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Oxygen Isotope Variability within Nautilus Shell Growth Bands.

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Area of Science:

  • Paleontology
  • Marine Biology
  • Geochemistry

Background:

  • Nautilus serves as a model for extinct shelled cephalopods.
  • Nautilus shells precipitate aragonite and exhibit growth banding.
  • Oxygen isotope analysis is key to understanding marine environments.

Purpose of the Study:

  • To investigate the utility of in situ oxygen isotope analysis across Nautilus shell growth bands.
  • To determine if shell isotopes record environmental changes and behavior.
  • To assess the potential for reconstructing ancient cephalopod ecology.

Main Methods:

  • Collected Nautilus shells from wild and aquarium-reared specimens.
  • Utilized secondary ion mass spectrometry (SIMS) for high-resolution in situ oxygen isotope analysis.
  • Examined oxygen isotope variations within and between shell growth bands.

Main Results:

  • Observed significant inter- and intra-band oxygen isotope (δ18O) variations in wild Nautilus.
  • Identified a δ18O range in wild Nautilus suggesting at least 400m of depth change.
  • Noted isotopic variations in aquarium-reared Nautilus likely due to water management, not migration.

Conclusions:

  • SIMS analysis of Nautilus shell growth bands reveals detailed environmental and behavioral data.
  • The shell's isotopic record indicates significant, non-sinusoidal depth migrations in Nautilus.
  • This high-resolution isotopic approach can elucidate the depth migration behavior of extinct nektonic mollusks.