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Mitotic Index in Selected Red Algae In Situ I. Preliminary Survey1

Published online by Cambridge University Press:  11 May 2009

Alan P. Austin
Affiliation:
Department of Biology, University of Victoria, Victoria, British Columbia, Canada
John D. Pringle
Affiliation:
Department of Biology, University of Victoria, Victoria, British Columbia, Canada

Extract

A review of the literature indicated a lack of quantitative data on cell division in macroscopic algae in the laboratory and particularly in situ. By means of SCUBA techniques selected red algae were collected from their in situ location on a 24 h basis through the seasons of the year. The varied oceanographic and meteoro-logical conditions on the southern tip of Vancouver Island provided shore habitats of adequate contrast. Rhodomela larix was found to be a suitable test species for quantitative work, and differentials in mitotic activity in the growing parts of this plant were explored. Using squash techniques a method of quantitative estimation of mitotic activity employing a point-counting method was developed. It was found necessary to define the limits of mitotic phases in R. larix to facilitate quantitative analysis which was carried out over 24 h periods both in July and in February. Mitotic activity in R. larix showed a well-marked periodicity, although only the July data are statistically significant. The distribution of mitotic activity throughout the day was similar both in July and in February despite the dissimilarity of photo-period, temperature and tidal factors, which suggests the presence of a circadian rhythm. This preliminary work is being continued by further in situ investigations correlated with laboratory cultures under controlled environmental conditions.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1968

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