Article
Multidisciplinary Sciences
Kelly M. Correia, Scott B. Alford, Benjamin A. Belgrad, Kelly M. Darnell, M. Zachary Darnell, Bradley T. Furman, Margaret O. Hall, Christian T. Hayes, Charles W. Martin, Ashley M. McDonald, Delbert L. Smee
Summary: Drift macroalgae, commonly found in seagrass meadows in the northern Gulf of Mexico, have significant effects on the habitat value of seagrass ecosystems.
Article
Multidisciplinary Sciences
Lixin Qu, Leif N. Thomas, Aaron F. Wienkers, Robert D. Hetland, Daijiro Kobashi, John R. Taylor, Fucent Hsuan Wei Hsu, Jennifer A. MacKinnon, R. Kipp Shearman, Jonathan D. Nash
Summary: This study reveals that the summer land-sea breeze interacts with the river plume fronts in the northern Gulf of Mexico, leading to rapid vertical exchange and ventilation, which may impact the dynamics of the region's dead zone.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Chuanmin Hu, Lin Qi, Menghua Wang, Young-Je Park
Summary: Remote sensing and spectroscopy techniques were used to detect and quantify floating debris after Hurricane Katrina, providing a way for post-hurricane environmental assessment. Satellite images and imaging spectroscopy revealed the distribution and types of debris in the northern Gulf of Mexico, suggesting it was mainly composed of driftwood and dead plants mixed with plastics and other materials. The maximal debris area reached a historical record when measured by area in satellite images.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Yingjie Li, Samuel V. J. Robinson, Lan H. Nguyen, Jianguo Liu
Summary: The increasing frequency and severity of coastal hypoxia pose a significant threat to marine ecosystems and human well-being. It is crucial to implement continuous and comprehensive monitoring using advanced tools to track spatial and temporal changes in coastal hypoxia. This study utilized satellite imagery and statistical modeling techniques to estimate the spatiotemporal dynamics of hypoxia in the Gulf of Mexico. The results revealed the influence of surface water processes on bottom water hypoxia, highlighting the need for considering time lags in hypoxia studies. Additionally, the study demonstrated the potential of satellite remote sensing for accurate and real-time hypoxia mapping.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Oceanography
Michel Boufade, Annalisa Bracco, Eric P. . Chassignet, Shuyi S. Chen, Eric D'Asaro, William K. Dewar, Oscar Garcia-Pineda, Dubravko Justi, Joseph Katz, Vassiliki H. . Kourafa, Ian R. MacDonald, Tamay M. . Ozgokmen, Claire B. Paris-Limouzy, Scott S. Socolofsky, David Halpern, John G. . Shepherd
Summary: Physical transport processes in the ocean determine the spatial distribution of materials, influencing biological, geological, and chemical processes. The Gulf of Mexico's physical processes are influenced by wind and river currents, and have strong connections between coastal and deeper offshore waters, impacting material transport and connectivity to adjacent basins.
Article
Environmental Sciences
Kesley J. Gibson, Matthew K. Streich, Tara S. Topping, Gregory W. Stunz
Summary: This study used satellite telemetry to track the movements of shortfin mako sharks in the western Gulf of Mexico, revealing that mature sharks utilize a wider area than juveniles, with two mature males demonstrating seasonal migrations.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Oceanography
Wokil Bam, Kanchan Maiti
Summary: The study investigates the vertical fluxes of POC in the continental slope of the northern Gulf of Mexico using short-lived radionuclide pair 210Po - 210Pb. The results show that in the upper 150 m of the water column, the inventories of 210Pb were consistently greater than those of 210Po, while the total overall water column inventories of 210Po and 210Pb were near equilibrium. The fluxes of 210Po varied between 9.8 +/- 6.34 dpm m-2 d-1 and 30.7 +/- 12.06 dpm m-2 d-1 with corresponding POC fluxes between 8.6 mg C m-2 d-1 and 37.65 mg C m-2 d-1.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2021)
Article
Geosciences, Multidisciplinary
Fabian A. Gomez, Rik Wanninkhof, Leticia Barbero, Sang-Ki Lee
Summary: This study used an ocean-biogeochemical model to assess the spatiotemporal patterns of ocean acidification in the Gulf of Mexico from 1981 to 2014. The findings show that alkalinity from the Mississippi-Atchafalaya River System counteracted the progression of ocean acidification.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Mark G. Rowan
