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
UV identification and quantitative measurement of quinaldine residues in fish
A method for the confirmatory analysis of quinaldine residue in fish is described. The method utilizes the same extraction and cleanup procedure as the GLC method reported previously. The lower limit of sensitivity for quinaldine residue in fish muscle is 0.01 ppm. Identification is accomplished by comparing the UV spectra of the sample and a standard solution of quinaldine.
Authors
J. L. Allen, J.B. Sills
The demography of the lizard, Uta stansburiana Baird and Girard, in southern Nevada
No abstract available.
Authors
F.B. Turner, G.A. Hoddenbach, P.A. Medica, J.R. Lannom
Control of pH in MS-222 anesthetic solutions
Abstract has not been submitted
Authors
J. L. Allen, P.D. Harman
GLC determination of quinaldine residue in fish
A procedure for the determination of quinaldine residue in various fish tissues is described.
Homogenized tissues are extracted wi th hexane-ethyl ether, the extracts are concentrated
by partitioning through O.IN sulfuric acid, and the residues are measured by alkali Harne
ionization gas chromatography. Muscle tissues containing from 0.01 to 10.0 ppm quinaldine
were successfully analyzed with
Authors
J. L. Allen, J.B. Sills
Waterfowl in relation to land use and water levels on the Spring Run Area
Low water levels during critical phases of the breeding cycle appear to have caused population declines of waterfowl and other marsh birds on the Spring Run Game Management Area. Pair-counts indicated a decline from 70 pairs of waterfowl in 1965 to 2 pairs in 1968. Nest success of upland nesting blue-winged teal (Anas discors) averaged 33% and mallards (Anas platyrhyncos) averaged 23%. Blue-winged
Authors
G.L. Krapu, D.R. Parsons, M.W. Weller
Alula removal technique for identifying wings of released waterfowl
A technique for marking waterfowl ducklings less than 1 day old was developed to permit subsequent identification in the hand. Marking was accomplished by removing the alulae from wings of mallard (Anas platyrhynchos) ducklings with a small scissors or clipper. No differences in growth rate, behavior, or flight capability were noted between clipped and nonclipped birds. Thirty-five hundred ducklin
Authors
G.V. Burger, R. J. Greenwood, R.C. Oldenburg
Waterfowl breeding habitat in agricultural and nonagricultural land in Manitoba
Waterfowl populations and habitat characteristics were examined on 33 potholes in each of two 16-square-mile study areas of agricultural and nonagricultural land in southwestern Manitoba. The agricultural land potholes, lacking in or incompletely surrounded by trees, received greater use by lesser scaup (Aythya affinis), canvasback (A. valisineria), redhead (A. americana), coot (Fulica americana),
Authors
T.J. Dwyer
Summer foods of lesser scaup in subarctic taiga
Reports on the food of 25 adult and 38 juvenile Aythya affinis, collected in June-Sept 1967 along the Yellowknife Highway north of Great Slave Lake. The vegetation, physiography and ponds of the area, the collecting and statistical methods are briefly described. Approx 99% of the scaup diet was animal material; juveniles in mid-summer fed on freeswimming organisms such as Chaoborinae (phantom midg
Authors
J. C. Bartonek, H. W. Murdy
Studies on the life history and development of Cuterebra polita (Diptera: Cuterebridae) in four species of rodents
Cuterebra polita Coquillett is a primary parasite of the pocket gopher, Thomomys talpoides, in the western United States. It also occurs secondarily in other wild rodents that come into close contact with pocket gophers.Field studies disclosed pursuit, mating, and ovipositing at an aggregation site near Monte Cristo, Utah. Eggs were individually attached to fibrous roots suspended from the roof of
Authors
K.J. Capelle