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Publications

View citations of publications by National Wildlife Health Center scientists since our founding in 1975.  Access to full-text is provided where possible.

Filter Total Items: 1594

Causes of mortality in common loons

Summarized are necropsy results from 222 carcasses of Common Loons (Gavia immer) submitted to the National Wildlife Health Research Center from 1976 through 1991.  The carcasses were from 18 states, and 10 or more birds each were from Minnesota, Florida, Virginia, Michigan, Wisconsin, Maine, and North Carolina.  Seventy-three (33%) carcasses were emaciated, and in some of these birds emaciation wa
Authors
J. Christian Franson, David J. Cliplef

A stochastic population model of mid-continental mallards

No abstract available.
Authors
Rolf R. Koford, J.R. Sauer, D. H. Johnson, J. D. Nichols, M. D. Samuel

Duck virus enteritis

No abstract available.
Authors
D. E. Docherty, J. C. Franson

Chemical ions affect survival of avian cholera organisms in pondwater

Avian cholera (Pasteurella multocida) is a major disease of wild waterfowl, but its epizootiology remains little understood. Consequently, we examined whether chemical ions affected survival of avian cholera organisms in water collected from the Nebraska Rainwater Basin where avian cholera is enzootic. We tested the response of P. multocida to ammonium (NH4), calcium (Ca), magnesium (Mg), nitrate
Authors
J.I. Price, B.S. Yandell, W.P. Porter

Implanting radio transmitters in wintering canvasbacks

To conduct telemetry studies of wintering canvasbacks (Aythya valisineria) on Chesapeake Bay [Maryland, USA], we needed to devise a suitable method of radio transmitter attachment. We describe as aseptic, intraabdominal surgical technique, using the inhalation anesthetic isoflurane, to implant 20-g radio transmitters in free-ranging canvasbacks. We evaluated the technique over 3 winters (1987-89),
Authors
Glenn H. Olsen, F. Joshua Dein, G. Michael Haramis, Dennis G. Jorde

Control of avian influenza: Philosophy and perspectives on behalf of migratory birds

Aquatic birds are considered the primary reservoir for influenza A viruses (Nettles et al., 1987).  However, there is little concern about avian influenza among conservation agencies responsible for the welfare of those species.  IN contrast, the poultry industry has great concern about avian influenza and view aquatic birds as a source for infection of poultry flocks.  In some instances, differen
Authors
Milton Friend

Polychlorinated biphenyl residues and egg mortality in double-crested cormorants from the Great Lakes

We evaluated the overall potency of polychlorinated biphenyl (PCB)-containing extracts from double-crested cormorant (Phalacrocorax auritis) eggs with an in vitro bioassay system, the H4IIE rat hepatoma cell bioassay. Results from the H4IIE bioassay were strongly correlated with the hatching success of eggs in the colonies, whereas conventional methods of PCB analysis correlated poorly with hatchi
Authors
D. E. Tillitt, G.T. Ankley, J. P. Giesy, J.P. Ludwig, H. Kurita-Matsuba, D. V. Weseloh, P.S. Ross, C.A. Bishop, L. Sileo, K. L. Stromborg, J. Larson, T.J. Kubiak

Prevalence of lead exposure among age and sex cohorts of Canada geese

We examined the prevalence of lead exposure from ingestion of waste lead shot among age and sex cohorts of Canada geese (Branta canadensis) on the breeding, migration, and wintering grounds of the Eastern Prairie Population. Blood samples from 6963 geese were assayed for lead concentration by atomic absorption spectrophotometry. On the breeding grounds, no goslings and <1% of adults showed evidenc
Authors
S. DeStefano, C. J. Brand, D. H. Rusch

Lead exposure in Canada geese of the eastern prairie population

We monitored lead exposure in Eastern Prairie Population Canada geese during summer-winter, 1986-1987 and 1987-1988 at 5 areas. Blood lead concentrations in geese trapped during summer at Cape Churchill Manitoba were below levels indicative of recent lead exposure (0.18 ppm). Geese exposed to lead (≥0.18 ppm blood lead) increased to 7.6% at Oak Hammock Wildlife Management Area (WMA), southern Mani
Authors
S. DeStefano, C. J. Brand, D. H. Rusch, Daniel L. Finley, M.M. Gillespie

Effects of resighting errors on capture-resight estimates for neck-banded Canada geese

Biologists who study neck-banded Canada Geese (Branta canadensis) have used capture and resighting histories to estimate annual resighting rates, survival rates and the number of marked birds in the population. Resighting errors were associated with 9.4% (n = 155) of the birds from a sample of Canada Geese neckbanded in the Mississippi flyway, 1974-1987, and constituted 3.0% (n = 208) of the resig
Authors
N.T. Weiss, M. D. Samuel, D. H. Rusch, F.D. Caswell

Diseases of whooping cranes seen during annual migration of the Rocky Mountain flock

Diagnosis and treatment of ill whooping cranes of the Rocky Mountain flock was provided by a zoological facility. Cases of avian cholera, lead poisoning and avian tuberculosis were encountered. The zoo efforts were an adjunct to the U.S. Fish and Wildlife Service, Whooping Crane Recovery Plan.
Authors
S. Bret Snyder, Michael J. Richard, Roderick C. Drewien, Nancy J. Thomas, John P. Thilsted