Ammonite habitat revealed via isotopic composition and comparisons with co-occurring benthic and planktonic organisms

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  • Jocelyn Anne Sessa
    Division of Paleontology, American Museum of Natural History, New York, NY 10024;
  • Ekaterina Larina
    Division of Paleontology, American Museum of Natural History, New York, NY 10024;
  • Katja Knoll
    Division of Paleontology, American Museum of Natural History, New York, NY 10024;
  • Matthew Garb
    Department of Earth and Environmental Sciences, Brooklyn College, Brooklyn, NY 11210;
  • J. Kirk Cochran
    School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794;
  • Brian T. Huber
    Department of Paleobiology, National Museum of Natural History, Washington, DC 20013;
  • Kenneth G. MacLeod
    Department of Geological Sciences, University of Missouri, Columbia, MO 65211
  • Neil H. Landman
    Division of Paleontology, American Museum of Natural History, New York, NY 10024;

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<jats:title>Significance</jats:title> <jats:p>Because ammonites are one of the most diverse, abundant, and well-preserved clades in the history of life, they are a mainstay in macroevolutionary and biodiversity studies; however, their ecologies are poorly understood, and it is unknown whether taxa lived near the sea surface or seafloor. This uncertainty undermines their use in paleoecological and paleoenvironmental reconstructions, which depend on knowledge of organisms’ depth preferences. Here, we use a rare co-occurrence of exquisitely well-preserved ammonites and planktonic and benthic organisms to constrain depth preferences of three common ammonite families by comparing the oxygen and carbon isotopic signatures of these taxa. The ammonites fall into two distinct depth habitats, enhancing the utility of these families for highly refined paleoecological and paleoclimatic studies.</jats:p>

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