Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16731
Pellets versus feces: their relative importance describing the food habits of double-crested cormorants Pellets versus feces: their relative importance describing the food habits of double-crested cormorants
We compared the amount of taxonomically identifiable (diagnostic) fish remains in double-crested cormorant (Phalacrocorax auritus) feces to that exiting the birds via regurgitated pellets. Feces and pellets were collected concurrently during June 1994 from cormorant colonies on Little Galloo Island, eastern Lake Ontario. About 90% of the diagnostic fish remains were found in pellets and...
Authors
J. H. Johnson, R. M. Ross
Water Resources Data, Virginia, Water Year 1995; Volume 2. Ground-Water-Level and Ground-Water-Quality Records Water Resources Data, Virginia, Water Year 1995; Volume 2. Ground-Water-Level and Ground-Water-Quality Records
No abstract available.
Authors
Water Resources Division U.S. Geological Survey
Water-quality assessment of the lower Susquehanna River basin, Pennsylvania and Maryland: Environmental setting Water-quality assessment of the lower Susquehanna River basin, Pennsylvania and Maryland: Environmental setting
No abstract available
Authors
Dennis W. Risser, Steven F. Siwiec
Flood magnitude and frequency of Main Ditch at the culvert on New Jersey Route 44 and at the Conrail culvert downstream, West Deptford Township, Gloucester County, New Jersey Flood magnitude and frequency of Main Ditch at the culvert on New Jersey Route 44 and at the Conrail culvert downstream, West Deptford Township, Gloucester County, New Jersey
The magnitude and frequency of floods at Main Ditch at the culvert on New Jersey Route 44 at milepost 8.3 and at the Conrail culvert 0.21 miles downstream, in West Deptford Township, New Jersey, were determined by using the New Jersey Department of Environmental Protection Special Report 38 method. Flood-magnitude and -frequency estimates, as well as drainage-basin characteristics, are...
Authors
Thomas Barringer
Flood magnitude and frequency of Monongahela Brook at the culvert on New Jersey Route 41, Deptford Township, Gloucester County, New Jersey Flood magnitude and frequency of Monongahela Brook at the culvert on New Jersey Route 41, Deptford Township, Gloucester County, New Jersey
Flood magnitude and frequency of Monongahela Brook in Deptford Township, Gloucester County, New Jersey, were determined by using the rational method. Flood-magnitude and -frequency estimates, as well as drainage-basin characteristics, are included in this report. The 100-year-flood estimate is 80 cubic feet per second.
Authors
Thomas Barringer
Effects of Silv-Ex? on terrestrial wildlife Effects of Silv-Ex? on terrestrial wildlife
No abstract available.
Authors
N.B. Vyas, J. W. Spann, E. F. Hill
Ultrastructure of the haemocytes of Ixodes scapularis (Acari: Ixodidae) Ultrastructure of the haemocytes of Ixodes scapularis (Acari: Ixodidae)
Haemocytes of Ixodes scapularis were characterized on the basis of their ultrastructure by transmission electron microscopy of thin sections. Three types of haemocytes were identified: prohaemocytes, plasmatocytes, and granulocytes. Prohaemocytes are undifferentiated cells containing very little cytoplasm (high nucelo-cytoplasmic ratio). Plasmatocytes are rich in free ribosomes...
Authors
E. Zhioua, R.A. LeBrun, P.W. Johnson, H. S. Ginsberg
Review of factors affecting the distribution and abundance of waterfowl in shallow-water habitats of Chesapeake Bay Review of factors affecting the distribution and abundance of waterfowl in shallow-water habitats of Chesapeake Bay
Long-term trends of waterfowl populations in Chesapeake Bay demonstrate the importance of shallow-water habitats for waterfowl species. Although recent increases in field feeding by geese and swans lessened the importance of shallow-water areas for these species, most duck species depend almost exclusively on shallow-water habitats. Many factors influenced the distribution and abundance...
Authors
Matthew C. Perry, A.S. Deller
Nutritional value of winter foods for whooping cranes Nutritional value of winter foods for whooping cranes
We measured metabolizable energy and digestibility of Whooping Crane (Grus americana) winter foods (blue crab [Callinectes sapidus]), common Rangia clam (Rangia cuneata), wolfberry fruit (Lycium carolinianurn [wolfberry]), and live oak acorn (Ouercus virginiana [acorn])] with feeding trials to captive-reared Whooping Cranes. Apparent metabolizable energy coefficients (expressed as %)...
Authors
J.T. Nelson, R.D. Slack, G.F. Gee
Leave no trace outdoor skills and ethics: An educational solution for reducing visitor impacts Leave no trace outdoor skills and ethics: An educational solution for reducing visitor impacts
No abstract available.
Authors
J. L. Marion, S.C. Brame
Recreation management in natural areas: Problems and practices, status and trends Recreation management in natural areas: Problems and practices, status and trends
No abstract available.
Authors
R.E. Manning, N.L. Ballinger, J. L. Marion
Migratory bird hunting: Amended test protocol for nontoxic shot approval procedures for shot and shot coatings Migratory bird hunting: Amended test protocol for nontoxic shot approval procedures for shot and shot coatings
No abstract available.
Authors
K.A. Morehouse, Barnett A. Rattner