Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota
Many explanations for Eocene climate change focus on the Southern Ocean—where tectonics influenced oceanic gateways, ocean circulation reduced heat transport, and greenhouse gas declines prompted glaciation. To date, few studies focus on marine vertebrates at high latitudes to discern paleoecologica...
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American Geophysical Union
2020
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Online Access: | https://authors.library.caltech.edu/106495/ https://authors.library.caltech.edu/106495/6/2020PA003997.pdf https://authors.library.caltech.edu/106495/9/palo20942-sup-0001-2020pa003997-si.docx https://authors.library.caltech.edu/106495/10/palo20942-sup-0002-2020pa003997data_set_si-1.csv https://resolver.caltech.edu/CaltechAUTHORS:20201106-125108320 |
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ftcaltechauth:oai:authors.library.caltech.edu:106495 2023-05-15T16:02:30+02:00 Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota Kim, Sora L. Zeichner, Sarah S. Colman, Albert S. Scher, Howie D. Kriwet, Jürgen Mörs, Thomas Huber, Matthew 2020-12 application/pdf application/msword application/vnd.ms-excel https://authors.library.caltech.edu/106495/ https://authors.library.caltech.edu/106495/6/2020PA003997.pdf https://authors.library.caltech.edu/106495/9/palo20942-sup-0001-2020pa003997-si.docx https://authors.library.caltech.edu/106495/10/palo20942-sup-0002-2020pa003997data_set_si-1.csv https://resolver.caltech.edu/CaltechAUTHORS:20201106-125108320 unknown American Geophysical Union https://authors.library.caltech.edu/106495/6/2020PA003997.pdf https://authors.library.caltech.edu/106495/9/palo20942-sup-0001-2020pa003997-si.docx https://authors.library.caltech.edu/106495/10/palo20942-sup-0002-2020pa003997data_set_si-1.csv Kim, Sora L. and Zeichner, Sarah S. and Colman, Albert S. and Scher, Howie D. and Kriwet, Jürgen and Mörs, Thomas and Huber, Matthew (2020) Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota. Paleoceanography and Paleoclimatology, 35 (12). Art. No. e2020PA003997. ISSN 2572-4517. https://resolver.caltech.edu/CaltechAUTHORS:20201106-125108320 <https://resolver.caltech.edu/CaltechAUTHORS:20201106-125108320> Article PeerReviewed 2020 ftcaltechauth 2020-12-10T18:05:51Z Many explanations for Eocene climate change focus on the Southern Ocean—where tectonics influenced oceanic gateways, ocean circulation reduced heat transport, and greenhouse gas declines prompted glaciation. To date, few studies focus on marine vertebrates at high latitudes to discern paleoecological and paleoenvironmental impacts of this climate transition. The Tertiary Eocene La Meseta (TELM) Formation has a rich fossil assemblage to characterize these impacts; Striatolamia macrota, an extinct (†) sand tiger shark, is abundant throughout the La Meseta Formation. Body size is often tracked to characterize and integrate across multiple ecological dimensions. †S. macrota body size distributions indicate limited changes during TELMs 2–5 based on anterior tooth crown height (n = 450, mean = 19.6 ± 6.4 mm). Similarly, environmental conditions remained stable through this period based on δ¹⁸O_(PO4) values from tooth enameloid (n = 42; 21.5 ± 1.6‰), which corresponds to a mean temperature of 22.0 ± 4.0°C. Our preliminary ε_(Nd) (n = 4) results indicate an early Drake Passage opening with Pacific inputs during TELM 2–3 (45–43 Ma) based on single unit variation with an overall radiogenic trend. Two possible hypotheses to explain these observations are (1) †S. macrota modified its migration behavior to ameliorate environmental changes related to the Drake Passage opening, or (2) the local climate change was small and gateway opening had little impact. While we cannot rule out an ecological explanation, a comparison with climate model results suggests that increased CO₂ produces warm conditions that also parsimoniously explain the observations. Article in Journal/Newspaper Drake Passage Southern Ocean Caltech Authors (California Institute of Technology) Drake Passage Pacific Southern Ocean |
