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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
Authors
R.C. Stendell, H. M. Ohlendorf, E. E. Klaas, J. B. Elder

Nationwide residues of organochlorines in wings of adult mallards and black ducks, 1972-73

Organochlorine residues in wings of adult mallards and black ducks were monitored during the 1972-73 hunting season. DDE, DDT, DDD, dieldrin, and polychlorinated biphenyls (PCB's) were present in all samples. Mallard wings from Alabama contained the highest mean levels of DDE, DDT, DDD, dieldrin, and PCB's. Mallards and black ducks from the Atlantic Flyway and mallards from the Pacific Flyway cont
Authors
D. H. White, R.G. Heath

Are there condors in our future?

No abstract available.
Authors
S.R. Wilbur

The waterfowl hunter's perceptions of the waterfowl resource

No abstract available.
Authors
R.I. Smith, R. J. Roberts

Thermal adaptiveness of plumage color in screech owls

Clinal variation in the relative proportions of red and gray plum- age phases in Screech Owls (Otus asio) was analyzed by Owen (1963) and Marshall (1967). This variation was well known prior to Owen's work, but was misinterpreted (Baird, et al. 1874, Hasbrouck 1893, Allen 1893).]Laurel VanCamp and Charles Henny (MS) have 30 years of data on a northern Ohio Screech Owl population. They observed an
Authors
James A. Mosher, Charles J. Henny

The season--April, May, June, 1976

No abstract available.
Authors
C.S. Robbins