Summary: This study uses 3-D, depth-migrated seismic data to analyze the structural architecture and evolution of eastern Mississippi Canyon in the northeastern Gulf of Mexico. The study finds that the movement of salt in this area was driven by a combination of gravity and differential loading forces, which varied in importance and direction over time. These findings are significant for understanding the more complex structures and evolution of the northern Gulf of Mexico.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Ecology
Mercedes Yamily Chi Chan, Oscar Sosa-Nishizaki, Juan Carlos Perez-Jimenez
Summary: Understanding the overlap between fishing operations and the distribution of exploited populations is crucial for population assessments and management measures. Ecological niche models were used to estimate the potential distribution of hammerhead sharks in the southern Gulf of Mexico, revealing high environmental suitability for bonnethead and great hammerhead sharks in shallow and intermediate waters, and for scalloped hammerhead in intermediate and deep waters within the continental shelf.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Oceanography
Christopher T. Hayes, Alan M. Shiner, Scott P. Milroy
Summary: This study compares the dissolved Th-232 fluxes in the Gulf of Mexico and the North Atlantic and places an upper limit on the contribution of North African dust to Th-232 and Fe in the Gulf of Mexico, which is about 30% of the total input. The study also suggests that shelf sources in the Gulf of Mexico, including rivers, submarine groundwater discharge, and benthic sedimentary releases, may be as important as or even more important than dust in the budget of lithogenic metals. Additionally, the estimated Fe input in the Gulf of Mexico implies a residence time of less than 6 months, similar to that in the North Atlantic.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Oceanography
Veronica Ruiz Xomchuk, Robert D. Hetland, Lixin Qu
Summary: The occurrence of seasonal bottom hypoxia in the Northern Gulf of Mexico has been extensively studied, but little is known about internal variability and short-term shifts. This research uses a hydrodynamic model with oxygen parametrization to demonstrate the influence of physical processes with spatial and temporal scales on hypoxia development in the far-field of the Mississippi plume. Variability in advection is found to increase with decreasing temporal and spatial scales, introducing small-scale, strong anomalies in the field. Through a budget decomposition and Reynolds decomposition, the study identifies vertical flux anomalies as the primary counterbalance to sediment oxygen demand during periods of maintaining or destroying hypoxic extent.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Environmental Sciences
Guangpeng Liu, Annalisa Bracco, Daoxun Sun
Summary: This study investigates the three-dimensional transport and pathway structure of river runoff offshore the continental shelf in the Gulf of Mexico. The results show that the southward offshore transport of river runoff is driven by the largest mesoscale circulations in the basin, and is active in both summer and winter. The study also finds that submesoscale motions slightly enhance the spread of freshwater plumes in summer but have negligible or negative contribution in winter. The differences in freshwater distribution and transport volume among simulations are small.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Eric R. Hoffmayer, Jennifer A. McKinney, James S. Franks, Jill M. Hendon, William B. Driggers, Brett J. Falterman, Benjamin Galuardi, Michael E. Byrne
Summary: Whale sharks in the northern Gulf of Mexico primarily inhabit continental shelf and shelf-edge waters, while spending some time in continental slope and open ocean waters. During cooler months, there is a southward movement corresponding with reduced sighting reports. Some sharks migrate to the southwest Gulf of Mexico in fall and winter, suggesting it may be an important overwintering habitat and possibly another seasonal aggregation site.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Sumi Thapa, Timothy Magee, Edith Zagona
Summary: This study identifies key factors that affect the flexibility of hydropower systems, including physical factors, operational factors, and power markets. The results show the effects of each factor on flexibility.
Article
Ecology
T. Reid Nelson, Crystal L. Hightower, Jeff Coogan, Benjamin D. Walther, Sean P. Powers
Summary: This study provides insights into the patterns of occupancy of Red Drum in oligohaline waters and their growth consequences. Oligohaline residency varied during the second and third years of life, with a positive relationship to river discharge. Life history diversity was present in the population, and oligohaline waters played an important role as nursery habitat for juvenile Red Drum.
