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https://www.readbyqxmd.com/read/28535489/large-scale-deposition-of-weathered-oil-in-the-gulf-of-mexico-following-a-deep-water-oil-spill
#1
Isabel C Romero, Gerardo Toro-Farmer, Arne-R Diercks, Patrick Schwing, Frank Muller-Karger, Steven Murawski, David J Hollander
The blowout of the Deepwater Horizon (DWH) drilling rig in 2010 released an unprecedented amount of oil at depth (1,500 m) into the Gulf of Mexico (GoM). Sedimentary geochemical data from an extensive area (∼194,000 km(2)) was used to characterize the amount, chemical signature, distribution, and extent of the DWH oil deposited on the seafloor in 2010-2011 from coastal to deep-sea areas in the GoM. The analysis of numerous hydrocarbon compounds (N = 158) and sediment cores (N = 2,613) suggests that, 1...
May 20, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28535299/analysis-of-bacterial-metagenomes-from-the-southwestern-gulf-of-mexico-for-pathogens-detection
#2
Wendy Escobedo-Hinojosa, Liliana Pardo-López
Little is known about the diversity of bacteria in the Southwestern Gulf of Mexico. The aim of the study illustrated in this perspective was to search for the presence of bacterial pathogens in this ecosystem, using metagenomic data recently generated by the Mexican research group known as the Gulf of Mexico Research Consortium. Several genera of bacteria annotated as pathogens were detected in water and sediment marine samples. As expected, native and ubiquitous pathogenic bacteria genera such as Burkolderia, Halomonas, Pseudomonas, Shewanella, and Vibrio were highly represented...
May 23, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28526900/abundance-of-corals-on-offshore-oil-and-gas-platforms-in-the-gulf-of-mexico
#3
Stephan R Kolian, Paul W Sammarco, Scott A Porter
Scleractinian, octocoral, and antipatharian corals have colonized many of the offshore oil and gas platforms in the northern Gulf of Mexico. We surveyed 25 offshore oil and gas platforms for these cnidarians. Few to no corals were detected on inshore, shallow-water structures at <25 m depth; however, the abundance of corals increased, ranging from 14 to 194/m(2), on platforms in waters deeper ≥25 m. The most common coral encountered were Tubastraea coccinea (Scleractinia) and Telesto spp. (Octocorallia)...
May 19, 2017: Environmental Management
https://www.readbyqxmd.com/read/28526170/body-mass-change-in-flying-homing-pigeons-externally-exposed-to-deepwater-horizon-crude-oil
#4
Cristina R Perez, John K Moye, Dave Cacela, Karen M Dean, Chris A Pritsos
The Deepwater Horizon oil spill contaminated thousands of miles of habitat valuable to hundreds of species of migratory and resident birds of the Gulf of Mexico. Many birds died as a direct result of the oil spill; however, the indirect effects of oil exposure on the flight ability and body condition of birds are difficult to assess in situ. This study utilizes the homing pigeon as a surrogate species for migratory birds to investigate the effect of multiple external oil exposures on the flight performance and body mass change of birds over a series of repeated flights from 136...
May 16, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28525868/biotransformation-of-natural-gas-and-oil-compounds-associated-with-marine-oil-discharges
#5
Odd Gunnar Brakstad, Inger K Almås, Daniel Franklin Krause
Field data from the Deepwater Horizon (DWH) oil spill in the Gulf of Mexico (GoM) suggested that oxidation of gas compounds stimulated biodegradation of oil compounds in the deep sea plume. We performed experiments with local seawater from a Norwegian fjord to examine if the presence of dissolved gas compounds (methane, ethane and propane) affected biodegradation of volatile oil compounds, and if oil compounds likewise affected gas compound oxidation. The results from the experiment showed comparable oil compound biotransformation rates in seawater at 5 °C between seawater with and without soluble gases...
