El Nino related coral bleaching in Palau, Western Caroline Islands
El Nino related coral bleaching in Palau, Western Caroline Islands
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DOI：
10.1007/s003380100151
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发表时间：
2001-09-01
期刊：
影响因子：
3.5
通讯作者：
Toscano, MA
中科院分区：
文献类型：
--
作者：
Bruno, JF;Siddon, CE;Toscano, MA
大规模珊瑚白化目前被视为对珊瑚礁社区长期健康的主要威胁。在这里，我们量化珊瑚漂白帕劳符合1997/1998年厄尔尼诺南方涛动事件和当地海表温度31 degreesC，这是1.0-1.25 degreesC高于长期，卫星派生的气候最高月平均值为该地区。我们对9个地点进行了采样，包括受保护的泻湖和边缘礁、垂直礁壁和裸露的堡礁。活石珊瑚组织漂白的百分比为53.4 +/- 6.2（范围：32.3 - 2.5）。79.3，n=8个部位），10-12 m处为68.9 +/- 6.2（45.7-91.7，n=6个部位），不同深度之间无显著差异。漂白硬珊瑚的总体平均覆盖率为18.9 +/- 1.5（平均+/- 1 SE，n = 9个站点），而健康珊瑚的覆盖率仅为15.6 +/- 2.0。近一半（48%）的946个调查殖民地属于20个石珊瑚类群完全漂白，而15%的部分漂白。总体而言，结果表明，1998年在帕劳的珊瑚漂白事件是相对严重的，广泛的深度，网站，栖息地和珊瑚类群。
Mass coral bleaching is currently viewed as a major threat to the long-term health of coral reef communities. Here we quantify coral bleaching in Palau coincident with the 1997/1998 El Nino Southern Oscillation event and with local sea surface temperatures of 31 degreesC, which were 1.0-1.25 degreesC higher than long-term, satellite-derived climatological maximum monthly means for the region. We sampled nine sites, including protected lagoon and fringing reefs, vertical reef walls, and exposed barrier reefs. The percentage of living scleractinian coral tissue that was bleached was 53.4 +/- 6.2 (range: 32.3.-79.3, n=8 sites) at 3-5 m depth and 68.9 +/- 6.2 (45.7-91.7, n=6 sites) at 10-12 m and did not differ significantly between depths. The overall mean percent cover of bleached scleractinians was 18.9 +/- 1.5 (mean +/- 1 SE, n = 9 sites), while the cover of healthy corals was only 15.6 +/- 2.0. Nearly half (48%) of 946 surveyed colonies belonging to 20 scleractinian taxa were totally bleached, while 15% were partially bleached. Overall, the results indicate that the 1998 coral bleaching episode in Palau was relatively severe and widespread across depths, sites, habitats, and coral taxa.