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Preferential expulsion of dividing algal cells as a mechanism for regulating algal-cnidarian Symbiosis
Baghdasarian, G.; Muscatine, L. (2000). Preferential expulsion of dividing algal cells as a mechanism for regulating algal-cnidarian Symbiosis. Biol. Bull. 199: 278-286
In: Biological Bulletin. Marine Biological Laboratory: Lancaster. ISSN 0006-3185, more
Peer reviewed article  

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  • Baghdasarian, G.
  • Muscatine, L.

    A wide range of both intrinsic and environmental factors can influence the population dynamics of algae in symbiosis with marine cnidarians. The present study shows that loss of algae by expulsion from cnidarian hosts is one of the primary regulators of symbiont population density. Because there is a significant linear correlation between the rate of algal expulsion and the rate of algal division, factors that increase division rates (e.g., elevated temperature) also increase expulsion rates. Additionally, 3 H-thymidine is taken up to a greater extent by algae destined to be expelled than by algae retained in the host cnidarians. Taken together, data for rates of expulsion, rates of division at different temperatures, and uptake of 3 H-thymidine suggest that dividing algal cells are preferentially expelled from their hosts. The preferential expulsion of dividing cells may be a mechanism for regulation of algal population density, where the rate of expulsion of algae may be an inverse function of the ability of host cells to accommodate new algal daughter cells. This kind of regulation is present in some cnidarian species (e.g., Aiptasia pulchella, Pocillo-pora damicornis), but not in all (e.g., Montipora verrucosa, Porites compressa, and Fungia scutaria).

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