A5038600909- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Toxic Organic Pollutants Impact
- Oil Spill Detection and Mitigation
- Marine Biology and Ecology Research
- Microbial bioremediation and biosurfactants
- Isotope Analysis in Ecology
- Ocean Acidification Effects and Responses
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Marine Bivalve and Aquaculture Studies
- Microplastics and Plastic Pollution
- Coastal wetland ecosystem dynamics
- Mass Spectrometry Techniques and Applications
- Metabolomics and Mass Spectrometry Studies
- Petroleum Processing and Analysis
- Recycling and Waste Management Techniques
- Oceanographic and Atmospheric Processes
- Marine and fisheries research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Coastal and Marine Management
- Groundwater and Isotope Geochemistry
- Protein Hydrolysis and Bioactive Peptides
- Aquaculture Nutrition and Growth
- Hydrocarbon exploration and reservoir analysis
The University of Texas at Austin
2015-2024
Jiangxi University of Science and Technology
2023
University of Electronic Science and Technology of China
2021
Lingnan Normal University
2021
Old Dominion University
2008-2017
Jinan University
2012
Stony Brook University
2005-2010
The oil released during the Deepwater Horizon (DWH) spill may have both short- and long-time impacts on northern Gulf of Mexico ecosystems. An understanding how composition concentration are altered by weathering, including chemical, physical biological processes, is needed to evaluate toxicity impact ecosystem in Mexico. This study examined petroleum hydrocarbons mousse collected from sea surface salt marshes, deposited sediments adjacent wellhead after DWH spill. Oil mousses were at two...
Using 15N stable isotope as a tracer to quantify N transformation rates in isotope-enrichment experiments improves understanding of the cycle various ecosystems. However, measuring 15N-nitrate (15NO3−) small volumes water for these is major challenge due inconvenience preparing samples by traditional techniques. We developed "REOX/MIMS" method applying membrane inlet mass spectrometry (MIMS) determining 15NO3− concentrations from after converting dissolved inorganic N2. The nitrates (NO3− +...
We conducted ship-, shore- and laboratory-based crude oil exposure experiments to investigate (1) the effects of (Louisiana light sweet oil) on survival bioaccumulation polycyclic aromatic hydrocarbons (PAHs) in mesozooplankton communities, (2) lethal dispersant (Corexit 9500A) dispersant-treated mesozooplankton, (3) influence UVB radiation/sunlight toxicity dispersed (4) role marine protozoans sublethal PAHs copepod Acartia tonsa. Mortality increased with increasing concentration following...
Nitrogen (N) pollution in aquatic ecosystems has attracted much attention over the past decades, but dynamics of this bioreactive element are difficult to measure oxygen-transition environments. Nitrogen-transformation experiments often require measurement (15)N-ammonium ((15)NH4(+)) ratios small-volume (15)N-enriched samples. Published methods determine N isotope dissolved ammonium large samples and/or costly equipment and effort. We present a novel ("OX/MIMS") method for (15)NH4(+)...
Abstract Bacterial community structures were evaluated in oil samples using culture‐independent pyrosequencing, including mousses collected on sea surface and salt marshes during the Deepwater Horizon spill, deposited sediments adjacent to wellhead 1 year after spill. Phylogenetic analysis suggested that Erythrobacter , Rhodovulum Stappia, Thalassospira of Alphaproteobacteria prevailing groups mousses, which may relate high temperatures strong irradiance Gulf waters. In mousse from leaves...
We apply multivariate statistics to explore the large data sets encountered from Fourier transform ion cyclotron resonance mass spectra of dissolved organic matter (DOM). Molecular formula assignments for individual constituents DOM are examined by hierarchal cluster analysis (HCA) and principal component (PCA), measure relationships between numerous samples. compare two approaches: (1) using averages elemental ratios double bond equivalents calculated formulas, (2) employing formulas either...
Gelatinous zooplankton play an important role in marine food webs both as major consumers of metazooplankton and prey apex predators (e.g., tuna, sunfish, sea turtles). However, little is known about the effects crude oil spills on these components planktonic communities. We determined Louisiana light sweet exposure survival bioaccumulation polycyclic aromatic hydrocarbons (PAHs) adult stages scyphozoans Pelagia noctiluca Aurelia aurita ctenophore Mnemiopsis leidyi, ephyra larvae A. cydippid...
