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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

Filter Total Items: 19
Image Collage of Landsat, pollinator, and volcanologist

Seafloor Benthic Mapping and Characterization: Enhancing our Understanding of Aleutian Islands’ Hazards, Potential Seabed Minerals and Deep Corals

A USGS-led expedition in the Aleutian Arc off Alaska will provide critical information on energy resources, underwater earthquakes and other hazards, seafloor habitats, and biological resources, including key fisheries, as well as potential seabed minerals.
By
Ecosystems Mission Area, Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Land Management Research Program, Species Management Research Program, Eastern Ecological Science Center, Pacific Coastal and Marine Science Center, St. Petersburg Coastal and Marine Science Center, Wetland and Aquatic Research Center , Woods Hole Coastal and Marine Science Center, Hawaiian Volcano Observatory, Deep Sea Exploration, Mapping and Characterization
Seafloor Benthic Mapping and Characterization: Enhancing our Understanding of Aleutian Islands’ Hazards, Potential Seabed Minerals and Deep Corals

Seafloor Benthic Mapping and Characterization: Enhancing our Understanding of Aleutian Islands’ Hazards, Potential Seabed Minerals and Deep Corals

A USGS-led expedition in the Aleutian Arc off Alaska will provide critical information on energy resources, underwater earthquakes and other hazards, seafloor habitats, and biological resources, including key fisheries, as well as potential seabed minerals.
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Orange coral at the seafloor

Mesophotic and Deep Benthic Communities: Habitat Assessment and Evaluation

Through a collaborative effort with other federal agencies and academic and research institutions, USGS is working to fill data gaps, determine baseline conditions, and characterize key community conditions at mesophotic and deep benthic sites impacted by the Deepwater Horizon oil spill.
By
Ecosystems Mission Area, Land Management Research Program, Wetland and Aquatic Research Center
Mesophotic and Deep Benthic Communities: Habitat Assessment and Evaluation

Mesophotic and Deep Benthic Communities: Habitat Assessment and Evaluation

Through a collaborative effort with other federal agencies and academic and research institutions, USGS is working to fill data gaps, determine baseline conditions, and characterize key community conditions at mesophotic and deep benthic sites impacted by the Deepwater Horizon oil spill.
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Close up of an orange coral polyp

Mesophotic and Deep Benthic Communities: Coral Propagation Technique (CPT) Development Project

Through a collaborative effort with other federal agencies and academic and research institutions, the USGS is working to inform and enhance the protection and management of coral communities in mesophotic and deep benthic areas of the Gulf.
By
Ecosystems Mission Area, Land Management Research Program, Eastern Ecological Science Center, St. Petersburg Coastal and Marine Science Center, Wetland and Aquatic Research Center , Gulf of America
Mesophotic and Deep Benthic Communities: Coral Propagation Technique (CPT) Development Project

Mesophotic and Deep Benthic Communities: Coral Propagation Technique (CPT) Development Project

Through a collaborative effort with other federal agencies and academic and research institutions, the USGS is working to inform and enhance the protection and management of coral communities in mesophotic and deep benthic areas of the Gulf.
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Diverse deep sea coral species

NRDA: Deepwater ROV Sampling to Assess Potential Impacts to Hardbottom Coral Communities and Associates from the Deepwater Horizon Oil Spill

The MC252 oil spill introduced hydrocarbons, dispersants, and drilling muds into the Gulf, potentially adversely affecting the seafloor environment surrounding the spill site.
By
Ecosystems Mission Area, Land Management Research Program, Species Management Research Program, Wetland and Aquatic Research Center , Deep Sea Exploration, Mapping and Characterization, Gulf of America
NRDA: Deepwater ROV Sampling to Assess Potential Impacts to Hardbottom Coral Communities and Associates from the Deepwater Horizon Oil Spill

NRDA: Deepwater ROV Sampling to Assess Potential Impacts to Hardbottom Coral Communities and Associates from the Deepwater Horizon Oil Spill

The MC252 oil spill introduced hydrocarbons, dispersants, and drilling muds into the Gulf, potentially adversely affecting the seafloor environment surrounding the spill site.
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Lophelia pertusa coral

USGS DISCOVRE: Benthic Ecology, Trophodynamics, and Ecosystem Connectivity – Lophelia II: Continuing Ecological Research on Deep-Sea Corals and Deep Reef Habitats in the Gulf

Deep-sea coral habitats are complex ecosystems at the landscape and local level. While these systems may harbor substantial levels of biodiversity, they remain inadequately investigated.
By
Ecosystems Mission Area, Wetland and Aquatic Research Center , Deep Sea Exploration, Mapping and Characterization, Gulf of America
USGS DISCOVRE: Benthic Ecology, Trophodynamics, and Ecosystem Connectivity – Lophelia II: Continuing Ecological Research on Deep-Sea Corals and Deep Reef Habitats in the Gulf

USGS DISCOVRE: Benthic Ecology, Trophodynamics, and Ecosystem Connectivity – Lophelia II: Continuing Ecological Research on Deep-Sea Corals and Deep Reef Habitats in the Gulf

Deep-sea coral habitats are complex ecosystems at the landscape and local level. While these systems may harbor substantial levels of biodiversity, they remain inadequately investigated.
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Coral reef assemblage at the FGBNMS expansion

Connectivity of Coral Ecosystems in the Northwestern Gulf

Connectivity among coral communities influences the probability of speciation and contributes to their ability to adapt to natural and anthropogenic stressors. Results from this study will enhance our understanding of Gulf ecosystems with regional conservation initiatives to inform the restoration of degraded deepwater coral communities and preserve long-term viability of coastal ecosystems.
By
Ecosystems Mission Area, Species Management Research Program, Wetland and Aquatic Research Center , Deep Sea Exploration, Mapping and Characterization, Gulf of America
Connectivity of Coral Ecosystems in the Northwestern Gulf

