Long-term history of chemosynthetic molluscan assemblages at Gulf of Mexico hydrocarbons seep sites /
234, were sampled by piston core, in order to determine the
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| Format: | Thesis eBook |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1995.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | 234, were sampled by piston core, in order to determine the are resilient over geologically long time spans, and that assemblages was due to either poor preservation of the bivalves and tubeworms found in high densities. The dominant Calyptogena ponderosa, harbor sulfur-oxidizing symbionts. Chemosynthetic assemblages were not very common in the chemosynthetic fauna of the Gulf of Mexico hydrocarbon seeps composition, paleoproduction, paleoingestion, tier and guild contained in the cores. Downcore distributions of species cores. Individual seep sites are able to support large death assemblages in the sediments. Shell material found in Deep-sea chemosynthetic communities living on the Gulf of developed in order to reconstruct the original population disturbances will not have a geologically long-term effect on followed by recolonization of the site by the same species for lucinids. Species composition and tier and guild fragment, by using readily measured parameters, such as shell from a set of fragments. The program was designed to give insight into each seep sites' long-term history. human life spans. hydrocarbon seepage were discovered less than ten years ago. length, width, weight, and thickness, in the reconstruction. long-term history of these assemblages from their preserved lucinid clams. The mussels, Bathymodiolus sp., contain lucinid fragments found in the piston cores. The method of Lucinids were only dominant in the single GB-386 core. methanotrophic symbionts, whereas, the clams, Thyasira Mexico continental slope off Louisiana in areas of minimize the amount of time necessary to analyze each Mussels were the dominant species in the four GC-234 cores, observed in the cores, but replacement of a chemosynthetic of 500 to 1,000 years was less common. Local extinction of several thousand years. Replacement of one chemosynthetic oleophila, Lucinoma sp., L. atlantis, Vesicomya cordata, and optimality varied between near optimal and sub-optimal for paleoproduction (biomass) and paleoingestion (calories) period of several hundred years, chemosynthetic fauna are populations of a single chemosynthetic species over a period Powell and Stanton (1985) was used to estimate the amount of precluded juveniles from settling at these sites. Habitat present 21.6% of the time. The absence of chemosynthetic previously living populations, or environmental conditions program was then applied to the mussel, thyasirid, and relatively persistent at a seep site. Persistence on a scale sedimentary record. Overall, the assemblages were only Seep assemblages from three sites, GB-386, GB-425, and GC- seep assemblages, although they may have on time scales of shell size and shape to the dominant chemosynthetic species, shell size were reconstructed with reasonable accuracy. The species by a non-chemosynthetic species was common. Over a species by a significant population of another was not species include mytilid mussels and thyasirid, vesicomyid and structure rarely changed significantly over the length of the structure, and size-frequency distributions were analyzed to the cores was highly fragmented. A computer program was the mussels and thyasirids, whereas it was always sub-optimal These communities are dominated by large, chemosynthetic To test the program, four species of bivalves, with similar was commonly observed on this scale. This suggests that the were chosen. Overall, numerical abundance and individual while thyasirids were dominant in the two GB-425 cores. |
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| Item Description: | "Major subject: Oceanography". Vita. |
| Physical Description: | xvi, 168 leaves : illustrations, maps ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |