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Explore WARC's science publications.

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Measuring mercury and other elemental components in tree rings Measuring mercury and other elemental components in tree rings

There has been considerable interest in measuring heavy metal pollution, such as mercury, using tree ring analysis. Since 1970, this method has provided a historical snapshot of pollutant concentrations near hazardous waste sites. Traditional methods of analysis have long been used with heavy metal pollutants such as mercury. These methods, such as atomic fluorescence and laser ablation...
Authors
C. Gillan, W.A. Hollerman, T.W. Doyle, T.E. Lewis

Perspective on eastern migration studies: Stopover ecology of migratory landbirds in the Gulf Coast region Perspective on eastern migration studies: Stopover ecology of migratory landbirds in the Gulf Coast region

Millions of Nearctic-Neotropical landbirds move through the coastal habitats of the Gulf of Mexico each spring and autumn as they migrate across and around the Gulf. Migration routes in the Gulf region are not static and they shift year to year and season to season according to prevailing wind patterns. Using data from field and radar studies, we mapped patterns of migration movement and...
Authors
W.C. Barrow, L.A. Johnson Randall

The effectiveness of a barrier wall and underpasses in reducing wildlife mortality on a heavily traveled highway in Florida The effectiveness of a barrier wall and underpasses in reducing wildlife mortality on a heavily traveled highway in Florida

Because of high numbers of animals killed on Paynes Prairie State Preserve, Alachua County, Florida, the Florida Department of Transportation constructed a barrier wall-culvert system to reduce wildlife mortality yet allow for passage of some animals across the highway. During a one year study following construction, we counted only 158 animals, excluding hylid treefrogs, killed in the...
Authors
C.K. Dodd, W.J. Barichivich, L. L. Smith

Mechanisms for dominance in an early successional old field by the invasive non-native Lespedeza cuneata (Dum. Cours.) G. Don Mechanisms for dominance in an early successional old field by the invasive non-native Lespedeza cuneata (Dum. Cours.) G. Don

Researchers studying invasive plants often concentrate their efforts on predictive models thought to allow invasive plants to dominate native landscapes. However, if an invasive is already well established then experimental research is necessary to provide the information necessary to effectively manage the species. Prescribing appropriate management strategies without prior experimental...
Authors
A.L. Brandon, D.J. Gibson, B.A. Middleton

Flow cytometric analysis of crayfish haemocytes activated by lipopolysaccharides Flow cytometric analysis of crayfish haemocytes activated by lipopolysaccharides

Lipopolysaccharides (LPS) from Gram-negative bacteria are strong stimulators of white river crayfish, Procambarus zonangulus, haemocytes in vitro. Following haemocyte treatment with LPS and with LPS from rough mutant R5 (LPS Rc) from Salmonella minnesota, flow cytometric analysis revealed a conspicuous and reproducible decrease in cell size as compared to control haemocytes. These LPS...
Authors
W. Cardenas, J.R. Dankert, J.A. Jenkins

Cichlidae Cichlidae

No abstract available.
Authors
P. J. Schofield, A. B. Powell

Snakeheads (Pisces, Channidae): A biological synopsis and risk assessment Snakeheads (Pisces, Channidae): A biological synopsis and risk assessment

Snakeheads (family Channidae) are airbreathing freshwater fishes containing two genera, Channa with 26 species native to Asia, Malaysia, and Indonesia; and Parachanna with 3 species native to tropical Africa. Some snakeheads are small, reaching about 17 centimeters, but most are much larger, the largest reported to be 1.8 meters in length. All are considered thrust predators with most...
Authors
Walter R. Courtenay, James D. Williams
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