May 11, 2017: Chemosphere
https://www.readbyqxmd.com/read/28522997/biogeographic-comparison-of-lophelia-associated-bacterial-communities-in-the-western-atlantic-reveals-conserved-core-microbiome
#6
Christina A Kellogg, Dawn B Goldsmith, Michael A Gray
Over the last decade, publications on deep-sea corals have tripled. Most attention has been paid to Lophelia pertusa, a globally distributed scleractinian coral that creates critical three-dimensional habitat in the deep ocean. The bacterial community associated with L. pertusa has been previously described by a number of studies at sites in the Mediterranean Sea, Norwegian fjords, off Great Britain, and in the Gulf of Mexico (GOM). However, use of different methodologies prevents direct comparisons in most cases...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28510105/agrochemical-loading-in-drains-and-rivers-and-its-connection-with-pollution-in-coastal-lagoons-of-the-mexican-pacific
#7
Omar Arellano-Aguilar, Miguel Betancourt-Lozano, Gabriela Aguilar-Zárate, Claudia Ponce de Leon-Hill
The state of Sinaloa in Mexico is an industrialized agricultural region with a documented pesticide usage of 700 t year(-1); which at least 17 of the pesticides are classified as moderately to highly toxic. Pollutants in the water column of rivers and drains are of great concern because the water flows into coastal lagoons and nearshore waters and thereby affects aquatic organisms. This study was done in four municipalities in the state of Sinaloa that produce food intensively. To investigate the link between pollution in the lagoons and their proximity to agricultural sites, water was sampled in three coastal lagoons and in the rivers and drains that flow into them...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28502626/organic-matter-in-surface-sediments-from-the-gulf-of-mexico-and-south-china-sea-compositions-distributions-and-sources
#8
Cuiping Wang, Weili Jia, Dong Wang, Zhiguang Song
Sediments from the Gulf of Mexico (GOM) and the South China Sea (SCS) were analyzed. The low δ(13) C values of pentamethylicosane (PMIs) and fatty acids (-81.3 to -85.2‰) were found in only the S-1 sample collected from the GOM, indicating that methanogenic archaea associated with gas hydrate formation contributed to the sediment organic matter. Principle component analysis of fatty acids suggested that similar microbial biomass was found in the S-1, S-9, O-3 and O-5 samples. However, a comparison of the alkanes, fatty acids, and alcohols indicated that the percentage of n-alkan-2-ols in the S-1 sample from the GOM was the highest, while n-alkanes and n-fatty acids were the highest percentages in other samples from the GOM and SCS...
May 11, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28502163/constraining-the-spatial-extent-of-marine-oil-snow-sedimentation-and-flocculent-accumulation-mossfa-following-the-deepwater-horizon-event-using-an-excess-210pb-flux-approach
#9
Patrick Thomas Schwing, Gregg R Brooks, Rebekka Larson, Charles Holmes, Bryan O'Malley, David J Hollander
Following the Deepwater Horizon (DWH) event in 2010, there were several lines of evidence indicating the presence of Marine Oil Snow Sedimentation and Flocculent Accumulation (MOSSFA). A significant amount of marine oil snow formed in the water column of the northern Gulf of Mexico (nGoM), settled rapidly and ultimately accumulated in the sediments of the nGoM. This study utilized a commonly used radioisotope tracer (excess 210Pb, 210Pbxs) from 32 sediment cores collected from 2010-2013 to characterize the spatial extent of MOSSFA on the seafloor...
May 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28500397/analysis-of-lethal-and-sublethal-impacts-of-environmental-disasters-on-sperm-whales-using-stochastic-modeling
#10
Azmy S Ackleh, Ross A Chiquet, Baoling Ma, Tingting Tang, Hal Caswell, Amy Veprauskas, Natalia Sidorovskaia
Mathematical models are essential for combining data from multiple sources to quantify population endpoints. This is especially true for species, such as marine mammals, for which data on vital rates are difficult to obtain. Since the effects of an environmental disaster are not fixed, we develop time-varying (nonautonomous) matrix population models that account for the eventual recovery of the environment to the pre-disaster state. We use these models to investigate how lethal and sublethal impacts (in the form of reductions in the survival and fecundity, respectively) affect the population's recovery process...
May 12, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/28487163/a-multi-year-study-of-hepatic-biomarkers-in-coastal-fishes-from-the-gulf-of-mexico-after-the-deepwater-horizon-oil-spill
#11
Marci Smeltz, Laura Rowland-Faux, Céline Ghiran, William F Patterson, Steven B Garner, Alan Beers, Quentin Mièvre, Andrew S Kane, Margaret O James
Following the 2010 Gulf of Mexico oil spill, concerns were raised regarding exposure of fish to crude oil components, particularly polycyclic aromatic hydrocarbons (PAHs). This three year study examined hepatic enzymes in post-mitochondrial supernatant fractions from red snapper (Lutjanus campechanus) and gray triggerfish (Balistes capriscus) collected in the north central Gulf of Mexico between 2011 and 2014. Biomarker activities evaluated included benzo(a)pyrene hydroxylase (AHH), ethoxyresorufin O-deethylase (EROD), glutathione transferase (GST), and glutathione peroxidase (GPx)...
