A5085740990- Oil Spill Detection and Mitigation
- Atmospheric and Environmental Gas Dynamics
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Geology and Paleoclimatology Research
- Marine and fisheries research
- Methane Hydrates and Related Phenomena
- Toxic Organic Pollutants Impact
- Coastal wetland ecosystem dynamics
- Marine and coastal ecosystems
- Hydrocarbon exploration and reservoir analysis
- Microbial Community Ecology and Physiology
- Marine and coastal plant biology
- Marine Bivalve and Aquaculture Studies
- Mercury impact and mitigation studies
- Marine and environmental studies
- Global Energy and Sustainability Research
- Oceanographic and Atmospheric Processes
- Microplastics and Plastic Pollution
- Environmental Toxicology and Ecotoxicology
- Coral and Marine Ecosystems Studies
- Cephalopods and Marine Biology
- Geological formations and processes
- Ocean Acidification Effects and Responses
- Plant and soil sciences
Universidad Nacional del Centro del Perú
2025
University of South Florida St. Petersburg
2015-2024
College of Marin
2015-2024
Florida College
2014-2022
University of South Florida
2015-2021
Oceanography Society
2016
University of West Florida
2015
Universidad del Valle
2006-2014
University of Southern California
2008-2011
Southern California University for Professional Studies
2008
The objective of this study was to investigate the impacts Deepwater Horizon (DWH) oil discharge at seafloor as recorded in bottom sediments DeSoto Canyon region northeastern Gulf Mexico. Through a close coupling sedimentological, geochemical, and biological approaches, multiple independent lines evidence from 11 sites sampled November/December 2010 revealed that upper ~1 cm depth interval is distinct underlying results indicate particles originated sea surface. Consistent dissimilarities...
The Deepwater Horizon (DWH) spill released 4.9 million barrels of oil into the Gulf Mexico (GoM) over 87 days. Sediment and water sampling efforts were concentrated SW DWH in coastal areas. Here we present geochemistry data from sediment cores collected aftermath event 1000 – 1500 m depth DeSoto Canyon, NE wellhead. Cores analyzed at high-resolution (at 2 mm 5 intervals) order to evaluate concentration, composition input hydrocarbons seafloor. Specifically, total organic carbon (TOC),...
The blowout of the Deepwater Horizon (DWH) drilling rig in 2010 released an unprecedented amount oil at depth (1,500 m) into Gulf Mexico (GoM). Sedimentary geochemical data from extensive area (∼194,000 km2) was used to characterize amount, chemical signature, distribution, and extent DWH deposited on seafloor 2010-2011 coastal deep-sea areas GoM. analysis numerous hydrocarbon compounds (N = 158) sediment cores 2,613) suggests that, 1.9 ± 0.9 × 104 metric tons hydrocarbons (>C9 saturated...
We use a spatially explicit biogeochemical end-to-end ecosystem model, Atlantis, to simulate impacts from the Deepwater Horizon oil spill and subsequent recovery of fish guilds. Dose-response relationships with expected concentrations were utilized estimate impact on growth mortality rates. also examine effects fisheries closures recruitment. validate predictions model by comparing population trends age structure before after independent data. The suggests that recruitment fishery had little...
Echinoderm mass mortality events shape marine ecosystems by altering the dynamics among major benthic groups. The sea urchin Diadema antillarum, virtually extirpated in Caribbean early 1980s an unknown cause, recently experienced another beginning January 2022. We investigated cause of this event through combined molecular biological and veterinary pathologic approaches comparing grossly normal abnormal animals collected from 23 sites, representing locations that were either affected or...
Sediment cores were collected from three sites (1000–1200 m water depth) in the northeastern Gulf of Mexico December 2010 to June 2011 assess changes benthic foraminiferal density related Deepwater Horizon (DWH) event (April-July 2010, 1500 depth). Short-lived radioisotope geochronologies (210Pb, 234Th), organic geochemical assessments, and redox metal concentrations determined relate sediment accumulation rate, contamination, conditions with density. Cores indicated a decline (80–93%). This...
Following the blowout of Macondo well, a pulse in sedimentation resulted changes sedimentary redox conditions. This is demonstrated by downcore and temporal concentration sensitive metals: Mn, Re, Cd. Sediment cores collected NE Gulf Mexico (GoM) reveal increased after Deepwater Horizon (DWH) blowout. The formation mucous-rich marine snow surface waters subsequent rapid deposition to underlying sediments likely cause. Respiration this material decreased pore-water oxygen shoaled redoxcline,...
