Amanda Demopoulos, Ph.D.
I lead multidisciplinary investigations into coastal and deep-sea benthic communities funded by USGS-EMA and partners, including BOEM and NOAA, that pull together scientists and experts from across USGS, as well as NOAA, BOEM, and many academic institutions. Deep-sea investigations are complex and logistically challenging and require an interdisciplinary approach to disentangle what makes them tick.
Science and Products
Biodiversity and community composition of sediment macrofauna associated with deep-sea Lophelia pertusa habitats in the Gulf of Mexico
Coral communities as indicators of ecosystem-level impacts of the Deepwater Horizon spill
Deep-sea coral record of human impact on watershed quality in the Mississippi River Basin
Augmentation of French grunt diet description using combined visual and DNA-based analyses
Benthic community structure and composition in sediment from the northern Gulf of Mexico shoreline, Texas to Florida
Deepwater Program: Studies of Gulf of Mexico lower continental slope communities related to chemosynthetic and hard substrate habitats
Connectivity of tropical marine ecosystems--An overview of interdisciplinary research to understand biodiversity and trophic relationships in the Virgin Islands and Puerto Rico
Impact of the Deepwater Horizon oil spill on a deep-water coral community in the Gulf of Mexico
Comprehensive summary of beach renourishment and offshore sand removal impacts for Florida
Use of stable isotopes and mercury to assess trophic positions of black carp and other large fishes in the Red-Atchafalaya River system, Louisiana, USA
Impacts of exotic mangrove forests and mangrove deforestation on carbon remineralization and ecosystem functioning in marine sediments
Food-web structure of seep sediment macrobenthos from the Gulf of Mexico
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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Biodiversity and community composition of sediment macrofauna associated with deep-sea Lophelia pertusa habitats in the Gulf of Mexico
Scleractinian corals create three-dimensional reefs that provide sheltered refuges, facilitate sediment accumulation, and enhance colonization of encrusting fauna. While heterogeneous coral habitats can harbor high levels of biodiversity, their effect on the community composition within nearby sediments remains unclear, particularly in the deep sea. Sediment macrofauna from deep-sea coral habitatsAuthorsAmanda W.J. Demopoulos, Jill R. Bourque, Janessy FrometaCoral communities as indicators of ecosystem-level impacts of the Deepwater Horizon spill
The Macondo oil spill released massive quantities of oil and gas from a depth of 1500 meters. Although a buoyant plume carried released hydrocarbons to the sea surface, as much as half stayed in the water column and much of that in the deep sea. After the hydrocarbons reached the surface, weathering processes, burning, and the use of a dispersant caused hydrocarbon-rich marine snow to sink into thAuthorsCharles R. Fisher, Amanda W.J. Demopoulos, Erik E. Cordes, Iliana B. Baums, Helen K. White, Jill R. BourqueDeep-sea coral record of human impact on watershed quality in the Mississippi River Basin
One of the greatest drivers of historical nutrient and sediment transport into the Gulf of Mexico is the unprecedented scale and intensity of land use change in the Mississippi River Basin. These landscape changes are linked to enhanced fluxes of carbon and nitrogen pollution from the Mississippi River, and persistent eutrophication and hypoxia in the northern Gulf of Mexico. Increased terrestrialAuthorsNancy G. Prouty, E. Brendan Roark, Alan E. Koenig, Amanda W.J. Demopoulos, Fabian C. Batista, Benjamin D. Kocar, David Selby, Matthew D. McCarthy, Furu MienisAugmentation of French grunt diet description using combined visual and DNA-based analyses
Trophic linkages within a coral-reef ecosystem may be difficult to discern in fish species that reside on, but do not forage on, coral reefs. Furthermore, dietary analysis of fish can be difficult in situations where prey is thoroughly macerated, resulting in many visually unrecognisable food items. The present study examined whether the inclusion of a DNA-based method could improve the identificaAuthorsJohn S. Hargrove, Daryl C. Parkyn, Debra J. Murie, Amanda W.J. Demopoulos, James D. AustinBenthic community structure and composition in sediment from the northern Gulf of Mexico shoreline, Texas to Florida
