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
Relation between male courtship activities and nesting of American woodcock
No abstract available.
Authors
A. D. Geis
What's being done about blackbird control at the Bureau of Sport Fisheries and Wildlife Research Center Eastern Branches?
No abstract available.
Authors
J.L. Seubert
Aging mourning doves by outer primary wear
Many immature mourning doves (Zenaidura macroura) cannot be aged by the conventional white-tipped primary covert method if molt has proceeded beyond the 7th primary. A new method of aging doves in this group is based on the presence (immature) or absence (adult) of a buff-colored fringe on the tips of the 9th and 10th primaries. Experienced biologists were nearly 100 percent accurate in aging wing
Authors
H. M. Wight, L. H. Blankenship, R. E. Tomlinson
Pesticide residues in the ecosystem
Pesticide residues have become a component of nearly all living organisms. Nearly all California birds and fish collected in a 1963 pesticide survey contained residues. Discovery of DDT and metabolites in Antarctic animals in 1964 pushed the distribution of pesticides to the remotest portions of the globe. Exchange of pesticides in the aquatic world progresses rapidly, even in the quiet waters of
Authors
E. H. Dustman, Lucille F. Stickel
The occurrence of Oestrus ovis L. (Diptera: Oestridae) in the bighorn sheep from Wyoming and Montana
Three previous and five new records of the domestic sheep bot, Oestrus ovis, from the bighorn sheep are given. The life history and descriptions of adult and larval forms are presented. The significance of the occurrence of the parasite in the abnormal host is discussed.
Authors
K.J. Capelle
Contamination of the freshwater ecosystem by pesticides
A large part of our disquieting present-day pesticide problem is intimately tied to the freshwater ecosystem. Economic poisons are used in so many types of terrain to control so many kinds of organisms that almost all lakes and streams are likely to be contaminated. In addition to accidental contamination many pesticides are deliberately applied directly to fresh waters for suppression of aquatic
Authors
Oliver B. Cope
Dechlorination of DDT by Aerobacter aerogenes
Dechlorination of DDT to DDD in higher animals requires the presence of molecular oxygen, but in microorganisms the presence of oxygen hinders dechlorination. In cell-free preparations of Aerobacter aerogenes, the use of selected metabolic inhibitors indicated that reduced Fe(II) cytochrome oxidase was responsible for DDT dechlorination. This finding may possibly explain. the persistence of DDT re
Authors
Gary Wedemeyer
The cytological course of experimental lymphocystis in the bluegill
No abstract available.
Authors
C.E. Dunbar, K. Wolf
Some blood chemistry values for five Chesapeake Bay area fishes
Blood samples from gizzard shad,largemouth bass, white perch, pumpkinseed, and
toadfish were analyzed for hemoglobin, total plasma protein, total plasma cholesterol, and ion
concentrations of plasma sodium, potassium, and chloride. The hemoglobin concentration and total plasma cholesterol found in a given species seem to have positive correlation with the customary activity level of that species
Authors
J. B. Hunn, P.F. Robinson