Connectivity of Coral Ecosystems in the Northwestern Gulf

Connectivity among coral communities influences the probability of speciation and contributes to their ability to adapt to natural and anthropogenic stressors. Results from this study will enhance our understanding of Gulf ecosystems with regional conservation initiatives to inform the restoration of degraded deepwater coral communities and preserve long-term viability of coastal ecosystems.
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Baltimore Canyon, Outer continental Shelf

USGS DISCOVRE: Benthic Ecology, Trophodynamics, Ecosystem Connectivity of Mid-Atlantic Deepwater Hard Bottom Habitats with Emphasis on Canyon and Coral Communities

Deep-sea canyons are complex environments encompassing a range of benthic habitats, including soft sediments along the axis of the canyon, and hard substrates along the canyon walls.
By
Ecosystems Mission Area, Land Management Research Program, Species Management Research Program, Wetland and Aquatic Research Center , Deep Sea Exploration, Mapping and Characterization
USGS DISCOVRE: Benthic Ecology, Trophodynamics, Ecosystem Connectivity of Mid-Atlantic Deepwater Hard Bottom Habitats with Emphasis on Canyon and Coral Communities

USGS DISCOVRE: Benthic Ecology, Trophodynamics, Ecosystem Connectivity of Mid-Atlantic Deepwater Hard Bottom Habitats with Emphasis on Canyon and Coral Communities

Deep-sea canyons are complex environments encompassing a range of benthic habitats, including soft sediments along the axis of the canyon, and hard substrates along the canyon walls.
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remotely operated vehicle Deep Discoverer

Environmental Impacts following the 1970 Testing of Seabed Mining Equipment on the Blake Plateau- Quantification of Benthic Communities Across Disturbance Gradients

USGS researchers will characterize the ecology of benthic communities associated with deep-sea environments, including hardground features and adjacent soft sediments, and will build upon previous work conducted in areas off the U.S. east coast under consideration for oil and gas leases.
By
Wetland and Aquatic Research Center , Woods Hole Coastal and Marine Science Center
Environmental Impacts following the 1970 Testing of Seabed Mining Equipment on the Blake Plateau- Quantification of Benthic Communities Across Disturbance Gradients

Environmental Impacts following the 1970 Testing of Seabed Mining Equipment on the Blake Plateau- Quantification of Benthic Communities Across Disturbance Gradients

USGS researchers will characterize the ecology of benthic communities associated with deep-sea environments, including hardground features and adjacent soft sediments, and will build upon previous work conducted in areas off the U.S. east coast under consideration for oil and gas leases.
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Image shows methane bubbling up from the seafloor

Characterization of Benthic Habitats on the Pacific Margin: Assessing the Connectivity of Hard Substrates, Seeps and Canyon Communities

USGS researchers will characterize the ecology of benthic invertebrates associated with deep-sea environments and broader food-web dynamics within hardground features, seeps, and adjacent soft sediments. This project will provide important information regarding deepwater benthic habitats, such as chemosynthetic communities and deep-sea corals, that could be affected by offshore wind development.
By
Ecosystems Mission Area, Land Management Research Program, Species Management Research Program, Wetland and Aquatic Research Center
Characterization of Benthic Habitats on the Pacific Margin: Assessing the Connectivity of Hard Substrates, Seeps and Canyon Communities

Characterization of Benthic Habitats on the Pacific Margin: Assessing the Connectivity of Hard Substrates, Seeps and Canyon Communities

USGS researchers will characterize the ecology of benthic invertebrates associated with deep-sea environments and broader food-web dynamics within hardground features, seeps, and adjacent soft sediments. This project will provide important information regarding deepwater benthic habitats, such as chemosynthetic communities and deep-sea corals, that could be affected by offshore wind development.
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A bottomfish with small, bright spots lazily swims over a rocky seafloor among a few small pieces of kelp.

Ecosystems: EXPRESS

The continental shelf and slope offshore California, Oregon, and Washington are home to deep-sea corals, chemosynthetic communities, and other sensitive habitats that could be impacted by the development of energy and mineral resources. The EXPRESS (Expanding Pacific Research and Exploration of Submerged Systems) campaign will map and characterize these special areas to help guide ocean management...
By
Ecosystems Mission Area, Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, Deep Sea Exploration, Mapping and Characterization
Ecosystems: EXPRESS

Ecosystems: EXPRESS

The continental shelf and slope offshore California, Oregon, and Washington are home to deep-sea corals, chemosynthetic communities, and other sensitive habitats that could be impacted by the development of energy and mineral resources. The EXPRESS (Expanding Pacific Research and Exploration of Submerged Systems) campaign will map and characterize these special areas to help guide ocean management...
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Image shows methane bubbling up from the seafloor

EXPRESS: Expanding Pacific Research and Exploration of Submerged Systems

EXPRESS is a multi-year, multi-institution cooperative research campaign in deep sea areas of California, Oregon, and Washington, including the continental shelf and slope. EXPRESS data and information are intended to guide wise use of living marine resources and habitats, inform ocean energy and mineral resource decisions, and improve offshore hazard assessments.
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, Santa Cruz Core Scanning Laboratory, Santa Cruz Core Laboratories, Santa Cruz Core Splitting Laboratory, Organic Geochemistry Laboratory, Deep Sea Exploration, Mapping and Characterization
EXPRESS: Expanding Pacific Research and Exploration of Submerged Systems

