Publications
Explore WARC's science publications.
Filter Total Items: 3377
The importance of functional form in optimal control solutions of problems in population dynamics
Optimal control theory is finding increased application in both theoretical and applied ecology, and it is a central element of adaptive resource management. One of the steps in an adaptive management process is to develop alternative models of system dynamics, models that are all reasonable in light of available data, but that differ substantially in their implications for optimal control of the
Authors
M.C. Runge, F.A. Johnson
Conditions and limitations on learning in the adaptive management of mallard harvests
In 1995, the United States Fish and Wildlife Service adopted a protocol for the adaptive management of waterfowl hunting regulations (AHM) to help reduce uncertainty about the magnitude of sustainable harvests. To date, the AHM process has focused principally on the midcontinent population of mallards (Anas platyrhynchos), whose dynamics are described by 4 alternative models. Collectively, these
Authors
F.A. Johnson, W. L. Kendall, J.A. Dubovsky
Effects of wastewater on forested wetlands
Cycling nutrient-enriched wastewater from holding ponds through natural, forested wetlands is a practice that municipal waste treatment managers are considering as a viable option for disposing of wastewater. In this wastewater cycling process, sewer effluent that has been circulated through aerated ponds is discharged into neighboring wetland systems. To understand how wastewater cycling affects
Authors
Thomas W. Doyle
Modeling the bathymetry of Catahoula Lake: Specialized technology for wetland management
Catahoula Lake is the largest natural freshwater lake in Louisiana, covering more than 46 square miles (120 km2) (fig. 1). The lake is a principal stopover and wintering site for hundreds of thousands of migratory waterfowl and shorebirds. Scientists from the USGS National Wetlands Research Center are applying some of the research facility's specialties?wetland plant research, aerial and ground su
Authors
T.W. Doyle, T.C. Michot, C. Wells
History and ecology of mangroves in the Dry Tortugas
Dry Tortugas National Park, which includes Bush, Long, Loggerhead, Garden, and Bird Keys, is a cluster of islands and coral reefs approximately 112.9 km (70 miles) west of Key West, Florida (fig. 1). These islands were explored in 1513 by Ponce de León, who named them for the abundance of sea turtles, “tortugas,” and the lack of fresh water in the area. Historically, the Tortugas shoals have been
Authors
T.W. Doyle, T.C. Michot, Richard H. Day, C.J. Wells
Increased incidence of red imported fire ant (Hymenoptera: Formicidae) presence in loggerhead sea turtle (Testudines: Cheloniidae) nests and observations of hatchling mortality
No abstract available.
Authors
L.B. Parris, M.M. Lamont, R.R. Carthy
[Book review] Green engineering: environmentally conscious design, by David T. Allen and David R. Shonnard
Review of: Green engineering: Environmentally conscious design / David T. Allen and David R. Shonnard / Prentice-Hall, Inc., One Lake Street, Upper Saddle River, NJ 07458. 2002. 552 pages. ISBN 0-13-061908-6.
Authors
R.G. Boustany
Hurricane Mitch: Landscape Analysis of Damaged Forest Resources of the Bay Islands and Caribbean Coast of Honduras
The advent of analog and digital video has provided amateur photographers with professional-like technology to capture dynamic images with ease and clarity. Videography is also rapidly changing traditional business and scientific applications. In the natural sciences, camcorders are being used largely to record timely observations of plant and animal behavior or consequence of some catastrophic ev
Authors
Thomas W. Doyle, Thomas C. Michot, Fred Roetker, Jason Sullivan, Marcus Melder, Benjamin Handley, Jeff Balmat
Understanding sturgeon life history: Enigmas, myths, and insights from scientific studies
No abstract available.
Authors
K. J. Sulak, M. Randall
Why do sturgeon jump? Insights from acoustic investigations of the Gulf sturgeon in the Suwannee River, Florida
No abstract available.
Authors
K. J. Sulak, R. E. Edwards, G. W. Hill, M. Randall
Mercury in feathers from Chilean birds: Influence of location, feeding strategy and taxonomic affiliation
This study reports baseline concentrations of mercury (Hg) in feathers from different species of birds sampled at various locations off the Chilean coast (Southeastern Pacific). Hg concentrations were evaluated in relation to geographic location, taxonomic affiliation, and feeding strategies. Between January and March of 1995, we collected mature contour feathers from 116 birds belonging to 22 spe
Authors
H. G. Ochoa-Acuna, M. S. Sepulveda, T. S. Gross
Relationships between streambed substrate characteristics and freshwater mussels (Bivalvia: Unionidae) in coastal plain streams
Freshwater mussels and stream substrate were sampled at 30 locations in the Apalachicola, Chattahoochee, and Flint (ACF) river basins. Although >2100 mussels that included 25 species were observed in our sample of 2661 quadrats, only 5 species were sufficiently abundant to provide reliable estimates of the relationship between mussel presence and substrate composition. Among these 5 species, only
Authors
Jayne Brim-Box, Robert M. Dorazio, W. D. Liddell