Species-specific interactions between algal endosymbionts and coral hosts define their bleaching response to heat and light stress
Species-specific interactions between algal endosymbionts and coral hosts define their bleaching response to heat and light stress
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DOI：
10.1098/rspb.2008.0180
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发表时间：
2008-10-07
影响因子：
4.7
通讯作者：
van Oppen, Madeleine J. H.
中科院分区：
文献类型：
--
作者：
Abrego, David;Ulstrup, Karin E.;van Oppen, Madeleine J. H.
海洋变暖对漂白事件的频率和严重程度的影响有很好的记录，但不同的共生藻类型提高珊瑚礁的生理耐受性的潜力还没有得到很好的理解。在这里，我们比较的功能和生理特性的少年珊瑚实验感染时，两个同源的共生藻类型之一，并暴露于热和光应力相结合。一套生理指标，包括叶绿素a荧光，氧气生产和呼吸，以及色素浓度一致表明较低的代谢成本和增强的生理耐受性的细轴孔珊瑚幼虫时，托管共生藻型C1相比，类型D。在其他研究中，相同的D-型已被证明赋予更高的耐热性比C2在成年人和C1在少年的密切相关的物种鹿角珊瑚millepora。我们的研究结果挑战了推测，即D型协会普遍最强大的热应力。虽然珊瑚的耐热性可能是偶然的共生藻株在hospite，我们的研究结果突出了共生伙伴之间的相互作用的复杂性和宿主因素在确定珊瑚礁的生理性能的潜在作用。
The impacts of warming seas on the frequency and severity of bleaching events are well documented, but the potential for different Symbiodinium types to enhance the physiological tolerance of reef corals is not well understood. Here we compare the functionality and physiological properties of juvenile corals when experimentally infected with one of two homologous Symbiodinium types and exposed to combined heat and light stress. A suite of physiological indicators including chlorophyll a fluorescence, oxygen production and respiration, as well as pigment concentration consistently demonstrated lower metabolic costs and enhanced physiological tolerance of Acropora tenuis juveniles when hosting Symbiodinium type C1 compared with type D. In other studies, the same D-type has been shown to confer higher thermal tolerance than both C2 in adults and C1 in juveniles of the closely related species Acropora millepora. Our results challenge speculations that associations with type D are universally most robust to thermal stress. Although the heat tolerance of corals may be contingent on the Symbiodinium strain in hospite, our results highlight the complexity of interactions between symbiotic partners and a potential role for host factors in determining the physiological performance of reef corals.