EXPRESS: Expanding Pacific Research and Exploration of Submerged Systems

EXPRESS is a multi-year, multi-institution cooperative research campaign in deep sea areas of California, Oregon, and Washington, including the continental shelf and slope. EXPRESS data and information are intended to guide wise use of living marine resources and habitats, inform ocean energy and mineral resource decisions, and improve offshore hazard assessments.
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Pamlico Canyon

USGS Role in DEEP SEARCH: Deep Sea Exploration to Advance Research on Coral, Canyon, and Cold-seep Habitats

USGS scientists are collaborating with multiple agencies to provide the esssential foundation for understanding these deep-sea environments.
By
Ecosystems Mission Area, Land Management Research Program, Pacific Coastal and Marine Science Center, St. Petersburg Coastal and Marine Science Center, Wetland and Aquatic Research Center , Woods Hole Coastal and Marine Science Center, Deep Sea Exploration, Mapping and Characterization, Gulf of America
USGS Role in DEEP SEARCH: Deep Sea Exploration to Advance Research on Coral, Canyon, and Cold-seep Habitats

USGS Role in DEEP SEARCH: Deep Sea Exploration to Advance Research on Coral, Canyon, and Cold-seep Habitats

USGS scientists are collaborating with multiple agencies to provide the esssential foundation for understanding these deep-sea environments.
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Filter Total Items: 29

Stable isotope data for fauna, POM and sediments at 19 mesophotic coral habitats in the Gulf of America Stable isotope data for fauna, POM and sediments at 19 mesophotic coral habitats in the Gulf of America

Stable isotope dataset from fauna, particulate organic matter (POM) and sediments used to construct isotopic niches to compare trophic relationships in mesophotic coral habitats across the Gulf of America.
By
Wetland and Aquatic Research Center

Shotgun sequencing of multiple families of Polychaeta from U.S. Atlantic margin seeps and eDNA metabarcoding sequences of benthic community from Cascadia margin seeps using 18S marker, 2018–2019 Shotgun sequencing of multiple families of Polychaeta from U.S. Atlantic margin seeps and eDNA metabarcoding sequences of benthic community from Cascadia margin seeps using 18S marker, 2018–2019

Reported here are the geographic sampling information associated with the raw shotgun sequencing data of multiple families of Polychaeta samples collected from cold seep sites off the U.S. Atlantic margin as well as raw 18S amplicon sequencing data from sediment eDNA collected from Astoria Canyon seeps, located on the Cascadia margin, northeastern Pacific Ocean. Also included are GenBank...
By
Wetland and Aquatic Research Center

Sediment macrofaunal composition, stable isotopes, organic content, and grain size of the Cascadia margin (Pacific Ocean), June 2019 Sediment macrofaunal composition, stable isotopes, organic content, and grain size of the Cascadia margin (Pacific Ocean), June 2019

Dataset of sediment macrofaunal communities, geochemistry, and grain size associated with chemosynthetic and soft-sediment habitats along the Cascadia margin, Pacific Ocean, in 2019.
By
Wetland and Aquatic Research Center

Isotope data of vesicomyid clams collected in the Pacific Ocean off the Oregon coastline in 2019 Isotope data of vesicomyid clams collected in the Pacific Ocean off the Oregon coastline in 2019

Isotope data for vesicomyid clams collected in the Pacific Ocean off the Oregon coastline in 2019.
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Wetland and Aquatic Research Center

Greater Everglades Burmese Python Stable Isotope Data and Standard Ellipse Area Literature Review Greater Everglades Burmese Python Stable Isotope Data and Standard Ellipse Area Literature Review

Burmese pythons are an invasive species in the Greater Everglades Ecosystem. Burmese pythons captured in the ecosystem are euthanized, and in an effort to learn about this invasive species, all euthanized pythons are necropsied, during which time samples are collected. We analyzed the stable isotope ratios of carbon and nitrogen in muscle samples from 423 Burmese pythons euthanized and...
By
Wetland and Aquatic Research Center

Timing of coral (Swiftia exserta) spawning in U.S.G.S. Wetland and Aquatic Research Center, Gainesville, FL Timing of coral (Swiftia exserta) spawning in U.S.G.S. Wetland and Aquatic Research Center, Gainesville, FL

The 2010 Deepwater Horizon oil spill injured mesophotic and deep-sea environments over a vast area. In order to restore the mesophotic and deep-sea coral species impacted by the spill, information on fundamental ecosystem processes such as reproduction is needed. During expeditions in 2021 and 2022, fragments of the mesophotic octocoral Swiftia exserta were collected from the northern...
By
Wetland and Aquatic Research Center

Stable isotope, seep megafauna video analysis, and macrofauna of submarine canyons, deep-sea corals and seep habitats in the western Atlantic from 2018-2019 Stable isotope, seep megafauna video analysis, and macrofauna of submarine canyons, deep-sea corals and seep habitats in the western Atlantic from 2018-2019

Datasets of the sediment grain size and geochemistry, macrofaunal communities, stable isotope (carbon, nitrogen, sulfur) and seep video analyses associated with deep-sea corals, submarine canyons and seep habitats in the western Atlantic off the U.S. eastern coastline from 2018-2019.
By
Wetland and Aquatic Research Center

Biological and environmental data collected in 2015 within mangrove habitats of Rookery Bay Preserve on Marco Island, FL. Biological and environmental data collected in 2015 within mangrove habitats of Rookery Bay Preserve on Marco Island, FL.

