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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.
Filter Total Items: 6155
Considerations for selecting fish production facilities Considerations for selecting fish production facilities
No abstract available at this time
Authors
N. C. Parker
Diagnostic brain residues of dieldrin: Some new insights Diagnostic brain residues of dieldrin: Some new insights
Forty adult male cowbirds were fed a diet containing 20 ppm dieldrin; 20 of the birds were randomly selected to die from dieldrin poisoning and 20 were sacrificed when dieldrin had made them too sick to eat. An average of 6.8 ppm dieldrin (range of 1.51 to 11.7) in the brain on a wet-weight basis was associated with a treatment-related cessation of feeding, whereas an average of 16.3 ppm...
Authors
G. H. Heinz, R.W. Johnson
Discriminant analysis in wildlife research: Theory and applications Discriminant analysis in wildlife research: Theory and applications
Discriminant analysis, a method of analyzing grouped multivariate data, is often used in ecological investigations. It has both a predictive and an explanatory function, the former aiming at classification of individuals of unknown group membership. The goal of the latter function is to exhibit group separation by means of linear transforms, and the corresponding method is called...
Authors
B. Kenneth Williams
Distance estimation as a variable in estimating bird numbers from vocalizations Distance estimation as a variable in estimating bird numbers from vocalizations
No abstract available.
Authors
J. M. Scott, F. L. Ramsey, C. B. Kepler
Effect of time of day on bird activity Effect of time of day on bird activity
Breeding season activity, based on detections recorded on more than a million 3. minute Breeding Bird Survey stops, reaches a peak for most species during the hour centered at sunrise or in the following hour. Activity of most species then declines gradually as the morning progresses. When large samples are considered, activity patterns for a given species are quite constant from year to...
Authors
C.S. Robbins
Effects of forest fragmentation on avifauna of the eastern deciduous forest Effects of forest fragmentation on avifauna of the eastern deciduous forest
No abstract available.
Authors
R.F. Whitcomb, C.S. Robbins, J.F. Lynch, B.L. Whitcomb, M. K. Klimkiewicz, D. Bystrak
Effects of number of circular plots on estimates of avian density and species richness Effects of number of circular plots on estimates of avian density and species richness
No abstract available.
Authors
M.L. Morrison, R.W. Mannan, G.L. Dorsey
Energy metabolism in fishes Energy metabolism in fishes
No abstract available at this time
Authors
R. R. Smith
Estimates of avian population trends from the North American Breeding Bird Survey Estimates of avian population trends from the North American Breeding Bird Survey
One of the major purposes of bird population studies is to document changes in population size over a period of years. The traditional method used in Europe and North America to detect population change is to calculate annual ratios. However, this method can produce spurious results when ratios are accumulated over many years. Consequently, new methods of computing trends are needed...
Authors
P.H. Geissler, B.R. Noon
Fish biologics at the National Fish Health Research Laboratory Fish biologics at the National Fish Health Research Laboratory
No abstract available at this time
Authors
O. W. Dixon, D. P. Anderson
Fish biologics: antisera for fish disease diagnosis Fish biologics: antisera for fish disease diagnosis
No abstract available at this time
Authors
D. P. Anderson, O. W. Dixon
Formalin preservation of avian blood for organochlorine analysis Formalin preservation of avian blood for organochlorine analysis
Blood biopsy for chemical analysis is a valuable technique for evaluating chemical exposure of birds in the wild without harming the birds. Field conditions, however, often make sample storage difficult. Better methods than freezing are needed to improve the interpretive value of chemical analysis of the sample. The use of formalin was explored for this purpose. A pooled sample of blood
Authors
C. J. Stafford, W. H. Stickel