Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16780
The effect of embryonic development on the thickness of the eggshells of the coturnix quail
The average thickness of the shells from 75 unincubated coturnix quail eggs was found to be 0.193 mm. This was 7.3 percent greater than the average thickness (0.179 mm.) of the shells from 60 fully incubated eggs from the same hens. The two sets of eggs were collected simultaneously. This thickness difference was statistically significant (t-test:p< 0.005).
Authors
J.F. Kreitzer
Reproductive patterns in captive American kestrels (sparrow hawks)
Female kestrels acquired in Florida in winter as full-grown birds began laying eggs a month later than did those acquired as nestlings from northeastern United States. Egg laying dates of the two groups did not overlap in 1966 through 1968. The later nesting Florida-wintering females may have nested in captivity at a latitude farther south of their normal breeding range than did those from the Nor
Authors
Ron Porter, Stanley N. Wiemeyer
DDE at low dietary levels kills captive American kestrels
Two of 14 male American kestrels died after 14 and 16 months on a diet containing 2.8 p.p.m., wet weight, p, p'-DDE. The brains of the two birds contained DDE residues of 213 and 301 p.p.m. compared with 14.9 p.p.m. (range, 4.47-26.6 p.p.m.) (wet weights) for 11 of the adult males which were sacrificed after 12 to 16 months on dosage. Autopsies of the two birds compared with autopsies of the sacri
Authors
Ron Porter, Stanley N. Wiemeyer
Lethal mobilization of DDT by cowbirds
This study is an experimental demonstration of lethal mobilization of DDT by brown-headed cowbirds (Molothrus ater) and the effects of food deprivation on the distribution and loss of DDT, DDD, and DDE. The principal experimental group consisted of 20 birds fed a dietary dosage of 100 ppm of DDT for 13 days. After 2 days of full rations of untreated food, they were subjected to food restriction.
Authors
A.C. Van Velzen, W.B. Stiles, L. F. Stickel
The ecology of the Puerto Rican parrot, an endangered species
No abstract available.
Authors
C.B. Kepler
Residues of organochlorine pesticides, polychlorinated biphenyls, and mercury in bald eagle eggs and changes in shell thickness--1969 and 1970
Twenty-three bald eagle eggs collected in Alaska, Maine, Michigan, Minnesota, and Florida during 1969 and 1970 were analyzed for organochlorine pesticides, polychlorinated biphenyls, and mercury. All eggs contained residues of DDE, dieldrin, PCB's, and mercury. Average residue concentrations were lowest in eggs from Alaska. Significant eggshell thinning has occurred among eggs from most major a
Authors
Stanley N. Wiemeyer, B. M. Mulhern, F.J. Ligas, R.J. Hensel, J.E. Mathisen, F.C. Robards, S. Postupalsky
The distribution and ecology of the Puerto Rican whip-poor-will, an endangered species
No abstract available.
Authors
C.B. Kepler, A.K. Kepler
A bibliography of Oregon ornithology (1935-1970) with a cross-referenced list of the birds of Oregon
No abstract available.
Authors
J. M. Scott, T.W. Haislip, M. Thompson
Migration patterns and wintering localities of American ospreys
North American ospreys (Pandion haliaetus carolinensis), banded primarily in the Middle Atlantic States and in New England, apparently migrate to their winter grounds in the West Indies and South America on a broad front. Ospreys do not return to the United States as 1-year-olds, but an estimated 28 to 55 percent returrt to their natal vicinity (state where hatched or an adjacent state) as 2-year
Authors
C. J. Henny, W.T. Van Velzen
An appraisal of the winter bird-population study technique
No abstract available.
Authors
C.S. Robbins
Thirty-sixth breeding bird census. 6. Upland tulip tree-maple-oak forest
No abstract available.
Authors
C.S. Robbins