Rates and pattern of evolution among Cretaceous radiolarians; relations with global paleoceanographic events
We present a new approach for analyzing the turnover rates of Cretaceous radiolarians recorded in pelagic sequences of western Tethys. The analysis of major extinction-radiation events and the fluctuation of diversity are compared with major paleoceanographic events and variation of diversity in din...
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| Veröffentlicht in: | Micropaleontology 2002, Vol.48, p.1-22 |
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| creator | O'Dogherty, Luis Guex, Jean |
| description | We present a new approach for analyzing the turnover rates of Cretaceous radiolarians recorded in pelagic sequences of western Tethys. The analysis of major extinction-radiation events and the fluctuation of diversity are compared with major paleoceanographic events and variation of diversity in dinoflagellates, calcareous nannoplankton and ammonites. There is an extraordinary correlation between biotic changes and sea level changes, temperatures, O, C and Sr isotopes, phosphorus accumulation rates and anoxic episodes. This reveals a predominantly abiotic control on the evolution of radiolarians. The rate of turnover and the diversity through time of two major orders of radiolarians (nassellarians and spumellarians) exhibits (1) the quasi-parallelism of their diversity curves, excluding a direct competition between them, (2) greater resistance of spumellarians to extinction during the early stage of extinction intervals and (3) a stronger post-extinction recovery of nassellarians. Evolutionary rates of radiolarians can be a good means of monitoring global environmental changes and allowing us to understand more clearly the relationship between plankton evolution, climate and paleoceanographic processes. |
| doi_str_mv | 10.2113/48.1.1 |
| format | Article |
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The analysis of major extinction-radiation events and the fluctuation of diversity are compared with major paleoceanographic events and variation of diversity in dinoflagellates, calcareous nannoplankton and ammonites. There is an extraordinary correlation between biotic changes and sea level changes, temperatures, O, C and Sr isotopes, phosphorus accumulation rates and anoxic episodes. This reveals a predominantly abiotic control on the evolution of radiolarians. The rate of turnover and the diversity through time of two major orders of radiolarians (nassellarians and spumellarians) exhibits (1) the quasi-parallelism of their diversity curves, excluding a direct competition between them, (2) greater resistance of spumellarians to extinction during the early stage of extinction intervals and (3) a stronger post-extinction recovery of nassellarians. 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The analysis of major extinction-radiation events and the fluctuation of diversity are compared with major paleoceanographic events and variation of diversity in dinoflagellates, calcareous nannoplankton and ammonites. There is an extraordinary correlation between biotic changes and sea level changes, temperatures, O, C and Sr isotopes, phosphorus accumulation rates and anoxic episodes. This reveals a predominantly abiotic control on the evolution of radiolarians. The rate of turnover and the diversity through time of two major orders of radiolarians (nassellarians and spumellarians) exhibits (1) the quasi-parallelism of their diversity curves, excluding a direct competition between them, (2) greater resistance of spumellarians to extinction during the early stage of extinction intervals and (3) a stronger post-extinction recovery of nassellarians. Evolutionary rates of radiolarians can be a good means of monitoring global environmental changes and allowing us to understand more clearly the relationship between plankton evolution, climate and paleoceanographic processes.