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: 41920
Biochemical identification of the mallard, Anas platyrhynchos, and black duck, A. rubripes
1. Eleven tissue systems from mallards and black ducks were examined for soluble proteins, lactate dehydrogenases and non-specific esterases through discontinuous polyacrylamide techniques.2. Biochemical relationships between the black duck and mallard are extremely similar.3. Hemoglobins and lactate dehydrogenase appear to be common in electrophoretic mobility between the two species.4. Approxima
Authors
R.P. Morgan, L.A. Noe, C. J. Henny
Reproductive activity in nine- and ten-month-old wolves
No abstract available.
Authors
D.C. Medjo, L. D. Mech
Monitoring arctic habitat and goose production by satellite imagery
Spacecraft imagery, especially from the National Atmospheric and Oceanic Administration's Improved TIROS (Television Infra-Red Observational Satellite) Operational Satellites, permits timely evaluations of snow and ice conditions encountered by arctic nesting geese. Imagery from the TIROS satellite for 5 wide]y scattered locations in arctic North America was obtained for three 3-day intervals in
Authors
H.M. Reeves, F.G. Cooch, R. E. Munro
Bird collections in the United States and Canada: Addenda and corrigenda
Since publication of our report on the avian collections in the United States and Canada (Banks, Clench, and Barlow 1973, Auk 90: 136- 170) several changes and additions have come to our attention. In some cases, recent curatorial work has resulted in more accurate counts to replace previous estimates. Other collections have grown markedly in the last few years. Some important private or instituti
Authors
M.H. Clench, R.C. Banks, J.C. Barlow
Reproductive rate and temporal spacing of nesting of red-winged blackbirds in upland habitat
The literature contains numerous studies on Red-winged Blackbird (Agelaius phoeniceus) reproduction. Francis (1971) summarized eight studies dealing with nesting success. These and other studies have also provided information on breeding chronology, clutch sizes, sex ratios, survival rates for eggs and nestlings, reproductive physiology, and other life history aspects of reproduction. With few exc
Authors
Richard A. Dolbeer
Lead in tissues of mallard ducks dosed with two types of lead shot
Mallard ducks (Anas platyrhynchos) were sacrificed one month after ingesting one number 4 all-lead shot or one number 4 lead-iron shot. Livers, kidneys, blood, wingbones, and eggs were analyzed for lead by atomic absorption. Necropsy of sacrificed ducks failed to reveal any of the tissue lesions usually associated with lead poisoning in waterfowl. Lead levels in ducks given all-lead shot averaged
Authors
M. T. Finley, M. P. Dieter, L. N. Locke
Behavior of mallard ducklings from parents fed 3 ppm DDE
Mallard ducks fed a diet containing 3 ppm DDE (equal to about 0.6 ppm in a natural succulent diet) laid eggs that contained an average of 5.8 ppm DDE; ducklings that hatched from these eggs differed from controls in behavioral tests designed to measure responses to a maternal call and to a frightening stimulus. In response to the maternal call, ducklings from parents fed DDE were hyper-responsive;
Authors
G. H. Heinz
Brain lesions in mallard ducklings from parents fed methylmercury
Methylmercury dicyandiamide was fed to mallard ducks at 3 ppm mercury. Mercury accumulated in the eggs to an average of 7.18 and 5.46 ppm on a wet-weight basis in 2 successive years. Mercury in the eggs is believed to have caused brain lesions in the hatched ducklings. Lesions included demyelination, neuron shrink-age, necrosis, and hemorrhage in the meninges overlying the cerebellum. Brains of de
Authors
G. H. Heinz, L. N. Locke
Elevated heptachlor epoxide and DDE residues in a merlin that died after migrating
No abstract available.
Authors
C. J. Henny, J. R. Bean, R.W. Fyfe