ABSTRACT Corals exhibit different responses to increasing temperature but it remains unclear whether this is determined exclusively by symbiont type or by intrinsic properties of the host. Here, we investigated the response to elevated temperature of symbionts of the same ITS2 type from three acroporid species from Bolinao, northwestern Philippines. Maximum quantum yield (Fv/Fm) of PSII was measured in symbionts subjected to 26°C (average winter temperature) and 31°C (average summer temperature) for up to 48 hrs. Greater reduction in Fv/Fm was observed for ex hospite than for in hospite symbionts. However, no significant differences in response could be discerned for symbionts associated with or originating from the different acroporids. Thus, while these findings confirm that the coral host can protect in hospite symbionts from temperature perturbations, for the acroporids in this study, there is still no evidence that host type confers differential thermal susceptibility to the symbionts or to the coral holobiont.

中文翻译：

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住院和非住院共生菌对高温反应的比较

摘要 珊瑚对温度升高表现出不同的反应，但尚不清楚这是否完全由共生体类型或宿主的内在特性决定。在这里，我们研究了来自菲律宾西北部 Bolinao 的三种 acroporid 物种的相同 ITS2 类型的共生体对高温的响应。PSII 的最大量子产率 (Fv/Fm) 在经受 26°C（冬季平均温度）和 31°C（夏季平均温度）长达 48 小时的共生体中测量。在院外观察到的 Fv/Fm 比在院内共生体中的减少更大。然而，对于与不同的顶孔动物相关或源自不同的顶孔动物的共生体，在反应方面没有显着差异。因此，