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  • 1
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    Oyster Studies Along the Texas Coast, 1968 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14240 | 9596 | 2020-08-31 20:19:08 | 14240 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Oyster (Crassostrea virginica) studies showed death rates to be low in Aransas and Galveston Bays but relatively high in Matagorda Bay. Initial mortality in Matagorda Bay was associated with freshwater and siltation but subsequent summer deaths were associated with Labyrinthomyxa infection.
    Keywords: Ecology ; oysters ; Crassostrea virginica ; mortality ; oyster fisheries ; Labyrinthomyxa sp. ; fungal diseases ; stock assessment ; GBIC
    Repository Name: AquaDocs
    Type: book_section
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  • 2
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    Oyster (Crassostrea virginica) Mortality Studies Along the Texas Coast (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14249 | 9596 | 2020-08-31 20:09:09 | 14249 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Mortality rates among oysters (Crassostrea virginica) of different sizes and from different bay areas were compared in three separate studies in Galveston, Matagorda, and Aransas Bays. A general pattern of spring and late summer mortality cycles was observed in Galveston and Aransas Bays with higher mortalities occurring in late summer. An unusual fall (November) mortality period was observed in Matagorda Bay. Dermocystidium appeared to be the major cause of mortality among oyster stocks in Galveston Bay but was not responsible for the extreme mortalities in Matagorda and Aransas Bays. The presence of Aransas Bay Organisms (ABO) in these areas was suspected but not confirmed.
    Keywords: Ecology ; oysters ; Crassostrea virginica ; mortality ; Dermocystidium marinum ; fungal diseases ; GBIC
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  • 3
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    Study of the Oyster Population in the Galveston Bay Area - Survey of Oyster Populations and Associated Organisms (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14281 | 9596 | 2020-08-28 15:31:05 | 14281 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: The sample abundance of oyster (Crassostrea virginica) spat decreased in 1963 as compared to 1962, and a further decline occurred in 1964. Seed oysters also declined in sample abundance during 1963 as a result of poor survival among the 1963 (and possibly 1962) oyster spat sets. The seed stock increased slightly during the fall 1964, indicating better survival of the 1964 oyster spat set. Market oysters were abundant in the samples during 1963 but decreased considerably in 1964.
    Description: Survey of oyster populations and associated organisms
    Keywords: Biology ; Fisheries ; GBIC ; oysters ; Crassostrea virginica ; abundance ; stock assessment ; spat ; seed ; oyster fisheries ; Dermocystidium marinum ; fungal diseases ; survival ; mortality
    Repository Name: AquaDocs
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  • 4
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    Oyster Studies, 1969 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14270 | 9596 | 2020-08-31 20:15:29 | 14270 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Oyster sampling was conducted in Galveston Bay, Texas. Monitoring of 1965, 1966, and 1967 year class oysters at two tray stations indicated a relatively low annual mortality rate of under 20%. Peak death rates, associated with Labyrinthomyxa infection, occurred in late summer. Moderate oyster spat setting occurred in the mid-bay area beginning in July. Survival was good and seed stock increased. Labyrinthomyxa marina infection among market oyster stocks remained below epidemic level and more oysters were available to the fishermen. Oystering was again centered in the mid-bay area and was judged to be relatively heavy. The harvest of 173,300 barrels was 22 percent higher than that of the previous season.
    Keywords: Ecology ; Fisheries ; oysters ; oyster fisheries ; spat ; larval settlement ; mortality ; Labyrinthomyxa marina ; fungal diseases ; stock assessment ; GBIC
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  • 5
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    Summary of Oyster Studies Along the Texas Coast (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14187 | 9596 | 2020-08-31 20:28:40 | 14187 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: The intensity of 1963 oyster (Crassostrea virginica) spat set was generally less than that observed in 1962. The set appeared to be more abundant along the lower coast than on the upper coast. A decline in apparent abundance of year old seed stock was noted, beginning in late spring. Unlike 1962 little increase in the abundance of seed oysters occurred during the fall.
    Keywords: Fisheries ; Oceanography ; oysters ; Crassostrea virginica ; abundance ; spat ; mortality ; infectious diseases ; oyster fisheries ; diseases
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  • 6
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    Summary of Oyster Studies Along the Texas Coast - Survey of Oyster Populations and Associated Organisms (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14279 | 9596 | 2020-08-28 15:43:01 | 14279 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Both seed oyster Crassostrea virginica stock and market oyster stock continued to decline in Aransas, San Antonio, Matagorda, and Galveston Bays. Losses appeared to be most severe in the Aransas Bay area, diminishing up the coast to Galveston Bay. Much of the loss in the middle coast was attributed to Aransas Bay disease which affected young seed oysters as well as the older market oysters. The disease was found in 1963 in Aransas Bay and was apparently associated with the moralities in San Antonio and Lavaca Bays. During 1964 the disease spread into Copano Bay, most of San Antonio Bay, Lavaca Bay, and Matagorda Bay. The organism responsible for Aransas Bay disease was identified by Dr. J.G. Mackin as an intre-cell organism similar to that associated with Malpeque Bay disease in Canadian waters. Sever moralities in Tres Palacios Bay appeared to be caused by Dermocystidium marinum judging by the high infection incidence found in samples during the late summer. However, the catastrophic losses among seed oysters was more characteristic of Aransas Bay disease. In Galveston Bay Dermocstidium spread further up the bay than in 1963 and was assumed to be the primary cause of oyster moralities. Tray studies at two stations showed an annual mortality rate of approximately 50 percent, both in 1963 and 1964. Most of the mortality at each station was due to Dermocystidium. Oyster production, in spite of high moralities, set a new record during the 1964-65 season. Most of the harvest came from Galveston Bay where heavy fishing pressure compensated for the relatively low abundance of market oysters.
