Marine Biology Department (MARB)

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http://hdl.handle.net/1969.1/1581949

The focus of this department is biological science with an ocean or estuarine emphasis

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Dermo log 2009-2010
(2010-11-18) Culbert, Jan; Ray, Sammy M
Spreadsheet of data for dermocystidian marinum incidence in oysters on reefs along the coast of Texas.
Scenic Galveston: Swan Lake Project
Ray, Sammy M
Galveston Bay Travelog
Ray, Sammy M
Presentation for the Mitchell Aqua Culture Retreat. November 2nd-5th, 2010
Anis, Ayal; Quigg, Antonietta; Ray, Sammy M
Dermo Summary 1998-2007
(2010-12-09) Ray, Sammy M; Culbert, Jan
Spreadsheet of cumulated incidence of dermocystidan marinum disease of oysters in Texas from 1998 - 2007.
Monthly Summary of Perkinsus marinus (Dermo) Data for Texas Oysters
(2010) Ray, Sammy M
Excel spreadsheets of datasets for dermo disease prevalence in Texas oysters.
Benthic production and processes off Baja California, Northwest Africa and Peru: a classification of benthic subsystems in upwelling ecosystems
(Instituto de Investigaciones Pesqueras., 1985) Rowe, Gilbert T.
Estimates of the standing stocks, secondary production and metabolism of the benthos have been compared in the coastal upwelling ecosystems off northwest Africa, Baja California, and southern Peru. Northwest Africa is characterized by shelf break upwelling and as a result standing stocks, macrobenthic production and sediment organic matter are highest out at the shelf-slope boundary. Sediment microbial activity and biomass on the other hand are highest nearshore in the dynamic zone where aeolian silt and sand are being blown into the sea from the Sahara Desert. Baja California is dominatd by the red crab Pleuroncodes planipes, having high rates of growth and metabolic utilization of organic matter, both on bottom and in the water. Peru benthos and metabolism are very different from the above areas because of the low oxygen concentrations in the bottom water. Organic matter is far higher in the sediment and heterotrophic metabolism is principally anaerobic rather than aerobic. A normal offshore benthic fauna is replaced by a mat of sulfur bacteria with unknown production and metabolic rates. Benthic subsystems in upwelling ecosystems can be placed in two categories: those overloaded with organic matter, depleted of oxygen and dominated by sulfate reduction and those that are are not overloaded and remain aerobic. Peru and southwest Africa typify overloaded systems whereas NW Africa and Baja California are examples of aerobic systems. Although benthic metabolism and inorganic nutrient regeneration are high in both types of subsystems, all upwelling ecosystems, with their dynamic open boundaries, export organic particulate matter and import inorganic nutrients at rates that are far in excess of that consumed or produced by benthic metabolism.
40th reunion of Battle of Peleliu, Palau islands. February 1984
Ray, Sammy M
Benthic biomass in the Pisco, Peru upwelling
(1971-02) Rowe, Gilbert T.
Quantitative benthic samples were taken off Peru in and adjacent to the Pisco upwelling in an attempt to assess the effects of extremes in productivity and dissolved oxygen on the distribution of biomass (organic cabon). The macrofauna was combused to organic carbon (less the carbonate fraction) to allow direct comparisons with the production of organic carbon at the surface and its distribution in the water column and sediments. Similar techniques were employed in the Gulf of Mexico previously (Rowe and Menzel, 1970), and it is hoped comparisons of the two sets of data contrasting regions of low and high proudctivity will give some insights into the nature of the movement of organic energy from its source through the water column to the bottom.
Pressure cooking
(2011) Ray, Sammy M
Describes how to pressure cook media-filled test tubes for the analysis of Dermocystidian marinum disease in oysters.
Environmental Drivers of Habitat Use by Hawksbill Turtles (Eretmochelys imbricata) in the Arabian Gulf (Qatar)
(2020-12-01) Marshall, Christopher
Understanding the environmental drivers of movement patterns are critical to the protection, management and recovery of endangered species. The Arabian Gulf is considered to be the hottest marine system in the world and is known for its extreme environmental conditions that pose substantial physiological stress on marine organisms living there. Satellite tags were deployed on hawksbill turtles in the Arabian Gulf and quantitative ecological modeling (i.e., Bayesian state-space models and GAMMs) was used to provide new insights into the ecological basis of observed hawksbill movement and behavior. Hawksbills used a relatively large core area in the southeast Arabian Gulf when transit and area-restricted search behaviors were included. The numerous hotspots identified suggest that important habitat occurs along a large area of the Qatari eastern coastline and into Saudi Arabia. Offshore islands with fringing reef habitat and deep-water habitats near the 30-50 m isobaths were intensely used. Hawksbills made seasonal migrations to deep-water habitat during summer months, typically once SST reached ~33°C and bottom temperature reached ~32°C. These data provide valuable information to managers seeking to conserve hawksbills in the region. Our data also provide a context to understand the underlying physiological, energetic and behavioral drivers of hawksbill movement in the Arabian Gulf. Future studies should include the use of biologging devices, benthic surveys, and dietary biomarkers to better understand the seasonal migrations of Arabian Gulf hawksbills to this deep-water region.
Publications of Sammy Ray after 2001
Ray, Sammy M
List of peer- reviewed publications of Dr. Ray after 2001
Monthly Summary of Perkinsus marinus (Dermo) Data for Texas Oysters
(2008) Ray, Sammy M
Excel spreadsheets of monthly data on extent of dermo disease in Texas oysters.
Speech, Galveston Bay Foundation, Oystermen fund raiser
(2011-04-02) Ray, Sammy M
Speech on the fate of oyster production for Galveston Bay
Last to stand: Albert Collier, Sole surviving member of AIFRB
(2009-08-17) Ray, Sammy M
This is text for a presentation/tribute to Albert Collier, a founding member of the American Institute of Fisheries Research Biologists.
Selected photos "People to People" - China
Ray, Charlotte; Ray, Sammy M
44 slide presentation with views of Peking and Okinawa. March - April, 1983
DermoWatch: Monitoring the health of Galveston Bay with Oysters
Robinson, Lance; Kortright, Enrique V; Soniat, Thomas M; Ray, Sammy M
Current status of dermo disease, Perkinsus marinus, and oyster harvest in West Bay, Galveston, Texas
Ray, Sammy M
The coastal areas of Texas received above normal rainfall during 2006 and 2007. Thereby reducing the salinity in West Bay, the high salinity arm of the Galveston Bay system. This condition has resulted in reduced Dermo disease intensity in oysters and increased oyster harvest. West Bay water salinity usually varies from the high 20’s to the low 30’s ppt. In 2007 the salinity generally ranged 20 +/- 2ppt. Although the incidence of Dermo infections remained high, the intensity of (weighted incidence) was below usual levels. Preliminary results of studies regarding Dermo infections of oyster spat show that infection initiation is “proximity” dependant. Speculation is advanced regarding the observation that intertidal oyster populations appear to survive Dermo disease better than subtidal populations.
Monthly Summary of Perkinsus marinus (Dermo) Data for Texas Oysters
(2006) Ray, Sammy M
Monthly datasets for prevalence of dermo disease in Texas oysters.
Monthly Summary of Perkinsus marinus (Dermo) Data for Texas Oysters
(2009) Ray, Sammy M
Excel spreadsheets of datasets by month for prevalence of dermo disease of oysters in Texas

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