Publications
This list of publications includes peer-review journal articles, official USGS publications series, reports and more authored by scientists in the Ecosystems Mission Area. A database of all USGS publications, with advanced search features, can be accessed at the USGS Publications Warehouse.
Filter Total Items: 41772
Fortieth breeding bird census. 170. Selectively logged mature tulip-tree oak forest
No abstract available.
Authors
B. Whitcomb, D. Bystrak, R. Whitcomb
The seventy-seventh Audubon Christmas bird count, introduction: North Carolina, South Carolina, Georgia, Florida
No abstract available.
Authors
P.W. Sykes
Fortieth breeding bird census. 169. Mature tulip-tree - oak forest
No abstract available.
Authors
B. Whitcomb, D. Bystrak, R. Whitcomb
A comparison of 2 techniques for estimating deer density
We applied mark-resight and area-conversion methods to estimate deer abundance at a 2,862-ha area in and surrounding the Gettysburg National Military Park and Eisenhower National Historic Site during 1987-1991. One observer in each of 11 compartments counted marked and unmarked deer during 65-75 minutes at dusk during 3 counts in each of April and November. Use of radio-collars and vinyl collars p
Authors
G.L. Storm, D.F. Cottam, R.H. Yahner, J. D. Nichols
Prolonged retention of methyl mercury by mallard drakes
Mallard drakes accumulated mercury rapidly from dietary dosage of methylmercury dicyandiamide and eliminated it slowly, retaining approximately one half at the end of 84 days; no measurable loss occurred between the end of the 7th and 56th days, but loss resumed concurrently with new feather growth, and continued through the 112th day, the close of the study.
Authors
L. F. Stickel, W. H. Stickel, M. A. R. McLane, M. Bruns
Residues of environmental pollutants and shell thinning in merganser eggs
Clutches of merganser eggs were collected in 1973 and 1975 to determine whether levels of organochlorines and mercury might be responsible for possible population declines and to compare eggshell measurements with those of early museum collections. One egg per clutch was selected randomly for chemical analysis. Overall, residues of DDE, PCB?s, and mercury were low in Hooded Merganser eggs; localit
Authors
D. H. White, E. Cromartie
Waterfowl exposure to lead and steel shot on selected hunting areas
Gizzards and wingbones from immature mallards (Anas platyrhynchos), pintails (Anas acuta), black ducks (A. rubripes), and Canada geese (Branta canadensis) were collected from 12 national and stat hunting are.as during the hunting season of 1974-75. The gizzards were examined for the occurrence of lead and steel shot and the wingbones were analyzed for lead residues. Incidence of lead shot in gi
Authors
D. H. White, R.C. Stendell
Brain cholinesterase activities of birds from forests sprayed with trichlorfon (Dylox) and carbaryl (Sevin-4-oil)
Brain cholinesterase activities were determined in birds from forests sprayed with Dylox2 at 1.13 kg/hectare (1 1b/acre — active ingredient [a.i.]) or Sevin-4-oil2 at 1.13 kg/hectare (1 1b/acre — a.i.) for up to 5 days postspray. Of ten bird species evaluated from the Dylox spray area, four species represented by six individuals had values which were depressed more than 2 standard deviations below
Authors
J.G. Zinkl, C. J. Henny, L.R. DeWeese
Propagation and management of endangered species at the Patuxent Wildlife Research Center
No abstract available.
Authors
J. W. Carpenter
Recent observations on the birds of the Koolau Forest Reserve, Maui
No abstract available.
Authors
J. M. Scott, J.L. Sincock