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Caltech Authors (California Institute of Technology) |
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Many explanations for Eocene climate change focus on the Southern Ocean—where tectonics influenced oceanic gateways, ocean circulation reduced heat transport, and greenhouse gas declines prompted glaciation. To date, few studies focus on marine vertebrates at high latitudes to discern paleoecological and paleoenvironmental impacts of this climate transition. The Tertiary Eocene La Meseta (TELM) Formation has a rich fossil assemblage to characterize these impacts; Striatolamia macrota, an extinct (†) sand tiger shark, is abundant throughout the La Meseta Formation. Body size is often tracked to characterize and integrate across multiple ecological dimensions. †S. macrota body size distributions indicate limited changes during TELMs 2–5 based on anterior tooth crown height (n = 450, mean = 19.6 ± 6.4 mm). Similarly, environmental conditions remained stable through this period based on δ¹⁸O_(PO4) values from tooth enameloid (n = 42; 21.5 ± 1.6‰), which corresponds to a mean temperature of 22.0 ± 4.0°C. Our preliminary ε_(Nd) (n = 4) results indicate an early Drake Passage opening with Pacific inputs during TELM 2–3 (45–43 Ma) based on single unit variation with an overall radiogenic trend. Two possible hypotheses to explain these observations are (1) †S. macrota modified its migration behavior to ameliorate environmental changes related to the Drake Passage opening, or (2) the local climate change was small and gateway opening had little impact. While we cannot rule out an ecological explanation, a comparison with climate model results suggests that increased CO₂ produces warm conditions that also parsimoniously explain the observations. |
format |
Article in Journal/Newspaper |
author |
Kim, Sora L. Zeichner, Sarah S. Colman, Albert S. Scher, Howie D. Kriwet, Jürgen Mörs, Thomas Huber, Matthew |
spellingShingle |
Kim, Sora L. Zeichner, Sarah S. Colman, Albert S. Scher, Howie D. Kriwet, Jürgen Mörs, Thomas Huber, Matthew Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota |
author_facet |
Kim, Sora L. Zeichner, Sarah S. Colman, Albert S. Scher, Howie D. Kriwet, Jürgen Mörs, Thomas Huber, Matthew |
author_sort |
Kim, Sora L. |
title |
Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota |
title_short |
Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota |
title_full |
Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota |
title_fullStr |
Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota |
title_full_unstemmed |
Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota |
title_sort |
probing the ecology and climate of the eocene southern ocean with sand tiger sharks striatolamia macrota |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
https://authors.library.caltech.edu/106495/ https://authors.library.caltech.edu/106495/6/2020PA003997.pdf https://authors.library.caltech.edu/106495/9/palo20942-sup-0001-2020pa003997-si.docx https://authors.library.caltech.edu/106495/10/palo20942-sup-0002-2020pa003997data_set_si-1.csv https://resolver.caltech.edu/CaltechAUTHORS:20201106-125108320 |
geographic |
Drake Passage Pacific Southern Ocean |
geographic_facet |
Drake Passage Pacific Southern Ocean |
genre |
Drake Passage Southern Ocean |
genre_facet |
Drake Passage Southern Ocean |
op_relation |
https://authors.library.caltech.edu/106495/6/2020PA003997.pdf https://authors.library.caltech.edu/106495/9/palo20942-sup-0001-2020pa003997-si.docx https://authors.library.caltech.edu/106495/10/palo20942-sup-0002-2020pa003997data_set_si-1.csv Kim, Sora L. and Zeichner, Sarah S. and Colman, Albert S. and Scher, Howie D. and Kriwet, Jürgen and Mörs, Thomas and Huber, Matthew (2020) Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota. Paleoceanography and Paleoclimatology, 35 (12). Art. No. e2020PA003997. ISSN 2572-4517. https://resolver.caltech.edu/CaltechAUTHORS:20201106-125108320 <https://resolver.caltech.edu/CaltechAUTHORS:20201106-125108320> |
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1766398153842491392 |