@article{TEXTUAL,
      recid = {14004},
      author = {Kim, Sora L. and Zeichner, Sarah S. and Colman, Albert S.  and Scher, Howie D. and Kriwet, Jürgen and Mörs, Thomas and  Huber, Matthew},
      title = {Probing the Ecology and Climate of the Eocene Southern  Ocean With Sand Tiger Sharks <i>Striatolamia  macrota</i>},
      journal = {Paleoceanography and Paleoclimatology},
      address = {2020-11-06},
      number = {TEXTUAL},
      abstract = {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  onδ<sup>18</sup>O<sub>PO4</sub> 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<sub>Nd</sub>  (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 CO<sub>2</sub> produces  warm conditions that also parsimoniously explain the  observations.},
      url = {http://knowledge.uchicago.edu/record/14004},
}