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Probing the ecology...
Probing the ecology and climate of the Eocene Southern Ocean with sand tiger sharks Striatolamia macrota
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- Kim, Sora (författare)
- Department of Life and Environmental Sciences, University of California, Merced, CA, USA
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- Zeichner, Sarah (författare)
- Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, USA
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- Colman, Albert (författare)
- Department of Earth, Environment, and Planetary Sciences, Rice University, Houston, TX, USA
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- Scher, Howie (författare)
- Department of Earth, Ocean, and Environment, University of South Carolina, Columbia, SC, USA
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- KRIWET, JÜRGEN (författare)
- Department of Paleontology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.
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- Mörs, Thomas, 1962- (författare)
- Naturhistoriska riksmuseet,Enheten för paleobiologi
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- Huber, Matthew (författare)
- Department of Earth, Atmosphere, and Planetary Sciences, Purdue University, West Lafayette, IN, USA
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(creator_code:org_t)
- American Geophysical Union (AGU), 2020
- 2020
- Engelska.
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Ingår i: Paleoceanography and Paleoclimatology. - : American Geophysical Union (AGU). - 2572-4517 .- 2572-4525. ; 35:12
- Relaterad länk:
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https://nrm.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- Neodymium isotope analysis
- oxygen isotope analysis
- paleobiology
- paleoclimate
- Seymour Island
- Temperature
- The changing Earth
- Den föränderliga jorden
- Ecosystems and species history
- Ekosystem och arthistoria
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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