Annual coral bleaching and the long-term recovery capacity of coral
Annual coral bleaching and the long-term recovery capacity of coral
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DOI：
10.1098/rspb.2015.1887
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发表时间：
2015-11
期刊：
影响因子：
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通讯作者：
V. Schoepf;A. Grottoli;Stephen J. Levas;Matthew D. Aschaffenburg;Justin H. Baumann;Y. Matsui;M. Warner
中科院分区：
文献类型：
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作者：
V. Schoepf;A. Grottoli;Stephen J. Levas;Matthew D. Aschaffenburg;Justin H. Baumann;Y. Matsui;M. Warner
预计本世纪晚些时候每年都会发生大规模的白化事件。然而，珊瑚是否能够在每年的白化事件之间恢复仍然是个未知数。使用相结合的坦克和现场实验，我们模拟每年漂白暴露三个加勒比海的珊瑚物种（滨珊瑚divaricata，滨珊瑚astreoides和Orbicella faveolata）在2个连续年的2.5周的高温。每年漂白压力对叶绿素a，能量储备，钙化，组织C和N同位素的影响进行了评估后，立即第二漂白和短期和长期恢复的珊瑚礁（1.5和11个月，分别）。而叉枝P. divaricata和O. Faveolata能够在1年内从重复漂白中恢复，P. astreoides经历了累积损伤，阻止了在此时间范围内的完全恢复，表明重复漂白降低了其恢复能力。具体地，P. astreoides不能恢复蛋白质和碳水化合物浓度。由于能源储备促进了抗漂白能力，如果不能在1年内从每年的漂白中恢复过来，可能会导致对热敏感的珊瑚物种在未来灭绝。
Mass bleaching events are predicted to occur annually later this century. Nevertheless, it remains unknown whether corals will be able to recover between annual bleaching events. Using a combined tank and field experiment, we simulated annual bleaching by exposing three Caribbean coral species (Porites divaricata, Porites astreoides and Orbicella faveolata) to elevated temperatures for 2.5 weeks in 2 consecutive years. The impact of annual bleaching stress on chlorophyll a, energy reserves, calcification, and tissue C and N isotopes was assessed immediately after the second bleaching and after both short- and long-term recovery on the reef (1.5 and 11 months, respectively). While P. divaricata and O. faveolata were able to recover from repeat bleaching within 1 year, P. astreoides experienced cumulative damage that prevented full recovery within this time frame, suggesting that repeat bleaching had diminished its recovery capacity. Specifically, P. astreoides was not able to recover protein and carbohydrate concentrations. As energy reserves promote bleaching resistance, failure to recover from annual bleaching within 1 year will likely result in the future demise of heat-sensitive coral species.