polybrominated biphenyl (pbb) contamination of the pine river, gratiot, and midland counties, michigan.michigan chemical corporation, st. louis, michigan manufactured pbb from 1970 until november 20, 1974. studies in 1974 showed significant quantities of pbb in effluent discharged from the facility and in water, fish, ducks, and sediments from the pine river. fish uptake rates and bioconcentration factors were estimated. followup surveys over the three year period since the termination of pbb production indicate a decline in pbb loadings to the river but no significant corresponding decline of pb ...1978209975
mercury in eggs of aquatic birds, lake st. clair--1973.eggs from four species of aquatic birds inhabiting waterways of the lake st. clair region were collected in 1973 and analyzed for mercury. species analyzed were mallard ducks (anas platyrhynchos), common terns (sterna hirundo), black-crowned night herons (nycticorax nycticorax), and great egrets (casmerodius albus). mallard eggs contained relatively low residue levels, less than 0.05-0.26 ppm, and common tern eggs contained the highest residues, ranging up to 1.31 ppm. mercury levels in the eggs ...1976940735
disease patterns in the detroit zoo: a study of the avian population from 1973 through 1983.a retrospective study was conducted to evaluate disease patterns in birds at the detroit zoo from 1973 through 1983. data were derived from the zoo's medical and animal census records; the mean (+/- sd) population of birds during the study period was 469 +/- 42. overall annual morbidity rates were 12.5% to 21.5%, with spring months having the highest morbidity rates. annual mortality rates were 3.1% to 15.2%; 23.9% of the deaths were caused by microbial agents (particularly erysipelothrix rhusio ...19853878351
susceptibility of pekin and muscovy ducks to haemoproteus nettionis.domestic muscovy (caririna moschata) and pekin (anas platyrhynchos) ducklings were exposed to or injected with homogenates of culicoides flies collected at white pine, michigan. gametocytes of haemoproteus nettionis were detected in both species of ducks at 16 days post-exposure. culicoides downesi was indicated as a vector of h. nettionis in northern michigan. blood infections occurred with a higher prevalence and reached a higher intensity in muscovy ducks. endogenous tissue stages of h. netti ...19846429353
organochlorine and metal residues in eggs of waterfowl nesting on islands in lake michigan off door county, wisconsin, egg from each of 114 red-breasted merganser (mergus serrator) nests in 1977 and 92 nests in 1978 was collected and later analyzed for organochlorines, polybrominated biphenyls (pbbs), polychlorinated styrenes (pcss), and metals. one egg was also collected from each of the dabbling duck nests located. twenty-nine of these eggs were analyzed for organochlorines and metals in 1977; 10 eggs were analyzed in 1978. all merganser eggs contained dde, polychlorinated biphenyls (pcbs), and dieldrin; a ...19816796936
ortho- and paramyxoviruses in the migratory waterfowl of michigan.four hemagglutinating agents were isolated from 100 cloacal samples collected from migratory water foul during the 1977 hunting season in michigan. three of the isolates are paramyxoviruses and they show no reactivity with antisera to newcastle disease virus. the fourth isolate is an orthomyxovirus, a/duck/michigan/77 (hsw1 nav2). under experimental conditions two of the paramyxoviruses were recovered from the intestinal tract of chicks, and the third paramyxovirus was recovered from both the re ...19817253097
residues of organochlorines in mallards and blue-winged teal collected in colombia and wisconsin, 1984-1989.we compared the seasonal concentrations of 12 organochlorine (oc) compounds in samples of breast muscle, associated skin, and subcutaneous fat of blue-winged teal (anas discors) collected in ciénaga grande de santa marta, colombia (1987-1988), and of mallards (anas platyrhynchos) and blue-winged teal collected in wisconsin (1984-1989). although these species have similar feeding habits and overlapping breeding distributions, their winter ranges differ markedly. most blue-winged teal winter in th ...19968781073
the epizootiology of leucocytozoon simondi infections in domestic ducks in northern michigan. 195214933389
epidemiologic investigation of riemerella anatipestifer in a commercial duck company by serotyping and dna fingerprinting.a commercial duck company that raises approximately two million pekin ducks per year experienced an outbreak of riemerella anatipestifer (ra) on nine farms over a 1-yr period. owing to concerns that the bacteria was being spread from farm to farm, an investigation using serotyping and dna fingerprinting was performed. the results revealed that there were three different strains of ra involved in the outbreak. one strain was spread from one farm to six other farms, while another strain from the s ...201020608551
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