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: 41771
Radiometric dates from Alaska: A 1975 compilation
The following table of radiometric dates from Alaska includes published material through 1972 as well as some selected later data. The table includes 726 mineral and whole-rock dates determined by the K-Ar, Rb-Sr, fission-track U-Pb, and Pb-alpha techniques.The data are organized in alphabetical order of the 1:250,000 scale quadrangles in which the dated rocks are located. The latitude and longitu
Authors
D. L. Turner, Donald Grybeck, Frederic H. Wilson
Radiometric age map of southcentral Alaska
This map includes published, thesis, and open-file radiometric data available to us as of June, 1975. Some dates are not plotted because of inadequate location data in the original references.The map is divided into five sections, based on 1:1,000,000 scale enlargements of the National Atlas maps of Alaska. Within each section (e.g., southeastern Alaska), radiometric dates are plotted and keyed to
Authors
Frederic H. Wilson, D. L. Turner
Radiometric age map of southwest Alaska
This map includes published, thesis, and open-file radiometric data available to us as of June, 1975. Some dates are not plotted because of inadequate location data in the original references.The map is divided into five sections, based on 1:1,000,000 scale enlargements of the National Atlas maps of Alaska. Within each section (e.g., southeastern Alaska), radiometric dates are plotted and keyed to
Authors
Frederic H. Wilson, D. L. Turner
Radiometric age map of Aleutian Islands
This map includes published, thesis, and open-file radiometric data available to us as of June, 1975. Some dates are not plotted because of inadequate location data in the original references.The map is divided into five sections, based on 1:1,000,000 scale enlargements of the National Atlas maps of Alaska. Within each section (e.g., southeastern Alaska), radiometric dates are plotted and keyed to
Authors
Frederic H. Wilson, D. L. Turner
Radiometric age map of southeast Alaska
This map includes published, thesis, and open-file radiometric data available to us as of June, 1975. Some dates are not plotted because of inadequate location data in the original references.The map is divided into five sections, based on 1:1,000,000 scale enlargements of the National Atlas maps of Alaska. Within each section (e.g., southeastern Alaska), radiometric dates are plotted and keyed to
Authors
Frederic H. Wilson, D. L. Turner
Optimal exploitation strategies for an animal population in a Markovian environment: A theory and an example
Optimal exploitation strategies were studied for an animal population in a Markovian (stochastic, serially correlated) environment. This is a general case and encompasses a number of important special cases as simplifications. Extensive empirical data on the Mallard (Anas platyrhynchos) were used as an example of general theory. The number of small ponds on the central breeding grounds was used as
Authors
David R. Anderson
Status of the wolf in Michigan, 1973
Wolf (Canis lupus) numbers in Michigan's Upper Peninsula declined from an estimated 45-50 animals in the mid-1950s to near extinction in 1973, probably because of overharvesting through the bounty system. Sporadic breeding and occasional immigration of wolves from Ontario and Minnesota are postulated to be the factors tending to maintain the present population at the level of perhaps six individua
Authors
J. Hendrickson, W. L. Robinson
Analysis of tissues of mallard ducks fed two phthalate esters
No abstract available.
Authors
A. A. Belisle, W. L. Reichel, J. W. Spann
The brown pelican and certain environmental pollutants in Louisiana
No abstract available.
Authors
L. J. Blus, T. Joanen, A. A. Belisle, R. M. Prouty
Effects of methylmercury on approach and avoidance behavior of mallard ducklings
Mallard ducks were fed a control diet or a diet containing 0.5 or 3 ppm mercury (as methylmercury dicyandiamide) based on the dry feed. These mercury diets are approximately equivalent to 0.1 and 0.6 ppm mercury in a natural succulent diet. I measured for the ducklings the approach behavior in response to a tape-recorded maternal call and the avoidance of a frightening stimulus....There were no si
Authors
G. H. Heinz
DDD poisoning in a loon and the identification of the hydroxylated form of DDD
No abstract available.
Authors
R. M. Prouty, J.E. Peterson, L. N. Locke, B. M. Mulhern
Cholinesterase (ChE) response and related mortality among birds fed ChE inhibitors
Patterns of mortality and inhibition of brain and plasma ChE in birds treated with ChE inhibitors were studied in an attempt to determine the validity of using ChE activity as a monitoring and diagnostic technique. Analysis of brain ChE activity proved to be reliable for diagnosing and monitoring effects of selected ChE inhibitors in birds. Brain ChE inhibition exceeding 20% indicated exposure, an
Authors
J. Larry Ludke, Elwood F. Hill, Michael P. Dieter