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January 1, 1992

Chemical ions affect survival of avian cholera organisms in pondwater 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)...

Authors

J.I. Price, B.S. Yandell, W.P. Porter

Ecosystems Mission Area, National Wildlife Health Center

July 1, 1991

Fall and winter distribution of Canada geese in the Mississippi flyway Fall and winter distribution of Canada geese in the Mississippi flyway

Canada geese (Branta canadensis) from northern Manitoba and northern Ontario were marked with leg bands and neck bands and observed throughout the Mississippi flyway from 1978 to 1989. We used observations of neck-banded geese within each state to determine the relative fall/winter distribution of the Eastern Prairie Population (EPP) and the Mississippi Valley Population (MVP)...

Authors

Michael D. Samuel, Donald H. Rusch, Kenneth F. Abraham, Murray M. Gillespie, J. Paul Prevett, George W. Swenson

Ecosystems Mission Area, National Wildlife Health Center

May 1, 1991

Research center analyses health problems of endangered species Research center analyses health problems of endangered species

No abstract available.

Authors

R. Windingstad

Ecosystems Mission Area, National Wildlife Health Center

January 1, 1991

Isolation of poxvirus from debilitating cutaneous lesions on four immature grackles (Quiscalus sp.) Isolation of poxvirus from debilitating cutaneous lesions on four immature grackles (Quiscalus sp.)

Poxvirus was isolated from nodules on four immature grackles (Quiscalus sp.) collected in two residential areas of Victoria, Texas. All of the birds were emaciated and had nodules on the eyelids, bill, legs, toes, and areas of the skin on the wings, neck, and ventral abdomen. These pox nodules were extensive and probably interfered with both sight and flight. The preliminary diagnosis...

Authors

D. E. Docherty, R.I.R. Long, Edward L. Flickinger, L. N. Locke

Ecosystems Mission Area, National Wildlife Health Center

January 1, 1991

Mortality in tundra swans Cygnus columbianus Mortality in tundra swans Cygnus columbianus

Our paper identifies and examines the significance of hunting and non-hunting mortality affecting the Eastern Population (EP) and Western Population (WP) (see Serie & Bartonek 1991a) of Tundra Swans. Sport hunting (Serie & Bartonek 1991b), native subsistence hunting (Copp 1989, Stewart & Bernier 1989), malicious shooting (McKelvey & MacNeill 1981), avian cholera (Friend et al. 1981...

Authors

James C. Bartonek, J.R. Serie, K. A. Converse

Ecosystems Mission Area, National Wildlife Health Center

January 1, 1991

Quarterly Wildlife Mortality Report Quarterly Wildlife Mortality Report

No abstract available.

Authors

G. Kidd

Ecosystems Mission Area, National Wildlife Health Center

January 1, 1991

Lead exposure in Canada geese of the eastern prairie population 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)...

Authors

S. DeStefano, C. J. Brand, D. H. Rusch, Daniel L. Finley, Murray M. Gillespie

Ecosystems Mission Area, National Wildlife Health Center

January 1, 1991

Brain acetycholinesterase activity in botulism-intoxicated mallards Brain acetycholinesterase activity in botulism-intoxicated mallards

Brain acetylcholinesterase (AChE) activity in captive-reared mallards (Anas platyrhynchos) that died of botulism was compared with euthanized controls. AChE levels for both groups were within the range reported for normal mallards, and there was no significant difference in mean AChE activity between birds that ingested botulism toxin and died and those that did not.

Authors

Tonie E. Rocke, M.D. Samuel

Ecosystems Mission Area, National Wildlife Health Center

January 1, 1991

Effects of lead shot ingestion on selected cells of the mallard immune system Effects of lead shot ingestion on selected cells of the mallard immune system

The immunologic effects of lead were measured in game-farm mallards (Anas platyrhynchos) that ingested lead shot while foraging naturally, mallards intubated with lead shot, and unexposed controls. Circulating white blood cells (WBC) declined significantly in male mallards exposed to lead by either natural ingestion or intubation, but not females. Spleen plaque-forming cell (SPFC) counts...

Authors

Tonie E. Rocke, M.D. Samuel

Ecosystems Mission Area, National Wildlife Health Center

January 1, 1991