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Articles 1 - 17 of 17
Full-Text Articles in Life Sciences
Integrated Modeling Of Dynamic Marsh Feedbacks And Evolution Under Sea-Level Rise In A Mesotidal Estuary (Plum Island, Ma, Usa), Karim Alizad, James T. Morris, Matthew V. Bilskie, Davina L. Passeri, Scott C. Hagen
Integrated Modeling Of Dynamic Marsh Feedbacks And Evolution Under Sea-Level Rise In A Mesotidal Estuary (Plum Island, Ma, Usa), Karim Alizad, James T. Morris, Matthew V. Bilskie, Davina L. Passeri, Scott C. Hagen
Faculty Publications
Around the world, wetland vulnerability to sea-level rise (SLR) depends on different factors including tidal regimes, topography, creeks and estuary geometry, sediment availability, vegetation type, etc. The Plum Island estuary (PIE) is a mesotidal wetland system on the east coast of the United States. This research applied a newly updated Hydro-MEM (integrated hydrodynamic-marsh) model to assess the impacts of intermediate-low (50 cm), intermediate (1 m), and intermediate-high (1.5 m) SLR on marsh evolution by the year 2100. Model advancements include capturing vegetation change, inorganic and below and aboveground organic matter portion of marsh platform accretion, and mudflat creation. Although the …
Hydrodynamic Assessment Of Natural And Nature-Based Features For Escatawpa River And Grand Bay In The Northern Gulf Of Mexico, Peter Bacopoulos, Karim Alizad, Davina Passeri, Matthew Bilskie, Stephen Medeiros, Scott Hagen
Hydrodynamic Assessment Of Natural And Nature-Based Features For Escatawpa River And Grand Bay In The Northern Gulf Of Mexico, Peter Bacopoulos, Karim Alizad, Davina Passeri, Matthew Bilskie, Stephen Medeiros, Scott Hagen
Faculty Publications
This presentation showcases a hydrodynamic assessment of natural and nature-based features (NNBFs) for the Pascagoula River, the Escatawpa River and Grand Bay, located along the Mississippi coast of the northern Gulf of Mexico. Two separate NNBF projects are being considered to: (1) restore the historical footprint (ca. 1848) of Grand Batture Island for coastal protection purposes; and (2) reconnect the hydraulics between the Escatawpa River and Grand Bay for ecosystem services purposes. The intended coastal protection benefits of the first project include buffering agency to wave attack and attenuation of storm surge with the restored island. The intended ecosystem services …
Protocols For Assessing Transformation Rates Of Nitrous Oxide In The Water Column, Annie Bourbonnais, Claudia Frey, Xin Sun, Laura A. Bristow, Amal Jayakumar, Nathaniel E. Ostrom, Karen L. Casciotti, Bess B. Ward
Protocols For Assessing Transformation Rates Of Nitrous Oxide In The Water Column, Annie Bourbonnais, Claudia Frey, Xin Sun, Laura A. Bristow, Amal Jayakumar, Nathaniel E. Ostrom, Karen L. Casciotti, Bess B. Ward
Faculty Publications
Nitrous oxide (N2O) is a potent greenhouse gas and an ozone destroying substance. Yet, clear step-by-step protocols to measure N2O transformation rates in freshwater and marine environments are still lacking, challenging inter-comparability efforts. Here we present detailed protocols currently used by leading experts in the field to measure water-column N2O production and consumption rates in both marine and other aquatic environments. We present example 15N-tracer incubation experiments in marine environments as well as templates to calculate both N2O production and consumption rates. We discuss important considerations and recommendations regarding (1) precautions to prevent oxygen (O2) contamination during low-oxygen and anoxic …
Model Sensitivity To Topographic Uncertainty In Meso- And Microtidal Marshes, Karim Alizad, Stephen C. Medeiros, Madeline R. Foster-Martinez, Scott C. Hagen
Model Sensitivity To Topographic Uncertainty In Meso- And Microtidal Marshes, Karim Alizad, Stephen C. Medeiros, Madeline R. Foster-Martinez, Scott C. Hagen
Faculty Publications
