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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
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Introduction and summary: Chlorinated hydrocarbons as a factor in the reproduction and survival of lake trout (Salvelinus namaycush) in Lake Michigan Introduction and summary: Chlorinated hydrocarbons as a factor in the reproduction and survival of lake trout (Salvelinus namaycush) in Lake Michigan
Although lake trout (Salvelinus namaycush) were considered extinct in Lake Michigan by the mid 1950's, control of the parasitic sea lamprey (Petromyzon marinus) and extensive restocking resulted in an abundance of hatchery-produced lake trout in the lake by the early 1970's. However, no naturally produced yearling or older lake trout have been found in the lake during nearly a decade of...
Authors
Wayne A. Willford, Roger A. Bergstedt, William H. Berlin, Neal R. Foster, Robert J. Hesselberg, Michael J. Mac, Dora R. May Passino, Robert E. Reinert, Donald V. Rottiers
Introductory Remarks: Species variability Introductory Remarks: Species variability
No abstract available.
Authors
C. B. Kepler
Length of count period as a possible source of bias in estimating bird densities Length of count period as a possible source of bias in estimating bird densities
No abstract available.
Authors
J. M. Scott, F. L. Ramsey
Magnetics: 2-D anomaly Magnetics: 2-D anomaly
No abstract available.
Authors
D. L. Campbell, Donald N. Haines
Management and research opportunities with urban wildlife Management and research opportunities with urban wildlife
No abstract available.
Authors
A. D. Geis
Metals and terrestrial earthworms (Annelida: Oligochaeta) Metals and terrestrial earthworms (Annelida: Oligochaeta)
The toxicity of metals to earthworms and the residues of metals found in earthworms are reviewed. Meta 1 concentrations are rarely high enough to be toxic to worms, but copper may reduce populations in orchards heavily treated with fungicides and in soil contaminated with pig wastes. The metals in some industrial sewage sludges may interfere with using sludge in vermiculture. Storage...
Authors
W. N. Beyer
Methods for determining the tolerance of fishes to environmental stressors Methods for determining the tolerance of fishes to environmental stressors
No abstract available.
Authors
Gary Wedemeyer, D. McLeay
Methods for keeping birds in captivity. [Panel discussion] Methods for keeping birds in captivity. [Panel discussion]
No abstract available.
Authors
W. Crawford, R. Sarson, Stanley N. Wiemeyer, G. Geddes, T. Dunstan
Methods of detecting and counting raptors: A review Methods of detecting and counting raptors: A review
Most raptors are wide-ranging, secretive, and occur at relatively low densities. These factors, in conjunction with the nocturnal activity of owls, cause the counting of raptors by most standard census and survey efforts to be very time consuming and expensive. This paper reviews the most common methods of detecting and counting raptors. It is hoped that it will be of use to the ever...
Authors
M.R. Fuller, J. A. Mosher
MT planewave--horizontal layer MT planewave--horizontal layer
No abstract available.
Authors
Raymond D. Watts, D. L. Campbell
Neoplasia and other disease problems in black-footed ferrets: Implications for an endangered species Neoplasia and other disease problems in black-footed ferrets: Implications for an endangered species
No abstract available.
Authors
J. W. Carpenter, M.N. Novilla, H.E. Kaiser
Nutritionally-related diseases of captive-reared cranes and ratites Nutritionally-related diseases of captive-reared cranes and ratites
No abstract available.
Authors
John A. Serafin