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Biol Bull 100: 173-177. (June 1951)
© 1951 Marine Biological Laboratory
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THE TIDAL RHYTHM OF THE DIATOM HANTZSCHIA AMPHIOXYS

E. FAURÉ-FREMIET 1

1 Collége de France, Paris, and Marine Biological Laboratory. Woods Hole, Mass.

1. A sand-dwelling population of the diatom Hantzschia amphioxys Ehrb. is described, which exhibits a tidal rhythm that persists for sonic days when held without tide under artificial conditions in the laboratory. This rhythm is characterized by a periodic inversion of the phototropistic response, and by an agglutination of the members when ill the photophobic state.

2. A comparison of this behavior with that of Euglena limosa, Chroimulina psammobia and Strombidium oculatum shows close analogies and suggests that the same explanation may account for the synchronization of physiological rhythm and tide in all cases. It seems to be that the rising tide acts as a selective factor.

3. Organic substances produced by the diatoms contribute to the structural stabilization of the superficial sandy layer, and the presence of this organic material appears to be an ecological condition essential to the interstitial microfauna.






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Copyright © 1951 by the Marine Biological Laboratory.