Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16740
The 1995-1999 Summary of the North American Breeding Bird Survey The 1995-1999 Summary of the North American Breeding Bird Survey
Data from the North American Breeding Bird Survey were used to estimate continental and regional changes in bird populations for the 5-yr period 1995-1999 and the 2-yr period 1998-1999. These short-term changes were placed in the context of population trends estimated over the 1966-1999 interval. During 1995-1999, 44% of all species exhibited positive trends over the entire survey area...
Authors
K.L. Pardieck, J.R. Sauer
Breeding season demography and movements of Eastern Towhees at the Savannah River Site, South Carolina Breeding season demography and movements of Eastern Towhees at the Savannah River Site, South Carolina
The Eastern Towhee (Pipilo erythrophthalmus) has undergone population declines across much of its range, especially in New England. Despite being a widespread and, at one time, a common species, relatively little is known about its natural history, ecology, or demographics. We conducted baseline research on Eastern Towhees at the Savannah River Site, South Carolina, in 1995 and 1996 to...
Authors
David G. Krementz, Larkin A. Powell
A new species of Hyla (Anura: Hylidae) from the Sierra Mixes, Oaxaca, Mexico, with comments on ontogenetic variation in the tadpoles A new species of Hyla (Anura: Hylidae) from the Sierra Mixes, Oaxaca, Mexico, with comments on ontogenetic variation in the tadpoles
We describe a new species of Hyla that differs from the similar-loohng species H. pentheter by reaching a larger size, ha\iing a smaller tympanum, more webbing on the feet, more extensive nuptial excrescences, and a different color pattern on the flanks. \Ve tentatively place this new species in the phenetic assemblage commonly referred to as the H. bistincta group. \Ve describe and...
Authors
P.C. Ustach, J.R. Mendelson, R.W. McDiarmid, J. A. Campbell
Survival and reproductive biology of the Bachman's Sparrow Survival and reproductive biology of the Bachman's Sparrow
We estimated breeding season survival rates and nest success for Bachman's Sparrows at the Savannah River Site, South Carolina, using radio telemetry. The 1995 breeding season (2 May-9 Aug) survival rate was 0.905 (95% C. I. 0.779-1.03) with 2 mortalities out of 20 individuals. The 1996 breeding season (10 May-25 Jul) survival rate was 0.882 (95% C. I. 0.729-1.04) with 2 mortalities out...
Authors
J.M. Stober, D.G. Krementz
Yellow-nosed Albatross on Fire Island, LI, NY Yellow-nosed Albatross on Fire Island, LI, NY
No abstract available.
Authors
P. A. Buckley, G. Schairer
Stalking salamanders in Acadia National Park Stalking salamanders in Acadia National Park
No abstract available.
Authors
M.S. Bank, A.F. O'Connell
Effects of white phosphorus on mallard reproduction Effects of white phosphorus on mallard reproduction
Extensive waterfowl mortality involving thousands of ducks, geese, and swans has occurred annually at Eagle River Flats, Alaska since at least 1982. The primary agent for this mortality has been identified as white phosphorus. Although acute and subacute lethality have been described, sublethal effects are less well known. This study reports on the effects of white phosphorus on...
Authors
S.I. Vann, D. W. Sparling, M. A. Ottinger
Lead poisoning of passerines at a trap and skeet range Lead poisoning of passerines at a trap and skeet range
Our objective was to determine if ground foraging passerines in a woodland surrounding a trap and skeet range were subject to lead poisoning. Lead availability to birds was determined by shot counts and soil and earthworm analysis. Avian exposure to lead was identified by measuring free-erythrocyte protoporphyrin levels in blood and lead in tissues of three passerine species. Results...
Authors
N.B. Vyas, J. W. Spann, G. H. Heinz, W. N. Beyer, J.A. Jaquette, J.M. Mengelkoch
American Black Duck (Anas rubripes) American Black Duck (Anas rubripes)
No abstract available.
Authors
J. R. Longcore, D.G. McAuley, Gary R. Hepp, J.M. Rhymer
The role of population monitoring in the management of North American waterfowl The role of population monitoring in the management of North American waterfowl
Despite the effort and expense devoted to large-scale monitoring programs, few existing programs have been designed with specific objectives in mind and few permit strong inferences about the dynamics of monitored systems. The waterfowl population monitoring programs of the U.S. Fish and Wildlife Service, Canadian Wildlife Service and state and provincial agencies provide a nice example...
Authors
J.D. Nichols, B. Kenneth Williams, Fred A. Johnson
Camping impact management at Isle Royale National Park: an evaluation of visitor activity containment policies from the perspective of social conditions Camping impact management at Isle Royale National Park: an evaluation of visitor activity containment policies from the perspective of social conditions
A survey of backcountry and wilderness campsites at Isle Royale National Park reveals that the park?s policies for managing visitor impacts have been remarkably effective in limiting the areal extent of camping-related disturbance. However, the dense spatial arrangement of designated campsites within backcountry campgrounds has also contributed to problems with visitor crowding and...
Authors
T. A. Farrell, J. L. Marion
Group A discussions of endpoint selection, study design, and extrapolation Group A discussions of endpoint selection, study design, and extrapolation
No abstract available.
Authors
J.B. French, S.P. Bradbury, H. Krueger, E. McGee, Bradley E. Sample