Marine Biology

, Volume 101, Issue 2, pp 205–209 | Cite as

X-ray diffraction study of the first larval shell of Ostrea edulis

  • D. Medakovié
  • M. Hrs-Brenko
  • S. Popovié
  • B. Gržeta


X-ray powder diffraction was used to study the calcification of the first larval shell of Ostrea edulis (sampled in Limski kanal, Istria, Adriatic Sea in April 1986) from the trochophore stage to the veliger larvae (prodissoconch I), and development of the latter up to several days postfertilization (prodissoconch II). In the first stage, only the amorphous component is present (periostracum and organic matrix). The beginning of shell formation is manifested by the appearance of calcite (up to 1–4% of the total vol.) and then aragonite (2 to 7%). In a later stage of the veliger larvae the fraction of calcite decreases, as well as the fraction of the amorphous component, while the fraction of aragonite rapidly increases. In the prodissoconch II stage, aragonite is dominant, with a very small amount of amorphous component and traces of calcite. In contrast, the valves of the adult O. edulis are composed mainly of calcite, with traces of aragonite.


Calcite Powder Diffraction Diffraction Study Aragonite Organic Matrix 
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Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • D. Medakovié
    • 1
  • M. Hrs-Brenko
    • 1
  • S. Popovié
    • 2
    • 3
  • B. Gržeta
    • 2
  1. 1.Center for Marine ResearchRuđer Boškovié InstituteRovinjCroatia, Yugoslavia
  2. 2.Materials Science and Electronics DepartmentRuđer Bošković InstituteZagrebCroatia, Yugoslavia
  3. 3.Faculty of Science, Department of PhysicsUniversity of ZagrebZagrebCroatia, Yugoslavia

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