This study characterizes a decadal assessment of polycyclic aromatic hydrocarbons (PAHs) in the muscle tissues mesopelagic fish species as indicators environmental health Gulf Mexico (GoM) deep-pelagic ecosystem. Mesopelagic fishes were collected prior to Deepwater Horizon (DWH) oil spill (2007), immediately post-spill (2010), 1 year after (2011), and 5–6 years (2015–2016) assess if ecosystem was exposed to, retained, PAH compounds from DWH spill. Results indicated that 7- 10-fold increase...
The Deepwater Horizon blowout in April 2010 represented the largest accidental marine oil spill and release of chemical dispersants into environment to date. While dispersant application may provide numerous benefits response efforts, impacts potential synergistic effects with crude on individual hydrocarbon-degrading bacteria are poorly understood. In this study, two environmentally relevant species were utilized quantify Macondo Corexit 9500A-dispersed terms bacterial growth degradation...
Despite the significance of plankton in contributing to stability marine food webs, there is surprisingly little pre-Deepwater Horizon baseline information on seasonal and interannual variability species composition dynamics northeastern Gulf Mexico with which evaluate impacts oil spill.". FIGURE 3. Cumulative distribution surface as observed from satellites (gray shading), spatial extent federal fishery closures July 3 October 15, 2010, February 2, 2011 (SERO, 2015)).Station locations for...
Background Because of illegal logging, habitat fragmentation, and high value timber Andean montane forest Cedrela species (such as angustifolia ), is endangered in Central South America. Studying the effects climate change tree cover loss on distribution C. will help us to understand climatic ecological sensitivity this suggest conservation restoration strategies. Methods Using niche modeling with two algorithms (maximum entropy (MaxEnt) Random Forest) under conservatism approach, we...
Abstract. Extremes in δ15N values mangrove tissues and lichens (range =+4 to −22‰) were measured from a forest ecosystem located on Twin Cays, offshore islands Belize, Central America. The N isotopic compositions concentrations of NH4+/NH3 porewater, rainwater, atmospheric ammonia, the lichens, leaves, roots, stems, wood examined study biogeochemical processes important for establishing these unusual ratios. Dwarfed Rhizophora mangle trees had most negative δ15N, whereas fringing trees,...
Abstract The bioavailability of nutrients is important in controlling ecological processes and nitrogen cycling oligotrophic mangrove forests, yet the variation diazotrophic community structure activity with nutrient availability sediments remains largely unexplored. To investigate for first time how affect spatial temporal patterns activity, sedimentary environment Twin Cays, Belize, was examined respect to effects long‐term fertilization [treatments: control (Ctrl), (N), phosphorus (P)] on...
The response of N2 fixation and NO3- uptake to environmental conditions nutrient enrichment experiments in three western U.S. lake systems was studied (eutrophic Clear Lake; mesotrophic Walker oligotrophic Lake Tahoe). We tested the effect additions bioactive trace metals iron (Fe) molybdenum as Mo(V)), well phosphate (P), on these two processes, carbon fixation, Chl a bacterial cell counts under both natural mesocosm experiments. found distinct background rates: highest at (N2 fixation:...
The pelagic Gulf of Mexico (GoM) is a complex system dynamic physical oceanography (western boundary current, mesoscale eddies), high biological diversity, and community integration via diel vertical migration lateral advection. Humans also heavily utilize this system, including its deep-sea components, for resource extraction, shipping, tourism, other commercial activity. This utilization has had impacts, some with disastrous consequences. Deepwater Horizon oil spill (DWHOS) occurred at...
Abstract On 23 July 2013, a marine gas rig ( Hercules 265 ) ignited in the northern Gulf of Mexico. The burned out control for 2 days before being extinguished. We conducted rapid‐response sampling campaign near after fire to ascertain if sediments and fishes were polluted above earlier baseline levels. A surface drifter study confirmed that ocean water flowed southeast site, while atmospheric plume generated by blowout was eastward direction. Sediment cores collected SE at distance ∼0.2, 8,...
Aquatic sediment core subsampling is commonly performed at cm or half-cm resolution. Depending on the sedimentation rate and depositional environment, this resolution provides records annual to decadal scale, best. An extrusion method, using a calibrated, threaded-rod presented here, which allows for millimeter-scale of aquatic cores varying diameters. Millimeter scale sub-annual monthly analysis sedimentary record, an order magnitude higher than typical sampling schemes. The extruder...