April 27, 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28484673/oceanic-adults-coastal-juveniles-tracking-the-habitat-use-of-whale-sharks-off-the-pacific-coast-of-mexico
#12
Dení Ramírez-Macías, Nuno Queiroz, Simon J Pierce, Nicolas E Humphries, David W Sims, Juerg M Brunnschweiler
Eight whale sharks tagged with pop-up satellite archival tags off the Gulf of California, Mexico, were tracked for periods of 14-134 days. Five of these sharks were adults, with four females visually assessed to be pregnant. At least for the periods they were tracked, juveniles remained in the Gulf of California while adults moved offshore into the eastern Pacific Ocean. We propose that parturition occurs in these offshore waters. Excluding two juveniles that remained in the shallow tagging area for the duration of tracking, all sharks spent 65 ± 20...
2017: PeerJ
https://www.readbyqxmd.com/read/28484435/role-of-eps-dispersant-and-nutrients-on-the-microbial-response-and-mos-formation-in-the-subarctic-northeast-atlantic
#13
Laura Duran Suja, Stephen Summers, Tony Gutierrez
In this study we report the formation of marine oil snow (MOS), its associated microbial community, the factors influencing its formation, and the microbial response to crude oil in surface waters of the Faroe-Shetland Channel (FSC). The FSC is a subarctic region that is hydrodynamically complex located in the northeast Atlantic where oil extraction is currently occurring and where exploration is likely to expand into its deeper waters (>500 m). A major oil spill in this region may mirror the aftermath that ensued following the Deepwater Horizon (DWH) blowout in the Gulf of Mexico, where the massive influx of Macondo crude oil triggered the formation of copious quantities of rapidly sinking MOS and successional blooms of opportunistic oil-degrading bacteria...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28476353/application-of-an-integrated-blowout-model-system-oilmap-deep-to-the-deepwater-horizon-dwh-spill
#14
Malcolm Spaulding, Zhengkai Li, Daniel Mendelsohn, Deborah Crowley, Deborah French-McCay, Andrew Bird
OILMAP DEEP, an integrated system of models (pipeline release, blowout plume, dispersant treatment, oil droplet size distribution, and fountain and intrusion), was applied to the Deepwater Horizon (DWH) oil spill to predict the near field transport and fate of the oil and gas released into the northeastern Gulf of Mexico. The model included multiple, time dependent releases from both the kink and riser, with the observed subsurface dispersant treatment, that characterized the DWH spill and response. The blowout model predictions are in good agreement with the available observations for plume trapping height and the major characteristics of the intrusion layer...
May 3, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28473211/effects-of-crude-oil-and-oil-dispersant-mixture-on-growth-and-expression-of-vitellogenin-and-heat-shock-protein-90-in-blue-crab-callinectes-sapidus-juveniles
#15
Susan C Chiasson, Caz M Taylor
The 2010 Deepwater Horizon (DWH) oil spill in the northern Gulf of Mexico (NGOM) resulted in over 780million liters of crude oil spilling into Gulf waters. In an effort to disperse the oil, nearly 7.6million liters of dispersant was applied. Many commercially and recreationally important species reside in or near the area of the spill. The blue crab, Callinectes sapidus, is common in the NGOM and is both economically and ecologically important in this region. In this study, after exposing juvenile blue crabs to oil or a mixture of oil and dispersant we tested for relative expression of heat shock protein 90 (hsp90) and vitellogenin (vtg) by measuring their corresponding mRNA expression...
