Publications

A single egg was collected at 62 nests of 10 seabird species from Oregon in 1979. The eggs were analyzed for organochlorine contaminants; contemporary shell thickness was compared with eggshells collected during earlier time periods. Concentrations of DDE and PCB's in 1979 were generally low with the most contaminated species being the Double-crested Cormorant (Phalacrocorax auritus), Leach's Stor

Background levels of DDT and its metabolites (ZDDT) were extremely low or not detected in five species of forest-dwelling bats in northeastern Oregon, i.e., areas not sprayed with DDT in 1974. Other organochlorine pesticides were rarely found and no polychlotinated biphenyls (PCBs) were detected at any time during the study. Four of five species of bats showed significant changes in Z:DDT residues

Blood samples from 433 Peregrine Falcons (Falco peregrinus) during fall and spring migrations, 1976-80, indicated that most of their pesticide burden, primarily DDE, was accumulated on wintering grounds in Latin America. DDE in spring migrants returning from Latin America for the first time declined significantly from 1979 to 1980. Only about 10% of breeding-age females contained organochlorine re

Large numbers ofCliff Swallows (Petrochelidon pyrrhonota) died in late May near Burns, Oregon, during cold, wet weather. The brains of five dead birds did not contain lethal concentrations of DDE, and no PCBs were detected.

Band-recovery data, harvest surveys, and spring and winter population surveys were used to estimate population parameters of ring-necked ducks (Aythya collaris). Mean annual survival rates of adult males (0.63 to 0.69) were higher (P < 0.05) than those of either adult females (0.48 to 0.58) or juveniles (0.31 to 0.41). Survival rates of winter-banded adult males were highest in the Mississippi Fly

Salt gland function and osmoregulation in aquatic birds drinking hyperosmotic water has been suggested to be impaired by organophosphorus insecticides. To test this hypothesis, adult ducks (Anas rubripes) were provided various regimens of fresh or salt (1.5% NaCl) water (FW, SW) and mash containing vehicle or 21 ppm fenthion (Fn) on days 1-7 and 7-12 of this study. The 8 treatments (day 1-7:day 7-

Inclusion body disease of suspected adenovirus etiology was the apparent cause of death of 9 captive kestrels (Falco sparverius). Cloacal hemorrhage was the only prominent gross lesion; disseminated hepatocellular necrosis and intranuclear inclusion bodies were evident microscopically. Attempts to reproduce the disease, and to propagate and serologically characterize the agent were unsuccessful.

No abstract available.

No abstract available.

The shiny cowbird (Molothrus bonariensis), a brood parasite, has recently spread into the Greater Antilles from South America via the Lesser Antilles. This species is a host generalist and upon reaching Puerto Rico exploited avian communities with no history of social parasitism. Forty-two percent of the resident non-raptorial land bird species were parasitized in mangrove habitat study areas. Cow

Royal Tern (Sterna maxima) eggs collected from two study areas on the central Texas coast in 1978 contained organochlorine residues at levels below those known to have adverse effects on avian reproduction and survival. Residues of zinc, copper, selenium, and arsenic were present at what appeared to be background levels. Mercury residues were elevated. Average organochlorine and metals residues

No abstract available.