RECOVERY OF THE CORAL MONTASTREA-ANNULARIS IN THE FLORIDA KEYS AFTER THE 1987 CARIBBEAN BLEACHING EVENT
RECOVERY OF THE CORAL MONTASTREA-ANNULARIS IN THE FLORIDA KEYS AFTER THE 1987 CARIBBEAN BLEACHING EVENT
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DOI：
10.1007/bf00302102
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发表时间：
1993-07-01
期刊：
影响因子：
3.5
通讯作者：
PORTER, JW
中科院分区：
文献类型：
--
作者：
FITT, WK;SPERO, HJ;PORTER, JW
在 1987 年加勒比海的珊瑚白化事件中，许多造礁珊瑚和其他刺胞动物失去了光合色素和共生藻类（虫黄藻）。佛罗里达礁区包括一些最早有记录的案例，从 8 月下旬开始，蒙塔斯特里亚环形珊瑚大面积白化。 1988 年 3 月，卡里斯福特礁 (Carysfort Reef) 的照片横断面显示该物种超过 90% 的菌落变色，而 1986 年 7 月为 0%；然而，1986 年至 1988 年间没有观察到死亡。1988 年 2 月至 6 月收集的珊瑚样本中，虫黄藻密度范围从最浅色珊瑚的 0.1 到较深珊瑚的 1.6 x 10(6) 细胞/平方厘米。到1989年8月，最小密度增加到0.5 x 10(6)细胞/cm2。在虫黄藻密度较低的珊瑚中，虫黄藻的叶绿素a含量和虫黄藻有丝分裂指数显着较高，这表明低密度的虫黄藻可能比未漂白的珊瑚更营养充足。珊瑚组织的无灰干重与所有采样时间的虫黄藻密度均呈正相关，并且与 1989 年 8 月相比，1988 年 6 月显着降低。1989 年 8 月每平方厘米的蛋白质和脂质显着高于 1988 年 2 月或 6 月。虽然虫黄藻密度和珊瑚色素沉着可能在不到一年的时间内恢复到正常水平，但在低水平时期组织生物量和能量储存的再生会损失。共生体密度可能需要更长的时间。
Many reef-building corals and other cnidarians lost photosynthetic pigments and symbiotic algae (zooxanthellae) during the coral bleaching event in the Caribbean in 1987. The Florida Reef Tract included some of the first documented cases, with widespread bleaching of the massive coral Montastrea annularis beginning in late August. Phototransects at Carysfort Reef showed discoloration of >90% of colonies of this species in March 1988 compared to 0% in July 1986; however no mortality was observed between 1986 and 1988. Samples of corals collected in February and June 1988 had zooxanthellae densities ranging from 0.1 in the most lightly colored corals, to 1.6 x 10(6) cells/cm2 in the darker corals. Minimum densities increased to 0.5 x 10(6) cells/cm2 by August 1989. Chlorophyll-a content of zooxanthellae and zooxanthellar mitotic indices were significantly higher in corals with lower densities of zooxanthellae, suggesting that zooxanthellae at low densities may be more nutrient-sufficient than those in unbleached corals. Ash-free dry weight of coral tissue was positively correlated with zooxanthellae density at all sample times and was significantly lower in June 1988 compared to August 1989. Proteins and lipids per cm2 were significantly higher in August 1989 than in February or June, 1988. Although recovery of zooxanthellae density and coral pigmentation to normal levels may occur in less than one year, regrowth of tissue biomass and energy stores lost during the period of low symbiont densities may take significantly longer.