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首页> 外文期刊>Coral reefs: journal of the International Society for Reef Studies >The effect of temperature stress on coral-Symbiodinium associations containing distinct symbiont types
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The effect of temperature stress on coral-Symbiodinium associations containing distinct symbiont types

机译：温度胁迫对含有不同共生体类型的珊瑚-共生生物缔合的影响

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Several studies have demonstrated that the temperature tolerance of scleractinian reef-building corals is controlled, in part, by hosting physiologically distinct symbiotic algae. We investigated the thermal tolerance of coral-algal associations within seven common species of reef-building corals hosting distinct Symbiodinium sub-clades collected from Heron Island during experimentally induced bleaching conditions. During experimental heating, photosynthetic fitness was assessed by the dark-adapted yield of PSII (F _v/F _m), and excitation pressure across PSII (Q _m) of each coral-algal association using pulse amplitude modulation fluorometry. The onset of bleaching was determined by the measurement of Symbiodinium cell density. Using the ribosomal internal transcribed spacer 2 (ITS-2) region, we showed that Symbiodinium type-coral host associations were temporally and spatially conserved in a high proportion of the colonies sampled within each species. Generally, the species Acropora millepora, Platygyra daedalea, Acropora aspera and Acropora formosa contained Symbiodinium ITS-2 type C3, whereas the species Montipora digitata, Porites cylindrica and Porites lutea contained Symbiodinium type C15. Bleaching susceptibility showed some association with Symbiodinium type, but further research is required to confirm this. Corals hosting C3 Symbiodinium displayed higher reductions in F _v/F _m during heating compared to their C15 counterparts, irrespective of host species. However, a corresponding reduction in Symbiodinium density was not observed. Nonetheless, A. aspera and A. formosa showed significant reductions in Symbiodinium density relative to controls. This correlated with large increases in Q _m and decreases in F _v/F _m in heated explants. Our results suggest a range of bleaching susceptibilities for the coral species investigated, with A. aspera and A. formosa showing the greatest susceptibility to bleaching and M. digitata showing the lowest bleaching susceptibility. The data provide strong evidence for distinct differences in temperature tolerance between C3 and C15 Symbiodinium types when in-hospite; however, future studies addressing the confounding effect of host species would help to confirm this.
机译：几项研究表明，建造巩膜珊瑚的珊瑚的温度耐受性部分受宿主生理上不同的共生藻类控制。我们调查了在实验诱导的漂白条件下，七种常见的造礁珊瑚物种的热耐受性，这些珊瑚物种具有从苍鹭岛收集的独特的共生菌亚种，这些珊瑚共有七个常见的造礁珊瑚。在实验加热期间，通过脉宽调制荧光法通过暗适应的PSII产量（F _v / F _m）和每个珊瑚-藻类缔合的PSII两端的激发压力（Q _m）评估光合适应性。通过Symbiodinium细胞密度的测定来确定漂白的开始。使用核糖体内部转录间隔区2（ITS-2）的区域，我们表明共生动物类型的珊瑚宿主协会在每个物种中采样的高比例殖民地在时间和空间上都是保守的。通常，千足虫，斜纹夜蛾，阿斯帕罗亚虫和福寿螺都含有Symbiodinium ITS-2 C3型，而指尖万寿菊，Porites cylindrica和Porites lutea则含有Symbiodinium C15型。漂白敏感性与共生素类型有关，但需要进一步研究证实这一点。与C15对应物相比，托管C3共生素的珊瑚在加热过程中显示出更高的F _v / F _m降低，而与宿主物种无关。但是，未观察到共生菌素密度的相应降低。但是，相对于对照，曲霉和福寿菌显示出Symbiodinium密度显着降低。这与加热外植体中Q _m的大幅增加和F _v / F _m的降低有关。我们的结果表明，对所调查的珊瑚种类有一系列的漂白敏感性，其中A. aspera和A. formosa对漂白的敏感性最高，而M. digitata对漂白的敏感性最低。数据为住院期间C3和C15共生菌类型之间的温度耐受性差异提供了有力的证据。但是，针对宿主物种混杂效应的未来研究将有助于证实这一点。

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