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Page 6403, results 160051 - 160075

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Head-scratching method of the Swainson's warbler
Brooke Meanley
1970, The Auk (87) 163-163
Ficken and Ficken (Auk, 85: 136, 1968) suggest that the "Head-scratching method may prove a valuable addition to the set of complex characters that can be used in defining genera," and that field observers should continue to fill gaps in our knowledge of this behavior. In the course of a...
Oological data on egg and breeding characteristics of brown pelicans
D. W. Anderson, J.J. Hickey
1970, The Wilson Bulletin (82) 14-28
Mean clutch size in 236 sets of North American Brown Pelican eggs was 2.95 and did not vary geographically between North American populations. Shell weight varied from 8.05 g to 10.99 g along a geographic continuum. Shell thickness averaged 0.510 mm for P&cams occidentalis occidentalis, 0.5544557 mm for P. IJ....
Molt and taxonomy of red-breasted nuthatches
Richard C. Banks
1970, The Wilson Bulletin (82) 201-205
The postnuptial and postjuvenal molts of Red-breasted Nuthatches occur from middle June to late September. Some birds may be nearly finished with the complete molt before other individuals begin, so that specimens taken at any given time may differ by as much as two months in the age of their...
Surfactants as blackbird stressing agents
P.W. Lefebvre, J.L. Seubert
1970, Proceedings of the Vertebrate Pest Conference (4) 156-161
Applications of wetting-agent solutions produce mortality in birds. The exact cause of death is undetermined but it is believed that destruction of the insulating qualities of the plumage permits ambient cold temperatures and evaporation to lower the body temperature to a lethal level. The original concept of using these materials...
Two species of Simuliidae (Diptera), Cnephia ornithophilia and Prosimulium vernale, from Maryland
I.B. Tarshis, J.N. Stuht
1970, Annals of the Entomological Society of America (63) 587-590
The finding of Cnephia ornithophilia Davies, Peterson, & Wood and Prosimulium vernale Shewell for the first time at the Patuxent Wildlife Research Center, Laurel, Maryland, is described. Larvae of C. ornithophilia were collected Nov. 15, pupae Feb. 14, and adult flies Feb. 28. No immature or adult specimens were found between Apr. 2 and Nov. 14....
Organochlorine and heavy metal residues in bald eagle eggs
W.C. Krantz, B.M. Mulhern, George E. Bagley, A. Sprunt IV, F.J. Ligas, W.B. Robertson Jr.
1970, Pesticides Monitoring Journal (4) 136-140
Bald eagle eggs collected in 1968 from nests in Wisconsin, Maine, and Florida all contained residues of DDE, DDD, dieldrin, heptachlor epoxide, and polychlorinated biphenyls. Many also contained traces of DDT. Eggs from five nonproductive nests sampled in Maine contained much higher residues than did eggs collected from...
Disease
C. M. Herman
Herbert H. Dill, Forrest B. Lee, editor(s)
1970, Book chapter, Home Grown Honkers
DDE and DDD residues correlated with mortality of experimental birds
William H. Stickel, Lucille F. Stickel, Francis B. Coon
William B. Deichmann, Rafael A. Penalver, Jack L. Radomski, editor(s)
1970, Conference Paper, Pesticides symposia: Collection of papers presented at the 6th -7th Inter-American Conferences on Toxicology and Occupational Medicine, University of Miami School of Medicine, Miami
Nearly everywhere in nature are found DDE and DDD, which are metabolites of DDT, and they often become concentrated through food chains. DDD is also a commercial insecticide. large amounts of both are frequently found in birds, but the significance of these amounts has puzzled many owrkers. Studies at Clear...
The thin eggshell problem
L.F. Stickel, L.I. Rhodes
J.W. Gillett, editor(s)
1970, Book chapter, Proceedings of the symposium, the biological impact of pesticides in the environment
It has long been known that DDT and related chemicals can impair the reproduction of birds. In early years of organochlorine pesticide use, widespread mortality occurred immediately following heavy applications of these chemicals, and survivors contained substantial amounts of toxicant in their tissues. Repopulation from untreated areas tended...