Light detection and ranging (Lidar) derived digital elevation models are widely used in modeling coastal marsh systems. However, the topographic error in these models can affect simulations of marsh coverage and characteristics. We investigated the relevance and impact of this error in micro- and mesotidal systems. Lidar-derived and RTK-adjusted topography were each used in a dynamic marsh model, and the resulting marsh coverages were examined. For two microtidal sites (Apalachicola, FL, USA, and Grand Bay, MS, USA) using solely lidar-derived topography, the model produced Cohen Kappa values of 0.1 for both estuaries when compared with National Wetland Inventory data indicating …
Dynamic Responses And Implications To Coastal Wetlands And The Surrounding Regions Under Sea Level Rise, Karim Alizad, Scott C. Hagen, Stephen C. Medeiros, Matthew V. Bilskie, James T. Morris, Len Balthis, Christine A. Buckel
Dynamic Responses And Implications To Coastal Wetlands And The Surrounding Regions Under Sea Level Rise, Karim Alizad, Scott C. Hagen, Stephen C. Medeiros, Matthew V. Bilskie, James T. Morris, Len Balthis, Christine A. Buckel
Faculty Publications
Two distinct microtidal estuarine systems were assessed to advance the understanding of the coastal dynamics of sea level rise in salt marshes. A coupled hydrodynamic-marsh model (Hydro-MEM) was applied to both a marine-dominated (Grand Bay, Mississippi) and a mixed fluvial/marine (Weeks Bay, Alabama) system to compute marsh productivity, marsh migration, and potential tidal inundation from the year 2000 to 2100 under four sea level rise scenarios. Characteristics of the estuaries such as geometry, sediment availability, and topography, were compared to understand their role in the dynamic response to sea level rise. The results show that the low sea level rise …
Coastal Wetland Response To Sea-Level Rise In A Fluvial Estuarine System, Karim Alizad, Scott C. Hagen, James T. Morris, Stephen C. Medeiros, Matthew V. Bilskie, John F. Weishampel
Coastal Wetland Response To Sea-Level Rise In A Fluvial Estuarine System, Karim Alizad, Scott C. Hagen, James T. Morris, Stephen C. Medeiros, Matthew V. Bilskie, John F. Weishampel
Faculty Publications
Coastal wetlands are likely to lose productivity under increasing rates of sea-level rise (SLR). This study assessed a fluvial estuarine salt marsh system using the Hydro-MEM model under four SLR scenarios. The Hydro-MEM model was developed to apply the dynamics of SLR as well as capture the effects associated with the rate of SLR in the simulation. Additionally, the model uses constants derived from a 2-year bioassay in the Apalachicola marsh system. In order to increase accuracy, the lidar-based marsh platform topography was adjusted using Real Time Kinematic survey data. A river inflow boundary condition was also imposed to simulate …
Coastal Wetland Response To Sea-Level Rise In A Fluvial Estuarine System, Karim Alizad, Scott C. Hagen, James T. Morris, Stephen C. Medeiros, Matthew V. Bilskie, John F. Weishampel
Coastal Wetland Response To Sea-Level Rise In A Fluvial Estuarine System, Karim Alizad, Scott C. Hagen, James T. Morris, Stephen C. Medeiros, Matthew V. Bilskie, John F. Weishampel
Faculty Publications
Coastal wetlands are likely to lose productivity under increasing rates of sea-level rise (SLR). This study assessed a fluvial estuarine salt marsh system using the Hydro-MEM model under four SLR scenarios. The Hydro-MEM model was developed to apply the dynamics of SLR as well as capture the effects associated with the rate of SLR in the simulation. Additionally, the model uses constants derived from a 2-year bioassay in the Apalachicola marsh system. In order to increase accuracy, the lidar-based marsh platform topography was adjusted using Real Time Kinematic survey data. A river inflow boundary condition was also imposed to simulate …
Dynamic Simulation And Numerical Analysis Of Hurricane Storm Surge Under Sea Level Rise With Geomorphologic Changes Along The Northern Gulf Of Mexico, Matthew V. Bilskie, S. C. Hagen, Karim Alizad, S. C. Medeiros, D. L. Passeri, H. F. Needham, A. Cox
Dynamic Simulation And Numerical Analysis Of Hurricane Storm Surge Under Sea Level Rise With Geomorphologic Changes Along The Northern Gulf Of Mexico, Matthew V. Bilskie, S. C. Hagen, Karim Alizad, S. C. Medeiros, D. L. Passeri, H. F. Needham, A. Cox
Faculty Publications
