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Endogenous circatidal rhythm in the Manila clam Ruditapes philippinarum (Bivalvia: Veneridae) |
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| Authors: | W S Kim H T Huh J-H Lee H Rumohr C H Koh |
| Institution: | Biological Oceanography Division, Korea Ocean Research & Development Institute, Ansan, P.O. Box 29, Seoul 425-600, Korea, KR Institut für Meereskunde, Universit?t Kiel, Düsternbrooker Weg 20, D-24105, Kiel, Germany, DE Department of Oceanography, Seoul National University, Seoul 151-742, Korea, KR |
| Abstract: | Manila clams, Ruditapes philippinarum, removed from their natural environment and maintained for 9 weeks in continuously immersed conditions exhibited a clear endogenous circatidal rhythm in oxygen consumption. The clams exhibited a semidiurnal rhythmicity in oxygen consumption after showing a diurnal pattern in the first few days (5 to 7 d) of the experiment. The results of the present study indicate that activity rhythms of clams are controlled not only by exogenous factors, but also by an endogenous circatidal periodicity. Received: 8 April 1998 / Accepted: 1 February 1999 |
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