脑珊瑚白化率与海水微量元素的相关性分析--美属维尔京群岛珊瑚科学考察

摘要

脑珊瑚（Diploria strigosa）主要分布在大西洋的加勒比海地区的美属维尔京群岛圣约翰岛 Great Lameshur Bay，种类很少,珊瑚白化现象严重。该文采用样带场地调查脑珊瑚数量和白化率统计法，结合电感耦合等离子体质谱仪测试技术对海水中微量元素检测分析，对脑珊瑚白化率与微量元素的相关性进行分析，结果表明：水温27.83～28.88℃、pH值8.5～8.7、盐度32.74％～34.04％，海水深度0～4m，微量元素有 V、Cr、Rb、Sr、Ag。钒（ V）含量低于99.1 ng/ml，脑珊瑚白化率与钒（ V）元素含量有弱相关性；铬（Cr）含量低于23.5ng/ml，脑珊瑚白化率与铬（Cr）元素含量有相关性；银（Ag）含量在34.1～56.3 ng/ml范围，脑珊瑚白化率与银（Ag）元素含量具有很强的相关性。%Brain coral is mainly distributed in the Great Lameshur Bay of the U.S. Virgin lslands in the Caribbean. lt has very rare species, but the bleaching phe-nomenon is severe. ln this study, the numbers and bleaching rates of brain corals in the sampling plots were investigated, and the trace elements contents in the seawater were determined with inductively coupled plasma-mass spectrometry (lCP-MS). Then the correlation between the bleaching rate of brain coral and trace ele-ments contents in seawater was analyzed. The results showed that under tempera-ture of 27.83-28.88 ℃, pH of 8.5-8.7, salinity of 32.74%-34.04% and depth of 0-4 m, there were V, Cr, Rb, Sr, Ag and other trace elements in seawater. When the V content was lower than 99.1 ng/ml, the bleaching rate of brain coral was weakly correlated to V content in seawater; when the Cr content was lower than 23.5 ng/ml, the bleaching rate of brain coral was correlated to Cr content; when the Ag content ranged from 34.1-56.3ng/ml, there was a significant correlation between bleaching rate of brain coral and Ag content in seawater.