Mangrove restoration efforts often focus on planting seedlings and ignore the underlying physical parameters causing mangrove loss, such as disruption to the hydrological regime. In order to determine success of hydrological restoration, baseline data need to be collected and assessed from a degraded mangrove system undergoing hydrological restoration. Sample collection occurred within...
By
Wetland and Aquatic Research Center

Stable isotope data and terrain variables for isoscape modeling around two submarine canyons in the western Atlantic sampled in 2012-2013 Stable isotope data and terrain variables for isoscape modeling around two submarine canyons in the western Atlantic sampled in 2012-2013

Terrain variables extracted from bathymetry were used in combination with stable isotope datasets to construct geospatially-explicit isoscapes that predicted variation in carbon and nitrogen isotopes across the canyon-slope seascape, providing insights into the distribution and flow of energy resources, relevant to understanding whole community function.
By
Wetland and Aquatic Research Center

Oceanographic conditions at Richardson reef reveal new suitable habitat for cold-water corals Oceanographic conditions at Richardson reef reveal new suitable habitat for cold-water corals

Cold-water corals create complex structures, but our incomplete knowledge of their niche space limits our ability to understand their distribution and therefore the impact of the ecosystem services they provide in the ocean. The Richardson reef complex consists of over 150 km of linear reef tracts within an area of 75 km2 between 700-900 m depth. This reef experiences rapid shifts in...
By
Wetland and Aquatic Research Center

Isotope data from Shimada 2018 research expedition Isotope data from Shimada 2018 research expedition

Stable isotope data of fauna, particulate organic matter, and rocks collected during the 2018 research cruise aboard the NOAA Ship Bell M. Shimada that examined benthic communities off the western U.S. coast.
By
Wetland and Aquatic Research Center

Stable isotope and video observational data from the RL1905 EXPRESS expedition in 2019 Stable isotope and video observational data from the RL1905 EXPRESS expedition in 2019

Data to support the site characterization of locations sampled along the continental shelf and slope of the western U.S. coast off Washington, Oregon and California during the EXPRESS RL1905 expedition in 2019. Data consisted of tissue samples from fauna, sediments and particulate organic matter. These samples were analyzed for stable carbon and nitrogen isotopes to examine food web...
By
Wetland and Aquatic Research Center
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Filter Total Items: 83

Augmentation of French grunt diet description using combined visual and DNA-based analyses Augmentation 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
Authors
John S. Hargrove, Daryl C. Parkyn, Debra J. Murie, Amanda W.J. Demopoulos, James D. Austin
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Benthic community structure and composition in sediment from the northern Gulf of Mexico shoreline, Texas to Florida Benthic 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...
Authors
Amanda W.J. Demopoulos, Douglas G. Strom
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Deepwater Program: Studies of Gulf of Mexico lower continental slope communities related to chemosynthetic and hard substrate habitats Deepwater 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
Authors
Steve 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. Thaler
By
Ecosystems Mission Area, Environmental Health Program, St. Petersburg Coastal and Marine Science Center, Wetland and Aquatic Research Center , Gulf of America

Connectivity of tropical marine ecosystems--An overview of interdisciplinary research to understand biodiversity and trophic relationships in the Virgin Islands and Puerto Rico Connectivity 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...
Authors
Jennifer P. McClain-Counts, Amanda W.J. Demopoulos
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Impact of the Deepwater Horizon oil spill on a deep-water coral community in the Gulf of Mexico Impact 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...
Authors
Helen 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. Fisher
By
Ecosystems Mission Area, Wetland and Aquatic Research Center , Gulf of America

Comprehensive summary of beach renourishment and offshore sand removal impacts for Florida Comprehensive summary of beach renourishment and offshore sand removal impacts for Florida

This report is temporarily unavailable pending review.
Authors
A. W.J. Demopoulos, D.J. Gualtieri, A. Neils, D. Huge
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

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 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

No abstract available.
Authors
L. Nico, A. Demopoulos, D. Gualtieri, C. Wieser
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Impacts of exotic mangrove forests and mangrove deforestation on carbon remineralization and ecosystem functioning in marine sediments Impacts 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...
Authors
A. K. Sweetman, J. J. Middelburg, A. M. Berle, A. F. Bernardino, C. Schander, A. W.J. Demopoulos, C. R. Smith
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Food-web structure of seep sediment macrobenthos from the Gulf of Mexico Food-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...
Authors
Amanda W.J. Demopoulos, Daniel Gualtieri, Kaitlin Kovacs
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Use of multiple chemical tracers to define habitat use of Indo-Pacific mangrove crab, Scylla serrata (Decapoda: Portunidae) Use of multiple chemical tracers to define habitat use of Indo-Pacific mangrove crab, Scylla serrata (Decapoda: Portunidae)

The mangrove or mud crab, Scylla serrata, is an important component of mangrove fisheries throughout the Indo-Pacific. Understanding crab diets and habitat use should assist in managing these fisheries and could provide additional justification for conservation of the mangrove ecosystem itself. We used multiple chemical tracers to test whether crab movements were restricted to local...
Authors
A. W.J. Demopoulos, Nicole Cormier, K. C. Ewel, B. Fry
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Food web structure in exotic and native mangroves: A Hawaii-Puerto Rico comparison Food web structure in exotic and native mangroves: A Hawaii-Puerto Rico comparison

Plant invasions can fundamentally alter detrital inputs and the structure of detritus-based food webs. We examined the detrital pathways in mangrove food webs in native (Puerto Rican) and introduced (Hawaiian) Rhizophora mangle forests using a dual isotope approach and a mixing model. Based on trophic-level fractionation of 0-1??? for ?? 13C and 2-3??? for ?? 15N, among the invertebrates...
Authors
A. W.J. Demopoulos, B. Fry, C. R. Smith
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Non-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.01
ten 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.01
Morrison, 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. 404:51-67
Fry, 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.

