Inter-partner specificity limits the acquisition of thermotolerant symbionts in a model cnidarian-dinoflagellate symbiosis
Inter-partner specificity limits the acquisition of thermotolerant symbionts in a model cnidarian-dinoflagellate symbiosis
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DOI：
10.1038/s41396-019-0429-5
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发表时间：
2019-10-01
期刊：
影响因子：
11
通讯作者：
Davy, Simon K.
中科院分区：
文献类型：
--
作者：
Gabay, Yasmin;Parkinson, John Everett;Davy, Simon K.
珊瑚和其他刺胞动物在气候变化中生存的能力部分取决于其内共生体群落的组成。甲藻科共生藻科在遗传和生理上是多样的，刺胞动物适应温度升高的一个机制是获得更耐热的共生体。然而，刺胞藻甲藻协会的特异性程度不同，这可能会限制他们的能力，改变共生体社区。在这里，我们接种了共生体的海葵Exaiptasia苍白（通常被称为“Aiptasia”），刺胞藻甲藻共生的模型系统，同时或顺序的混合物的耐热性和热敏感的共生藻科物种的无息肉。然后，我们在两到四周的正常和高温下监测共生体的成功（相对比例丰度）。所有海葵在高温下都有漂白的迹象。在同时接种过程中，本地的，热敏感的Breviolum minutum殖民息肉最成功，无论温度配对时，对非本地的，但更耐热的共生藻microadriaticum或Durusdinium trenchii。此外，海葵最初定殖与B。minutum，随后暴露于S. microadriaticum未能获得新的共生体。这些结果突出了合作伙伴的特异性可能会对某些刺胞动物获得更耐热的共生体的能力产生很大的限制，从而限制了它们在气候变化下的适应潜力。
The ability of corals and other cnidarians to survive climate change depends partly on the composition of their endosymbiont communities. The dinoflagellate family Symbiodiniaceae is genetically and physiologically diverse, and one proposed mechanism for cnidarians to acclimate to rising temperatures is to acquire more thermally tolerant symbionts. However, cnidarian-dinoflagellate associations vary in their degree of specificity, which may limit their capacity to alter symbiont communities. Here, we inoculated symbiont-free polyps of the sea anemone Exaiptasia pallida (commonly referred to as 'Aiptasia'), a model system for the cnidarian-dinoflagellate symbiosis, with simultaneous or sequential mixtures of thermally tolerant and thermally sensitive species of Symbiodiniaceae. We then monitored symbiont success (relative proportional abundance) at normal and elevated temperatures across two to four weeks. All anemones showed signs of bleaching at high temperature. During simultaneous inoculations, the native, thermally sensitive Breviolum minutum colonized polyps most successfully regardless of temperature when paired against the non-native but more thermally tolerant Symbiodinium microadriaticum or Durusdinium trenchii. Furthermore, anemones initially colonized with B. minutum and subsequently exposed to S. microadriaticum failed to acquire the new symbiont. These results highlight how partner specificity may place strong limitations on the ability of certain cnidarians to acquire more thermally tolerant symbionts, and hence their adaptive potential under climate change.