Calcification in Hermatypic and Ahermatypic Corals
Calcification in Hermatypic and Ahermatypic Corals
复制标题
异型和非异型珊瑚的钙化
作者：
Alan T. Marshall
目前，热带珊瑚礁的进化发展归因于珊瑚与共生藻类(虫黄藻)的结合以及光对钙化的促进。与这一观点相反，没有共生藻类的非造礁热带珊瑚(Tubasrea Faulkneri)的钙化率与虫黄藻造礁珊瑚(Galaxea Fascular Aris)的光增强率相同。然而，钙化的机制在这两个物种中是不同的。在有藻类的珊瑚中，钙化不是“光增强”，而是“暗抑制”。因此，珊瑚礁的进化发展可能与珊瑚与共生藻类联合产生的光增强钙化作用无关。
The evolutionary development of tropical coral reefs is presently ascribed to the association of corals with symbiotic algae (zooxanthellae) and to the enhancement of calcification by light. Contrary to this idea, the calcification rate in a non-reef-building tropical coral (Tubastrea faulkneri) without symbiotic algae was the same as the light-enhanced rate in a zooxanthellate reef-building coral (Galaxea fascicularis). The mechanisms of calcification, however, differed between the two species. Instead of being “light-enhanced,” calcification in corals with algae was “dark-repressed.” The evolutionary development of coral reefs may therefore not be related to light-enhanced calcification resulting from the association of corals with symbiotic algae.