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Ocean Engineering and Marine Sciences Faculty Publications

2017

Articles 1 - 7 of 7

Full-Text Articles in Oceanography and Atmospheric Sciences and Meteorology

Redox-Mediated Quorum Sensing In Plants, Alexandra W. Fuller, Phoebe Young, B. Daniel Pierce, Jamie Kitson-Finuff, Purvi Jain, Karl Schneider, Stephen Lazar, Olga Teran, Andrew G. Palmer, David G. Lynn Sep 2017

Redox-Mediated Quorum Sensing In Plants, Alexandra W. Fuller, Phoebe Young, B. Daniel Pierce, Jamie Kitson-Finuff, Purvi Jain, Karl Schneider, Stephen Lazar, Olga Teran, Andrew G. Palmer, David G. Lynn

Ocean Engineering and Marine Sciences Faculty Publications

The rhizosphere, the narrow zone of soil around plant roots, is a complex network of interactions between plants, bacteria, and a variety of other organisms. The absolute dependence on host-derived signals, or xenognosins, to regulate critical developmental checkpoints for host commitment in the obligate parasitic plants provides a window into the rhizosphere's chemical dynamics. These sessile intruders use H2O2 in a process known as semagenesis to chemically modify the mature root surfaces of proximal host plants and generate p-benzoquinones (BQs). The resulting redox-active signaling network regulates the spatial and temporal commitments necessary for host attachment. Recent evidence from non-parasites, including …

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Timing And Locations Of Reef Fish Spawning Off The Southeastern United States, Nicholas A. Farmer, William D. Heyman, Mandy Kamauskas, Shinichi Kobara, Tracey I. Smart, Joseph C. Ballenger, Marcel J. M. Reichert, David M. Wyanski, Michelle S. Tishler, Kenyon C. Lindeman, Susan K. Lowerre-Barbieri, Theodore S. Switzer, Justin J. Solomon, Kyle Mccain, Mark Marhefka, George R. Sedberry Mar 2017

Timing And Locations Of Reef Fish Spawning Off The Southeastern United States, Nicholas A. Farmer, William D. Heyman, Mandy Kamauskas, Shinichi Kobara, Tracey I. Smart, Joseph C. Ballenger, Marcel J. M. Reichert, David M. Wyanski, Michelle S. Tishler, Kenyon C. Lindeman, Susan K. Lowerre-Barbieri, Theodore S. Switzer, Justin J. Solomon, Kyle Mccain, Mark Marhefka, George R. Sedberry

Ocean Engineering and Marine Sciences Faculty Publications

Managed reef fish in the Atlantic Ocean of the southeastern United States (SEUS) support a multi-billion dollar industry. There is a broad interest in locating and protecting spawning fish from harvest, to enhance productivity and reduce the potential for overfishing. We assessed spatiotemporal cues for spawning for six species from four reef fish families, using data on individual spawning condition collected by over three decades of regional fishery-independent reef fish surveys, combined with a series of predictors derived from bathymetric features. We quantified the size of spawning areas used by reef fish across many years and identified several multispecies spawning …

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Coral Disease Hotspots In The Caribbean, Robert Van Woesik, Carly J. Randall Jan 2017

Coral Disease Hotspots In The Caribbean, Robert Van Woesik, Carly J. Randall

Ocean Engineering and Marine Sciences Faculty Publications

Recent outbreaks of coral diseases in the Caribbean have been linked to increasingly stressful sea-surface temperatures (SSTs). Yet, ocean warming is spatially heterogeneous and therefore has the potential to lead to hotspots of disease activity. Here, we take an epidemiological approach to examine spatial differences in the risk of white-band disease on Acropora spp. and yellow-band disease on Orbicella spp. in the Caribbean. Our analysis involved examining the spatial patterns of disease prevalence, and creating a Bayesian-risk model that tested for regional differences in disease risk. The spatial examination of disease prevalence showed several clusters of white-band disease, including high …

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Bumper V1.0: A Bayesian User-Friendly Model For Palaeo-Environmental Reconstruction, Philip B. Holden, H. John B. Birks, Stephen J. Brooks, Mark B. Bush, Grace M. Hwang, Frazer Matthews-Bird, Bryan G. Valencia, Robert Van Woeslk Jan 2017

