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: 41920
Conservation committee report. Falconry: Effects on raptor populations and management in North America
The art of falconry in North America, practiced by a few individuals for many years, attracted little attention until the 1960?s. Presently about 2800 falconers are licensed in the United States with less than one half considered to be active. While interest in this art is expected to increase, we believe growth will be slow, probably 5 to 10% per year, due to rigorous demands on time and equipmen
Authors
C.E. Braun, J.H. Enderson, C. J. Henny, H. Meng, A.G. Nye
A population analysis of two species of streamside salamanders, genus Desmognathus
Desmognathus fuscus and Desmognathus ochrophaeus mere studied over a 6-wk period by mark-recapture and removal methods. Density is ~. 0.8/m2 in D. fuscus and 0.6 - l.l/m2 in D. ochrophaeus; respective biomass densities are 1.5 and 1.0 g/m2. Adjusted estimates indicate a greater proportion of adults in D. ochrophaeus. The observed sex ratio is unbalanced in favor of males but may be close to 1:1 in
Authors
R.J. Hall
Woodcock nesting habitat in northern Wisconsin
Of 32 woodcock nests studied in northern Wisconsin, 29 were in forest stands dominated by aspen, and 3 were in northern hardwoods. Well-drained, upland nest sites near the brushy edges of poorly stocked poletimber stands were apparently preferred. More than 30 woody plant species were found at the 32 nest sites. Hazel was the most important shrub species noted.
Authors
L.E. Gregg, J.B. Hale
Aggression of foraging migrant semipalmated sandpiper
No abstract available.
Authors
B. A. Harrington, S. Groves
California ospreys begin incubation at a frozen mountain lake
No abstract available.
Authors
C. J. Henny
Ruptured-yolk peritonitis and organochlorine residues in a royal tern
Ruptured-yolk peritonitis was responsible for the death of a royal tern. Lodgment of eggs in the oviduct was probably due to reverse peristalsis brought about by breakage of the thin-shelled eggs and secondary bacterial infection. The thin shells were apparently not related to the low levels of DDE and other organochlorine pollutants found in tissues and egg contents.
Authors
L. J. Blus, L. N. Locke, C. J. Stafford
Residues of organochlorines and heavy metals in tissues and eggs of brown pelicans, 1969-73
Shells of brown pelican (Pelecanus occidentalis) eggs collected in South Carolina from 1969 through 1973 were significantly thinner than shells of those collected before 1947. Residues of 10 organochlorine pollutants and 10 heavy metals were found in these eggs. Total organochlorine residues were apparently magnified 23 times from fish to pelican eggs, but interpretation of biomagnification was co
Authors
L. J. Blus, B.S. Neely, T. G. Lamont, B. M. Mulhern
Reduction in courtship behavior induced by DDE in male ringed turtle doves
The effects of p,p?-DDE on the intensity of male Ringed Turtle Doves? courtship behavior were determined for dietary levels of 10 ppm and 50 ppm (dry weight). Pairs of doves were placed in cages for 12.5 min on 5 consecutive days for behavioral observation before dietary treatment and for periods 31-35 and 5963 days after initiation of the treated diet. Total amount of time spent displaying courts
Authors
M. A. Haegele, R. H. Hudson
Birds of prey, DDT, and tussock moths in Pacific Northwest
No abstract available.
Authors
C. J. Henny
Residues in common flicker and mountain bluebird eggs one year after a DDT application
Common flicker (Colaptes auratus) and mountain bluebird (Sialia currucoides) eggs were examined 1 year after DDT application and showed a marked difference. Residue levels in mountain bluebird eggs were approximately 10 times higher than in common flicker eggs (5.29 to 0.58 ppm wet weight). These differences can be explained by disparate dietary habits. The mean level in American kestrel (Falco sp
Authors
C. J. Henny, R.A. Olson, D. L. Meeker
Reproductivity of Japanese quail fed mercuric chloride in the absence of vitamin D
Mercuric chloride (HgCl2) was tested at 16 p.p.m. Hg for vitamin D sparing activity by presenting it dietarily in the presence and absence of 25-hydroxycholecalciferol (25-HCC) to Japanese quail (Coturnix c. japonica) for 25 days. No gross signs characteristic of mercury poisoning were observed, but some predictable effects of vitamin D deficiency on avian reproduction were manifested within 10 da
Authors
E. F. Hill, J. H. Soares