This work outlines a dynamic modeling framework to examine the effects of global climate change, and sea level rise (SLR) in particular, on tropical cyclone-driven storm surge inundation. The methodology, applied across the northern Gulf of Mexico, adapts a present day large-domain, high resolution, tide, wind-wave, and hurricane storm surge model to characterize the potential outlook of the coastal landscape under four SLR scenarios for the year 2100. The modifications include shoreline and barrier island morphology, marsh migration, and land use land cover change. Hydrodynamics of 10 historic hurricanes were simulated through each of the five model configurations (present day …
The Response Of Runoff And Sediment Loading In The Apalachicola River, Florida To Climate And Land Use Land Cover Change, Paige A. Hovenga, Dingbao Wang, Stephen C. Medeiros, Scott C. Hagen, Karim Alizad
The Response Of Runoff And Sediment Loading In The Apalachicola River, Florida To Climate And Land Use Land Cover Change, Paige A. Hovenga, Dingbao Wang, Stephen C. Medeiros, Scott C. Hagen, Karim Alizad
Faculty Publications
The response of runoff and sediment loading in the Apalachicola River under projected climate change scenarios and land use land cover (LULC) change is evaluated. A hydrologic model using the Soil and Water Assessment Tool was developed for the Apalachicola region to simulate daily runoff and sediment load under present (circa 2000) and future conditions (2100) to understand how parameters respond over a seasonal time frame to changes in climate, LULC, and coupled climate/LULC. The Long Ashton Research Station-Weather Generator was used to downscale temperature and precipitation from three general circulation models, each under Intergovernmental Panel on Climate Change (IPCC) …
Tidal Hydrodynamics Under Future Sea Level Rise And Coastal Morphology In The Northern Gulf Of Mexico, Davina L. Passeri, Scott C. Hagen, Nathaniel G. Plant, Matthew V. Bilskie, Stephen C. Medeiros, Karim Alizad
Tidal Hydrodynamics Under Future Sea Level Rise And Coastal Morphology In The Northern Gulf Of Mexico, Davina L. Passeri, Scott C. Hagen, Nathaniel G. Plant, Matthew V. Bilskie, Stephen C. Medeiros, Karim Alizad
Faculty Publications
This study examines the integrated influence of sea level rise (SLR) and future morphology on tidal hydrodynamics along the Northern Gulf of Mexico (NGOM) coast including seven embayments and three ecologically and economically significant estuaries. A large-domain hydrodynamic model was used to simulate astronomic tides for present and future conditions (circa 2050 and 2100). Future conditions were simulated by imposing four SLR scenarios to alter hydrodynamic boundary conditions and updating shoreline position and dune heights using a probabilistic model that is coupled to SLR. Under the highest SLR scenario, tidal amplitudes within the bays increased as much as 67% (10.0 …
The Dynamic Effects Of Sea Level Rise On Low‐Gradient Coastal Landscapes: A Review, Davina L. Passeri, Scott C. Hagen, Stephen C. Medeiros, Matthew V. Bilskie, Karim Alizad
The Dynamic Effects Of Sea Level Rise On Low‐Gradient Coastal Landscapes: A Review, Davina L. Passeri, Scott C. Hagen, Stephen C. Medeiros, Matthew V. Bilskie, Karim Alizad
Faculty Publications
Coastal responses to sea level rise (SLR) include inundation of wetlands, increased shore-line erosion, and increased flooding during storm events. Hydrodynamic parameters such as tidal ranges, tidal prisms, tidal asymmetries, increased flooding depths and inundation extents during storm events respond non additively to SLR. Coastal morphology continually adapts toward equilibrium as sea levels rise, inducing changes in the landscape. Marshes may struggle to keep pace with SLR and rely on sediment accumulation and the availability of suitable uplands for migration. Whether hydrodynamic, morphologic, or ecologic, the impacts of SLR are interrelated. To plan for changes under future sea lev-els, coastal …
The Dynamic Effects Of Sea Level Rise On Low-Gradient Coastal Landscapes: A Review, Davina L. Passeri, Scott C. Hagen, Stephen C. Medeiros, Matthew V. Bilskie, Karim Alizad
