Rhythmical changes in the division and degradation of symbiotic algae in hermatypic corals

Rhythmical changes in the division and degradation of symbiotic algae in hermatypic corals Three types of rhythmical changes in division and degradation (digestion) have been found and described in the symbiotic zooxanthellae of the scleractinian coral Seriatopora caliendrum and in the colonial hydroid Myllepora intricata collected at the reef of Sesoko Island (Okinawa, Japan). The first type of changes reported for S. caliendrum is daily variation of the intensity of these two processes peaking at night. The second type of rhythm changes described in S. caliendrum and M. intricata is opposing variations of cell division and degradation levels with a period of three days. The rhythm is disturbed by sudden weather changes or by variations in light. Rhythmical alterations of zooxanthella proliferation and degradation of the third type found in S. caliendrum have a period of 5–6 days and are connected with oppositely directed changes as well as with alterations of the second type. The rhythm of such alterations is not disturbed by abrupt weather changes. All three types of rhythmical changes in zooxanthellae division and digestion observed in hermatypic coral are supposed to be directed to the regulation of the population density of zooxanthellae in organism tissues. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Rhythmical changes in the division and degradation of symbiotic algae in hermatypic corals

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Publisher
Springer Journals
Copyright
Copyright © 2006 by Pleiades Publishing, Inc.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074006010020
Publisher site
See Article on Publisher Site

Abstract

Three types of rhythmical changes in division and degradation (digestion) have been found and described in the symbiotic zooxanthellae of the scleractinian coral Seriatopora caliendrum and in the colonial hydroid Myllepora intricata collected at the reef of Sesoko Island (Okinawa, Japan). The first type of changes reported for S. caliendrum is daily variation of the intensity of these two processes peaking at night. The second type of rhythm changes described in S. caliendrum and M. intricata is opposing variations of cell division and degradation levels with a period of three days. The rhythm is disturbed by sudden weather changes or by variations in light. Rhythmical alterations of zooxanthella proliferation and degradation of the third type found in S. caliendrum have a period of 5–6 days and are connected with oppositely directed changes as well as with alterations of the second type. The rhythm of such alterations is not disturbed by abrupt weather changes. All three types of rhythmical changes in zooxanthellae division and digestion observed in hermatypic coral are supposed to be directed to the regulation of the population density of zooxanthellae in organism tissues.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Mar 29, 2006

References

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