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: 41918
A comparison of methods used to obtain age ratios of snow and Canada geese
The validity of group counts, cannon-net catches, and hunter-bag checks for estimating productivity of lesser snow geese (Anser caerulescens caerulescens) and small Canada geese (Branta canadensis hutchinsii-parvipes complex) was studied at Sand Lake National Wildlife Refuge during the falls of 1965 and 1966. Age ratios of snow geese obtained from net-trapped samples were significantly higher (P <
Authors
K.F. Higgins, R. L. Linder, P. F. Springer
Food habits of canvasbacks, redheads, and lesser scaup in Manitoba
No abstract available.
Authors
James C. Bartonek, Joseph J. Hickey
Structure of the New England herring gull population
Measurements of the rates of population increase, reproduction, and mortality together with an observed age ratio, were used to analyze the population of the Herring Gull in New England. Data from sporadic censuses prior to this study, aerial censuses by the authors, and National Audubon Society Christmas Bird Count indicated that the New England breeding population has been doubling every 12 to 1
Authors
John A. Kadlec, William H. Drury
Distribution of DDT residues in tissues of birds in relation to mortality, body condition, and time
No abstract available.
Authors
L. F. Stickel, W. H. Stickel
Population characteristics and physical condition of alewives, Alosa pseudoharengus, in a massive die-off in Lake Michigan, 1967
The length, age and sex compositions of dead and dying alewives collected in June 1967 at six locations in southern, central, and northern Lake Michigan are compared with those of fish taken in experimental trawls at five locations in April and June 1967. Behavior at the time of death, condition of the body and gonads, stomach contents, and the incidence of Saprolegnia and subcutaneous hemorrhages
Authors
Edward H. Brown
Dietary Factors and Hepatoma in Rainbow Trout (Salmo gairdneri). I. Aflatoxins in Vegetable Protein Feedstuffs
Aflatoxins (toxic metabolites of the mold Aspergillus flavus) were present in a commercial trout ration causing hepatoma in rainbow trout. Cottonseed meal and solvent extracts of cottonseed meal and of rations containing cottonseed meal and peanut meal were found by chemical assay and confirmed by duckling assay to contain aflatoxins. Diets containing these materials and a purified test diet to wh
Authors
R.O. Sinnhuber, J.H. Wales, J.L. Ayers, R.H. Engebrecht, D.F. Amend
Histopathogenesis of experimentally induced viral hemorrhagic septicemia in fingerling rainbow trout (Salmo gairdneri)
Abstract not available.
Authors
W. T. Yasutake, C.J. Rasmussen
Role of intestinal microflora in the degradation of DDT by rainbow trout (Salmo gairdneri)
Though liver homogenates show apparent microsomal enzyme DDT-dehydrochlorinase activity, in the intact fish the intestinal microflora play a major role in DDT detoxication. Since the presence of this microflora in fish depends on the recent intake of food (12), the rate of detoxication and hence the toxicity of ingested DDT to the rainbow trout will probably depend somewhat on the available food s
Authors
G. Wedemeyer
Vibrio anguillarum from an epizootic in rainbow trout (Salmo gairdneri in the USA.
No abstract available.
Authors
A. J. Ross, J.E. Martin, V. Bressler
Pasteurella multocida isolated from a California sea lion (Zalophus californianus)
No abstract available.
Authors
M.C. Keyes, F.W. Crews, A. J. Ross