Publications
This is a list of publications written by Patuxent employees since Patuxent opened in 1939. To search for Patuxent's publications by author or title, please click below to go to the USGS Publication Warehouse.
Filter Total Items: 8128
Raptor road surveys in South America Raptor road surveys in South America
Twenty-six (23 traveling and three point) raptor roadside surveys were conducted during a 29,000 km expedition through nine nations of South America. During roadside surveys, we tallied 41 of the 87 (47%) diurnal raptor species (including vultures) that occur in South America. The number of species observed per route varied from 17 in the wet savanna of Venezuela to only two species...
Authors
D. H. Ellis, R.L. Glinski, D.G. Smith
Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons Egg size and laying order of snowy egrets, great egrets, and black-crowned night-herons
The nesting biology of the family Ardeidae (bitterns, herons, and egrets) has been intensively studied (e.g., Owen 1960, Milstein et al. 1970, Werschkul 1979), but egg size in relation to laying order bas not received attention. The last egg laid in gull and tern clutches is generally smaller than preceding eggs (e.g., Parsons 1970, Nisbet 1978). The relative size of the final egg in a...
Authors
T. W. Custer, P. C. Frederick
Dicofol (Kelthane®)-induced eggshell thinning in captive american kestrels Dicofol (Kelthane®)-induced eggshell thinning in captive american kestrels
Reproductive parameters of American kestrels (Falco sparverius) were measured through two breeding seasons. Exposure to Kelthane® (containing no DDT-related compounds) at dietary concentrations of 0 (control), 1,3, 10 and 30 μg/g (wet weight) began in late November before, and continued through, the second season. Kelthane thinned eggshells and lowered the thickness index at dietary...
Authors
D. R. Clark, J. W. Spann, C.M. Bunck
Birds of Islas Beata and Alto Velo, Dominican Republic Birds of Islas Beata and Alto Velo, Dominican Republic
Isla Beata and Isla Alto Velo are small satellites of the Dominican Republic, lying off its southwestern coast. We visited Isla Beata between 26–30 July 1977 and 20–21 October 1978. We explored Isla Alto Velo on 22 October 1978. In addition we made aerial surveys of the islands in 1977 and 1980. In our surveys we found 34 species, including 16 land birds, not before reported for Isla...
Authors
J. W. Wiley, J. A. Ottenwalder
Abundance and habitat use of reptiles on Rota, Mariana Islands Abundance and habitat use of reptiles on Rota, Mariana Islands
No abstract available.
Authors
G.J. Wiles, G.H. Rodda, T. H. Fritts, E.M. Taisacan
North American Breeding Bird Survey Annual Summary, 1989 North American Breeding Bird Survey Annual Summary, 1989
The North American Breeding Bird Survey (BBS) is run by approximately 2,000 skilled amateur ornithologists and is coordinated cooperatively by the U.S. Fish and Wildlife Service and the Canadian Wildlife Service. Since 1966, BBS cooperators have been collecting standardized information on North American bird populations. The BBS is a roadside survey, comprised of permanent routes that...
Authors
Sam Droege, J.R. Sauer
Viable populations Viable populations
No abstract available.
Authors
P. A. Buckley, W. Ehorn, M. Gilpin, J. Hamrick, C. Schonewald-Cox, M. Shaffer, T. Simons
Setting objectives -- A prerequisite of ecosystem management Setting objectives -- A prerequisite of ecosystem management
No abstract available.
Authors
R.L. Schroeder, M.E. Keller
Wood duck population trends from the North American Breeding Bird Survey Wood duck population trends from the North American Breeding Bird Survey
The North American Breeding Bird Survey (BBS) has been conducted yearly since 1966, and can be used to describe relative population density and trends of birds in North America north of Mexico. Wood ducks (Air sponsa) are difficult to survey using conventional waterfowl monitoring techniques, but a large portion of their range is surveyed by the BBS. Wood ducks are detected at low...
Authors
J.R. Sauer, Sam Droege
Estimation of annual indices from roadside surveys Estimation of annual indices from roadside surveys
Most of the surveys presently used to estimate population trends on a large geographic scale depend upon repeated visits to a number of randomly selected routes or monitoring points. As these surveys cannot be analyzed by modeling annual mean densities among routes within a region, no natural annual index of population density exists for the region. We discuss two possible methodologies...
Authors
J.R. Sauer, P.H. Geissler
Geographic distribution of Micronycteris schmidtorum Sanborn (Chiroptera: Phyllostomidae) Geographic distribution of Micronycteris schmidtorum Sanborn (Chiroptera: Phyllostomidae)
No abstract available.
Authors
C.E. Ascorra, D.E. Wilson, A. L. Gardner
Toxicity of parathion to captive european starlings (Sturnus vulgaris) — Absence of seasonal effects Toxicity of parathion to captive european starlings (Sturnus vulgaris) — Absence of seasonal effects
The effects of season on the toxicity of the prototypic organophosphorus insecticide parathion was evaluated using adult European starlings (Sturnus vulgaris) housed in outdoor pens. Groups of birds received oral doses of parathion in the fall, winter, spring and summer. Median lethal dosage, and brain and plasma cholinesterase inhibition, were found to be quite similar among seasons...
Authors
Barnett A. Rattner, C.E. Grue