Understanding bacterial community dynamics as a result of an oil spill is important for predicting the fate released to environment and developing bioremediation strategies in Gulf Mexico. In this study, we aimed elucidate roles temperature, water chemistry (nutrients), initial selecting degraders through series incubation experiments. Surface (2 m) bottom (1537 water, collected near Deepwater Horizon site, were amended with 200 ppm light Louisiana sweet crude inoculums from surface or...
Understanding residence times of plastic in the ocean is a major knowledge gap pollution studies. Observations report large mismatch between load estimates from worldwide production and disposal actual plastics floating at sea surface. Surveys water column, surface to deep sea, are rare. Most recent work, therefore, addressed "missing plastic" question using modeling or laboratory approaches proposing biofouling degradation as main removal processes ocean. Through organic matrices, can...
In the context of an increasing atmospheric carbon dioxide (CO2) level, acidification estuarine and coastal waters is greatly exacerbated by land-derived nutrient inputs, upwelling, complex biogeochemical processes. A deeper understanding how nitrifiers respond to intensifying thus crucial predict response ecosystems their contribution global climate change. Here, we show that can significantly decrease nitrification rate but stimulate generation byproduct nitrous oxide (N2O) in waters. By...
The analysis of dissolved organic matter (DOM) by Fourier transform ion cyclotron resonance mass spectrometry (FTICR‐MS) has gained wide interest recently, driven primarily its ultrahigh resolving power and accuracy. Accurate calibration spectra is a key step to successfully decipher the DOM components. We propose simple accurate method internally calibrate peaks in complex without need add calibrant. Mass samples from Dismal Swamp, Virginia, lower Chesapeake Bay display presence naturally...
Abstract Background Coastal sediments in the northern Gulf of Mexico have a high potential being contaminated by petroleum hydrocarbons, such as polycyclic aromatic hydrocarbons (PAHs), due to extensive exploration and transportation activities. In this study we evaluated spatial distribution contamination sources PAHs, well bioavailable fraction bulk PAH pool, surface marsh shelf (top 5 cm) Mexico. Results concentrations region ranged from 100 856 ng g −1 , with highest Mississippi River...
Following the Deepwater Horizon (DWH) spill in 2010, an enormous amount of oil was observed deep and surface waters northern Gulf Mexico. Surface are characterized by intense sunlight high temperature during summer. While oil-degrading bacterial communities deep-sea plume have been widely investigated, effect natural on those polluted remains unexplored to date. In this study, we incubated water from DWH site with amendments crude oil, Corexit dispersant, or both for 36 d under The community...
Deciphering molecular structures of dissolved organic matter (DOM) components is key to understanding the formation and transformation this globally important carbon pool in aquatic environments. Such a task depends on integrated use complementary analytical techniques. We characterize structure natural DOM using an ion mobility quadrupole time flight liquid chromatography mass spectrometer (IM Q-TOF LC/MS), which provides multidimensional structural information molecules. Geometric...
Cyanobacterial harmful algal blooms (CyanoHABs) are enhanced by anthropogenic pressures, including excessive nutrient (nitrogen, N, and phosphorus, P) inputs a warming climate. Severe eutrophication in aquatic systems is often manifested as non-N2-fixing CyanoHABs (e.g., Microcystis spp.), but the biogeochemical relationship between N inputs/dynamics needs definition. Community biological ammonium (NH4+) demand (CBAD) relates dynamics to total microbial productivity NH4+ deprivation systems....
Settling particles were collected from the Ligurian Sea in northwestern Mediterranean May 2003 and separated by elutriation into different settling velocity classes (>230, 115–230, 58–115, <58 m d −1 ). Particles of incubated for 5 to study their biodegradability. Particulate opal content organic compound composition (amino acids, pigments, lipids, carbohydrates) analyzed initially at regular time intervals during incubation period. Most (48–67% total mass) sank greater than 230...