The Dynamic Effects Of Sea Level Rise On Low-Gradient Coastal Landscapes: A Review, Davina L. Passeri, Scott C. Hagen, Stephen C. Medeiros, Matthew V. Bilskie, Karim Alizad
Faculty Publications
Coastal responses to sea level rise (SLR) include inundation of wetlands, increased shoreline erosion, and increased flooding during storm events. Hydrodynamic parameters such as tidal ranges, tidal prisms, tidal asymmetries, increased flooding depths and inundation extents during storm events respond nonadditively to SLR. Coastal morphology continually adapts toward equilibrium as sea levels rise, inducing changes in the landscape. Marshes may struggle to keep pace with SLR and rely on sediment accumulation and the availability of suitable uplands for migration. Whether hydrodynamic, morphologic, or ecologic, the impacts of SLR are interrelated. To plan for changes under future sea levels, coastal managers …
The Role Of Individual Behavior Type In Mediating Indirect Interactions, Blaine D. Griffen, Benjamin J. Toscano, John Gatto
The Role Of Individual Behavior Type In Mediating Indirect Interactions, Blaine D. Griffen, Benjamin J. Toscano, John Gatto
Faculty Publications
Trait-mediated indirect interactions (TMII) play an important role in structuring natural communities, and numerous studies have experimentally demonstrated their presence in a variety of systems. However, these studies have largely examined the presence or absence of traits that are responsible for these interactions, without considering natural variation between individuals in the extent to which these traits are manifested. We used a well-documented TMII to investigate the importance of individual behavior type for determining the strength of the TMII. The toadfish Opsanus tau has an indirect positive influence on bivalve survival because the mud crab Panopeus herbstii, a consumer of bivalves, …
An Unbiased Approach To Identify Genes Involved In Development In A Turtle With Temperature-Dependent Sex Determination, Jena L. Chojnowski, Edward L. Braun
An Unbiased Approach To Identify Genes Involved In Development In A Turtle With Temperature-Dependent Sex Determination, Jena L. Chojnowski, Edward L. Braun
Faculty Publications
Many reptiles exhibit temperature-dependent sex determination (TSD). The initial cue in TSD is incubation temperature, unlike genotypic sex determination (GSD) where it is determined by the presence of specific alleles (or genetic loci). We used patterns of gene expression to identify candidates for genes with a role in TSD and other developmental processes without making a priori assumptions about the identity of these genes (ortholog-based approach). We identified genes with sexually dimorphic mRNA accumulation during the temperature sensitive period of development in the Red-eared slider turtle (Trachemys scripta), a turtle with TSD. Genes with differential mRNA accumulation in response to …
A Physiochemically Constrained Seawater Culturing System For Production Of Benthic Foraminifera, Christopher J. Hintz, G. Thomas Chandler, Jay M. Bernhardt, Daniel C. Mccorkle, Suzanne M. Havach, Jessica K. Blanks, Timothy J. Shaw
A Physiochemically Constrained Seawater Culturing System For Production Of Benthic Foraminifera, Christopher J. Hintz, G. Thomas Chandler, Jay M. Bernhardt, Daniel C. Mccorkle, Suzanne M. Havach, Jessica K. Blanks, Timothy J. Shaw
Faculty Publications
No abstract provided.
Abundance Of Amino Sugars And Peptidoglycan In Marine Particulate And Dissolved Organic Matter, Ronald Benner, Karl Kaiser
Abundance Of Amino Sugars And Peptidoglycan In Marine Particulate And Dissolved Organic Matter, Ronald Benner, Karl Kaiser
Faculty Publications
No abstract provided.
234Th And 210Pb Evidence For Rapid Ingestion Of Settling Particles By Mobile Epibenthic Megafauna In The Abyssal Ne Pacific, L. M. L. Lauerman, J. M. Smoak, Timothy J. Shaw, W. S. Moore, K. L. Smith Jr.
234Th And 210Pb Evidence For Rapid Ingestion Of Settling Particles By Mobile Epibenthic Megafauna In The Abyssal Ne Pacific, L. M. L. Lauerman, J. M. Smoak, Timothy J. Shaw, W. S. Moore, K. L. Smith Jr.
Faculty Publications
No abstract provided.