涠洲岛西局部造礁石珊瑚盖度和大小频率分布

Coral Coverage and Size-Frequency Distribution of Local Scleractinian Corals in the West of Weizhou Island

关键词:  涠洲岛  珊瑚  盖度  大小频率分布  对数转换

Key words:  Weizhou Island  coral  coverage  size-frequency distribution  logarithmic transformation

摘要:

本研究通过分析珊瑚大小频率分布，探讨涠洲岛西局部造礁石珊瑚群落结构特点和种群动态，以了解珊瑚的生活史和所经历的变化。所分析的珊瑚大小数据来自2021年2月24-26日开展的涠洲岛西珊瑚礁的造礁石珊瑚样带调查，利用对数转换将珊瑚大小变换为珊瑚迭代，然后作直方图对珊瑚大小频率分布加以分析。分析结果表明，片状的牡丹珊瑚属Pavona和块状的滨珊瑚属Porites、角蜂巢珊瑚属Favites、盘星珊瑚属Dipsastraea等在涠洲岛西局部珊瑚群落中占优势(珊瑚面积和珊瑚个数)。对数转换的大小频率分布呈正态分布，偏斜不明显，变异系数小于0.5，表明这些珊瑚目前处于正常的自然补充、生长和死亡过程。涠洲岛西局部造礁石珊瑚盖度降低，主要是因为个体大的枝状珊瑚锐减。

Abstract:

In this study,by analyzing the size-frequency distribution of coral,the community structure characteristics and population dynamics of local scleractinian corals in the west of Weizhou Island were discussed to understand the life history and changes of corals.The coral size data analyzed are from the survey of scleractinian coral transects in the western coral reef of Weizhou Island from February 24 to 26,2021.The coral size is transformed into coral iteration by logarithmic transformation,and then the histogram is used to analyze the size-frequency distribution of coral.Analysis results show that foliaceous corals of Pavona and massive corals of Porites,Favites,and Dipsastraea are dominant in local coral communities in the west of Weizhou Island,and they were the main body of coral area and coral number.The size-frequency distribution of logarithmic transformation is a normal distribution,the skewness is not obvious,and the coefficient of variation is less than 0.5,indicating that these corals are currently in a normal natural replenishment,growth and death process.The decrease in the coverage of local scleractinian corals in the west of Weizhou Island is mainly due to the sharp decline of individual large dendritic corals.