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Page 4929, results 123201 - 123225

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Photographic censusing of the 1982-1983 California condor population
N.F.R. Snyder, E.V. Johnson
1985, Condor (87) 1-13
An intensive census of the remnant California condor (G. californianus) population based on photographic identification of individuals revealed a minimum of 21 and a probable maximum of .apprx. 24 condors in late summer 1982. Corresponding figures for 1983 were 19 and 22 condors. Two condors are known to have died...
Interspecific competition among Hawaiian forest birds
Stephen Mountainspring, J. M. Scott
1985, Ecological Monographs (55) 219-239
The object of this study was to determine whether interspecific competition modified local geographic distribution, after taking into account the effect of habitat structure. The tendencies for 14 passerine birds to have positive or negative associations were examined, using 7861 sample points in seven native forests on the islands of...
Replacement-clutching and annual nesting of California condors
N.F.R. Snyder, J.A. Hamber
1985, Condor (87) 374-378
Observations since 1981 have conclusively documented the capacity of California Condors (Gymnogyps californianus) to lay replacement clutches within breeding seasons and to nest successfully on an annual basis. Deliberate encouragement of these capacities led to a better than three-fold increase in reproduction of the remnant population in 1983 and 1984....
A search for stability gradients in North American breeding bird communities
B.R. Noon, D.K. Dawson, J.P. Kelly
1985, The Auk (102) 64-81
To search for the existence of stability gradients in North American breeding land bird communities we operationally defined stability (after Jarvinen 1979) as year-to-year persistence in species composition and distribution of species abundances. From the census data for 174 study plots we derived nine indices that estimate the annual variability...
Environmental contamination in the oil fields of western Pennsylvania
P.H. Albers, A. A. Belisle, D. M. Swineford, R.J. Hall
1985, Oil and Petrochemical Pollution (2) 265-280
The effects on freshwater wildlife of chronic exposure to oil field discharges are not well known. Collections of wastewater, aquatic invertebrates, fish, salamanders, and small mammals were made in several streams in the oil fields of western Pennsylvania during 1980-81. Estimates of the petroleum content of two wastewater discharges were...
Mapping of forested wetland: Use of Seasat radar images to complement conventional sources
J.L. Place
1985, Professional Geographer (37) 463-469
Distinguishing forested wetland from dry forest using aerial photographs is handicapped because photographs often do not reveal the presence of water below tree canopies. Radar images obtained by the Seasat satellite reveal forested wetland as highly reflective patterns on the coastal plain between Maryland and Florida. Seasat radar images may...
An overview of raptor biology and conservation in Latin America
D. H. Ellis
1985, Book chapter, Raptor Research Foundation Symposium on the Management of Birds of Prey. International Meeting. Session 7. Western Hemisphere Meeting of the World Working Group on Birds of Prey.
Prior to the last decade, biological studies of raptorial birds in Latin America were, with a few exceptions, nonexistent. For many species all that was known was the general range and habitat type. While the logistical and political challenges are still present, the last few years has seen the opening...
Productivity, pesticides, and management of the Peregrine Falcon in Arizona
D. H. Ellis
1985, Book chapter, Raptor Research Foundation Symposium on the Management of Birds of Prey. International Meeting. Session 4.
In the decade since research commenced with the Peregrine in Arizona, over 60 sites have been identified which historically or presently are occupied by breeding pairs. Productivity was determined for about 120 breeding attempts from 1975-85. Almost all sites, for which productivity information is available for two or more years,...