Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16784
Duck deaths from accidental ingestion of anthelmintic
No abstract available.
Authors
J. L. Ludke, L. N. Locke
Mapping wetlands on beaver flowages with 35-mm photography
Beaver flowages and associated wetlands on the Chippewa National Forest, north-central Minnesota, were photographed from the ground and from the open side window of a small high-wing monoplane. The 35-mm High Speed Ektachrome transparencies obtained were used to map the cover-type associations visible on the aerial photographs. Nearly vertical aerial photos were rectified by projecting the slides
Authors
R.E. Kirby
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