Methylmercury: Second-year feeding effects on mallard reproduction and duckling behavior
G. H. Heinz
1976, Journal of Wildlife Management (40) 82-90
For 2 consecutive years mallard (Anas platyrhynchos) hens were fed a control diet or a diet that contained 0.5 or 3 ppm mercury as methylmercury (about 0.1 and 0.6 ppm mercury on the basis of a natural succulent diet). During the fifth egg-collection period, levels of mercury in eggs of...
Elevated heptachlor epoxide and DDE residues in a merlin that died after migrating
Charles J. Henny, J. R. Bean, R.W. Fyfe
1976, Canadian Field-Naturalist (90) 361-363
No abstract available....
Behavior of mallard ducklings from parents fed 3 ppm DDE
G. H. Heinz
1976, Bulletin of Environmental Contamination and Toxicology (16) 640-645
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...
Delta-aminolevulinic acid dehydratase: Inhibition in ducks dosed with lead shot
M. T. Finley, M. P. Dieter, L. N. Locke
1976, Environmental Research (12) 243-249
Lead concentration in blood and erythrocyte delta-aminolevulinic acid dehydratase (ALAD) activity was measured in mallard ducks dosed with one all-lead shot or one lead-iron combination shot. For 2 weeks after dosage, lead in blood of ducks given an all-lead shot was fourfold higher than in those dosed with lead-iron shot....
The 1975 North American peregrine falcon survey: Arizona
D. H. Ellis
1976, Canadian Field-Naturalist (90) 268
No abstract available....
Woodcock use of clearcut aspen areas in Wisconsin
J.B. Hale, L.E. Gregg
1976, Wildlife Society Bulletin (4) 111-115
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...
Lead in tissues of mallard ducks dosed with two types of lead shot
M. T. Finley, M. P. Dieter, L. N. Locke
1976, Bulletin of Environmental Contamination and Toxicology (16) 261-269
Mallard ducks (Anas platyrhynchos) were sacrificed one month after ingesting one number 4 all-lead shot or one number 4 lead-iron shot. Livers, kidneys, blood, wingbones, and eggs were analyzed for lead by atomic absorption. Necropsy of sacrificed ducks failed to reveal any of the tissue lesions usually associated with lead...
Methylmercury: Second generation reproductive and behavioral effects of mallard ducks
G. H. Heinz
1976, Journal of Wildlife Management (40) 710-715
Mallard ducks (Anas platyrhynchos) whose parents were fed a diet containing 0.5 ppm mercury (equal to about 0.1 ppm mercury in a natural diet) also were fed a diet containing 0.5 ppm mercury beginning at 9 days of age and continuing through their reproductive season. Mercury in the eggs of...
The effects of orchard pesticide applications on breeding robins
E.V. Johnson, G.L. Mack, D.Q. Thompson
1976, The Wilson Bulletin (88) 16-35
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...
White-tailed deer migration and its role in wolf predation
R.L. Hoskinson, L.D. Mech
1976, Journal of Wildlife Management (40) 429-441
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...
Brain lesions in mallard ducklings from parents fed methylmercury
G. H. Heinz, L. N. Locke
1976, Avian Diseases (20) 9-17
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,...
Aging immature mourning doves by primary feather molt
G.H. Haas, S.R. Amend
1976, Journal of Wildlife Management (40) 575-578
This study was undertaken to document the timing of primary feather molt for aging purposes and to examine variability in rate of molt between years and between sexes of immature wild mourning doves (Zenaida macroura). We used capture records from a 7-year study on the Piedmont and Coastal Plain of...
Reproductive rate and temporal spacing of nesting of red-winged blackbirds in upland habitat
Richard A. Dolbeer
1976, The Auk (93) 343-355
The literature contains numerous studies on Red-winged Blackbird (Agelaius phoeniceus) reproduction. Francis (1971) summarized eight studies dealing with nesting success. These and other studies have also provided information on breeding chronology, clutch sizes, sex ratios, survival rates for eggs and nestlings, reproductive physiology, and other life history aspects of reproduction....
