Publications

No abstract available.

Molybdenum toxicity, molybdenosis, in ruminant animals has been identified in at least 15 states and in Canada, England, Australia, and New Zealand. In most western states, molybdenosis has been associated with strip-mine spoil deposits. Molybdenum toxicity has been diagnosed in cattle pastured near uranium strip-mine spoils in several Texas counties. Recent reports from hunters and the authors' o

No abstract available.

Streptococcus zooepidemicus was isolated from the interstinal tract of an adult male bald eagle (Haliaeetus leucocephalus) found dead in Minnesota in 1974.

Snakes of the genus Regina feed almost exclusively on crayfish. The paired, symmetrical gastroliths of crayfish are not digested and are detectable from x-rays of the snake. Gastrolith length is directly proportional to carapace length and can be obtained from x-rays. Carapace length can be converted to kcal of ingested energy. Using these relationships and repeated captures of radio-telemetered

No abstract available.

The 24-hr median lethal dose (LD50) of dicrotophos (3-hydroxy-N,N-dimethyl-cis-crotonamide dimethyl phosphate) for free-living 5-day-old nestling European starlings (Sturnus vulgaris, LDso = 4.92 mg/kg body wt) was about one-half that obtained for free-living 15day-old nestlings (9.59 mg/kg) and captive adult males (8.37 mg/kg) and females (8.47 mg/ kg). Nestlings and adults with low pretreatment

Swallows (Hirundo rustica) collected within the right-of-way of a major Maryland highway were greater than those found in Barn Swallows nesting within a rural area. Lead concentrations in the feathers of adults from the highway colony were also greater than Lead concentrations in the carcasses and stomach contents of adult and nestling Barn those of rural adults, but concentrations in the feathers

We evaluated organochlorine residues in 12 species of hawks. owls, and eagles from the Columbia Basin of Oregon between 1978 and 1981. Companion studies showed that heptachlor epoxide (HE) induced adult mortality and reduced productivity of the Canada Goose (Branta canadensis) and American Kestrel (Falco sparverius).ln this study, brain tissue from raptors found dead and sample eggs from 90 nests

Organochlorine contamination was studied in 8 black-crowned night heron (N. nycticorax) populations nesting in Washington, Oregon and Nevada [USA] in 1978-1980. DDE was detected in 220 eggs sampled; eggshell thickness was negatively correlated with residues of DDE and polychlorinated biphenyls (PCB). Other contaminants were detected in .ltoreq. 35% of the eggs. Except for the 2 Columbia River c

Organochlorine residues were measured in the carcasses and, in some cases, brains and stomach contents of four species of birds collected along the Sheboygan River, Wisconsin during the years 1976 to 1980. Polychlorinated biphenyls (PCBs) were high in all samples and were the contaminants of greatest concern. Carcass residues ranged from 23 to 218 ppm PCBs on a wet weight basis; these are levels a

The acute toxicities of 13 granular anticholinesterase insecticides were compared with their technical grade active ingredients by administering single oral doses of chemical to adult Northern bobwhites (Colinus virginianus) and evaluating resultant LD50 values and dose-response curves. Similar tests with ringed turtledoves (Streptopelia risoria) were conducted with five of the granular formulatio