Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16905
Roadblocks on the kill curve: Testing the Raup hypothesis Roadblocks on the kill curve: Testing the Raup hypothesis
The documented presence of two large (~100-km diameter), possibly coeval impact craters of late Eocene age, requires modification of the impact-kill curve proposed by David M. Raup. Though the estimated meteorite size for each crater alone is large enough to have produced considerable global environmental stress, no horizons of mass mortality or pulsed extinction are known to be...
Authors
C. W. Poag
Migratory bird hunting: Revised test protocol for nontoxic approval procedures for shot and shot coating; Final rule Migratory bird hunting: Revised test protocol for nontoxic approval procedures for shot and shot coating; Final rule
No abstract available.
Authors
C.M. Perry, K.A. Morehouse, Barnett A. Rattner
Conservation of Mexican wetlands: role of the North American Wetlands Conservation Act Conservation of Mexican wetlands: role of the North American Wetlands Conservation Act
Mexico's wetlands support a tremendous biological diversity and provide significant natural resource benefits to local communities. Because they are also critical stopover and wintering grounds for much of North America's waterfowl and other migratory birds, Mexico has become an important participant in continental efforts to conserve these resources through the North American Wetlands
Authors
M.H. Wilson, D.A. Ryan
The first nest records of the sooty antbird (Myrmeciza fortis) with notes on eggs and nestling development The first nest records of the sooty antbird (Myrmeciza fortis) with notes on eggs and nestling development
Two Myrmeciza fortis nests were discovered in a lowland floodplain forest of Manu National Park, Peru. Both nests were embedded in leaf litter on the ground and were oven-shaped with a an entrance and an inner chamber concealing two eggs. Unlike the known nests of other Myrmeciza spp., the nests of Myrmeciza fortis closely resembled nests of other species in the Thamnophilidae. This...
Authors
F.A. Wilkinson, U.R. Smith
Evaluation of a mallard HSI model for the Lower Mississippi Valley Evaluation of a mallard HSI model for the Lower Mississippi Valley
We evaluated a habitat suitability (HSI) model developed for mallards (Anas platyrhynchos) wintering in the Lower Mississippi Valley by comparing mallard densities obtained from aerial surveys with habitat suitability indices derived from satellite imagery for 25, 256km2 sampling units. Regression models that related mallard densities to habitat suitability indices accounted for only 29%...
Authors
D.J. Twedt, Michael W. Brown, James R. Nassar
Behavior of Puerto Rican parrots during failed nesting attempts Behavior of Puerto Rican parrots during failed nesting attempts
We compared patterns of nesting behavior of four pairs of Puerto Rican Parrots (Amazona vittata) that experienced failed nesting attempts to behavior of four pairs of parrots that experienced no substantial nest problems and successfully fledged young without management intervention. Only changes in female parrots' behavior were clearly associated with nest failure. During incubation...
Authors
K.A. Wilson, M.H. Wilson, R. Field
Pathogenicity of entomopathogenic fungus Metarhizium anisopliae (Deuteromycetes) to Ixodes scapularis (Acari: Ixodidae) Pathogenicity of entomopathogenic fungus Metarhizium anisopliae (Deuteromycetes) to Ixodes scapularis (Acari: Ixodidae)
The entomopathogenic fungus Metarhizium anisopliae is highly pathogenic to the black-legged tick, Ixodes scapularis. Spore concentrations of 108/ml for engorged larvae and 107/ml for engorged females resulted in 100% tick mortality, 2 wk post-infection. The LC50 value for engorged larvae (concentration to kill 50% of ticks) was 107 spores/ml. Metarhizium anisopliae shows considerable...
Authors
E. Zhioua, M. Browning, P.W. Johnson, H. S. Ginsberg, R.A. LeBrun
Female reproductive dynamics in a Maryland population of ringneck snakes (Diadophis punctatus) Female reproductive dynamics in a Maryland population of ringneck snakes (Diadophis punctatus)
Adult female ringneck snakes (Diadophis punctatus) collected from a Maryland population during five successive summers laid a total of 50 clutches in which all eggs hatched successfully under laboratory conditions. Mean hatchling mass was not significantly related to female mass or clutch size when each was evaluated in separate analyses, but was significantly related to these factors...
Authors
D. R. Clark, C.M. Bunck, R.J. Hall
Transferability of habitat suitability criteria for fishes in warmwater streams Transferability of habitat suitability criteria for fishes in warmwater streams
We developed habitat suitability criteria and tested their transferability for nine fishes inhabiting unregulated Piedmont and Coastal Plain streams in Alabama. Criteria for optimal habitat were defined as those ranges of depth, velocity, substrate type, and cover type for which a species' suitability index (proportional abundance divided by proportional habitat availability, scaled from...
Authors
Mary C. Freeman, Zachary H. Bowen, Johnie H. Crance
Stochastic seasonality and nonlinear density-dependent factors regulate population size in an African rodent Stochastic seasonality and nonlinear density-dependent factors regulate population size in an African rodent
Ecology has long been troubled by the controversy over how populations are regulated. Some ecologists focus on the role of environmental effects, whereas others argue that density-dependent feedback mechanisms are central. The relative importance of both processes is still hotly debated, but clear examples of both processes acting in the same population are rare. Keyfactor analysis...
Authors
H. Leirs, N. C. Stenseth, J.D. Nichols, J.E. Hines, R. Verhagen, W. Verheyen