May 1, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28464028/crude-oil-impairs-immune-function-and-increases-susceptibility-to-pathogenic-bacteria-in-southern-flounder
#16
Keith M Bayha, Natalie Ortell, Caitlin N Ryan, Kimberly J Griffitt, Michelle Krasnec, Johnny Sena, Thiruvarangan Ramaraj, Ryan Takeshita, Gregory D Mayer, Faye Schilkey, Robert J Griffitt
Exposure to crude oil or its individual constituents can have detrimental impacts on fish species, including impairment of the immune response. Increased observations of skin lesions in northern Gulf of Mexico fish during the 2010 Deepwater Horizon oil spill indicated the possibility of oil-induced immunocompromisation resulting in bacterial or viral infection. This study used a full factorial design of oil exposure and bacterial challenge to examine how oil exposure impairs southern flounder (Paralichthys lethostigma) immune function and increases susceptibility to the bacteria Vibrio anguillarum, a causative agent of vibriosis...
2017: PloS One
https://www.readbyqxmd.com/read/28451874/characterization-of-32-microsatellite-loci-for-the-pacific-red-snapper-lutjanus-peru-through-next-generation-sequencing
#17
David A Paz-García, Adrián Munguía-Vega, Tomas Plomozo-Lugo, Amy Hudson Weaver
We developed a set of hypervariable microsatellite markers for the Pacific red snapper (Lutjanus peru), an economically important marine fish for small-scale fisheries in the west coast of Mexico. We performed shotgun genome sequencing with the 454 XL titanium chemistry and used bioinformatic tools to search for perfect microsatellite loci. We selected 66 primer pairs that were synthesized and genotyped in an ABI PRISM 3730XL DNA sequencer in 32 individuals from the Gulf of California. We estimated levels of genetic diversity, deviations from linkage and Hardy-Weinberg equilibrium, estimated the frequency of null alleles and the probability of individual identity for the new markers...
April 27, 2017: Molecular Biology Reports
https://www.readbyqxmd.com/read/28445091/comparative-molecular-and-morphological-variation-analysis-of-siderastrea-anthozoa-scleractinia-reveals-the-presence-of-siderastrea-stellata-in-the-gulf-of-mexico
#18
Norberto A Colín García, Jorge E Campos, José L Tello Musi, Zac H Forsman, Jorge L Montero Muñoz, Alejandro Monsalvo Reyes, Jesús E Arias González
The genus Siderastrea exhibits high levels of morphological variability. Some of its species share similar morphological characteristics with congeners, making their identification difficult. Siderastrea stellata has been reported as an intermediary of S. siderea and S. radians in the Brazilian reef ecosystem. In an earlier study conducted in Mexico, we detected Siderastrea colonies with morphological features that were not consistent with some siderastreid species previously reported in the Gulf of Mexico...
February 2017: Biological Bulletin
https://www.readbyqxmd.com/read/28434667/sedimentary-heavy-metal-loid-contamination-in-the-veracruz-shelf-gulf-of-mexico-a-baseline-survey-from-a-rapidly-developing-tropical-coast
#19
Omar Celis-Hernandez, Leticia Rosales-Hoz, Andrew B Cundy, Arturo Carranza-Edwards
This study examines sediment texture, geochemistry and sediment accumulation in cores from four sites in the Veracruz shelf area of the Gulf of Mexico, to assess the inputs of heavy metal(loid)s (and their potential biological impacts) in this carbonate-dominated shelf system, and to examine the rate of sedimentation near to the mouths of the La Antigua and Jamapa Rivers. The use of different pollution indices showed enrichment with Pb in all cores studied, although based on sediment quality guidelines As was the only element that has potential to occasionally cause damage to the benthic organisms present in the area...
April 20, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28426421/redescription-of-philometra-margolisi-moravec-vidal-mart%C3%A3-nez-et-aguirre-macedo-1995-nematoda-philometridae-a-gonad-infecting-parasite-of-the-red-grouper-epinephelus-morio-serranidae-in-the-gulf-of-mexico
#20
František Moravec, Micah D Bakenhaster, Erin H Leone
The insufficiently known nematode species Philometra margolisi Moravec, Vidal-Martínez et Aguirre-Macedo, 1995 (Philometridae) is redescribed based on light and scanning electron microscopical (SEM) examinations of specimens collected from the gonad of the type host, the red grouper Epinephelus morio (Valenciennes) (Serranidae, Perciformes), in the northern Gulf of Mexico off Florida, USA. Also, new prevalence data for females of P. margolisi were derived from 188 fish, and a subset of these (n = 38) were used to determine prevalence and intensity of male nematodes...
June 1, 2017: Acta Parasitologica
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