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Marine Biology

, Volume 142, Issue 2, pp 305–309 | Cite as

Evidence of two-clock control of endogenous rhythm in the Washington clam, Saxidomus purpuratus

  • Wan-Soo Kim
  • Hyung-Tack Huh
  • Jong-Geel Je
  • Kyung-Nam Han

Abstract.

The oxygen consumption rates of sublittoral-dwelling Washington clams, Saxidomus purpuratus (Bivalvia: Veneridae), were determined using an automatic intermittent-flow-respirometer under constant darkness and temperature. Freshly collected clams displayed a bimodal rhythm for the first 7–9 days, and a unimodal rhythm after holding in constant conditions (CC). Therefore, clams collected from the sublittoral zone likely exhibit responses that correspond to the tides in their original environment for several days, and then shift to an endogenous unimodal (circadian) rhythm when kept under CC. This study may suggest that Washington clams possess two independent clocks that can change the rhythm of endogenous oxygen consumption from bimodal to unimodal under CC.

Keywords

Oxygen Oxygen Consumption Bivalvia Consumption Rate Oxygen Consumption Rate 
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 2003

Authors and Affiliations

  • Wan-Soo Kim
    • 1
  • Hyung-Tack Huh
    • 1
  • Jong-Geel Je
    • 1
  • Kyung-Nam Han
    • 2
  1. 1.Marine Environment & Climate Change Laboratory, Korea Ocean Research & Development Institute, Ansan, PO Box 29, Seoul 425-600, Korea
  2. 2.Department of Oceanography, Inha University, Inchon, 402-751, Korea

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