Temporal and Spatial Variations in spatial variations in symbiont communities of catch bowl coral Isopora palifera (Scleractinia: Acroporidae) on reefs in Kenting National Park, Taiwan
Temporal and Spatial Variations in spatial variations in symbiont communities of catch bowl coral Isopora palifera (Scleractinia: Acroporidae) on reefs in Kenting National Park, Taiwan
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台湾垦丁国家公园礁石上捕捞碗珊瑚 Isopora palifera（石珊瑚：顶孔珊瑚科）共生群落空间变化的时空变化
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发表时间：
2012
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通讯作者：
Chaolun Allen Chen
中科院分区：
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作者：
Chia;S. Keshavmurthy;V. Denis;C. Kuo;Jih;P. Meng;Chaolun Allen Chen
通过共生藻改组的适应性是造礁珊瑚在环境压力下生存的潜在机制之一。本研究以垦丁国家公园南湾潭仔湾的珊瑚Isopora palifera为研究对象，于2000年及2001年，探讨其耐热共生藻D1 a与热敏感共生藻C3对季节性海表温度变化的反应。在这项研究中，我们重新研究了时间动态的共生藻群落的I。2006-2009年在TZB的palifera。此外，还研究了I. 2009年在南湾的其他6个地点也检测了palifera，包括位于台湾南部的核电厂出口（NPP-OL）的一个地点，与其他地点相比，年平均SST高0.6-1.5 ℃。系统分型和DNA序列分析表明，共生甲藻核糖体28 S和ITS 2标记的系统分型和DNA序列分析表明，I. TZB的palifera菌落继续显示季节性洗牌，但在2006-2009年转变为热敏型C3占主导地位。这与1998年大规模漂白事件后的2000年和2001年最初由耐热共生藻D1 a主导的共生体群落不同。结果表明，南湾湿地共生体群落的空间变异具有显著性差异。NPP-OL的palifera菌落由共生藻D1 a占主导地位。我们的研究结果表明，我。palifera可以适应SST异常的洗牌耐热共生藻D1 a，并可以恢复到热敏C3时，应力消失，但将保持耐热共生藻D1 a作为优势共生体，如果热应力继续。
Acclimatization through Symbiodinium shuffling is one of potential mechanisms in reef-building corals to survive environmental stress. In our previous study, the catch bowl coral Isopora palifera in Tantzei Bay (TZB), Nanwan, Kenting National Park (KNP), southern Taiwan was demonstrated to shuffle thermal-tolerant Symbiodinium D1a and thermal-sensitive Symbiodinium C3 in response to seasonal variations in sea surface temperatures (SSTs) in 2000 and 2001. In this study, we reexamined the temporal dynamics of the Symbiodinium community of I. palifera in TZB in 2006-2009. In addition, spatial variations in Symbiodinium communities in I. palifera were also examined at 6 other sites of Nanwan, KNP in 2009, including a site located at a nuclear power plant outlet (NPP-OL) in southern Taiwan with a yearly mean SST 0.6-1.5 degrees C higher compared to the other sites. Phylotyping and DNA sequence analyses of Symbiodinium ribosomal 28S and ITS2 markers showed that I. palifera colonies at TZB continued to show seasonal shuffling, but shifted to thermal-sensitive type C3 dominant in 2006-2009. This differed from the symbiont community originally dominated by the thermal-tolerant Symbiodinium D1a in 2000 and 2001 after the 1998 mass-bleaching event. Significant differences in spatial variations of the symbiont community in Nanwan were detected with I. palifera colonies at the NPP-OL dominated by Symbiodinium D1a. Our study results suggest that I. palifera can acclimatize to SST anomalies by shuffling to thermal-tolerant Symbiodinium D1a and can revert to thermal-sensitive C3 when the stress disappears, but will maintain the thermally tolerant Symbiodinium D1a as the dominant symbiont if the heat stress continues.