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
Discovering the deep: Exploring remote Pacific marine protected areas
Deepwater Program: Lophelia II, continuing ecological research on deep-sea corals and deep-reef habitats in the Gulf of Mexico
Effects of host injury on susceptibility of marine reef fishes to ectoparasitic gnathiid isopods
Food-web dynamics and isotopic niches in deep-sea communities residing in a submarine canyon and on the adjacent open slopes
Deep-sea coral research and technology program: Alaska deep-sea coral and sponge initiative final report
Trophic structure of mesopelagic fishes in the Gulf of Mexico revealed by gut content and stable isotope analyses
Seasonal variability in particulate matter source and composition to the depositional zone of Baltimore Canyon, U.S. Mid-Atlantic Bight
Host-dependent differences in resource use associated with Anilocra spp. parasitism in two coral reef fishes, as revealed by stable carbon and nitrogen isotope analyses
Demersal fish assemblages on seamounts and other rugged features in the northeastern Caribbean
Food-web structure in canyon and slope-associated fauna revealed by stable isotopes
Impacts of the Deepwater Horizon oil spill on deep-sea coral-associated sediment communities
Ectoparasitism on deep-sea fishes in the western North Atlantic: In situ observations from ROV surveys
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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Discovering the deep: Exploring remote Pacific marine protected areas
The 2017 Discovering the Deep expedition provided the first glimpse of the deep-sea geology and ecology of the deepwater regions of Swains Island, the Howland and Baker Islands Unit of PRIMNM, Phoenix Islands Protected Areas (PIPA), and the Tokelau Region (Figure 1). Prior to this expedition, virtually no visual reconnaissance had been conducted in any of these areas below scuba diving depths. ROVAuthorsAmanda W.J. Demopoulos, Steven Auscavitch, Derek Sowers, Nikolai Pawlenko, Brian R. C. KennedyDeepwater Program: Lophelia II, continuing ecological research on deep-sea corals and deep-reef habitats in the Gulf of Mexico
The deep sea is a rich environment composed of diverse habitat types. While deep-sea coral habitats have been discovered within each ocean basin, knowledge about the ecology of these habitats and associated inhabitants continues to grow. This report presents information and results from the Lophelia II project that examined deep-sea coral habitats in the Gulf of Mexico. The Lophelia II project focAuthorsAmanda W.J. Demopoulos, Steve W. Ross, Christina A. Kellogg, Cheryl L. Morrison, Martha S. Nizinski, Nancy G. Prouty, Jill R. Bourque, Julie P. Galkiewicz, Michael A. Gray, Marcus J. Springmann, D. Katharine Coykendall, Andrew Miller, Mike Rhode, Andrea Quattrini, Cheryl L. Ames, Sandra D. Brooke, Jennifer P. McClain-Counts, E. Brendan Roark, Noreen A. Buster, Ryan M. Phillips, Janessy FrometaEffects of host injury on susceptibility of marine reef fishes to ectoparasitic gnathiid isopods
The importance of the role that parasites play in ecological communities is becoming increasingly apparent. However much about their impact on hosts and thus populations and communities remains poorly understood. A common observation in wild populations is high variation in levels of parasite infestation among hosts. While high variation could be due to chance encounter, there is increasing evidenAuthorsWilliam G. Jenkins, Amanda W.J. Demopoulos, Paul C. SikkelFood-web dynamics and isotopic niches in deep-sea communities residing in a submarine canyon and on the adjacent open slopes
Examination of food webs and trophic niches provide insights into organisms' functional ecology, yet few studies have examined trophodynamics within submarine canyons, where the interaction of canyon morphology and oceanography influences habitat provision and food deposition. Using stable isotope analysis and Bayesian ellipses, we documented deep-sea food-web structure and trophic niches in BaltiAuthorsAmanda W.J. Demopoulos, Jennifer McClain-Counts, Steve W. Ross, Sandra Brooke, Furu MienisDeep-sea coral research and technology program: Alaska deep-sea coral and sponge initiative final report
