Sclerite formation in the hydrothermal-vent "scaly-foot" gastropod - Possible control of iron sulfide biomineralization by the animal

Yohey Suzuki, Robert E. Kopp, Toshihiro Kogure, Akinobu Suga, Ken Takai, Shinji Tsuchida, Noriaki Ozaki, Kazuyoshi Endo, Jun Hashimoto, Yasuhiro Kato, Chitoshi Mizota, Takafumi Hirata, Hitoshi Chiba, Kenneth H. Nealson, Koki Horikoshi, Joseph L. Kirschvink

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Abstract

A gastropod from a deep-sea hydrothermal field at the Rodriguez triple junction, Indian Ocean, has scale-shaped structures, called sclerites, mineralized with iron sulfides on its foot. No other organisms are known to produce a skeleton consisting of iron sulfides. To investigate whether iron sulfide mineralization is mediated by the gastropod for the function of the sclerites, we performed a detailed physical and chemical characterization. Nanostructural characterization of the iron sulfide sclerites reveals that the iron sulfide minerals pyrite (FeS2) and greigite (Fe3S4) form with unique crystal habits inside and outside of the organic matrix, respectively. The magnetic properties of the sclerites, which are mostly consistent with those predicted from their nanostructual features, are not optimized for magnetoreception and instead support use of the magnetic minerals as structural elements. The mechanical performance of the sclerites is superior to that of other biominerals used in the vent environment for predation as well as protection from predation. These characteristics, as well as the co-occurrence of brachyuran crabs, support the inference that the mineralization of iron sulfides might be controlled by the gastropod to harden the sclerites for protection from predators. Sulfur and iron isotopic analyses indicate that sulfur and iron in the sclerites originate from hydrothermal fluids rather than from bacterial metabolites, and that iron supply is unlikely to be regulated by the gastropod for iron sulfide mineralization. We propose that the gastropod may control iron sulfide mineralization by modulating the internal concentrations of reduced sulfur compounds.

Original languageEnglish
Pages (from-to)39-50
Number of pages12
JournalEarth and Planetary Science Letters
Volume242
Issue number1-2
DOIs
Publication statusPublished - Feb 15 2006

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Keywords

  • Biomineralization
  • Hydrothermal-vent gastropod
  • Iron sulfides
  • Sclerite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Suzuki, Y., Kopp, R. E., Kogure, T., Suga, A., Takai, K., Tsuchida, S., Ozaki, N., Endo, K., Hashimoto, J., Kato, Y., Mizota, C., Hirata, T., Chiba, H., Nealson, K. H., Horikoshi, K., & Kirschvink, J. L. (2006). Sclerite formation in the hydrothermal-vent "scaly-foot" gastropod - Possible control of iron sulfide biomineralization by the animal. Earth and Planetary Science Letters, 242(1-2), 39-50. https://doi.org/10.1016/j.epsl.2005.11.029