Publications
This list of publications includes peer-review journal articles, official USGS publications series, reports and more authored by scientists in the Ecosystems Mission Area. A database of all USGS publications, with advanced search features, can be accessed at the USGS Publications Warehouse.
Filter Total Items: 41778
Molt and taxonomy of red-breasted nuthatches
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 plumage. No characters useful in ageing birds after the completion of the autumn molt were found.....The p
Authors
R.C. Banks
Oological data on egg and breeding characteristics of brown pelicans
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. carolinensis, and 0.569- 0.579 mm for P. o. cdifornicus. The ranges of breeding dates fo
Authors
D. W. Anderson, J.J. Hickey
Correction of bias in belt transect studies of immotile objects
Unless a correction is made, population estimates derived from a sample of belt transects will be biased if a fraction of, the individuals on the sample transects are not counted. An approach, useful for correcting this bias when sampling immotile populations using transects of a fixed width, is presented. The method assumes that a searcher's ability to find objects near the center of the transe
Authors
D.R. Anderson, R.S. Pospahala
Surfactants as blackbird stressing agents
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 as bird-control tools was developed in 1958 at the Patuxent Wildlif
Authors
P.W. Lefebvre, J.L. Seubert
Progress of primary feather molt of adult mourning doves in Missouri
The examination of 7,892 adult doves in Missouri between 1953 and 1965 showed that less than 2.5% of adult doves completed their molt before October 1. Adult doves of both sexes began molting their primary feathers during early June in Missouri and lost the last (tenth) primary during the latter half of October. Approximately 140-150 days were required to complete the molt. Thus, early-hatched
Authors
K.C. Sadler, R. E. Tomlinson, H. M. Wight
[Book review] 'Biological Effects of Pesticides in Mammalian Systems,' edited by Herman F. Kraybill
No abstract available.
Authors
L. J. Blus
[Book review] Diseases in Free Living Wild Animals, A. McDiarmid (ed). Academic Press, New York
No abstract available.
Authors
R. M. Kocan
Organochlorine and heavy metal residues in bald eagle eggs
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 either productive or nonproductive nests in Wisconsin and Florida.
Authors
W.C. Krantz, B. M. Mulhern, George E. Bagley, A. Sprunt, F.J. Ligas, W.B. Robertson