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Science Quality and Integrity
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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Bias of animal population trend estimates
A computer simulation study of the population trend estimator used for the Mourning Dove Call-Count Survey, Woodcock Singing Ground Survey, Breeding Bird Survey and other surveys concluded that the estimator had negligible bias in most situations but that observer covariables should not be used with less than five years of data. With rare species (e.g. two birds per route), at least five years sh
Authors
P.H. Geissler, W. A. Link
Bioassay for phytotoxicity of toxicants to sago pondweed
No abstract available.
Authors
W. J. Fleming, J.J. Momot, M.S. Ailstock
Comparisons of winter bird populations in extensive neotropical forest and in isolated fragments
No abstract available.
Authors
C.S. Robbins, B.A. Dowell, D.K. Dawson, R. Coates-Estrada, J. Colon, F. Espinoza, J. Rodriguez, R. Sutton, T. Vargas, Dieter Weyer
Crested caracara
The crested caracara's range extends from the southern United States south to Tierra del Fuego. Although the caracara has been recorded in all of the southwestern states, it occurs regularly only in southern Arizona and central, southern and coastal Texas. Its distribution is closely linked to the availability of carrion. Throughout its range, thecaracara is associated with open habitats such as d
Authors
D. H. Ellis, D.G. Smith, W.H. Whaley, Catherine H. Ellis
Dabbling duck harvest dynamics in the Central Valley of California--implications for recruitment
Age and sex ratios and body weights were obtained for northern pintails (Anas acuta), mallards (A. platyrhynchos), American wigeon (A. americana), green-winged teal (A. crecca), and northern shovelers (A. clypeata) shot at Mendota State Wildlife Area in the San Joaquin Valley (SANJV) and at Sacramento National Wildlife Refuge in the Sacramento Valley (SACV) during 1982-83 and 1983-84. Age ratios w
Authors
M. R. Miller, J. Beam, D.P. Connelly