</description><subject>alkaline earth metals</subject><subject>biodiversity</subject><subject>biologic evolution</subject><subject>C-13/C-12</subject><subject>carbon</subject><subject>Cretaceous</subject><subject>Evolution</subject><subject>Geology</subject><subject>Invertebrata</subject><subject>invertebrate</subject><subject>isotope ratios</subject><subject>isotopes</subject><subject>Mass extinction events</subject><subject>mass extinctions</subject><subject>Mesozoic</subject><subject>metals</subject><subject>microfossils</subject><subject>Nassellina</subject><subject>O-18/O-16</subject><subject>Oceans</subject><subject>Osculosida</subject><subject>oxygen</subject><subject>paleo-oceanography</subject><subject>Paleoclimatology</subject><subject>paleoecology</subject><subject>Paleontology</subject><subject>pelagic environment</subject><subject>planktonic taxa</subject><subject>Protista</subject><subject>Radiolaria</subject><subject>Sea level</subject><subject>Sea water</subject><subject>sea-level changes</subject><subject>Shales</subject><subject>Species extinction</subject><subject>Spumellina</subject><subject>Sr-87/Sr-86</subject><subject>stable isotopes</subject><subject>Stratigraphy</subject><subject>strontium</subject><subject>Surface water</subject><subject>Tethys</subject><issn>0026-2803</issn><issn>1937-2795</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNotj0tLAzEUhYMoWKv-AhdZuZGpN8k8UlxJ8QUFQXQ93MncmU5Jk5qkFv-9U-rqLM7HxzmMXQuYSSHUfa5nYiZO2ETMVZXJal6csgmALDOpQZ2zixjXAKDLqpgw-4GJIkfX8i2mRMFx33H68XaXBu84brzr-SJQQkN-F3nAdvAWw4AuPvBAFg9c5PshrXhvfYN2NFnyhtD5PuB2NZhRSC7FS3bWoY109Z9T9vX89Ll4zZbvL2-Lx2WGssxT1gpUSJUGgrLMhUJTEKmq6ZA61EYq1RotVNGoloyQsm2E0KgkCGoEykpN2e3Ruw3-e0cx1ZshGrIW3eFDLXShdVHBCN4cwXVMPtTbMGww_NYi1yXAfKzvjnVPPpqBnKG9D7at134X3PiglgCqhqKEcdQfaAp0mw</recordid><startdate>2002</startdate><enddate>2002</enddate><creator>O'Dogherty, Luis</creator><creator>Guex, Jean</creator><general>American Museum of Natural History</general><general>Micropaleontology Press, American Museum of Natural History</general><scope>7TN</scope><scope>F1W</scope><scope>H95</scope><scope>L.G</scope></search><sort><creationdate>2002</creationdate><title>Rates and pattern of evolution among Cretaceous radiolarians; 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relations with global paleoceanographic events</atitle><jtitle>Micropaleontology</jtitle><date>2002</date><risdate>2002</risdate><volume>48</volume><spage>1</spage><epage>22</epage><pages>1-22</pages><issn>0026-2803</issn><eissn>1937-2795</eissn><abstract>We present a new approach for analyzing the turnover rates of Cretaceous radiolarians recorded in pelagic sequences of western Tethys. The analysis of major extinction-radiation events and the fluctuation of diversity are compared with major paleoceanographic events and variation of diversity in dinoflagellates, calcareous nannoplankton and ammonites. There is an extraordinary correlation between biotic changes and sea level changes, temperatures, O, C and Sr isotopes, phosphorus accumulation rates and anoxic episodes. This reveals a predominantly abiotic control on the evolution of radiolarians. The rate of turnover and the diversity through time of two major orders of radiolarians (nassellarians and spumellarians) exhibits (1) the quasi-parallelism of their diversity curves, excluding a direct competition between them, (2) greater resistance of spumellarians to extinction during the early stage of extinction intervals and (3) a stronger post-extinction recovery of nassellarians. Evolutionary rates of radiolarians can be a good means of monitoring global environmental changes and allowing us to understand more clearly the relationship between plankton evolution, climate and paleoceanographic processes.</abstract><pub>American Museum of Natural History</pub><doi>10.2113/48.1.1</doi><tpages>22</tpages></addata></record> |
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| ispartof | Micropaleontology, 2002, Vol.48, p.1-22 |
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| source | BioOne Complete; JSTOR Archive Collection A-Z Listing |
| subjects | alkaline earth metals biodiversity biologic evolution C-13/C-12 carbon Cretaceous Evolution Geology Invertebrata invertebrate isotope ratios isotopes Mass extinction events mass extinctions Mesozoic metals microfossils Nassellina O-18/O-16 Oceans Osculosida oxygen paleo-oceanography Paleoclimatology paleoecology Paleontology pelagic environment planktonic taxa Protista Radiolaria Sea level Sea water sea-level changes Shales Species extinction Spumellina Sr-87/Sr-86 stable isotopes Stratigraphy strontium Surface water Tethys |
| title | Rates and pattern of evolution among Cretaceous radiolarians; relations with global paleoceanographic events |
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