Energy reserves and metabolism as indicators of coral recovery from bleaching
Energy reserves and metabolism as indicators of coral recovery from bleaching
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DOI：
10.4319/lo.2007.52.5.1874
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发表时间：
2007-09
影响因子：
4.5
通讯作者：
L. Rodrigues;A. Grottoli
中科院分区：
文献类型：
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作者：
L. Rodrigues;A. Grottoli
随着虫黄藻、叶绿素a（Chl a）或两者的浓度降低，白化的珊瑚依靠能量储备（即脂质、碳水化合物、蛋白质）和异养作用的某种组合来生存和恢复。为了解长期恢复过程中能量储备和新陈代谢的动态，将多孔鹿角珊瑚（Porites compressa）和扁枝滨珊瑚（Montipora capitata）在室外水池中进行为期1个月的实验性白化处理（处理组珊瑚）。另外一些珊瑚在环境温度下的单独水池中饲养（对照组珊瑚）。在珊瑚礁上进行0、1.5、4或8个月的恢复。在0个月时，所有处理组珊瑚均为白色，其叶绿素a、脂质、碳水化合物、蛋白质、组织生物量和光合作用均低于对照组珊瑚。在恢复过程中，多孔鹿角珊瑚在8个月时补充了能量储备和组织生物量，而光合作用和叶绿素a分别在1.5个月和4个月时就已恢复。扁枝滨珊瑚在1.5个月时补充了能量储备，尽管叶绿素a和光合作用水平有所下降。多孔鹿角珊瑚依靠光合固定的碳从白化中恢复，而扁枝滨珊瑚则不然。总体而言，除叶绿素a浓度外，扁枝滨珊瑚在所有测量变量上的恢复速度都比多孔鹿角珊瑚快。随着白化现象加剧，未来珊瑚礁上的珊瑚多样性可能会有利于恢复速度更快的物种。
With reduced zooxanthellae, chlorophyll a (Chl a), or both, concentrations, bleached corals rely on some combination of energy reserves (i.e., lipid, carbohydrate, protein) and heterotrophy to survive and recover. To understand the dynamics of energy reserves and metabolism during long‐term recovery, Porites compressa and Montipora capitata corals were experimentally bleached in outdoor tanks for 1 month (treatment corals). Additional corals were maintained in separate tanks at ambient temperatures (control corals). Recovery occurred on the reef for 0, 1.5, 4, or 8 months. At 0 months all treatment corals were white in color, with lower Chl a, lipid, carbohydrate, protein, tissue biomass, and photosynthesis than control corals. During recovery, P. compressa replenished energy reserves and tissue biomass at 8 mo, long after photosynthesis and Chl a had recovered at 1.5 and 4 months, respectively. M. capitata replenished energy reserves at 1.5 months, despite decreased Chl a and photosynthesis levels. P. compressa depends on photosynthetically fixed carbon for recovery from bleaching, whereas M. capitata does not. Overall, M. capitata had a faster recovery rate than P. compressa for all measured variables except Chl a concentration. With intensifying bleaching, coral diversity on future reefs may favor species with faster recovery rates.