Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16780
Residues of DDT in brains and bodies of birds that died on dosage and in survivors
Residues of 1,1 ,l-trichloro-2,2-bis(p-chlorophenyl)-ethane (DDT) and 1,1 -dichloro-2.2-bis(p-chlorophenyl)-ethane (DDD) in brains of cowbirds (Molothrus ater) killed hy dietary dosage of DDT were similar in birds that died after various lengths of time on dosage and in birds that died of delayed effects after as much as 40 days on clean food, Residues of DDT and DDD, but not of 1,1 -dichloro-2.2-
Authors
L. F. Stickel, W. H. Stickel, R. Christensen
Thirtieth breeding-bird census: Salt marsh edge habitat (Delaware)
No abstract available.
Authors
S.T. Brooks, W.J. Wayne, R.L. West, J. T. Linehan
Movements of starlings in relation to a roost near Hanover, Pennsylvania
No abstract available.
Authors
D. P. Fankhauser
Thirtieth breeding-bird census: Coastal lowland-mixed woods (Delaware)
No abstract available.
Authors
D. Ward, R. Ward, J. T. Linehan
Subinoculation as a technique in the diagnosis of avian plasmodium
In two successive years, 1964 and 1965, blood subinoculated from wild Canada geese, negative for Plasmodium by examination of peripheral blood smears, into 5-day-old domestic geese produced 60 % infection in the recipients. Prepatent and patent periods, as well as intensity of parasitemia showed much variation. Intramuscular inoculation produced the same prevalence as the intravenous route, but lo
Authors
C. M. Herman, J.O. Knisley, E.L. Snyder
Breeding behavior of immature mourning doves
Some immature mourning doves (Zenaidura mncroura) are capable of breeding in their first (calendar) year of life. The breeding activities of immatures observed in this study included calling, copulating, and nesting. Development of sexual structures such as cloacal papillae, oviduct openings, and gonads was also regarded as evidence of breeding potential. Immatures were identified principally by w
Authors
H.D. Irby, L. H. Blankenship
Thirtieth breeding-bird census. 41. Uneven-aged mixed hardwood forest (urban woodlot)
No abstract available.
Authors
R. E. Jones, J. T. Linehan
Weather and pheasant populations in southwestern North Dakota
High productivity and survival of ring-necked pheasants (Phasianus colchicus) were correlated with high rainfall and cool temperatures in May and June during an 8-year period in southwestern North Dakota. These findings differed markedly from those of several earlier studies in the less arid midwestern United States where cool, wet weather in the spring generally affected pheasant populations adve
Authors
R.K. Martinson, C.R. Grondahl
Proportion of recovered goose and brant bands that are reported
A few more than one-third of the goose and brant bands recovered by hunters were reported to the Bird Banding Laboratory (a rate of 0.361) during the 1962-64 hunting seasons. We calculated this band-reporting rate by comparing the estimated number of goose and brant bands recovered by hunters, based on a mail questionnaire survey, with the number of bands actually reported to the Bird Banding Labo
Authors
R.K. Martinson, J.A. McCann
Fall food habits of wood ducks from Lake Marion, South Carolina
A total of 108 stomachs of wood ducks (Aix sponsa) collected from hunters on the upper end of Lake Marion, South Carolina, between November 29 and December 6, 1961, were examined for information on food habits. Six plants made up over 98 percent of the total volume. Five were tree fruits: water and pin oak (Quercus nigra and Q. palustris), baldcypress (Taxodium distichum), sweetgum (Liquidambar s
Authors
F. B. McGilvrey