Filter Total Items: 27

Science and Products

Filter Total Items: 19
Image Collage of Landsat, pollinator, and volcanologist

Seafloor Benthic Mapping and Characterization: Enhancing our Understanding of Aleutian Islands’ Hazards, Potential Seabed Minerals and Deep Corals

A USGS-led expedition in the Aleutian Arc off Alaska will provide critical information on energy resources, underwater earthquakes and other hazards, seafloor habitats, and biological resources, including key fisheries, as well as potential seabed minerals.
By
Ecosystems Mission Area, Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Land Management Research Program, Species Management Research Program, Eastern Ecological Science Center, Pacific Coastal and Marine Science Center, St. Petersburg Coastal and Marine Science Center, Wetland and Aquatic Research Center , Woods Hole Coastal and Marine Science Center, Hawaiian Volcano Observatory, Deep Sea Exploration, Mapping and Characterization
Seafloor Benthic Mapping and Characterization: Enhancing our Understanding of Aleutian Islands’ Hazards, Potential Seabed Minerals and Deep Corals

Seafloor Benthic Mapping and Characterization: Enhancing our Understanding of Aleutian Islands’ Hazards, Potential Seabed Minerals and Deep Corals

A USGS-led expedition in the Aleutian Arc off Alaska will provide critical information on energy resources, underwater earthquakes and other hazards, seafloor habitats, and biological resources, including key fisheries, as well as potential seabed minerals.
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Orange coral at the seafloor

Mesophotic and Deep Benthic Communities: Habitat Assessment and Evaluation

Through a collaborative effort with other federal agencies and academic and research institutions, USGS is working to fill data gaps, determine baseline conditions, and characterize key community conditions at mesophotic and deep benthic sites impacted by the Deepwater Horizon oil spill.
By
Ecosystems Mission Area, Land Management Research Program, Wetland and Aquatic Research Center
Mesophotic and Deep Benthic Communities: Habitat Assessment and Evaluation

Mesophotic and Deep Benthic Communities: Habitat Assessment and Evaluation

Through a collaborative effort with other federal agencies and academic and research institutions, USGS is working to fill data gaps, determine baseline conditions, and characterize key community conditions at mesophotic and deep benthic sites impacted by the Deepwater Horizon oil spill.
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Close up of an orange coral polyp

Mesophotic and Deep Benthic Communities: Coral Propagation Technique (CPT) Development Project

Through a collaborative effort with other federal agencies and academic and research institutions, the USGS is working to inform and enhance the protection and management of coral communities in mesophotic and deep benthic areas of the Gulf.
By
Ecosystems Mission Area, Land Management Research Program, Eastern Ecological Science Center, St. Petersburg Coastal and Marine Science Center, Wetland and Aquatic Research Center , Gulf of America
Mesophotic and Deep Benthic Communities: Coral Propagation Technique (CPT) Development Project

Mesophotic and Deep Benthic Communities: Coral Propagation Technique (CPT) Development Project

Through a collaborative effort with other federal agencies and academic and research institutions, the USGS is working to inform and enhance the protection and management of coral communities in mesophotic and deep benthic areas of the Gulf.
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Diverse deep sea coral species

NRDA: Deepwater ROV Sampling to Assess Potential Impacts to Hardbottom Coral Communities and Associates from the Deepwater Horizon Oil Spill

The MC252 oil spill introduced hydrocarbons, dispersants, and drilling muds into the Gulf, potentially adversely affecting the seafloor environment surrounding the spill site.
By
Ecosystems Mission Area, Land Management Research Program, Species Management Research Program, Wetland and Aquatic Research Center , Deep Sea Exploration, Mapping and Characterization, Gulf of America
NRDA: Deepwater ROV Sampling to Assess Potential Impacts to Hardbottom Coral Communities and Associates from the Deepwater Horizon Oil Spill

NRDA: Deepwater ROV Sampling to Assess Potential Impacts to Hardbottom Coral Communities and Associates from the Deepwater Horizon Oil Spill

The MC252 oil spill introduced hydrocarbons, dispersants, and drilling muds into the Gulf, potentially adversely affecting the seafloor environment surrounding the spill site.
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Lophelia pertusa coral

USGS DISCOVRE: Benthic Ecology, Trophodynamics, and Ecosystem Connectivity – Lophelia II: Continuing Ecological Research on Deep-Sea Corals and Deep Reef Habitats in the Gulf

Deep-sea coral habitats are complex ecosystems at the landscape and local level. While these systems may harbor substantial levels of biodiversity, they remain inadequately investigated.
By
Ecosystems Mission Area, Wetland and Aquatic Research Center , Deep Sea Exploration, Mapping and Characterization, Gulf of America
USGS DISCOVRE: Benthic Ecology, Trophodynamics, and Ecosystem Connectivity – Lophelia II: Continuing Ecological Research on Deep-Sea Corals and Deep Reef Habitats in the Gulf

USGS DISCOVRE: Benthic Ecology, Trophodynamics, and Ecosystem Connectivity – Lophelia II: Continuing Ecological Research on Deep-Sea Corals and Deep Reef Habitats in the Gulf

Deep-sea coral habitats are complex ecosystems at the landscape and local level. While these systems may harbor substantial levels of biodiversity, they remain inadequately investigated.
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Coral reef assemblage at the FGBNMS expansion

Connectivity of Coral Ecosystems in the Northwestern Gulf

Connectivity among coral communities influences the probability of speciation and contributes to their ability to adapt to natural and anthropogenic stressors. Results from this study will enhance our understanding of Gulf ecosystems with regional conservation initiatives to inform the restoration of degraded deepwater coral communities and preserve long-term viability of coastal ecosystems.
By
Ecosystems Mission Area, Species Management Research Program, Wetland and Aquatic Research Center , Deep Sea Exploration, Mapping and Characterization, Gulf of America
Connectivity of Coral Ecosystems in the Northwestern Gulf

