Marine Biology

, Volume 133, Issue 1, pp 65–68 | Cite as

Occurrence of the Kumamoto oyster Crassostrea sikamea in the Ariake Sea, Japan

  • D. Hedgecock
  • G. Li
  • M. A. Banks
  • Z. Kain
Article

Abstract

The Kumamoto oyster Crassostrea sikamea is distinguished from the closely related Pacific oyster C. gigas by concordant differences in 16S rDNA, allozymes, and a one-way gametic incompatibility. After repeated failures to find this oyster in its native habitat, we speculated in 1994 that “the Kumamoto oyster may be extinct in Japan”. In September 1996, we sampled small, deep-cupped oysters from the Ariake Sea and typed these for 16S rDNA and ITS-1 DNA markers previously shown to be diagnostic for the three most common oysters in the Ariake Sea, C. gigas, C. sikamea and  C. ariakensis. Our earlier suggestion of the demise of  C. sikamea proved incorrect. Of the 256 oysters sampled, 181 (71%) were  C. gigas, 53 (21%) were C. sikamea, and 22 (9%) were  C. ariakensis; no interspecific hybrids were observed. The distributions of C. sikamea and  C. ariakensis are clumped in the Ariake Sea:  C. sikamea occurs on the eastern and northern shores,  C. ariakensis occurs only in the northern part. These results emphasize the value of molecular markers for discriminating these morphologically plastic species both in the field and in aquaculture.

Keywords

Japan Molecular Marker Native Habitat Interspecific Hybrid Pacific Oyster 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • D. Hedgecock
    • 1
  • G. Li
    • 1
  • M. A. Banks
    • 1
  • Z. Kain
    • 1
  1. 1.Bodega Marine Laboratory, The University of California at Davis, Bodega Bay, California 94923-0247, USA Fax: 001 (0)707-875-1915 e-mail: dehedgecock@ucdavis.eduUS

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