. Pugh, A.S. Deller
Net photosynthesis and respiration of sago pondweed (Potamogeton pectinatus) exposed to herbicides Net photosynthesis and respiration of sago pondweed (Potamogeton pectinatus) exposed to herbicides
We determined net photosynthesis and respiration rates for sago pondweed (potamogeton pectinatus) exposed to various concentrations of 11 herbicides widely used in Maryland during the past decade. Net photosynthesis and respiration were determined by measuring changes in the. oxygen content of solutions containing dilutions of technical grade herbicides. At 20-22? C and 58 umol/m2/sec of
Authors
W. James Fleming, M.S. Ailstock, J.J. Momot
Puerto Rican parrots and potential limitations of the metapopulation approach to species conservation Puerto Rican parrots and potential limitations of the metapopulation approach to species conservation
No abstract available.
Authors
M.H. Wilson, C. B. Kepler, N.F.R. Snyder, S.R. Derrickson, F. J. Dein, J. W. Wiley, J.M. Wunderle, A.E. Lugo, D.L. Graham, W.D. Toone
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
Comparative behavior and dietary effects in early life stages of American sturgeons Comparative behavior and dietary effects in early life stages of American sturgeons
No abstract available at this time
Authors
R. M. Ross, R. M. Bennett
Radiocarbon ages of pre-bomb clams and the hard-water effect in Lakes Michigan and Huron Radiocarbon ages of pre-bomb clams and the hard-water effect in Lakes Michigan and Huron
Five radiocarbon ages, all determined by accelerator mass spectrometry, have been obtained for two pre-bomb bivalves from Lake Michigan and one from Lake Huron. After correcting those ages for the fractionation of14C in calcite and for the radioactively inert CO2 in the atmosphere, we find residual ages, caused by the hard water effect, of about 250 years for Lake Michigan and 440 years...
Authors
David K. Rea, Steven M. Colman
Geological mapping of biological habitats on Georges Bank and Stellwaen Bank, Gulf of Maine region Geological mapping of biological habitats on Georges Bank and Stellwaen Bank, Gulf of Maine region
No abstract available.
Authors
Page C. Valentine, Eric A. Schmuck