Connectivity of Coral Ecosystems in the Northwestern Gulf

Connectivity among coral communities influences the probability of speciation and contributes to their ability to adapt to natural and anthropogenic stressors. Results from this study will enhance our understanding of Gulf ecosystems with regional conservation initiatives to inform the restoration of degraded deepwater coral communities and preserve long-term viability of coastal ecosystems.
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Baltimore Canyon, Outer continental Shelf

USGS DISCOVRE: Benthic Ecology, Trophodynamics, Ecosystem Connectivity of Mid-Atlantic Deepwater Hard Bottom Habitats with Emphasis on Canyon and Coral Communities

Deep-sea canyons are complex environments encompassing a range of benthic habitats, including soft sediments along the axis of the canyon, and hard substrates along the canyon walls.
By
Ecosystems Mission Area, Land Management Research Program, Species Management Research Program, Wetland and Aquatic Research Center , Deep Sea Exploration, Mapping and Characterization
USGS DISCOVRE: Benthic Ecology, Trophodynamics, Ecosystem Connectivity of Mid-Atlantic Deepwater Hard Bottom Habitats with Emphasis on Canyon and Coral Communities

USGS DISCOVRE: Benthic Ecology, Trophodynamics, Ecosystem Connectivity of Mid-Atlantic Deepwater Hard Bottom Habitats with Emphasis on Canyon and Coral Communities

Deep-sea canyons are complex environments encompassing a range of benthic habitats, including soft sediments along the axis of the canyon, and hard substrates along the canyon walls.
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remotely operated vehicle Deep Discoverer

Environmental Impacts following the 1970 Testing of Seabed Mining Equipment on the Blake Plateau- Quantification of Benthic Communities Across Disturbance Gradients

USGS researchers will characterize the ecology of benthic communities associated with deep-sea environments, including hardground features and adjacent soft sediments, and will build upon previous work conducted in areas off the U.S. east coast under consideration for oil and gas leases.
By
Wetland and Aquatic Research Center , Woods Hole Coastal and Marine Science Center
Environmental Impacts following the 1970 Testing of Seabed Mining Equipment on the Blake Plateau- Quantification of Benthic Communities Across Disturbance Gradients

Environmental Impacts following the 1970 Testing of Seabed Mining Equipment on the Blake Plateau- Quantification of Benthic Communities Across Disturbance Gradients

USGS researchers will characterize the ecology of benthic communities associated with deep-sea environments, including hardground features and adjacent soft sediments, and will build upon previous work conducted in areas off the U.S. east coast under consideration for oil and gas leases.
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Image shows methane bubbling up from the seafloor

Characterization of Benthic Habitats on the Pacific Margin: Assessing the Connectivity of Hard Substrates, Seeps and Canyon Communities

USGS researchers will characterize the ecology of benthic invertebrates associated with deep-sea environments and broader food-web dynamics within hardground features, seeps, and adjacent soft sediments. This project will provide important information regarding deepwater benthic habitats, such as chemosynthetic communities and deep-sea corals, that could be affected by offshore wind development.
By
Ecosystems Mission Area, Land Management Research Program, Species Management Research Program, Wetland and Aquatic Research Center
Characterization of Benthic Habitats on the Pacific Margin: Assessing the Connectivity of Hard Substrates, Seeps and Canyon Communities

Characterization of Benthic Habitats on the Pacific Margin: Assessing the Connectivity of Hard Substrates, Seeps and Canyon Communities

USGS researchers will characterize the ecology of benthic invertebrates associated with deep-sea environments and broader food-web dynamics within hardground features, seeps, and adjacent soft sediments. This project will provide important information regarding deepwater benthic habitats, such as chemosynthetic communities and deep-sea corals, that could be affected by offshore wind development.
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A bottomfish with small, bright spots lazily swims over a rocky seafloor among a few small pieces of kelp.

Ecosystems: EXPRESS

The continental shelf and slope offshore California, Oregon, and Washington are home to deep-sea corals, chemosynthetic communities, and other sensitive habitats that could be impacted by the development of energy and mineral resources. The EXPRESS (Expanding Pacific Research and Exploration of Submerged Systems) campaign will map and characterize these special areas to help guide ocean management...
By
Ecosystems Mission Area, Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, Deep Sea Exploration, Mapping and Characterization
Ecosystems: EXPRESS

Ecosystems: EXPRESS

The continental shelf and slope offshore California, Oregon, and Washington are home to deep-sea corals, chemosynthetic communities, and other sensitive habitats that could be impacted by the development of energy and mineral resources. The EXPRESS (Expanding Pacific Research and Exploration of Submerged Systems) campaign will map and characterize these special areas to help guide ocean management...
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Image shows methane bubbling up from the seafloor

EXPRESS: Expanding Pacific Research and Exploration of Submerged Systems

EXPRESS is a multi-year, multi-institution cooperative research campaign in deep sea areas of California, Oregon, and Washington, including the continental shelf and slope. EXPRESS data and information are intended to guide wise use of living marine resources and habitats, inform ocean energy and mineral resource decisions, and improve offshore hazard assessments.
By
Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, Santa Cruz Core Scanning Laboratory, Santa Cruz Core Laboratories, Santa Cruz Core Splitting Laboratory, Organic Geochemistry Laboratory, Deep Sea Exploration, Mapping and Characterization
EXPRESS: Expanding Pacific Research and Exploration of Submerged Systems

