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Explore WARC's science publications.

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Application of ground-truth for classification and quantification of bird movements on migratory bird habitat initiative sites in southwest Louisiana: final report Application of ground-truth for classification and quantification of bird movements on migratory bird habitat initiative sites in southwest Louisiana: final report

This project was initiated to assess migrating and wintering bird use of lands enrolled in the Natural Resources Conservation Service’s (NRCS) Migratory Bird Habitat Initiative (MBHI). The MBHI program was developed in response to the Deepwater Horizon oil spill in 2010, with the goal of improving/creating habitat for waterbirds affected by the spill. In collaboration with the University...
Authors
Wylie C. Barrow, Michael J. Baldwin, Lori A. Randall, John Pitre, Kyle J. Dudley

Adaptive harvest management for the Svalbard population of pink-footed geese: cooperator report Adaptive harvest management for the Svalbard population of pink-footed geese: cooperator report

This document describes progress to date on the development of a harvest‐management strategy for maintaining pink‐footed goose abundance near their target level by providing for sustainable harvests in Norway and Denmark. Many goose populations in western Europe have increased dramatically in recent decades. The Svalbard population of pink‐footed geese (Anser brachyrhynchus) is a good...
Authors
Fred A. Johnson, Gitte H. Jensen, Jesper Madsen

Adaptive harvest management for the Svalbard population of pink-footed geese: a response to a review of the progress summary Adaptive harvest management for the Svalbard population of pink-footed geese: a response to a review of the progress summary

Herein we provide excerpts of the reviewers' comments and our response. We did not duplicate the portion of the reviewers' comments in which they summarized our findings.
Authors
Fred A. Johnson, Gitte H. Jensen, Jesper Madsen

Potential effects of sea-level rise on coastal wetlands in southeastern Louisiana Potential effects of sea-level rise on coastal wetlands in southeastern Louisiana

Coastal Louisiana wetlands contain about 37% of the estuarine herbaceous marshes in the conterminous United States. The long-term stability of coastal wetlands is often a function of a wetland's ability to maintain elevation equilibrium with mean sea level through processes such as primary production and sediment accretion. However, Louisiana has sustained more coastal wetland loss than...
Authors
Patty Glick, Jonathan Clough, Amy Polaczyk, Brady R. Couvillion, Brad Nunley

Confronting dynamics and uncertainty in optimal decision making for conservation Confronting dynamics and uncertainty in optimal decision making for conservation

The effectiveness of conservation efforts ultimately depends on the recognition that decision making, and the systems that it is designed to affect, are inherently dynamic and characterized by multiple sources of uncertainty. To cope with these challenges, conservation planners are increasingly turning to the tools of decision analysis, especially dynamic optimization methods. Here we...
Authors
Byron K. Williams, Fred A. Johnson

Monitoring vegetation response to episodic disturbance events by using multitemporal vegetation indices Monitoring vegetation response to episodic disturbance events by using multitemporal vegetation indices

Normalized Difference Vegetation Index (NDVI) derived from MODerate-resolution Imaging Spectroradiometer (MODIS) satellite imagery and land/water assessments from Landsat Thematic Mapper (TM) imagery were used to quantify the extent and severity of damage and subsequent recovery after Hurricanes Katrina and Rita of 2005 within the vegetation communities of Louisiana's coastal wetlands...
Authors
Gregory D. Steyer, Brady R. Couvillion, John A. Barras

Strong species-environment feedback shapes plant community assembly along environmental gradients Strong species-environment feedback shapes plant community assembly along environmental gradients

An aim of community ecology is to understand the patterns of competing species assembly along environmental gradients. All species interact with their environments. However, theories of community assembly have seldom taken into account the effects of species that are able to engineer the environment. In this modeling study, we integrate the species' engineering trait together with...
Authors
Jiang Jiang, Donald L. DeAngelis

Economic vulnerability to sea-level rise along the northern U.S. Gulf Coast Economic vulnerability to sea-level rise along the northern U.S. Gulf Coast

The northern Gulf of Mexico coast of the United States has been identified as highly vulnerable to sea-level rise, based on a combination of physical and societal factors. Vulnerability of human populations and infrastructure to projected increases in sea level is a critical area of uncertainty for communities in the extremely low-lying and flat northern gulf coastal zone. A rapidly...
Authors
Cindy A. Thatcher, John Brock, Elizabeth A. Pendleton

Marsh collapse thresholds for coastal Louisiana estimated using elevation and vegetation index data Marsh collapse thresholds for coastal Louisiana estimated using elevation and vegetation index data

Forecasting marsh collapse in coastal Louisiana as a result of changes in sea-level rise, subsidence, and accretion deficits necessitates an understanding of thresholds beyond which inundation stress impedes marsh survival. The variability in thresholds at which different marsh types cease to occur (i.e., marsh collapse) is not well understood. We utilized remotely sensed imagery, field...
Authors
Brady R. Couvillion, Holly Beck

Statewide summary for Louisiana: Chapter E in Emergent wetlands status and trends in the northern Gulf of Mexico: 1950-2010 Statewide summary for Louisiana: Chapter E in Emergent wetlands status and trends in the northern Gulf of Mexico: 1950-2010

Throughout the past century, emergent wetlands have been declining across the Gulf of Mexico. Emergent wetland ecosystems provide a variety of resources, including plant and wildlife habitat, commercial and recreational economic activity, and natural barriers against storms. As emergent wetland losses increase, so does the need for information on the causes and effects of this loss...
Authors
Lawrence R. Handley, Kathryn A. Spear, Jenneke Visser, Cindy A. Thatcher, Scott A. Wilson

Global climate change impacts on coastal ecosystems in the Gulf of Mexico: Considerations for integrated coastal management Global climate change impacts on coastal ecosystems in the Gulf of Mexico: Considerations for integrated coastal management

Global climate change is important in considerations of integrated coastal management in the Gulf of Mexico. This is true for a number of reasons. Climate in the Gulf spans the range from tropical to the lower part of the temperate zone. Thus, as climate warms, the tropical temperate interface, which is currently mostly offshore in the Gulf of Mexico, will increasingly move over the...
Authors
John W. Day, Alejandro Yanez-Arancibia, James H. Cowan, Richard H. Day, Robert R. Twilley, John R. Rybczyk
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