Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16784
Behavior of mallard ducklings from parents fed 3 ppm DDE
Mallard ducks fed a diet containing 3 ppm DDE (equal to about 0.6 ppm in a natural succulent diet) laid eggs that contained an average of 5.8 ppm DDE; ducklings that hatched from these eggs differed from controls in behavioral tests designed to measure responses to a maternal call and to a frightening stimulus. In response to the maternal call, ducklings from parents fed DDE were hyper-responsive;
Authors
G. H. Heinz
Brain lesions in mallard ducklings from parents fed methylmercury
Methylmercury dicyandiamide was fed to mallard ducks at 3 ppm mercury. Mercury accumulated in the eggs to an average of 7.18 and 5.46 ppm on a wet-weight basis in 2 successive years. Mercury in the eggs is believed to have caused brain lesions in the hatched ducklings. Lesions included demyelination, neuron shrink-age, necrosis, and hemorrhage in the meninges overlying the cerebellum. Brains of de
Authors
G. H. Heinz, L. N. Locke
Elevated heptachlor epoxide and DDE residues in a merlin that died after migrating
No abstract available.
Authors
C. J. Henny, J. R. Bean, R.W. Fyfe
Effect of dieldrin and Aroclor 1242 on Japanese quail eggshell thickness
No abstract available.
Authors
E. F. Hill, R.G. Heath, J.D. Williams
Sexual maturation and productivity of Japanese quail fed graded concentrations of mercuric chloride
Japanese quail (Coturnix c. japonica) were fed 0, 2, 4, 8, 16, and 32 p.p.m. Hg as mercuric chloride (HgCl2) from the time of hatching up to the age of 1 year. None of the birds manifested any gross signs of mercury poisioning. Food consumption, growth rate, and weight maintenance were unaffected. Initial oviposition tended to occur at a younger age as dietary mercuric chloride increased, e.g., th
Authors
E. F. Hill, C.S. Shaffner
The effects of orchard pesticide applications on breeding robins
From 1966 through 1968, robins reproduced successfully in commercial apple orchards which were periodically sprayed with DDT, dieldrin, and other pesticides. Observations by a Z-man team using walkie-talkies revealed that breeding robins obtained essentially all food for themselves and nestlings from unsprayed areas adjacent to the orchards. Invertebrate trapping in sprayed and unsprayed areas sho
Authors
E.V. Johnson, G.L. Mack, D.Q. Thompson
Some characteristics of fall migration of female woodcock
Nine female woodcock (Philohela minor) were radio-tagged in central Pennsylvania before fall migration to monitor premigratory and migratory movements. Within 15 days of departure, 5 of the birds moved 0.8 to 8.0 km from their normally used area, but the remaining 4 did not move. In 1973 five marked woodcock began migration between 30 November and 8 December. In 1974, four birds departed between
Authors
R.A. Coon, P.D. Caldwell, G.L. Storm
White-tailed deer migration and its role in wolf predation
Seventeen white-tailed deer (Odocoileus virginianus) were radio-tagged in winter yards and tracked for up to 17 months each (881 locations) from January 1973 through August 1974 in the central Superior National Forest of NE Minnesota following a drastic decline in deer numbers. Ten vyolves (Canis lupus) from 7 packs in the same area were radiotracked before and/or during the same period (703 loca
Authors
R.L. Hoskinson, L. D. Mech
Aging immature mourning doves by primary feather molt
No abstract available.
Authors
G.H. Haas, S.R. Amend
Woodcock use of clearcut aspen areas in Wisconsin
Clearcut areas in northern Wisconsin aspen (Populus spp., mostly P. tremuloides) forests were highly attractive to woodcock (Philohela minor) for feeding and night-roosting, and made excellent sites for woodcock trapping and banding. Woodcock use of clearcuts was extended for several years by annually removing vegetation from trails with a bulldozer. A continued high demand for aspen pulpwood ma
Authors
J.B. Hale, L.E. Gregg
Population ecology of the mallard: VI. The effect of exploitation on survival
No abstract available.
Authors
David R. Anderson, Kenneth P. Burnham
Parasites and diseases of warmwater fishes
No abstract available.
Authors
Fred P. Meyer, Glenn L. Hoffman