Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16731
Use of multi-date Landsat TM imagery to map Eastern hemlock (Tsuga canadensis) decline due to hemlock woolly adelgid (Adelges tsugae) in Shenandoah National Park Use of multi-date Landsat TM imagery to map Eastern hemlock (Tsuga canadensis) decline due to hemlock woolly adelgid (Adelges tsugae) in Shenandoah National Park
No abstract available.
Authors
David D. Morton, John A. Young, Nissa M. Thomsen
Controls on soil respiration: implications for climate change Controls on soil respiration: implications for climate change
No abstract available.
Authors
Lindsey E. Rustad, Thomas G. Huntington, Richard D. Boone
Volumetric evolution of Surtsey, Iceland, from topographic maps and scanning airborne laser altimetry Volumetric evolution of Surtsey, Iceland, from topographic maps and scanning airborne laser altimetry
The volumetric evolution of Surtsey has been estimated on the basis of digital elevation models derived from NASA scanning airborne laser altimeter surveys (20 July 1998), as well as digitized 1:5,000-scale topographic maps produced by the National Land Survey of Iceland and by Norrman. Subaerial volumes have been computed from co-registered digital elevation models (DEM's) from 6 July...
Authors
J.B. Garvin, R.S. Williams, J.J. Frawley, W.B. Krabill
Water resources management plan: Cold Harbor and Gaines' Mill units, Richmond National Battlefield Park, Virginia Water resources management plan: Cold Harbor and Gaines' Mill units, Richmond National Battlefield Park, Virginia
No abstract available.
Authors
Karen C. Rice, David Vana-Miller, Mark D. Flora
Hydrologic budget of the late Oligocene Lake Creede and the evolution of the upper Rio Grande drainage system Hydrologic budget of the late Oligocene Lake Creede and the evolution of the upper Rio Grande drainage system
The filling history, hydrologic budget, and geomorphic development of ancient Lake Creede and its tributary basin are evaluated to determine the factors that controlled its character. The lake filled the Creede caldera that formed in the late Oligocene as a consequence of the eruption of the Snowshoe Mountain Tuff. The caldera's sedimentary fill accumlated to a depth of about 1.26 km and...
Authors
Paul B. Barton, Thomas A. Steven, Daniel O. Hayba
Relationship of Eastern hemlock (Tsuga canadensis) to the ecology of small streams in Delaware Water Gap National Recreation Area Relationship of Eastern hemlock (Tsuga canadensis) to the ecology of small streams in Delaware Water Gap National Recreation Area
Hemlock ravines in Delaware Water Gap National Recreation Area (DEWA) are highly valued because of their distinctive aesthetic, recreational and ecological qualities. We conducted a comparative study designed to determine the potential long-term consequences to aquatic communities of the suspected transition from hemlock-dominated forests to mixed hardwood forests as a result of hemlock...
Authors
David P. Lemarie, John A. Young, Craig D. Snyder, Robert M. Ross, David Smith, Randy M. Bennett
Phosphate sorption by base metal hydroxides generated in the neutralization of acid mine drainage Phosphate sorption by base metal hydroxides generated in the neutralization of acid mine drainage
No abstract available at this time
Authors
P.L. Sibrell, P.R. Adler
Patterns of colony-site use and disuse in saltmarsh-nesting Common and Roseate terns Patterns of colony-site use and disuse in saltmarsh-nesting Common and Roseate terns
Nearly all previous studies of saltmarsh-nesting Common Terns on the east coast of the United States have concluded that tidal saltmarshes were suboptimal or marginal breeding habitats. Questioning that conclusion, we analyzed patterns of both saltmarsh and nonmarsh colony use (stability, movement, establishment, abandonment, and size) obtained during 5 yr of annual helicopter censuses...
Authors
P. A. Buckley, F. G. Buckley
Geographic analysis of species richness and community attributes of forest birds from survey data in the mid-Atlantic integrated assessment region Geographic analysis of species richness and community attributes of forest birds from survey data in the mid-Atlantic integrated assessment region
Species richness of local communities is a state variable commonly used in community ecology and conservation biology. Investigation of spatial and temporal variations in richness and identification of factors associated with these variations form a basis for specifying management plans, evaluating these plans, and for testing hypotheses of theoretical interest. However, estimation of...
Authors
Emmanuelle Cam, John R. Sauer, James D. Nichols, James E. Hines, Curtis H. Flather
Relative species richness and community completeness: avian communities and urbanization in the mid-Atlantic states Relative species richness and community completeness: avian communities and urbanization in the mid-Atlantic states
The idea that local factors govern local richness has been dominant for years, but recent theoretical and empirical studies have stressed the influence of regional factors on local richness. Fewer species at a site could reflect not only the influence of local factors, but also a smaller regional pool. The possible dependency of local richness on the regional pool should be taken into...
Authors
E. Cam, J.D. Nichols, J.R. Sauer, J.E. Hines, C.H. Flather
Organochlorine and metal contaminant exposure and effects in hatching Black-Crowned Night Herons (Nycticorax nycticorax) in Delaware Bay Organochlorine and metal contaminant exposure and effects in hatching Black-Crowned Night Herons (Nycticorax nycticorax) in Delaware Bay
Pea Patch Island in Delaware Bay is the site of the largest heronry north of Florida. From 1989–93, the population of nine species of wading birds numbered approximately 12,000 pairs, but has recently declined to about 7,000 pairs. Because Delaware Bay is a major shipping channel and receives anthropogenic releases of toxic substances from agricultural, industrial, and municipal point...
Authors
Barnett A. Rattner, D. J. Hoffman, M. J. Melancon, Glenn H. Olsen, S.R. Schmidt, K.C. Parsons
Contaminant exposure and effects: Terrestrial vertebrates database: Trends and data gaps for Atlantic Coast estuaries Contaminant exposure and effects: Terrestrial vertebrates database: Trends and data gaps for Atlantic Coast estuaries
In order to examine the condition of biota in Atlantic coast estuaries, "Contaminant Exposure and Effects—Terrestrial Vertebrates" database (CEE-TV) has been compiled through computerized search of published literature, review of existing databases, and solicitation of unpublished reports from conservation agencies, private groups, and universities. Summary information has been entered...
Authors
Barnett A. Rattner, J.L. Pearson, N. H. Golden, J.B. Cohen, R.M. Erwin, M. A. Ottinger