EXPRESS: Expanding Pacific Research and Exploration of Submerged Systems

EXPRESS is a multi-year, multi-institution cooperative research campaign in deep sea areas of California, Oregon, and Washington, including the continental shelf and slope. EXPRESS data and information are intended to guide wise use of living marine resources and habitats, inform ocean energy and mineral resource decisions, and improve offshore hazard assessments.
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Pamlico Canyon

USGS Role in DEEP SEARCH: Deep Sea Exploration to Advance Research on Coral, Canyon, and Cold-seep Habitats

USGS scientists are collaborating with multiple agencies to provide the esssential foundation for understanding these deep-sea environments.
By
Ecosystems Mission Area, Land Management Research Program, Pacific Coastal and Marine Science Center, St. Petersburg Coastal and Marine Science Center, Wetland and Aquatic Research Center , Woods Hole Coastal and Marine Science Center, Deep Sea Exploration, Mapping and Characterization, Gulf of America
USGS Role in DEEP SEARCH: Deep Sea Exploration to Advance Research on Coral, Canyon, and Cold-seep Habitats

USGS Role in DEEP SEARCH: Deep Sea Exploration to Advance Research on Coral, Canyon, and Cold-seep Habitats

USGS scientists are collaborating with multiple agencies to provide the esssential foundation for understanding these deep-sea environments.
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Filter Total Items: 29

Stable isotope data for fauna, POM and sediments at 19 mesophotic coral habitats in the Gulf of America Stable isotope data for fauna, POM and sediments at 19 mesophotic coral habitats in the Gulf of America

Stable isotope dataset from fauna, particulate organic matter (POM) and sediments used to construct isotopic niches to compare trophic relationships in mesophotic coral habitats across the Gulf of America.
By
Wetland and Aquatic Research Center

Shotgun sequencing of multiple families of Polychaeta from U.S. Atlantic margin seeps and eDNA metabarcoding sequences of benthic community from Cascadia margin seeps using 18S marker, 2018–2019 Shotgun sequencing of multiple families of Polychaeta from U.S. Atlantic margin seeps and eDNA metabarcoding sequences of benthic community from Cascadia margin seeps using 18S marker, 2018–2019

Reported here are the geographic sampling information associated with the raw shotgun sequencing data of multiple families of Polychaeta samples collected from cold seep sites off the U.S. Atlantic margin as well as raw 18S amplicon sequencing data from sediment eDNA collected from Astoria Canyon seeps, located on the Cascadia margin, northeastern Pacific Ocean. Also included are GenBank...
By
Wetland and Aquatic Research Center

Sediment macrofaunal composition, stable isotopes, organic content, and grain size of the Cascadia margin (Pacific Ocean), June 2019 Sediment macrofaunal composition, stable isotopes, organic content, and grain size of the Cascadia margin (Pacific Ocean), June 2019

Dataset of sediment macrofaunal communities, geochemistry, and grain size associated with chemosynthetic and soft-sediment habitats along the Cascadia margin, Pacific Ocean, in 2019.
By
Wetland and Aquatic Research Center

Isotope data of vesicomyid clams collected in the Pacific Ocean off the Oregon coastline in 2019 Isotope data of vesicomyid clams collected in the Pacific Ocean off the Oregon coastline in 2019

Isotope data for vesicomyid clams collected in the Pacific Ocean off the Oregon coastline in 2019.
By
Wetland and Aquatic Research Center

Greater Everglades Burmese Python Stable Isotope Data and Standard Ellipse Area Literature Review Greater Everglades Burmese Python Stable Isotope Data and Standard Ellipse Area Literature Review

Burmese pythons are an invasive species in the Greater Everglades Ecosystem. Burmese pythons captured in the ecosystem are euthanized, and in an effort to learn about this invasive species, all euthanized pythons are necropsied, during which time samples are collected. We analyzed the stable isotope ratios of carbon and nitrogen in muscle samples from 423 Burmese pythons euthanized and...
By
Wetland and Aquatic Research Center

Timing of coral (Swiftia exserta) spawning in U.S.G.S. Wetland and Aquatic Research Center, Gainesville, FL Timing of coral (Swiftia exserta) spawning in U.S.G.S. Wetland and Aquatic Research Center, Gainesville, FL

The 2010 Deepwater Horizon oil spill injured mesophotic and deep-sea environments over a vast area. In order to restore the mesophotic and deep-sea coral species impacted by the spill, information on fundamental ecosystem processes such as reproduction is needed. During expeditions in 2021 and 2022, fragments of the mesophotic octocoral Swiftia exserta were collected from the northern...
By
Wetland and Aquatic Research Center

Stable isotope, seep megafauna video analysis, and macrofauna of submarine canyons, deep-sea corals and seep habitats in the western Atlantic from 2018-2019 Stable isotope, seep megafauna video analysis, and macrofauna of submarine canyons, deep-sea corals and seep habitats in the western Atlantic from 2018-2019

Datasets of the sediment grain size and geochemistry, macrofaunal communities, stable isotope (carbon, nitrogen, sulfur) and seep video analyses associated with deep-sea corals, submarine canyons and seep habitats in the western Atlantic off the U.S. eastern coastline from 2018-2019.
By
Wetland and Aquatic Research Center

Biological and environmental data collected in 2015 within mangrove habitats of Rookery Bay Preserve on Marco Island, FL. Biological and environmental data collected in 2015 within mangrove habitats of Rookery Bay Preserve on Marco Island, FL.