ENVIRONMENTAL BIOLOGY OF FISHES
(2021)
Article
Environmental Sciences
Philine S. E. zu Ermgassen, Bryan DeAngelis, Jonathan R. Gair, Sophus zu Ermgassen, Ronald Baker, Andre Daniels, Timothy C. MacDonald, Kara Meckley, Sean Powers, Marta Ribera, Lawrence P. Rozas, Jonathan H. Grabowski
Summary: Seagrasses, salt marsh edges, and oyster reefs contribute to the enhancement of fish and invertebrate production, with varying levels of effectiveness. The difference in production enhancement between habitats is attributed to factors such as species-specific densities and commercial value. The quantification of production enhancement within specific embayments can guide habitat management decisions and emphasize the importance of habitat protection and restoration.
ESTUARIES AND COASTS
(2021)
Article
Fisheries
Amanda E. Jefferson, Matthew B. Jargowsky, Meagan N. Schrandt, Pearce T. Cooper, Sean P. Powers, John J. Dindo, J. Marcus Drymon
Summary: This study assessed stock status of Atlantic Tripletail in the Gulf of Mexico by analyzing age-specific data, growth parameters, and mortality rates. Otoliths were found to be more accurate for aging, with slight differences in growth parameters between male and female Tripletail. Low levels of exploitation were indicated by estimated fishing mortality rates and natural mortality rates.
MARINE AND COASTAL FISHERIES
(2021)
Article
Fisheries
Amanda E. Jefferson, Matthew B. Jargowsky, Genevieve M. Ivec, Pearce T. Cooper, Jessica L. Carroll, Carissa L. Gervasi, Jennifer S. Rehage, John F. Mareska, Sean P. Powers, J. Marcus Drymon
Summary: The study aimed to generate baseline population dynamics parameters for Gulf of Mexico crevalle jack and examine the foraging habits of Mississippi and Alabama crevalle jack. The overall growth of crevalle jack was best represented by the logistic growth model, while sex-specific growth was best represented by a version of the von Bertalanffy growth function. Fishes were found to be more important than invertebrates in crevalle jack diet, and the diet varied among locations and years.
FISHERIES MANAGEMENT AND ECOLOGY
(2022)
Article
Fisheries
Kelly S. Boyle, Crystal L. Hightower, T. Reid P. Nelson, Sean Powers
Summary: Estimating fishing effort is crucial for effective fisheries management. In this study, passive acoustic monitoring (PAM) was used to infer fishing effort at artificial reef sites in the Gulf of Mexico. By automatically detecting sounds indicative of fishing vessels, the method proved to be effective in monitoring daily and long-term patterns of fishing activity.
FISHERIES RESEARCH
(2022)
Article
Fisheries
Crystal L. Hightower, J. Marcus Drymon, Amanda E. Jefferson, Matthew B. Jargowsky, Emily A. Seubert, Simon Dedman, John F. Mareska, Sean P. Powers
Summary: The red drum is a popular sportfish in the Gulf of Mexico, but its management in federal waters is currently data-limited. This study aimed to address data gaps highlighted in the federal stock assessment by providing updated growth models, indices of relative abundance, habitat suitability predictions, and estimates of natural mortality. The investigation revealed that adult red drum were more abundant in state waters than in federal waters, indicating that the catch moratorium in federal waters is not fully protecting the adult spawning stock of red drum in the Gulf of Mexico.
Article
Ecology
Jonathan H. Grabowski, Christopher J. Baillie, Adam Baukus, Rachael Carlyle, F. Joel Fodrie, Rachel K. Gittman, A. Randall Hughes, David L. Kimbro, Juhyung Lee, Hunter S. Lenihan, Sean P. Powers, Kevin Sullivan
Summary: Coastal marine habitats are being degraded and in response there has been large-scale restoration efforts. This study examines the recovery of oyster reefs and their role in supporting fish and invertebrate communities. The results show that restored reefs can support similar faunal communities to natural reefs, with higher densities of prey species. The findings also highlight the importance of considering landscape setting in restoration decision making to enhance the recovery of ecosystem goods and services.
