The evolutionary history of size variation of planktic foraminiferal assemblages in the Cenozoic
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2004
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| _version_ | 1867167660024791040 |
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| author | Schmidt, Daniela N Thierstein, Hans R Bollmann, Jörg |
| author_facet | Schmidt, Daniela N Thierstein, Hans R Bollmann, Jörg |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The iterative evolutionary radiation of planktic foraminifers is a well-documented macroevolutionary process. Here we document the accompanying size changes in entire planktic foraminiferal assemblages for the past 70 My and their relationship to paleoenvironmental changes. After the size decrease at the Cretaceous/Paleogene (K/P) boundary, high latitude assemblages remained consistently small. Size evolution in low latitudes can be divided into three major phases: the first is characterized by dwarfs (65-42 Ma), the second shows moderate size fluctuations (42–14 Ma), and in the third phase, planktic foraminifers have grown to the unprecedented sizes observed today. Our analyses of size variability with paleoproxy records indicate that periods of size increase coincided with phases of global cooling (Eocene and Neogene). These periods were characterized by enhanced latitudinal and vertical temperature gradients in the oceans and high diversity (polytaxy). In the Paleocene and during the Oligocene, the observed (minor) size changes of the largely low-diversity (oligotaxic) assemblages seem to correlate with productivity changes. However, polytaxy per se was not responsible for larger test sizes. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_694693 |
| institution | PANGAEA |
| language | en |
| publishDate | 2004 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | The evolutionary history of size variation of planktic foraminiferal assemblages in the Cenozoic Schmidt, Daniela N Thierstein, Hans R Bollmann, Jörg 120-747A; 120-748B; 120-748C; 120-750A; 121-758A; 122-762B; 122-762C; 130-806B; 143-865B; 143-865C; 154-925A; 154-925B; 154-925E; 171-1049; 171-1050A; 171-1051A; 171-1051B; Blake Nose, North Atlantic Ocean; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg120; Leg121; Leg122; Leg130; Leg143; Leg154; Leg171B; North Atlantic Ocean; North Pacific Ocean; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean The iterative evolutionary radiation of planktic foraminifers is a well-documented macroevolutionary process. Here we document the accompanying size changes in entire planktic foraminiferal assemblages for the past 70 My and their relationship to paleoenvironmental changes. After the size decrease at the Cretaceous/Paleogene (K/P) boundary, high latitude assemblages remained consistently small. Size evolution in low latitudes can be divided into three major phases: the first is characterized by dwarfs (65-42 Ma), the second shows moderate size fluctuations (42–14 Ma), and in the third phase, planktic foraminifers have grown to the unprecedented sizes observed today. Our analyses of size variability with paleoproxy records indicate that periods of size increase coincided with phases of global cooling (Eocene and Neogene). These periods were characterized by enhanced latitudinal and vertical temperature gradients in the oceans and high diversity (polytaxy). In the Paleocene and during the Oligocene, the observed (minor) size changes of the largely low-diversity (oligotaxic) assemblages seem to correlate with productivity changes. However, polytaxy per se was not responsible for larger test sizes. |
| title | The evolutionary history of size variation of planktic foraminiferal assemblages in the Cenozoic |
| topic | 120-747A; 120-748B; 120-748C; 120-750A; 121-758A; 122-762B; 122-762C; 130-806B; 143-865B; 143-865C; 154-925A; 154-925B; 154-925E; 171-1049; 171-1050A; 171-1051A; 171-1051B; Blake Nose, North Atlantic Ocean; COMPCORE; Composite Core; DRILL; Drilling/drill rig; Indian Ocean; Joides Resolution; Leg120; Leg121; Leg122; Leg130; Leg143; Leg154; Leg171B; North Atlantic Ocean; North Pacific Ocean; Ocean Drilling Program; ODP; South Indian Ridge, South Indian Ocean |
| url | https://doi.org/10.1594/PANGAEA.694693 |