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: 41778
Organochlorine pollutants and population status of least terns in South Carolina
Least Tern nesting colonies on the Cape Romain National Wildlife Refuge and surrounding areas in South Carolina were studied from 1971 through 1975. We located 10 colonies including 6 on the Refuge and 4 on nearby coastal islands. The number of nests in each colony ranged from several up to 220. Least Terns began reproductive activity in April, and the egg-laying period ranged from May to July. Th
Authors
L. J. Blus, R. M. Prouty
Mercury residues in tissues of dead and surviving birds fed methylmercury
Concentrations of mercury in passerine birds fed diets containing 40 ppm methylmercury were similar in tissues of birds that died from mercury poisoning and in those that were sacrificed after half the group had died. Residues were higher in tissues of birds that died, but the differences were not statistically significant. Residue levels were highest in livers, followed by kidneys and brains. Le
Authors
Mack T. Finley, William H. Stickel, R. E. Christensen
Acute oral and percutaneous toxicity of pesticides to mallards: Correlations with mammalian toxicity data
Acute oral (po) and 24-hr percutaneous (perc) LD50 values for 21 common pesticides (19 anticholinesterases, of which 18 were organophosphates, and one was a carbamate; one was an organochlorine central nervous system stimulant; and one was an organonitrogen pneumotoxicant) were determined in mallards (Anas platyrhynchos). Three of the pesticides tested were more toxic percutaneously than orally. A
Authors
R. H. Hudson, M. A. Haegele, R. K. Tucker
Evaluation of methodology used in ecological characterization of the Chenier Plain
No abstract available.
Authors
R. H. Chabreck, J. B. Johnston, James B. Kirkwood
Short-tailed shrews: Toxicity and residue relationships of DDT, dieldrin, and endrin
Experiments involving dietary toxicity and residue relationships of DDT, dieldrin, and endrin were conducted with short-tailed shrews. Dietary concentrations of DDT dissolved in vegetable oils were usually more toxic than diets containing comparable amounts of powdered DDT. Younger shrews, particularly females, were more tolerant of powdered DDT than older animals; yet, there were no conspicuous a
Authors
Lawrence J. Blus
Sleeping distance in wolf pairs in relation to the breeding season
Changes in sleeping distances in 11 pairs of wild wolves (Canis lupus) were studied to determine if they correlated with stages of the breeding cycle. Aerial radio-tracking and observation were the techniques used. Members of most pairs slept less than 1 m apart at least sometime during proestrus and the first half of the breeding season, but slept farther apart during the second half and after br
Authors
L. David Mech, Steven T. Knick
Climate and reproduction of grizzly bears in Yellowstone National Park
Controversy surrounds the conflicts between the requirements of human safety and the preservation of grizzly bears (Ursus arctos horribilis) in western North America. It has been difficult to separate the effect of factors such as the closure of garbage dumps from that of the climate. It has also proved difficult to relate climatic data to changes in the populations of large mammals. I report here
Authors
Harold D. Picton
Environmental pollutants and eggshell thinning in the black-crowned night heron
No abstract available.
Authors
H. M. Ohlendorf, E. E. Klaas, T. E. Kaiser
Death of a radio-marked grizzly
No abstract available.
Authors
A.L. Kolz, Larry J. Roop, Kenneth R. Greer
Efficacy of certain disinfectants against infectious pancreatic necrosis virus
The virucidal properties of iodophor, chlorine (sodium hypochlorite), formalin, thimerosal (organic mercurial compound), malachite green, and acriflavine were tested on infectious pancreatic necrosis virus (IPNV). Iodine and chlorine showed good activity, but efficacy depended on the concentration of virus, the presence of organic matter (calf serum), and water pH. Water hardness (0-300 mg 1−1 as
Authors
Diane G. Elliott, Donald F. Amend