Degradation and proliferation of zooxanthellae in planulae of the hermatypic coral Stylophora pistillata |
| |
Authors: | E A Titlyanov T V Titlyanova Y Loya K Yamazato |
| |
Institution: | (1) Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok, 690041, Russia, RU;(2) Department of Zoology, Tel-Aviv University, Tel-Aviv, 69978, Israel, IL;(3) Department of Biology and Tropical Biosphere Research Centre, University of the Ryukyus, Nishihara-cho, Okinawa 903-01, Japan, JP |
| |
Abstract: | Zooxanthellae in different stages of two opposite processes, degradation and proliferation, were found in the planulae of
hermatypic corals. The formation of new zooxanthellae is balanced by degraded zooxanthellae in newly released planulae. The
number of dividing zooxanthellae and degraded zooxanthellae during the day amounted to approximately 2 to 3% of the standing
stock. In settled planulae and particularly in motionless planulae of Stylophora pistillata (Esper, 1797), the degraded zooxanthellae outnumbered proliferous zooxanthellae. The proliferation and degradation of zooxanthellae
and the extrusion of degraded remnants of zooxanthellae are significantly phased. Swimming planulae are more autotrophic than
motionless planulae. The physiological parameters of settled planulae with exoskeleton are similar to those of adult polyps.
The significance of zooxanthella degradation in the vital functions of planulae is discussed. We suggest that the degradation
of zooxanthellae in planulae occurs by the digestion of symbionts by host cells.
Received: 5 March 1997 / Accepted: 6 August 1997 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|