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  • Journal of the Marine Biological Association of the United Kingdom, Volume 46, Issue 1
  • February 1966, pp. 191-214

Persistent, vertical-migration rhythms in benthic microflora.: II. Field and Laboratory Studies On Diatoms From The Banks Of The River Avon

  • F. E. Round (a1) and J. D. Palmer (a2)
  • DOI:
  • Published online: 01 May 2009

The vertical migration of two Euglena species and several diatom species into and out of the sediment on the banks of the River Avon has been studied under natural conditions. All species have been shown to migrate vertically upwards when exposed during daylight. Tidal flooding of the sediment is generally preceded by re-burrowing of the algae beneath the surface. Methods have been devised to follow these migrations in both the field and laboratory. Laboratory experiments show that these migrations are rhythmic, continuing under constant illumination and temperature and removed from tidal influence. The effect of three different temperatures and three different light intensities has been investigated. Transfer from low to high temperatures has been shown to reset the phase of the rhythm. The results are discussed in relation to other work and to the ‘biological clock’ hypothesis.

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R. Bracher , 1929. The ecology of the Avon banks at Bristol. J. Ecol., Vol. 17, pp. 3581.

R. Bracher , 1937. The light relation of Euglena limosa Gard. I. The influence of intensity and quality of the light on phototaxy. J. Linn. Soc. (Bot.), Vol. 51, pp. 2342.

V. G. Bruce & C. S. Pittendrigh , 1956. Temperature indpendence in a unicellular ‘clock’. Proc. natn. Acad. Sci. U.S.A., Vol. 42, pp. 676–82.

E. Faure-Fremiet , 1951. The tidal rhythm of the diatom Hantzschia amphioxys. Biol. Bull. mar. biol. Lab., Woods Hole, Vol. 100, pp. 173–7.

M. Gard , 1922. Recherches sur une nouvelle espèce d'Euglène (Euglena limosa nov. sp.). Bull. Soc. bot. Fr., T. 69, pp. 184–96.

B. E. F. Reiman & J. C. Lewin , 1964. The diatom genus Cylindrotheca Rabenhorst. Jl R. microsc. Soc, Vol. 83, pp. 283–96.

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