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: 41756
Barbed wire that grows
A many-flowered rose makes an ideal, living fence for farm and pasture lands.
Authors
D.L. Allen
Development of an index number for expressing degrees of repellent activity
No abstract available.
Authors
E. Bellack, J.B. DeWitt
Muskrat investigations on the Blackwater National Wildlife Refuge, Maryland, 1941-1945
1. Approximately 5,233 acres of tidal marsh on the Blackwater National Wildlife Refuge in Maryland were trapped by Fish and Wildlife Service personnel from 1941-1945, with the closely controlled operations yielding 23,539 muskrats; 13,421 (57 per cent) were males and 10,090 (43 per cent) were females, a sex ratio of 133: 100. This preponderance of males was consistently maintained throughout the e
Authors
H.L. Dozier, M.H. Markely, L. M. Llewellyn
Comparison of methods for the determination of carotene
Replicate samples of dehydrated :alfalfa-leaf meal were assayed for carotene content by four different analytical procedures. The results obtained by the modified A.O.A.C.method were significantly higher than those obtained by the other procedures.
Authors
J.V. Derby, J.B. DeWitt
Notes on two species of Calliphoridae (Diptera) parasitizing nestling birds
In the course of studies on the effect of feeding DDT-killed insect larvae to nestling birds, some incidental information was gathered on Calliphorid parasites of the nestlings. The work was done at Lake Clear Junction, N. Y., during June and July, 1946.
Authors
J.L. George, R.T. Mitchell
Storage by bobwhite quail of Vitamin A fed in various forms
According to studies conducted with 236 bobwhite quail chicks at Patuxent Research Refuge, crystalline carotene in cottonseed oil fed at levels of 3000 I.U. (the requirement for optimum growth), 5000 I.U., and 25,000 I.U. per pound of feed, was utilized only 1/3 to 1/7 as efficiently as vitamin A alcohol; 1/2; to 1/10 as natural vitamin A ester; and 1/4 to 1/17 as vitamin A acetate, based on the s
Authors
R. B. Nestler, J.V. Derby, J.B. DeWitt
Twelfth breeding-bird census: 4. Damp deciduous scrub with numerous standing dead trees
No abstract available.
Authors
S. Oresman, J. Tiffany, C.S. Robbins
Calcium and phosphorus requirements of bobwhite quail chicks
Four experiments involving 873 bob-white quail (Colinus virginianus) chicks were conducted at the Patuxent Research Refuge, Laurel, Maryland. A comparison was made of calcium: phosphorus ratios of 1:1, 15:1, 1%: 1, 2:1, 2+:1,and 2%: 1in diets with phosphorus levels of 0.52, 0.75, 1.00, and 1.25 percent. The results indicate that the optimum level of phosphorus for growth is in the neighborhood of
Authors
R. B. Nestler, J.B. DeWitt, J.V. Derby, M. Moschler