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Chauvin, LA, United States

Kolker A.S.,Louisiana Universities Marine Consortium | Allison M.A.,University of Texas at Austin | Hameed S.,State University of New York at Stony Brook
Geophysical Research Letters | Year: 2011

While subsidence is widely recognized as a driver of geomorphic change in the northern Gulf of Mexico (GOM), there is considerable disagreement over the rates of subsidence and the interpreted variability in these rates, which leads to controversies over the impacts of subsidence on surface land area change. Here we present a new method to calculate subsidence rates from the tide gauge record that is based on an understanding of the meteorological drivers of inter-annual sea-level change. In Grand Isle, LA and Galveston, TX, we explicitly show that temporal patterns of subsidence are closely linked to subsurface fluid withdrawal and coastal land loss, and suggest changes in withdrawal rates can both increase and decrease rates of subsidence and wetland loss. Our results also imply that the volume of sediment needed to rebuild GOM wetlands may currently fall within the low end of some restoration scenarios. © 2011 by the American Geophysical Union. Source

Sammarco P.W.,Louisiana Universities Marine Consortium | Strychar K.B.,Grand Valley State University
PLoS ONE | Year: 2013

Increases in Sea Surface Temperatures (SSTs) as a result of global warming have caused reef-building scleractinian corals to bleach worldwide, a result of the loss of obligate endosymbiotic zooxanthellae. Since the 1980's, bleaching severity and frequency has increased, in some cases causing mass mortality of corals. Earlier experiments have demonstrated that zooxanthellae in scleractinian corals from three families from the Great Barrier Reef, Australia (Faviidae, Poritidae, and Acroporidae) are more sensitive to heat stress than their hosts, exhibiting differential symptoms of programmed cell death - apoptosis and necrosis. Most zooxanthellar phylotypes are dying during expulsion upon release from the host. The host corals appear to be adapted or exapted to the heat increases. We attempt to determine whether this adaptation/exaptation occurs in octocorals by examining the heat-sensitivities of zooxanthellae and their host octocoral alcyonacean soft corals - Sarcophyton ehrenbergi (Alcyoniidae), Sinularia lochmodes (Alcyoniidae), and Xenia elongata (Xeniidae), species from two different families. The soft coral holobionts were subjected to experimental seawater temperatures of 28, 30, 32, 34, and 36°C for 48 hrs. Host and zooxanthellar cells were examined for viability, apoptosis, and necrosis (in hospite and expelled) using transmission electron microscopy (TEM), fluorescent microscopy (FM), and flow cytometry (FC). As experimental temperatures increased, zooxanthellae generally exhibited apoptotic and necrotic symptoms at lower temperatures than host cells and were expelled. Responses varied species-specifically. Soft coral hosts were adapted/exapted to higher seawater temperatures than their zooxanthellae. As with the scleractinians, the zooxanthellae appear to be the limiting factor for survival of the holobiont in the groups tested, in this region. These limits have now been shown to operate in six species within five families and two orders of the Cnidaria in the western Pacific. We hypothesize that this relationship may have taxonomic implications for other obligate zooxanthellate cnidarians subject to bleaching. © 2013 Sammarco, Strychar. Source

Rabalais N.N.,Louisiana Universities Marine Consortium
Oceanography | Year: 2011

The Roger Revelle Commemorative Lecture Series was created by the Ocean Studies Board of the National Academies in honor of Dr. Roger Revelle to highlight the important links between ocean sciences and public policy. Nancy Rabalais, the twelfth annual lecturer, spoke on March 29, 2011, at the Baird Auditorium, Smithsonian Institution, National Museum of Natural History. © 2011 by The Oceanography Society. All rights reserved. Source

Agency: NSF | Branch: Cooperative Agreement | Program: | Phase: SHIP OPERATIONS | Award Amount: 473.18K | Year: 2012

This award (OCE-1219704) will support two NSF funded sea-going programs by providing access to research vessel Pelican, operated by Louisiana Universities Marine Consortium (LUMCON). R/V Pelican as a designated UNOLS vessel adheres to all UNOLS safety standards, NSF inspections, and reporting requirements. Historically LUMCON has run an efficient and economical operation to support sea-going activities primarily in the Gulf of Mexico. This award represents the start of a new five-year cooperative agreement, and for each year of the cooperative agreement annual funding will be re-negotiated based upon the number of days at sea in direct support of NSF peer-reviewed research. This award is for platform support for NSF programs.

Agency: NSF | Branch: Standard Grant | Program: | Phase: OCEANOGRAPHIC INSTRUMENTATION | Award Amount: 80.69K | Year: 2016

A request is made to fund additional and back-up instrumentation for the R/V Pelican, a 116 foot Coastal vessel operated by the Louisiana Universities Marine Consortium (LUMCON) as part of the University-National Oceanographic Laboratory System (UNOLS) research fleet. The vessel is owned by the LUMCON and the mission of the ship is to support funded oceanographic research in the Gulf of Mexico. With this proposal, LUMCON provides technical descriptions and rationale for the acquisition of the following Oceanographic Instrumentation:

Knudsen Chirp 3260 Dual Channel Echosounder $80,690

Broader Impacts
The principal impact of the present proposal is under Merit Review Criterion 2 of the Proposal Guidelines (NSF 13-589). It provides infrastructure support for scientists to use the vessel and its shared-use instrumentation in support of their NSF-funded oceanographic research projects (which individually undergo separate review by the relevant research program of NSF). The acquisition, maintenance and operation of shared-use instrumentation allows NSF-funded researchers from any US university or lab access to working, calibrated instruments for their research, reducing the cost of that research, and expanding the base of potential researchers.

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