From April 20 through July 15, 2010, approximately 4.93 million barrels of crude oil spilled into the Gulf of Mexico from the British Petroleum Macondo-1 well, representing the largest spill in U.S. waters. Baseline benthic community conditions were assessed from shoreline sediment samples collected from 56 stations within the swash zone (for example, sample depth ranged from 0 to 1.5 feet) alongAuthorsAmanda W.J. Demopoulos, Douglas G. StromDeepwater Program: Studies of Gulf of Mexico lower continental slope communities related to chemosynthetic and hard substrate habitats
This report summarizes research funded by the U.S. Geological Survey (USGS) in collaboration with the University of North Carolina at Wilmington (UNCW) on the ecology of deep chemosynthetic communities in the Gulf of Mexico. The research was conducted at the request of the U.S. Bureau of Ocean Energy Management, Regulation and Enforcement (BOEMRE; formerly Minerals Management Service) to complemenAuthorsSteve W. Ross, Amanda W.J. Demopoulos, Christina A. Kellogg, Cheryl L. Morrison, Martha S. Nizinski, Cheryl L. Ames, Tara L. Casazza, Daniel Gualtieri, Kaitlin Kovacs, Jennifer P. McClain, Andrea M. Quattrini, Adela Y. Roa-Varon, Andrew D. ThalerConnectivity of tropical marine ecosystems--An overview of interdisciplinary research to understand biodiversity and trophic relationships in the Virgin Islands and Puerto Rico
The Virgin Islands and Puerto Rico contain marine reserves and protected areas that encompass a variety of tropical ecosystems, including coral reefs, mangroves, and seagrass beds. Reserves and protected areas are established for a variety of reasons, such as preserving nursery habitats and biodiversity, or reducing anthropogenic effects associated with pollution and land use. Questions remain regAuthorsJennifer P. McClain-Counts, Amanda W.J. DemopoulosImpact of the Deepwater Horizon oil spill on a deep-water coral community in the Gulf of Mexico
To assess the potential impact of the Deepwater Horizon oil spill on offshore ecosystems, 11 sites hosting deep-water coral communities were examined 3 to 4 mo after the well was capped. Healthy coral communities were observed at all sites >20 km from the Macondo well, including seven sites previously visited in September 2009, where the corals and communities appeared unchanged. However, at one sAuthorsHelen K. White, Pen-Yuan Hsing, Walter Cho, Timothy M. Shank, Erik E. Cordes, Andrea M. Quattrini, Robert K. Nelson, Richard Camilli, Amanda W.J. Demopoulos, Christopher R. German, James M. Brooks, Harry H. Roberts, William Shedd, Christopher M. Reddy, Charles R. FisherComprehensive summary of beach renourishment and offshore sand removal impacts for Florida
This report is temporarily unavailable pending review.AuthorsA.W.J. Demopoulos, D.J. Gualtieri, A. Neils, D. HugeUse of stable isotopes and mercury to assess trophic positions of black carp and other large fishes in the Red-Atchafalaya River system, Louisiana, USA
No abstract available.AuthorsL. Nico, A. Demopoulos, D. Gualtieri, C. WieserImpacts of exotic mangrove forests and mangrove deforestation on carbon remineralization and ecosystem functioning in marine sediments
To evaluate how mangrove invasion and removal can modify short-term benthic carbon cycling and ecosystem functioning, we used stable-isotopically labeled algae as a deliberate tracer to quantify benthic respiration and C-flow over 48 h through macrofauna and bacteria in sediments collected from (1) an invasive mangrove forest, (2) deforested mangrove sites 2 and 6 years after removal of above-sediAuthorsA.K. Sweetman, J.J. Middelburg, A.M. Berle, A.F. Bernardino, C. Schander, A.W.J. Demopoulos, C.R. SmithFood-web structure of seep sediment macrobenthos from the Gulf of Mexico
