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Filter Total Items: 2,915
Year Published: 1990

Wood duck population trends from the North American Breeding Bird Survey

The North American Breeding Bird Survey (BBS) has been conducted yearly since 1966, and can be used to describe relative population density and trends of birds in North America north of Mexico. Wood ducks (Air sponsa) are difficult to survey using conventional waterfowl monitoring techniques, but a large portion of their range is surveyed by the...

Fredrickson, Leigh H.; Burger, George V.; Havera, Stephen P.; Graber, David A.; Kirby, Ronald E.; Taylor, T. Scott; Sauer, J.R.; Droege, S.
Wood duck population trends from the North American Breeding Bird Survey; 1990; Book chapter; The 1988 North American Wood Duck Symposium; Sauer, J.R.; Droege, S.

Year Published: 1990

Elk in Olympic National Park: Will they persist over time?

No abstract available.

Houston, D.B.; Schreiner, Edward G.; Moorhead, Bruce B.; Krueger, K.A.

Year Published: 1989

Rise and fall of endrin usage in Washington state fruit orchards: Effects on wildlife

A study of the effects of endrin on wildlife was conducted from 1981 to 1983 in fruit orchards in central Washington State. The single post-harvest application of endrin as a rodenticide resulted in both acute and chronic toxicity to a variety of avian species. Of 194 birds found dead, brains of 125 were analysed; endrin toxicosis accounted for...

Blus, L.J.; Henny, Charles J.; Grove, Robert A.
Rise and fall of endrin usage in Washington state fruit orchards: Effects on wildlife; 1989; Article; Journal; Environmental Pollution; Blus, L. J.; Henny, Charles J.; Grove, Robert A.

Year Published: 1988

Effects of livestock grazing on eaptors with Emphasis on the southwestern U.S.

No abstract available

Kochert, Michael N.; Millsap, B.A.; Steenhof, K.

Year Published: 1987

Roosevelt elk density in old-growth forests of Olympic National Park

We explored the feasibility of censusing Roosevelt elk from a helicopter in the dense old growth forests of Olympic National Park. WA. Mean observed densities ranged from 8.0-11.6 elk/km2, with coefficients of variation averaging 19.9 percent. A provisional sightability factor of 74 percent suggested that actual mean densities ranged from 10.8-16....

Houston, D.B.; Moorhead, Bruce B.; Olson, R.W.

Year Published: 1986

Use of miniroutes and Breeding Bird Survey data to estimate abundance

1. Information on relative abundance is easily obtained and adds greatly to the value of an atlas project. 2. The Breeding Bird Survey (BBS) provides annual counts (birds per 50 roadside stops) that can be used to: (1) map relative abundance by physiographic region within a state or province, (2) map relative abundance on a more local scale by...

Robbins, C.S.; Dowell, B.A.
Use of miniroutes and Breeding Bird Survey data to estimate abundance; 1986; Book chapter; Proceedings of the Second Northeastern Breeding Bird Atlas Conference; Robbins, C.S.; Dowell, B.A.

Year Published: 1985

Organochlorine-induced mortality and residues in long-billed curlews from Oregon

In order to determine possible sources of vitamin A for quail, 37 species of insects and other invertebrates were analyzed for vitamin A and for carotene, and 26 species of seeds and fruits were assayed for carotene. The invertebrates showed no trace of vitamin A; but 8 herbivorous invertebrates and the praying mantis contained carotene. Most of...

Blus, L.J.; Henny, Charles J.; Krynitsky, A.J.
Organochlorine-induced mortality and residues in long-billed curlews from Oregon; 1985; Article; Journal; The Condor; Blus, L. J.; Henny, Charles J.; Krynitsky, A.J.

Year Published: 1984

Elk and deer diets in old-growth forests in western Washington

Dietary quality and overlap of sympatric Roosevelt elk (Cervus elaphus roosevelti) and Columbian black-tailed deer (Odocoileus hemionus columbianus) were investigated in old-growth forests of the Hoh Valley, Olympic National Park, Washington. Diets of both cervids were comprised mainly of common old-growth flora, particularly in winter. High...

Leslie, David M.; Starkey, Edward E.; Vavra, Martin

Year Published: 1967

A comparison of Oregon pellet and fish-meat diets for administration of sulfamethazine to Chinook salmon

The absorption of sulfamethazine by yearling spring chinook salmon (Oncorhynchus tshawytscha) was compared when administered in the Oregon Pellet and a fish-meat diet. The pelleted diet delivered the drug to the fish approximately twice as efficiently as the fish-meat diet. Dosage levels are recommended for both diets, and the efficacy of...

Amend, D.F.; Fryer, J.L.; Pilcher, K.S.