Radiolaria in the Holocene sediment of the Gulf of Mexico and the basins off southern California: assemblage changes with water depth and eutrophism
Radiolarian assemblages in Holocene sediments from the Gulf of Mexico and Caribbean and the southern California borderland reflect overlying oceanographic conditions, such as general productivity, upwelling, and preservational parameters. A reconnaissance investigation of the lateral variations in t...
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ftriceuniv:oai:scholarship.rice.edu:1911/104032 2023-05-15T17:53:49+02:00 Radiolaria in the Holocene sediment of the Gulf of Mexico and the basins off southern California: assemblage changes with water depth and eutrophism Wigley, Cynthia R. Casey, Richard E. Anderson, John B.;Clark, Howard C. 1982 148 pp reformatted digital application/pdf https://hdl.handle.net/1911/104032 eng eng Wigley, Cynthia R. "Radiolaria in the Holocene sediment of the Gulf of Mexico and the basins off southern California: assemblage changes with water depth and eutrophism." (1982) Master’s Thesis, Rice University. https://hdl.handle.net/1911/104032 . https://hdl.handle.net/1911/104032 RICE1658 Thesis Geol. 1982 Wigley Thesis Text 1982 ftriceuniv 2022-08-09T20:55:03Z Radiolarian assemblages in Holocene sediments from the Gulf of Mexico and Caribbean and the southern California borderland reflect overlying oceanographic conditions, such as general productivity, upwelling, and preservational parameters. A reconnaissance investigation of the lateral variations in the radiolarian assemblage with increasing water depth indicates that the changes are not consistent enough in either region for the establishment of a definite depth zonation; however a number of radiolarian species and higher taxa show some general trends with depth. Symbiotic taxa, and spumellaria in general, are more abundant in the thanatocoenosis of the Gulf region than off California and are indicative of oligotrophic conditions. Low oxygen content and high dissolved silica concentration in the bottom water of the Gulf of Mexico's Orca Basin lead to good preservation in this locality. Diversity, up to the family level, is greater in the California assemblages due to a mixing of radiolarian faunas and better preservation. There are more deep-water radiolarian taxa present at shallower depths, and all depths, in the California assemblages as compared to those of the Gulf due to more dynamic upwelling conditions which enhance these species both in the biocoenosis and thanatocoenosis. Thesis Orca Rice University: Digital Scholarship Archive |
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Rice University: Digital Scholarship Archive |
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English |
description |
Radiolarian assemblages in Holocene sediments from the Gulf of Mexico and Caribbean and the southern California borderland reflect overlying oceanographic conditions, such as general productivity, upwelling, and preservational parameters. A reconnaissance investigation of the lateral variations in the radiolarian assemblage with increasing water depth indicates that the changes are not consistent enough in either region for the establishment of a definite depth zonation; however a number of radiolarian species and higher taxa show some general trends with depth. Symbiotic taxa, and spumellaria in general, are more abundant in the thanatocoenosis of the Gulf region than off California and are indicative of oligotrophic conditions. Low oxygen content and high dissolved silica concentration in the bottom water of the Gulf of Mexico's Orca Basin lead to good preservation in this locality. Diversity, up to the family level, is greater in the California assemblages due to a mixing of radiolarian faunas and better preservation. There are more deep-water radiolarian taxa present at shallower depths, and all depths, in the California assemblages as compared to those of the Gulf due to more dynamic upwelling conditions which enhance these species both in the biocoenosis and thanatocoenosis. |
author2 |
Casey, Richard E. Anderson, John B.;Clark, Howard C. |
format |
Thesis |
author |
Wigley, Cynthia R. |
spellingShingle |
Wigley, Cynthia R. Radiolaria in the Holocene sediment of the Gulf of Mexico and the basins off southern California: assemblage changes with water depth and eutrophism |
author_facet |
Wigley, Cynthia R. |
author_sort |
Wigley, Cynthia R. |
title |
Radiolaria in the Holocene sediment of the Gulf of Mexico and the basins off southern California: assemblage changes with water depth and eutrophism |
title_short |
Radiolaria in the Holocene sediment of the Gulf of Mexico and the basins off southern California: assemblage changes with water depth and eutrophism |
title_full |
Radiolaria in the Holocene sediment of the Gulf of Mexico and the basins off southern California: assemblage changes with water depth and eutrophism |
title_fullStr |
Radiolaria in the Holocene sediment of the Gulf of Mexico and the basins off southern California: assemblage changes with water depth and eutrophism |
title_full_unstemmed |
Radiolaria in the Holocene sediment of the Gulf of Mexico and the basins off southern California: assemblage changes with water depth and eutrophism |
title_sort |
radiolaria in the holocene sediment of the gulf of mexico and the basins off southern california: assemblage changes with water depth and eutrophism |
publishDate |
1982 |
url |
https://hdl.handle.net/1911/104032 |
genre |
Orca |
genre_facet |
Orca |
op_relation |
Wigley, Cynthia R. "Radiolaria in the Holocene sediment of the Gulf of Mexico and the basins off southern California: assemblage changes with water depth and eutrophism." (1982) Master’s Thesis, Rice University. https://hdl.handle.net/1911/104032 . https://hdl.handle.net/1911/104032 RICE1658 Thesis Geol. 1982 Wigley |
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