The Jiwozhai patch reef: A palaeobiodiversity hotspot in middle Givetian (Devonian) of South China
The Jiwozhai patch reef: A palaeobiodiversity hotspot in middle Givetian (Devonian) of South China
复制标题
DOI：
10.1016/j.palaeo.2020.109895
复制
发表时间：
2020-10-15
影响因子：
3
通讯作者：
Qie, Wenkun
中科院分区：
文献类型：
--
作者：
Huang, Jiayuan;Liang, Kun;Qie, Wenkun
本研究是对位于中国南部台地内部的中吉维(中泥盆世)高多样性斑块生物礁进行了详细的古生物和古生态分析。地点为贵州省吉沃寨独山组。通过对斑块礁垂直剖面28个样方的详细统计分析，共鉴定出暗礁生物83种(其中待定种23种)，隶属于44属。主要的造礁生物是层状和结壳行为的叠层孔虫、层状扁平珊瑚和层状结壳珊瑚，它们构成了构成礁体框架的盖石，而丰富的块状和分枝的片状珊瑚和孤立的皱纹珊瑚也对珊瑚礁的形成起着重要作用，因为它们填满了盖岩组件之间的空间。腕足类、苔藓类、管虫、钙化蓝藻和腹足类等珊瑚礁生物在鸡窝寨斑块礁中分布较少，对分布格局影响不大。与吉沃寨密集分布的物种一致，不同的生物之间也发现了复杂的生态关系，包括广泛的结壳、空间竞争和共生。地台内部吉沃寨斑块礁生物多样性水平较高，说明了解不同生境的物种丰富度和功能群的多样性是吉维斯堡礁生态系统重建的关键。补丁礁在台地内部的位置可能是生物群高度多样性的原因。基窝寨斑块生物礁的研究结果表明，该区生物礁结构稳定，主要造礁主体分布均匀，生态关系复杂。物种多样性的高水平是南中国的一个共同特征，也是吉维德时期许多其他古洲的地方的共同特征。
This study is a detailed palaeontological and palaeoecological analysis of a middle Givetian (Middle Devonian) high-diversity patch reef located in a platform interior setting in South China. The location is Jiwozhai, Guizhou Province, in the Dushan Formation. A total of 83 species (including 23 undetermined species) belonging to 44 genera of reef organisms were identified, based on a detailed statistical analysis from 28 quadrats on the vertical section of the patch reef. The main reef builders are laminar and encrusting-behaviour stromatoporoids, laminar tabulate corals, and laminar encrusting chaetetids, forming coverstones to build the reef framework, while abundant massive and branching tabulate corals and solitary rugose corals are also important for the formation of the reef by filling the spaces between the components of the coverstones. Reef dwellers including brachiopods, bryozoans, tubeworms, calcified cyanobacteria and gastropods, are only scarcely distributed in the Jiwozhai patch reef, having little impact on the distribution pattern. Consistent with the densely distributed species at Jiwozhai, complex ecological relationships, including extensive encrustations, spatial competition, and symbiosis have also been found among different organisms. The high biodiversity level of the Jiwozhai patch reef in platform interior emphasizes that understanding of species richness and diversity of functional groups in different habitats is critical for Givetian reef ecosystem reconstruction. Location of the patch reef in a platform interior may be the reason for the high diversity biota. The results from the Jiwozhai patch reef are evidence for a stable reef structure with evenly distributed major reef-frame builders and complex ecological relationships. The high level of species diversity is a common feature in South China, as well localities of many other palaeocontinents during the Givetian Period.