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: 41763
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
Effects of DDT and other insecticides on fish and wildlife: Summary of investigations during 1947
No abstract available.
Authors
J.P. Linduska, E. W. Surber
Populations and home range relationships of the box turtle, Terrapene carolina (Linnaeus)
This field study was conducted at the Patuxent Research Refuge, Laurel, Maryland, during the years 1944-1947.
Authors
L. F. Stickel