Publications
Explore WARC's science publications.
Filter Total Items: 3509
Normalization of metal concentrations in estuarine sediments from the Gulf of Mexico Normalization of metal concentrations in estuarine sediments from the Gulf of Mexico
Metal concentrations were examined in sediments from 497 sites within the estuaries of the Gulf of Mexico by the United States Environmental Protection Agency's Environmental Monitoring and Assessment Program (EMAP). Data were normalized for extant concentrations of aluminum to isolate natural factors from anthropogenic ones. The normalization was based on the hypothesis that metal...
Authors
J.Kevin Summers, Terry L. Wade, Virginia D. Engle, Ziad A. Malaeb
Remote sensing of mangrove wetlands: Relating canopy spectra to site-specific data Remote sensing of mangrove wetlands: Relating canopy spectra to site-specific data
No abstract available.
Authors
Elijah Ramsey III, John R. Jensen
Effects of nutrients and hydroperiod on Typha, Cladium, and Eleocharis: Implications for everglades restoration Effects of nutrients and hydroperiod on Typha, Cladium, and Eleocharis: Implications for everglades restoration
The recent expansion of Typha domingensis (Typha) into areas of the Everglades previously dominated by Cladium jamaicense (Cladium) communities has led to competing hypotheses about the importance of nutrient concentration vs. hydroperiod in controlling the distribution of these species. In this study, experimental mixtures of Typha domingensis, Cladium jamaicense, and Eleocharis...
Authors
S. Newman, James B. Grace, J. W. Koebel
Seagrass responses to long-term light reduction by brown tide in upper Laguna Madre, Texas: Distribution and biomass patterns Seagrass responses to long-term light reduction by brown tide in upper Laguna Madre, Texas: Distribution and biomass patterns
A brown tide caused by a very dense bloom of an as yet undescribed species of the new class Pelagophyceae was first reported in upper Laguna Madre, Texas, USA, in June 1990 and has been there continuously through December 1995. No change in response to reduced light was evident in the distribution of the seagrass Halodulewrightii along transects sampled before the brown tide in 1988 and...
Authors
Christopher P. Onuf
Migration strategies of North American Anatinae Migration strategies of North American Anatinae
No abstract available.
Authors
Clinton W. Jeske
A metabolism-based trophic index for comparing the ecological values of shallow-water sediment habitats A metabolism-based trophic index for comparing the ecological values of shallow-water sediment habitats
We determined fluxes of oxygen and nutrients between water and sediments at 21 sites primarily in Virginia and North Carolina estuaries, over the past 15 yr. These sites represented broad ranges in salinity, tidal amplitude, hydrology, nutrient availability, turbidity, light availability, depth, sediment grain size, and anthropogenic disturbance. In general, we found that...
Authors
W.M. Rizzo, S. K. Dailey, G. J. Lackey, R.R. Christian, B. E. Berry, R. L. Wetzel
Analysis of a Lake Superior coastal food web with stable isotope techniques Analysis of a Lake Superior coastal food web with stable isotope techniques
Food-web components of a Lake Superior coastal wetland and adjacent offshore waters were examined with stable isotope ratio techniques for carbon and nitrogen. We found distinct carbon isotope ratio signatures for organisms collected in the wetland and from offshore. Both food-web groups seemed to be based on carbon fixed by phytoplankton. Compared to offshore organisms, the wetland food...
Authors
Janet R. Keough, Michael E. Sierszen, Cynthia Hagley
Ecosystem management: A decision support GIS approach Ecosystem management: A decision support GIS approach
This paper describes a new approach using decision support GIS for handling information in ecosystem management. Technical research efforts resulted in specialized spatial decision support systems for wetland restoration planning, wetland permit analysis, and wildlife research and management. These applications are briefly presented to illustrate the usage of the methodology. With its...
Authors
Wei Ji
Lipid and water depletion in migrating passerines following passage over the Gulf of Mexico Lipid and water depletion in migrating passerines following passage over the Gulf of Mexico
Lipid depletion is currently believed to be the primary factor limiting flight duration of migrating birds in North America, while the influence of water loss is thought to be small. Three migrating species of passerines, wood thrush (Hylocichla mustelina), Swainson's thrush (Catharus ustulatus), and summer tanager (Piranga rubra) were captured during the 1993 spring migration just after...
Authors
P.L. Leberg, T. J. Spengler, Wylie C. Barrow
Food availability and feeding preferences of breeding fulvous whistling-ducks in Louisiana ricefields Food availability and feeding preferences of breeding fulvous whistling-ducks in Louisiana ricefields
Expansion of the breeding distribution of the Fulvous whistling-duck (Dendrocygna bicolor) into the southeastern United States after the mid-1800s coincided with the establishment of rice (Oryza sativa) cultures in Texas, Louisiana, and Florida. In southern Louisiana, where approximately 80% of rice is aerially seeded in water, Fulvous whistling-ducks are suspected of feeding extensively...
Authors
William L. Hohman, Timothy M. Stark, Joseph L. Moore
On the relationship between plant species diversity and biomass: A comment on a paper by Gough, Grace and Taylor On the relationship between plant species diversity and biomass: A comment on a paper by Gough, Grace and Taylor
No abstract available.
Authors
R. H. Marrs, James B. Grace, L. Gough