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
Hawk migration over White Marsh, Maryland
The average number of hawks observed per hour in autumn migration between 1951-1954 and 1958-1961 at White Marsh, Maryland, was compared. The counts indicated that the status of the ten species observed may be divided into three categories: (1) relatively stable species (red-tailed hawk), (2) declining species (sparrow hawk, red-shouldered hawk, osprey, marsh hawk, and broad-winged hawk), and (3)
Authors
C.D. Hackman, C. J. Henny
Population ecology of the great blue heron with special reference to western Oregon
Great Blue Heron (Ardea herodias) begin nesting in western Oregon about 1 month earlier than reported from the Philadelphia region and about 2 months earlier than reported from Southern Alberta. The number of young fledged per nesting pair in Oregon was 2.04 in 1970 which was nearly identical to the 1.91 believed necessary to maintain a stable population in the northern United States. The level of
Authors
C. J. Henny, M.R. Bethers
Effects of introducing foxes and raccoons on herring gull colonies
Red foxes (Vulpes fulva) and raccoons (Procyon lotor) released at colonies of herring gulls (Larus argentatus) on islands off the Massachusetts coast effectively eliminated the production of young gulls. Annual predator introductions for 2-4 years caused major reductions in colony size and occasionally total abandonment of the island as a colony site. Observations of the experimental islands for
Authors
J.A. Kadlec
Distribution of the fiddler crab (Uca minax) in relation to marsh plants within a Virginia estuary
The distribution and abundance of the red-jointed fiddler crab, Uca minax, was related to the distribution of marsh plants within a Virginia estuary. The crab was found in association with 15 species of marsh phanerogams, occurring with five plant species more than 20 percent of the time. These plants were Spartina alterniflora, Scirpus robustus, Distichlis spicata, Spartina patens, and Spartina c
Authors
J.A. Kerwin
The bufflehead (Bucephala albeola): A new host record for Plasmodium
No abstract available.
Authors
R. M. Kocan, J. O. Knisley
Synecology of a Virginia salt marsh
In the spring and summer of 1964 a salt marsh in Gloucester County, Virginia, was analyzed using random quadrat sampling. Synthetic treatments were employed to evaluate data and were correlated with observed differences in elevation. Floristic data indicate the Virginia salt marshes show closer similarity to marshes north of Chesapeake Bay than those south of Chesapeake Bay. Correlation of florist
Authors
J.A. Kerwin, R. Pedigo
The white-crowned pigeon: A fruit-eating pigeon as a host for Trichomonas gallinae
Trichomoniasis resulting from infection by Trichomonas gallinae was observed in 12 laboratory reared white-crowned pigeons (Columba leucocephala). A field survey of nestlings in the Florida Keys revealed a prevalence of 88% T. gallinae carriers but no evidence of trichomoniasis could be found among the wild birds.
Authors
R. M. Kocan, A. Sprunt
Thirty-fifth breeding-bird census. 47. Powerline right-of-way
No abstract available.
Authors
J. R. Longcore
Conditioning black ducks to nest in elevated cylinders
No abstract available.
Authors
F. B. McGilvrey