    Keywords: Biology ; Fisheries ; GBIC ; oysters ; Crassostrea virginica ; stock assessment ; seed ; mortality ; Dermocystidium marinum ; fungal diseases ; oyster fisheries
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  • 7
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    Dead Sea Basin Imaged by Ambient Seismic Noise Tomography (2012)
    In:  Pure and Applied Geophysics
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    Publication Date: 2020-02-12
    Description: In the framework of the Dead Sea Integrated Research project (DESIRE), 59 seismological stations were deployed in the region of the Dead Sea Basin. Twenty of these stations recorded data of sufficiently high quality between May and September 2007 to be used for ambient seismic noise analysis. Empirical Green’s functions are extracted from cross-correlations of long term recordings. These functions are dominated by Rayleigh waves, whose group velocities can be measured in the frequency range from 0.1 to 0.5 Hz. Analysis of positive and negative correlation lags of the Green’s functions makes it possible to identify the direction of the source of the incoming energy. Signals with frequencies higher than 0.2 Hz originate from the Mediterranean Sea, while low frequencies arrive from the direction of the Red Sea. Travel times of the extracted Rayleigh waves were measured between station pairs for different frequencies, and tomographically inverted to provide independent velocity models. Four such 2D models were computed for a set of frequencies, all corresponding to different sampling depths, and thus together giving an indication of the velocity variations in 3D extending to a depth of 10 km. The results show low velocities in the Dead Sea Basin, consistent with previous studies suggesting up to 8 km of recent sedimentary infill in the Basin. The complex structure of the western margin of the Basin is also observed, with sedimentary infill present to depths not exceeding 5 km west of the southern part of the Dead Sea. The high velocities associated with the Lisan salt diapir are also observed down to a depth of ~5 km. The reliability of the results is confirmed by checkerboard recovery tests.
    Keywords: 550 - Earth sciences
    Language: English
    Type: info:eu-repo/semantics/article
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  • 8
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    A receiver function study across the Dead Sea Basin (DSB) (2009)
    In:  69. Jahrestagung der Deutschen Geophysikalischen Gesellschaft (Kiel 2009)
    Details
    Publication Date: 2020-02-12
    Description: Beginning in September 2006, a temporary network of 30 broadband and 45 short-period seismic stations has been set up on both sides of the Dead Sea Basin (DSB). During one and a half year of successful operation, data were continuously recorded in the field at 100 Hz and 200 Hz sample frequency for the broadband and short-period seismic stations, respectively. The raw data were converted to miniseed format and archived as full seed volume in the GEOFON data center of the GFZ. In the present work, the Receiver Function Method has been applied to the three component passive source data to investigate seismic discontinuities from the crust down to the upper mantle. Unusual negative phases at about 1s delay time have been observed at several stations in the Dead Sea region on the top of the assumed salt diapir. First preliminary receiver function analysis reveals a crustal thickness of about 30 -35 km in the investigated area and possibly low-velocity layer beneath the Moho. It also shows a basin which is possibly filled with salt about 10 km thick beneath the Lisan peninsula (Dead Sea).
    Keywords: 550 - Earth sciences
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  • 9
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    Crustal structure of the Dead Sea Basin (DSB) from a receiver function analysis (2010)
    In:  EOS, Transactions, American Geophysical Union, Fall Meeting Suppl. 91
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 10
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    Crustal structure of the Dead Sea Basin (DSB) from a Receiver Function Analysis (2011)
    In:  Geophysical Journal International
    Details
    Publication Date: 2020-02-12
    Description: The Dead Sea Transform (DST) is a major left-lateral strike-slip fault that accommodates the relative motion between the African and Arabian plates, connecting a region of extension in the Red Sea to the Taurus collision zone in Turkey over a length of about 1100 km. The Dead Sea Basin (DSB) is one of the largest basins along the DST. The DSB is a morphotectonic depression along the DST, divided into a northern and a southern sub-basin, separated by the Lisan salt diapir. We report on a receiver function study of the crust within the multidisciplinary geophysical project, DEad Sea Integrated REsearch (DESIRE), to study the crustal structure of the DSB. A temporary seismic network was operated on both sides of the DSB between 2006 October and 2008 April. The aperture of the network is approximately 60 km in the E—W direction crossing the DSB on the Lisan peninsula and about 100 km in the N—S direction. Analysis of receiver functions from the DESIRE temporary network indicates that Moho depths vary between 30 and 38 km beneath the area. These Moho depth estimates are consistent with results of near-vertical incidence and wide-angle controlled-source techniques. Receiver functions reveal an additional discontinuity in the lower crust, but only in the DSB and west of it. This leads to the conclusion that the internal crustal structure east and west of the DSB is different at the present-day. However, if the 107 km left-lateral movement along the DST is taken into account, then the region beneath the DESIRE array where no lower crustal discontinuity is observed would have lain about 18 Ma ago immediately adjacent to the region under the previous DESERT array west of the DST where no lower crustal discontinuity is recognized.
    Keywords: 550 - Earth sciences
    Language: English
    Type: info:eu-repo/semantics/article
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