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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ftriceuniv:oai:scholarship.rice.edu:1911/109803 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 application/pdf https://hdl.handle.net/1911/109803 https://doi.org/10.1029/2020PA003997 eng eng Wiley Kim, Sora L., Zeichner, Sarah S., Colman, Albert S., et al. "Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota." Paleoceanography and Paleoclimatology, 35, no. 12 (2020) Wiley: https://doi.org/10.1029/2020PA003997. https://hdl.handle.net/1911/109803 2020PA003997 https://doi.org/10.1029/2020PA003997 This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0/ CC-BY Journal article Text publisher version 2020 ftriceuniv https://doi.org/10.1029/2020PA003997 2022-08-09T20:29:10Z 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 δ18OPO4 values from tooth enameloid (n = 42; 21.5 ± 1.6‰), which corresponds to a mean temperature of 22.0 ± 4.0°C. Our preliminary εNd (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 Rice University: Digital Scholarship Archive Drake Passage Pacific Southern Ocean Paleoceanography and Paleoclimatology 35 12 |
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Open Polar |
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Rice University: Digital Scholarship Archive |
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ftriceuniv |
language |
English |
description |
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 δ18OPO4 values from tooth enameloid (n = 42; 21.5 ± 1.6‰), which corresponds to a mean temperature of 22.0 ± 4.0°C. Our preliminary εNd (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 |
Wiley |
publishDate |
2020 |
url |
https://hdl.handle.net/1911/109803 https://doi.org/10.1029/2020PA003997 |
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 |
Kim, Sora L., Zeichner, Sarah S., Colman, Albert S., et al. "Probing the Ecology and Climate of the Eocene Southern Ocean With Sand Tiger Sharks Striatolamia macrota." Paleoceanography and Paleoclimatology, 35, no. 12 (2020) Wiley: https://doi.org/10.1029/2020PA003997. https://hdl.handle.net/1911/109803 2020PA003997 https://doi.org/10.1029/2020PA003997 |
op_rights |
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2020PA003997 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
35 |
container_issue |
12 |
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1766398153310863360 |