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: 41763
Thickness of 1967-69 whooping crane eggshells compared to that of pre-1910 specimens
Table 1 summarizes measurements of pre-1910 Whooping Crane (Grus americana) eggshells obtained from 10 North American museums and private egg collections. They include 30 eggs from Iowa, 5 from North Dakota, 13 from Manitoba, and 2 each from Saskatchewan and Alberta; 11 of the eggs were classified as subelliptical and 41 as oval according to the shapes described by Palmer (1962: 13). Mean clutch s
Authors
Daniel W. Anderson, J.F. Kreitzer
Eggshell thinning in the brown pelican: Implication of DDE
No abstract available.
Authors
L. J. Blus, R.G. Heath, C.D. Gish, A. A. Belisle, R. M. Prouty
The occurrence and significance of polychlorinated biphenyls in the environment
SUMMARY: Polychlorinated biphenyls constitute a group of chlorine-bearing compounds of industrial origin that have permeated the natural environment throughout the world. Their chemical structure resembles that of some of the organochlorine pesticides. They are troublesome interferences in gas chromatographic analysis of these pesticides. Although methods have been developed to overcome an
Authors
E. H. Dustman, L. F. Stickel, L. J. Blus, W. L. Reichel, Stanley N. Wiemeyer
Eggshell thickness in mourning dove populations
Eggs (n = 452) of the mourning dove (Zenaidura macroura) were collected from 9 states in 1969 and 11 states in 1970, and shell thickness was compared with that of eggs (n = 97) collected from 24 states during the years 1861 to 1935. Mean shell thickness did not differ significantly in the test groups.
Authors
J.F. Kreitzer
Some patterns of woodcock activities on Maine summer fields
Certain aspects of woodcock usage of summer fields were studied in Maine. Findings were as follows: ....1. On two study fields in 1968, numbers of woodcock first began spending nights in the fields during the second week of June. During 1968 and 1969, the number of birds flushed from the fields varied greatly between nights. Use of fields continued into the first week of November......2. Woodcock
Authors
W.B. Krohn
Disappearance and persistence of aldrin after five annual applications
Investigation was initiated in 1965 to ascertain the disappearance rate of aldrin applied on loam soils at the recommended level of 1.5 lb per acre from 1960 through 1964. There was no further application of pesticides. Sampling began in 1965 and extended into 1970. Data from gas chromatographic analyses of soil and earthworm samples, collected spring and fall, showed that more than 95 percent
Authors
L.J. Korschgen
A new stratification of mourning dove call-count routes
The mourning dove (Zenaidura macroura) call-count survey is a nationwide audio-census of breeding mourning doves. Recent analyses of the call-count routes have utilized a stratification based upon physiographic regions of the United States. An analysis of 5 years of call-count data, based upon stratification using potential natural vegetation, has demonstrated that this uew stratification result
Authors
L. H. Blankenship, A.B. Humphrey, D. MacDonald
Unusual drowning in captive short-tailed shrews
Three captive short-tailed shrews (Blarina brevicauda) drowned in attempting underwater escapes from their cages.
Authors
Lawrence J. Blus
Annual adult survival rates of blackbirds and starlings
No abstract available.
Authors
D. P. Fankhauser
Prevalence of Sarcocystis in grackles in Maryland
One hundred and fifty-nine grackles (Quiscalus Quiscula) in Maryland were examined grossly and microscopically for Sarcocystis sp. Of 98 mature birds, 91 had Sarcocystis. None of 51 juvenile birds and none of 10 birds hatched in the laboratory had Sarcocystis. More mature females had Sarcocystis than did mature males. However, the number of intramuscular cysts (per bird) was greater in male
Authors
R. Fayer, R. M. Kocan