Deep-sea coral and sponge ecosystems are widespread throughout most of Alaska’s marine waters. In some places, such as the central and western Aleutian Islands, deep-sea coral and sponge resources can be extremely diverse and may rank among the most abundant deep-sea coral and sponge communities in the world. Many different species of fishes and invertebrates are associated with deep-sea coral andAuthorsChris Rooper, Robert P. Stone, Peter Etnoyer, Christina Conrath, Jennifer Reynolds, H. Gary Greene, Branwen Williams, Enrique Salgado, Cheryl L. Morrison, Rhian G. Waller, Amanda W.J. DemopoulosTrophic structure of mesopelagic fishes in the Gulf of Mexico revealed by gut content and stable isotope analyses
Mesopelagic fishes represent an important component of the marine food web due to their global distributions, high abundances and ability to transport organic material throughout a large part of the water column. This study combined stable isotope (SIAs) and gut content analyses (GCAs) to characterize the trophic structure of mesopelagic fishes in the North-Central Gulf of Mexico. Additionally, thAuthorsJennifer P. McClain-Counts, Amanda W.J. Demopoulos, Steve W. RossSeasonal variability in particulate matter source and composition to the depositional zone of Baltimore Canyon, U.S. Mid-Atlantic Bight
Submarine canyons are often hotspots of biomass and productivity in the deep sea. However, the majority of deep-sea canyons remain poorly sampled. Using a multi-tracer approach, results from a detailed geochemical investigation from a year-long sediment trap deployment reveals details concerning the source, transport, and fate of particulate matter to the depositional zone (1318 m) of Baltimore CAuthorsNancy G. Prouty, Furu Mienis, P. Campbell, E. Brendan Roark, Andrew Davies, Craig M. Robertson, Gerard Duineveld, Steve W. Ross, M. Rhodes, Amanda W.J. DemopoulosHost-dependent differences in resource use associated with Anilocra spp. parasitism in two coral reef fishes, as revealed by stable carbon and nitrogen isotope analyses
The role of parasites in trophic ecology is poorly understood in marine ecosystems. Stable isotope analyses (SIA) have been widely used in studies of trophic ecology, but have rarely been applied to study the role of parasites. Considering that some parasites are associated with altered host foraging patterns, SIA can help elucidate whether parasitism influences host trophic interactions. French gAuthorsRachel Welicky, Amanda W.J. Demopoulos, Paul C. SikkelDemersal fish assemblages on seamounts and other rugged features in the northeastern Caribbean
Recent investigations of demersal fish communities in deepwater (>50 m) habitats have considerably increased our knowledge of the factors that influence the assemblage structure of fishes across mesophotic to deep-sea depths. While different habitat types influence deepwater fish distribution, whether different types of rugged seafloor features provide functionally equivalent habitat for fishes isAuthorsAndrea M. Quattrini, Amanda W.J. Demopoulos, Randal Singer, Adela Roa-Varon, Jason D. ChaytorFood-web structure in canyon and slope-associated fauna revealed by stable isotopes
Food webs and associated trophic linkages among organisms are central themes in ecology that provide insight into the structure and function of ecosystems. In the deep sea, food webs rely on particulate flux raining from surface waters for energy (Klages et al. 2003), except for chemosynthetic communities, which rely on in situ production via chemosynthesis (Van Dover 2007). In general, the deep sAuthorsAmanda W. J. Demopoulos, Jennifer P. McClain-Counts, Steve W. Ross, Sandra Brooke, Michael RhodeImpacts of the Deepwater Horizon oil spill on deep-sea coral-associated sediment communities
Cold-water corals support distinct populations of infauna within surrounding sediments that provide vital ecosystem functions and services in the deep sea. Yet due to their sedentary existence, infauna are vulnerable to perturbation and contaminant exposure because they are unable to escape disturbance events. While multiple deep-sea coral habitats were injured by the 2010 Deepwater Horizon (DWH)AuthorsAmanda W.J. Demopoulos, Jill R. Bourque, Erik E. Cordes, Katherine StamlerEctoparasitism on deep-sea fishes in the western North Atlantic: In situ observations from ROV surveys
A complete understanding of how parasites influence marine ecosystem functioning requires characterizing a broad range of parasite-host interactions while determining the effects of parasitism in a variety of habitats. In deep-sea fishes, the prevalence of parasitism remains poorly understood. Knowledge of ectoparasitism, in particular, is limited because collection methods often cause dislodgmentAuthorsAndrea Quattrini, Amanda W.J. DemopoulosNon-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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