Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16909
Mercury concentrations in feathers of wading birds from Florida Mercury concentrations in feathers of wading birds from Florida
Primary or tail feathers were collected from 92 wading birds in Florida from Lake Okeechobee and wetlands farther south, from 1987 to 1990. Mean concentrations detected in feathers of nestlings were 2.0 ppm Hg in roseate spoonbills (Ajaia ajaja), 3.5 ppm Hg in great blue herons (Ardea herodias), 4.7 ppm Hg in great white herons (Ardea herodias occidentalis), and 7.1 ppm Hg in great...
Authors
W. N. Beyer, M. Spalding, D. Morrison
The role of sediment ingestion in exposing wood ducks to lead The role of sediment ingestion in exposing wood ducks to lead
Waterfowl on lateral lakes of the Coeur d'Alene River and on Lake Coeur d'Alene have been poisoned for many years by lead (Pb) from mining and smelting. In 1992 we undertook a study in the area to determine the importance of sediment ingestion in exposing wood ducks (Aix sponsa) to Pb. Digesta were removed from the intestines of wood ducks collected from contaminated and reference areas...
Authors
W. N. Beyer, L. J. Blus, Charles J. Henny, D. Audet
Estimation of population trajectories from count data Estimation of population trajectories from count data
Monitoring of changes in animal population size is rarely possible through complete censuses; frequently, the only feasible means of monitoring changes in population size is to use counts of animals obtained by skilled observers as indices to abundance. Analysis of changes in population size can be severely biased if factors related to the acquisition of data are not adequately...
Authors
W.A. Link, J.R. Sauer
An adaptive management approach to controlling suburban deer An adaptive management approach to controlling suburban deer
Distance sight-resight sampling has particular relevance to aerial surveys, in which height above ground and aircraft speed make the critical assumption of certain detection on the track-line unrealistic. Recent developments in distance sight-resight theory have left practical issues related to data collection as the major impediment to widespread use of distance sight-resight sampling...
Authors
C.K. Nielson, W.F. Porter, H.B. Underwood
Reproductive biology of the green turtle (Chelonia mydas) at Tern Island, French Frigate Shoals, Hawai`i Reproductive biology of the green turtle (Chelonia mydas) at Tern Island, French Frigate Shoals, Hawai`i
We monitored nesting of the green turtle (Chelonia mydas Linnaeus) on Tern Island, French Frigate Shoals, in the Northwestern Hawaiian Islands from 1986 through 1991. Egg oviposition occurred between 26 April and 20 October. Nesting peaked between mid-June and early August. Hatchlings emerged between mid-August and early October. Mean incubation period was 66.0 (range 53-97) days. Mean...
Authors
K. R. Niethammer, G.H. Balazs, Jeff S. Hatfield, G.L. Nakai, J.L. Megyesi
An assessment of campsite conditions in Great Smoky Mountains National Park An assessment of campsite conditions in Great Smoky Mountains National Park
This research effort designed and implemented a backcountry campsite monitoring program for Great Smoky Mountains National Park (GSMNP). This report reviews the need for visitor impact monitoring programs, describes monitoring procedures developed and applied at GSMNP, presents results from the first monitoring cycle, evaluates current park camping management policies, and provides
Authors
J. L. Marion, Y-L Leung
Population trends of black ducks and mallards from the North American Breeding Bird Survey: Are increases in mallards associated with declines in black ducks? Population trends of black ducks and mallards from the North American Breeding Bird Survey: Are increases in mallards associated with declines in black ducks?
No abstract available.
Authors
J.R. Sauer, Sam Droege
Comparative productivity of American black ducks and mallards breedings on the Chesapeake Bay Comparative productivity of American black ducks and mallards breedings on the Chesapeake Bay
No abstract available.
Authors
D.G. Krementz, Daniel B. Stotts, Vernon D. Stotts, G.W. Pendleton
Reproductive strategies for coping with poor conditions: responses of roseate terns to low food availability during the egg-laying period at Falkner Island, Connecticut Reproductive strategies for coping with poor conditions: responses of roseate terns to low food availability during the egg-laying period at Falkner Island, Connecticut
No abstract available.
Authors
J. A. Spendelow, James M. Zingo, Jeff S. Hatfield
Growth and fledgling of roseate terns in exceptionally 'good' and 'poor' years of overall productivity Growth and fledgling of roseate terns in exceptionally 'good' and 'poor' years of overall productivity
No abstract available.
Authors
J. A. Spendelow, James M. Zingo, D. A. Shealer, G.W. Pendleton
Recent numerical changes in North American roseate terns and their conjectured cause Recent numerical changes in North American roseate terns and their conjectured cause
No abstract available.
Authors
J.J. Hatch, J. A. Spendelow, J.D. Nichols, J.E. Hines
Survival and fates of staging juvenile, female mallards in the Vermont / Quebec border region Survival and fates of staging juvenile, female mallards in the Vermont / Quebec border region
We alternately marked 80 juvenile, female mallards (Anas platyrhynchos), half with transmitters and bands and half with only bands in 1990 and 1991. Survival of radio-marked ducks was monitored daily and then summarized weekly for the periods 31 August - 6 December, 1990 (weeks 5-18) and 11 September - 6 December, 1991) (weeks 6-18). The pattern of survival throughout the staging period...
Authors
J. R. Longcore, D.G. McAuley, C.M. Bunck