Article
Oceanography
Steven L. Dykstra, Brian Dzwonkowski, Raymond Torres
Summary: This study investigates the effects of variable river discharge on tide-river interactions in a low-energy tidal environment. The results show that river events amplify tides in seaward regions and attenuate tides in landward regions, creating a region of river-induced peak amplitude seaward of the flood limit. River discharge has a greater impact on tidal currents than water levels, leading to a dynamic phase lag. The longitudinal shifts of river impacts on tides can be estimated analytically using the ratio of river discharge to tidal discharge and the geometric convergence of the system.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Fisheries
Kelly S. Boyle, Crystal L. Hightower, Sean P. Powers
Summary: Management of recreational fishing for greater amberjack in the Gulf of Mexico involves regulations and the use of descender devices to mitigate postrelease mortality. Our study found that depth and the use of descender devices did not have a significant impact on mortality risk and survivorship, while fish length was the most important factor affecting postrelease mortality.
Article
Oceanography
B. Dzwonkowski, S. Fournier, G. Lockridge, J. Coogan, Z. Liu, K. Park
Summary: This study identified spatial variations in sea surface temperatures across the inner core of Hurricane Sally (2020) using a combination of in situ and satellite data, with implications for storm intensity and rapid intensification processes.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Kelly S. Boyle, Crystal L. Hightower, T. Reid Nelson, Sean P. Powers
Summary: Passive acoustic monitoring (PAM) can reveal spatial and temporal variation of fish sounds in marine habitats, providing insights into species composition, abundance, and behavioral patterns. In the Alabama Artificial Reef Zone (AARZ), PAM was used to describe fish sounds on different reef structures, revealing variations in sound detection rates and species richness. The study highlights the importance of underwater soundscapes for reef management, as they can serve as acoustic cues for fish locating reefs.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Fisheries
Sean P. Powers, J. Marcus Drymon, Crystal L. Hightower, Liese M. Carleton, John M. Hoenig
Summary: We estimated the absolute abundance of red lionfish, gray triggerfish, and red snapper across an extensive network of artificial reefs using camera counts, indices of relative abundance, calibration factors, and index-removal estimators. From 2012 to 2017, per reef estimates increased for all three species, and network-wide absolute abundances were calculated by multiplying the average per reef estimate by the estimated number of reefs in the network. Our methodology demonstrates the value of fisheries-independent surveys in estimating absolute abundance and evaluating stock assessments.
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2023)
Article
Ecology
Kelly S. S. Boyle, Crystal L. L. Hightower, Sean P. P. Powers
Summary: Greater amberjack are active swimmers and their depth use and swimming activity are influenced by factors such as fishing-related stress and cyclonic storms. In this study, we found that fish displayed varied diel depth patterns and swimming activity, with some occupying a narrow depth range, others spending time at mid-water and near bottom, and others showing more generalized patterns. Depth use was influenced by site depth and field effort, while swimming patterns were mainly affected by field effort. Fishing stress was found to increase swimming activity, but release with a descender did not prevent altered diel patterns. The presence of cyclonic storms also impacted depth use and swimming activity. Overall, our study highlights the importance of understanding the factors influencing the behavior of greater amberjack.
ENVIRONMENTAL BIOLOGY OF FISHES
(2023)
Article
Ecology
Sean P. P. Powers, Henry Roman, Jessica Meixner, Damrongsak Wirasaet, Steven Brus, Gail Fricano, Joannes Westerink
Summary: This study examines the impact of the Deepwater Horizon oil spill on oysters in the Gulf of Mexico and finds that local populations contribute a significant proportion of oyster larvae settlement, with strong connectivity between adjacent basins but weak connectivity between nonadjacent basins. Therefore, restoration efforts should focus on building connectivity within and among basins.
Article
Oceanography
Uchenna Nwankwo, Stephan Howden, Dmitri Nechaev, Brian Dzwonkowski
Summary: Sea level studies are lacking in the Mississippi Bight compared to other coastal waters in the USA. This study focused on subinertial sea level anomalies in the Mississippi Bight shelf and found that the geostrophic balance is the dominant factor influencing these anomalies. Using radar surface currents data and various analytical methods, the researchers were able to estimate and validate the subinertial sea level anomalies, with reasonable accuracy, by considering the geostrophic balance. The study also highlighted the importance of deploying Global Navigation Satellite System buoys for accurate absolute sea level estimation.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)