Wetland and Aquatic Research Center


WARC conducts relevant and objective research, develops new approaches and technologies, and disseminates scientific information needed to understand, manage, conserve, and restore wetlands and other aquatic and coastal ecosystems and their associated plant and animal communities throughout the nation and the world.


USGS: Science for a changing world
July 12, 2017

Lack of Major Hurricanes Since 2008 Is Likely the Main Reason

A Manatee swimming in Florida waters.
April 11, 2017

Florida’s iconic manatee population is highly likely to endure for the next 100 years, so long as wildlife managers continue to protect the marine mammals and their habitat, a new study by the US Geological Survey and the Florida Fish and Wildlife Research Institute has found.

April 11, 2017

We appreciate your interest in USGS' Sirenia Project. To help inform members of the media and public, we have provided relevant publications, reports, and websites. 


Year Published: 2017

Carrying capacity in a heterogeneous environment with habitat connectivity

A large body of theory predicts that populations diffusing in heterogeneous environments reach higher total size than if non-diffusing, and, paradoxically, higher size than in a corresponding homogeneous environment. However, this theory and its assumptions have not been rigorously tested. Here, we extended previous theory to include exploitable...

Zhang, Bo; Kula, Alex; Mack, Keenan M.L.; Zhai, Lu; Ryce, Arrix L.; Ni, Wei-Ming; DeAngelis, Don; Van Dyken, J. David
Zhang, B., Kula, A., Mack, K.M.L., Zhai, L., Ryce, A.L., Ni, W.-M., DeAngelis, D.L., and Van Dyken, J.D., 2017, Carrying capacity in a heterogeneous environment with habitat connectivity: Ecology Letters, Early View, http://dx.doi.org/10.1111/ele.12807.

Year Published: 2017

Land area change in coastal Louisiana (1932 to 2016)

Coastal Louisiana wetlands are one of the most critically threatened environments in the United States. These wetlands are in peril because Louisiana currently experiences greater coastal wetland loss than all other States in the contiguous United States combined. The analyses of landscape change presented here have utilized historical surveys,...

Couvillion, Brady R.; Beck, Holly; Schoolmaster, Donald; Fischer, Michelle
Couvillion, B.R., Beck, Holly, Schoolmaster, Donald, and Fischer, Michelle, 2017, Land area change in coastal Louisiana 1932 to 2016: U.S. Geological Survey Scientific Investigations Map 3381, 16 p. pamphlet, https://doi.org/10.3133/sim3381.

Year Published: 2017

Assessing welfare of individual sirenians in the wild and in captivity

Assessing the welfare of wild populations of sirenians has required a “generalist” approach. The outcome has been a subjective decision as to whether what the observers are witnessing in an individual or group of animals is normal and whether that has positive or negative consequences. The understanding of sirenian welfare requirements, and a...

Flint, Mark; Bonde, Robert K.
Flint, M., and Bonde, R.K., 2017, Assessing welfare of individual Sirenians in the wild and in captivity, in Butterworth, A., Ed., Marine Mammal Welfare: Human Induced Change in the Marine Environment and its Impacts on Marine Mammal Welfare, Animal Welfare 17, p. 381-393, https://doi.org/10.1007/978-3-319-46994-2_21.