The slope environment of the Gulf of Mexico (GOM) supports dense communities of seep megafaunal invertebrates that rely on endosymbiotic bacteria for nutrition. Seep sediments also contain smaller macrofaunal invertebrates whose nutritional pathways are not well understood. Using stable-isotope analysis, we investigate the utilization of chemosynthetically fixed and methane-derived organic matterAuthorsAmanda W.J. Demopoulos, Daniel Gualtieri, Kaitlin KovacsNon-USGS Publications**
Demopoulos, A.W.J., B. Fry., C.R. Smith. 2007. Food-web structure in exotic and native mangroves: a Hawaii-Puerto Rico comparison, Oecologia. 153:675-686.Cordes EE, Berlet SP, Cardman Z, Dannenberg R, Demopoulos AWJ, Georgian SE, King C, McKean DL, Young DM. 2014. Exploring deep-sea coral communities and the effects of oil and gas inputs to the Gulf of Mexico. Oceanography 27(supplement): 28-29. doi:10.5670/oceanog.2014.supplement.01ten Brink, U., D.F. Coleman, J. Chaytor, A.W.J. Demopoulos, R. Armstrong, G. Garcia-Moliner, N.A. Raineault, B. Andrews, R. Chastain, K. Rodrigue, M. Mercier-Gingras. 2014. Earthquake, Landslide, and Tsunami Hazards and Benthic Biology in the Greater Antilles. Oceanography 27(supplement): 34-35. doi:10.5670/oceanog.2014.supplement.01Morrison, C.L., Baco, A.R., Nizinski, M.S., Coykendall, D.K., Demopoulos, A.W.J., Cho, W., Shank, T.M. 2014. Population connectivity of deep-sea corals. In: T.F. Hourigan, P. Etnoyer (Eds). The State of Deep Coral Ecosystems of the United States: NOAA Technical Memorandum. Silver Spring, MD. In Press.Demopoulos, A.W.J. and C.R. Smith. 2010. Invasive mangroves alter macrofaunal community structure and facilitate opportunistic exotics. Mar. Ecol. Prog. Ser. 404:51-67Fry, B., N. Cormier, and A.W.J. Demopoulos 2009. Adventures in an isotopically ordered world-the chemical ecology of Micronesian mangroves and crabs, Pages 50-56 in N. Yoshida, ed., Proceedings of the 4th International Conference on Isotopomers, ISI2008-18, 292 pp.Demopoulos, A.W.J. 2004. Black Mangrove Benthic Community Structure, Seedling Growth and Survival, and Sediment Characteristics in Anthropogenically Disturbed and Pristine Habitats, NOAA/NERR final report, Jobos Bay National Estuarine Research Reserve, Puerto Rico.Demopoulos, A.W.J. 2003. Introduced mangroves in the Hawaiian Islands: Their history and impact on Hawaiian coastal ecosystems. In: Global Invasive Species Programme-Invasive Species Report following the conference on the Ecological and Socio-Economic Impacts of Invasive Alien Species on Island Ecosystems.Demopoulos, A.W.J. 2004. Aliens in paradise: a comparative assessment of introduced and native mangrove benthic community composition, food-web structure, and litter-fall production. Ph.D. Thesis. Dept. of Oceanography, University of Hawaii.Smith, C.R. and A.W.J. Demopoulos. 2003. Ecology of the deep Pacific Ocean floor. In: Ecosystems of the World Volume 28: Ecosystems of the Deep Ocean, P.A. Tyler, ed., Elsevier, Amsterdam, 569 pp.Demopoulos, A.W.J., C.R. Smith, and P.A. Tyler. 2003. Ecology of the deep Indian Ocean floor. In: Ecosystems of the World Volume 28: Ecosystems of the Deep Ocean, P.A. Tyler, ed., Elsevier, Amsterdam. 569 pp.Demopoulos, A.W.J., C.R. Smith, D.J. DeMaster and W. Fornes. 2003. Evaluation of excess 234Th activity in sediments as an indicator of food quality for deep-sea deposit feeders. J. Mar. Res. 61:267-284.Demopoulos, A.W.J. 2000. Evaluation of excess 234Th activity in sediments as an indicator of food quality for deep-sea deposit feeders, M.S. Thesis. Dept. of Oceanography, University of Hawaii.Levin, L.A., fT.S. Talley, A.A. Larson, A. Jones*. 1997. Faunal composition in the Tijuana River Estuary Intertidal Habitats and the role of life histories in the faunal recovery of Southern California Restored Wetlands. Final Report to the Tijuana River National Estuarine Research Reserve. NOAA Award, No. NA 670R0237. NOAA.Levin, L., D. Talley, T. Talley, A. Larson, A. Jones*, G. Thayer, C. Currin, and C. Lund. 1997. Restoration of Spartina marsh function: An infaunal perspective. Conference Proceedings, Society for Ecological Restoration, 1995 International Conference. Seattle, Washington. Sept. 14-16, 1995.**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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