云南鹤庆晚第四纪介形类生态特征初探

A PRELIMINARY ECOLOGICAL ANALYSIS ON THE LATE QUATERNARY OSTRACODES FROM THE HEQING BASIN, YUNNAN

云南鹤庆盆地晚第四纪钻孔剖面分析出介形类 13属 ,32种 ,多为地方性属种。根据介形类丰度、分异度、百分含量及组合分子在剖面中的分布情况 ,结合剖面同步分析的总有机碳含量 (TOC)、碳 -氮比 (C/ N)、碳酸盐含量、孢粉等数据 ,并利用已有相关的介形类生态资料 ,对介形类生态特征进行初步探讨。研究结果表明 :温度、矿化度、水流动态、水循环状况、p H值、深度、湖泊流域生产力等环境因素对介形类组合面貌、定量数据、壳饰等特征均有一定影响。其中 ,介形类丰度、分异度与温度、矿化度关系最为密切。

Thirty two species belonging to thirteen genera of ostracodes are identified from the Late Quaternary core HQ in the Heqing Basin, Yunnan, southwestern China. Most of them are attributed to endemic taxa. Based on the ostracode vertical changes, their ecological information, and the other environmental proxies (carbonate content, total organic carbon, carbon and nitrogen ratio etc.)in the core, the ostracode ecological features are preliminarily discussed. Temperature and mineralization are dominant in controlling ostracode assemblages. Some other environmental factors, such as pH value, depth, current characteristic and limnic productivity are also used to interpret the varieties of the ostracode composition, abundance, diversity and the ornamentation of the ostracode carapace.