Mangrove restoration efforts often focus on planting seedlings and ignore the underlying physical parameters causing mangrove loss, such as disruption to the hydrological regime. In order to determine success of hydrological restoration, baseline data need to be collected and assessed from a degraded mangrove system undergoing hydrological restoration. Sample collection occurred within...
By
Wetland and Aquatic Research Center

Stable isotope data and terrain variables for isoscape modeling around two submarine canyons in the western Atlantic sampled in 2012-2013 Stable isotope data and terrain variables for isoscape modeling around two submarine canyons in the western Atlantic sampled in 2012-2013

Terrain variables extracted from bathymetry were used in combination with stable isotope datasets to construct geospatially-explicit isoscapes that predicted variation in carbon and nitrogen isotopes across the canyon-slope seascape, providing insights into the distribution and flow of energy resources, relevant to understanding whole community function.
By
Wetland and Aquatic Research Center

Oceanographic conditions at Richardson reef reveal new suitable habitat for cold-water corals Oceanographic conditions at Richardson reef reveal new suitable habitat for cold-water corals

Cold-water corals create complex structures, but our incomplete knowledge of their niche space limits our ability to understand their distribution and therefore the impact of the ecosystem services they provide in the ocean. The Richardson reef complex consists of over 150 km of linear reef tracts within an area of 75 km2 between 700-900 m depth. This reef experiences rapid shifts in...
By
Wetland and Aquatic Research Center

Isotope data from Shimada 2018 research expedition Isotope data from Shimada 2018 research expedition

Stable isotope data of fauna, particulate organic matter, and rocks collected during the 2018 research cruise aboard the NOAA Ship Bell M. Shimada that examined benthic communities off the western U.S. coast.
By
Wetland and Aquatic Research Center

Stable isotope and video observational data from the RL1905 EXPRESS expedition in 2019 Stable isotope and video observational data from the RL1905 EXPRESS expedition in 2019

Data to support the site characterization of locations sampled along the continental shelf and slope of the western U.S. coast off Washington, Oregon and California during the EXPRESS RL1905 expedition in 2019. Data consisted of tissue samples from fauna, sediments and particulate organic matter. These samples were analyzed for stable carbon and nitrogen isotopes to examine food web...
By
Wetland and Aquatic Research Center
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Filter Total Items: 83

Augmentation of French grunt diet description using combined visual and DNA-based analyses Augmentation 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
Authors
John S. Hargrove, Daryl C. Parkyn, Debra J. Murie, Amanda W.J. Demopoulos, James D. Austin
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Benthic community structure and composition in sediment from the northern Gulf of Mexico shoreline, Texas to Florida Benthic 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...
Authors
Amanda W.J. Demopoulos, Douglas G. Strom
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Deepwater Program: Studies of Gulf of Mexico lower continental slope communities related to chemosynthetic and hard substrate habitats Deepwater 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
Authors
Steve 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. Thaler
By
Ecosystems Mission Area, Environmental Health Program, St. Petersburg Coastal and Marine Science Center, Wetland and Aquatic Research Center , Gulf of America

Connectivity of tropical marine ecosystems--An overview of interdisciplinary research to understand biodiversity and trophic relationships in the Virgin Islands and Puerto Rico Connectivity 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...
Authors
Jennifer P. McClain-Counts, Amanda W.J. Demopoulos
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Impact of the Deepwater Horizon oil spill on a deep-water coral community in the Gulf of Mexico Impact 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...
Authors
Helen 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. Fisher
By
Ecosystems Mission Area, Wetland and Aquatic Research Center , Gulf of America

Comprehensive summary of beach renourishment and offshore sand removal impacts for Florida Comprehensive summary of beach renourishment and offshore sand removal impacts for Florida

This report is temporarily unavailable pending review.
Authors
A. W.J. Demopoulos, D.J. Gualtieri, A. Neils, D. Huge
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

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 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

No abstract available.
Authors
L. Nico, A. Demopoulos, D. Gualtieri, C. Wieser
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Impacts of exotic mangrove forests and mangrove deforestation on carbon remineralization and ecosystem functioning in marine sediments Impacts 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...
Authors
A. K. Sweetman, J. J. Middelburg, A. M. Berle, A. F. Bernardino, C. Schander, A. W.J. Demopoulos, C. R. Smith
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Food-web structure of seep sediment macrobenthos from the Gulf of Mexico Food-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...
Authors
Amanda W.J. Demopoulos, Daniel Gualtieri, Kaitlin Kovacs
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Use of multiple chemical tracers to define habitat use of Indo-Pacific mangrove crab, Scylla serrata (Decapoda: Portunidae) Use of multiple chemical tracers to define habitat use of Indo-Pacific mangrove crab, Scylla serrata (Decapoda: Portunidae)

The mangrove or mud crab, Scylla serrata, is an important component of mangrove fisheries throughout the Indo-Pacific. Understanding crab diets and habitat use should assist in managing these fisheries and could provide additional justification for conservation of the mangrove ecosystem itself. We used multiple chemical tracers to test whether crab movements were restricted to local...
Authors
A. W.J. Demopoulos, Nicole Cormier, K. C. Ewel, B. Fry
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Food web structure in exotic and native mangroves: A Hawaii-Puerto Rico comparison Food web structure in exotic and native mangroves: A Hawaii-Puerto Rico comparison

Plant invasions can fundamentally alter detrital inputs and the structure of detritus-based food webs. We examined the detrital pathways in mangrove food webs in native (Puerto Rican) and introduced (Hawaiian) Rhizophora mangle forests using a dual isotope approach and a mixing model. Based on trophic-level fractionation of 0-1??? for ?? 13C and 2-3??? for ?? 15N, among the invertebrates...
Authors
A. W.J. Demopoulos, B. Fry, C. R. Smith
By
Ecosystems Mission Area, Wetland and Aquatic Research Center

Non-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.01
ten 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.01
Morrison, 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. 404:51-67
Fry, 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.

Filter Total Items: 27
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