Organochlorine residues and reproduction in the big brown bat
D. R. Clark Jr., T. G. Lamont
1976, Journal of Wildlife Management (40) 249-254
Twenty-six pregnant big brown bats (Eptesicus fuscus) were collected at Montpelier Barn, Laurel, Maryland, and kept in individual cages until parturition. Seven young in 5 litters were born dead; 21 litters contained only living young. Polychlorinated bipbenyl (PCB, Aroclor 1260) crossed the placenta two to three times more readily than...
Organochlorine residues in females and nursing young of the big brown bat (Eptesicus fuscus)
D. R. Clark Jr., T. G. Lamont
1976, Bulletin of Environmental Contamination and Toxicology (15) 1-8
Carcasses and brains of 18 big brown bats from Gaithersburg, Maryland, were analyzed for residues of organochlorine insecticides and PCB's. Eleven bats were adult females, and six of these had seven nursing young associated with them....Young bats resembled their parents in microgram amounts of PCB and DDE present in carcasses....
Organochlorine residues in three bat species from four localities in Maryland and West Virginia, 1973
D. R. Clark Jr., R. M. Prouty
1976, Pesticides Monitoring Journal (10) 44-53
In 1973, 119 bats of three species were collected from four localities in Maryland and West Virginia. The collection included 43 big brown bats (Eptesicus fuscus), 43 little brown brown bats (Myotis lucifugus), and 33 eastern pipistrelles (Pipistrellus subflavus). The bats were collected from Round Top Mountain, Washington Co., Md.;...
Acute oral toxicity and tissue residues of thallium sulfate in golden eagles, Aquila chrysaetos
J. R. Bean, R. H. Hudson
1976, Bulletin of Environmental Contamination and Toxicology (15) 118-121
No abstract available....
Dynamics of storage of organochlorine pollutants in herring gulls
D. W. Anderson, J.J. Hickey
1976, Environmental Pollution (10) 183-200
Several organochlorine pollutants were studied over the period of one annual cycle in caged juvenile and wild-collected adult herring gulls (Lagus argentatus) from Lake Michigan. Fish, mostly alewives (Alosa pseudoharengus), comprised the major year-round food items in the wild; alewives were also fed to the caged juveniles. Fish residues averaged...
The Maryland Christmas counts of 1975
D. Bystrak
1976, Maryland Birdlife (32) 12-14
The seventy-sixth Audubon Christmas bird count. Delaware, Maryland, D.C., Virginia
D. Bystrak
1976, American Birds (30) 167-168
Gray-backed tern eats lizards
R. B. Clapp
1976, The Wilson Bulletin (88) 354
Extation
R.C. Banks
1976, Science (191) 1217 + 129
Reflective plate glass--a hazard to migrating birds
R.C. Banks
1976, BioScience (26) 414-414
No abstract available. ...
Mathematical models for non-parametric inferences from line transect data
K.P. Burnham, David R. Anderson
1976, Biometrics (32) 325-336
A general mathematical theory of line transects is developed which supplies a framework for nonparametric density estimation based on either right angle or sighting distances. The probability of observing a point given its right angle distance (y) from the line is generalized to an arbitrary function g(y). Given only...
Fatal vaccine-induced canine distemper virus infection in black-footed ferrets
J. W. Carpenter, M.J.G. Appel, R.C. Erickson, M.N. Novilla
1976, Journal of the American Veterinary Medical Association (169) 961-964
Four black-footed ferrets that were live-trapped in South Dakota and transported to the Patuxent Wildlife Research Center died within 21 days after vaccination with modified live canine distemper virus. Immunofluorescence, European ferret inoculation, virus isolation attempts, and serum-neutralization tests indicated insufficient attenuation of the vaccine for this species....
