升温对丛生盔形珊瑚两种形态型代谢和共生藻光合生理的影响

文章研究了温度升高对一种造礁石珊瑚——丛生盔形珊瑚(Galaxea fascicularis)的两种形态型(H和S型)代谢和共生藻光合生理的影响。研究显示H型和S型对升温的生理响应差异明显: 在虫黄藻水平上, H型丢失了大量的虫黄藻, 减轻了共生体呼吸代谢的负荷; S型中虫黄藻数目尚可维持共生体呼吸代谢的需求, 同时提高叶绿素b含量增强光的吸收。在宿主水平上, H型充分利用虫黄藻输送的营养物质, 并通过异养摄食补偿能量消耗; S型宿主所储存的营养物质可以协助共生体适应热环境。结果表明, 丛生盔形珊瑚两种形态型通过不同的能量利用方式适应环境的变化, H型倾向于维持共生体的代谢平衡, 而S型倾向于提高共生藻的能量分配。

Effects of warming on the metabolism and photosynthetic physiology of the symbiotic algae of two morphological types of Galaxea fascicularis

The effects of warming on the metabolism and photosynthetic physiology of symibiodiniaceae of two morphological types (H and S) of a reef-building coral, Galaxea fascicularis, were studied. The results showed that the physiological responses of H-type and S-type to warming were clearly different. At the symibiodiniaceae level, H-type lost a large number of symibiodiniaceae, and reduced the burden of respiratory metabolism of symbionts. In S-type, the number of zooxanthellae could still maintain the needs of symbionts for respiratory metabolism, while increasing the content of chlorophyll b to enhance light absorption. At the host level, the H-type made full use of nutrients delivered by zooxanthellae and compensated for energy consumption through heterotrophic feeding. The nutrients stored by the S-type host could assist the symbionts to adapt to the thermal environment. Galaxea fascicularis adapted itself to environmental changes through different energy utilization modes, i.e., H-type tended to maintain the metabolic balance of the symbiont, while S-type intended to improve the energy distribution of symbiotic algae.