寒武早期泥质基底腕足动物的生活策略——来自澄江动物群的证据  

Life strategies of Early Cambrian brachiopods on mud substrate:Inferences from the Chengjiang fauna of South China

作　　者：张志飞[1] 王妍[1] 汪洋[1] 韩健[1] 

机构地区：[1]西北大学地质学系/早期生命研究所/大陆动力学国家重点实验室,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2009年第6期1018-1025,I0014,I0015,共10页Journal of Northwest University（Natural Science Edition）

基　　金：西北大学大陆动力学国家重点实验室科技部专项;国家自然科学基金资助项目(40702005;40602003;40332016);国家基础发展规划基金资助项目(2006CB806401);西北大学研究生创新教育基金资助项目(优秀博士学位论文类)(07YYB01)

摘　　要：目的系统分析滇东泥质基底澄江化石库腕足动物的生活方式。方法依据澄江化石库丰富的腕足动物资料,论证寒武纪早期泥质基底腕足动物的生活策略。结果寒武纪早期泥质基底上腕足动物的生活方式主要包括肉茎附着型(pedicle-anchoring or pedicle-attaching)、自由平躺型(free-lying)、假内栖型(qusi-infaunal)和表栖粘附型(cemented epifaunal),肉茎附着型是早寒武世腕足动物生活的最普遍的型式。结论空间生态分析显示,早寒武世滇东海盆中,腕足动物的分布已经具有一定的空间层次性,不同的腕足类型占据了不同的生态位,形成了比较复杂的空间群落结构。Aim To infer the life strategies of Early Cambrian brachiopods on muddy substrate from the brachiopods in the Chengjiang fauna of Yunnan, China. Methods Based on observation of a number of specimens of 8 genera, several collusions are reached. Results Studies of the early Cambrian Chengjiang brachiopods suggest that several types of relationship of Cambrian brachiopods with the substrate where they inhabited, including pedicle-anchoring, free-lying, cemented epifaunal, semi-infaunal, of which attachment by a pedicle to the substrate was probably the commonest. Conclusion An analysis of the structure of fossil brachiopod communities in the Chengjiang soft-muddy substrate demonstrate that the Chengjiang brachiopod taxa, although inhabiting the same environment, could have occupied quite distinct tiers of space and ecological niche：Diandongia had a semi-infaunal mode of life, with its pedicle buried in sediment, and ventral valve lay on the sea bottom, and Heliomedusa was free-lying, but the coeval brachiopod genus Xianshanella and Longtancunella and Kutorgina tended to elevate its feeding structure through their stout pedicle to a higher level above the sea bottom. At the same time, the Lingulellotreta and Linguella was possibly suspended above turbulence at the sediment-water boundary.

关 键 词：早寒武世 澄江化石库 腕足动物 生活策略 生态位 

分 类 号：P534.41[天文地球—古生物学与地层学]