Bumper V1.0: A Bayesian User-Friendly Model For Palaeo-Environmental Reconstruction, Philip B. Holden, H. John B. Birks, Stephen J. Brooks, Mark B. Bush, Grace M. Hwang, Frazer Matthews-Bird, Bryan G. Valencia, Robert Van Woeslk

Ocean Engineering and Marine Sciences Faculty Publications

We describe the Bayesian user-friendly model for palaeo-environmental reconstruction (BUMPER), a Bayesian transfer function for inferring past climate and other environmental variables from microfossil assemblages. BUMPER is fully self-calibrating, straightforward to apply, and computationally fast, requiring ~2 s to build a 100- taxon model from a 100-site training set on a standard personal computer. We apply the model’s probabilistic framework to generate thousands of artificial training sets under ideal assumptions. We then use these to demonstrate the sensitivity of reconstructions to the characteristics of the training set, considering assemblage richness, taxon tolerances, and the number of training sites. We find …

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Numerical Investigations Of Tip Clearance Flow Characteristics Of A Pumpjet Propulsor, Lin Lu, Yuefei Gao, Qiang Li, Lin Du Jan 2017

Numerical Investigations Of Tip Clearance Flow Characteristics Of A Pumpjet Propulsor, Lin Lu, Yuefei Gao, Qiang Li, Lin Du

Ocean Engineering and Marine Sciences Faculty Publications

In this study, numerical investigations of the tip clearance flow characteristics of a pumpjet propulsor based on Computational Fluid Dynamics (CFD) method have been presented. The Zwart-Gerber-Belamri (Z-G-B) cavitation model based on Reynolds Averaged NaviereStokes (RANS) method is employed. The structured gird is applied. The formation and development of the tip clearance flows has been investigated and presented. The structure of the tip leakage vortex has been shown. The radial distributions of different velocity components with different Span along the axial direction have been carried out to present the influence of the tip clearance flow on the main flow. In …

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Hyperspectral Signatures And Worldview-3 Imagery Of Indian River Lagoon And Banana River Estuarine Water And Bottom Types, Charles R. Bostater Jr., Taylor S. Oney, Tyler Rotkiske, Samin Aziz, Charles Morrisette, Kelby Callahan, Devin Mcallister Jan 2017

Hyperspectral Signatures And Worldview-3 Imagery Of Indian River Lagoon And Banana River Estuarine Water And Bottom Types, Charles R. Bostater Jr., Taylor S. Oney, Tyler Rotkiske, Samin Aziz, Charles Morrisette, Kelby Callahan, Devin Mcallister

Ocean Engineering and Marine Sciences Faculty Publications

Hyperspectral signatures and imagery collected during the spring and summer of 2017 and 2016 are presented. Ground sampling distances (GSD) and pixel sizes were sampled from just over a meter to less than 4.0 mm. A pushbroom hyperspectral imager was used to calculate bidirectional reflectance factor (BRF) signatures. Hyperspectral signatures of different water types and bottom habitats such as submerged seagrasses, drift algae and algal bloom waters were scanned using a high spectral and digital resolution solid state spectrograph. WorldView-3 satellite imagery with minimal water wave sun glint effects was used to demonstrate the ability to detect bottom features using …

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Collection And Corrections Of Oblique Multiangle Hyperspectral Bidirectional Reflectance Imagery Of The Water Surface, Charles R. Bostater Jr., Taylor S. Oney Jan 2017

Collection And Corrections Of Oblique Multiangle Hyperspectral Bidirectional Reflectance Imagery Of The Water Surface, Charles R. Bostater Jr., Taylor S. Oney

Ocean Engineering and Marine Sciences Faculty Publications

Hyperspectral images of coastal waters in urbanized regions were collected from fixed platform locations. Surf zone imagery, images of shallow bays, lagoons and coastal waters are processed to produce bidirectional reflectance factor (BRF) signatures corrected for changing viewing angles. Angular changes as a function of pixel location within a scene are used to estimate changes in pixel size and ground sampling areas. Diffuse calibration targets collected simultaneously from within the image scene provides the necessary information for calculating BRF signatures of the water surface and shorelines. Automated scanning using a pushbroom hyperspectral sensor allows imagery to be collected on the …

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