Diversity and species abundance patterns of the Early Cambrian (Series 2, Stage 3) Chengjiang Biota from China
Diversity and species abundance patterns of the Early Cambrian (Series 2, Stage 3) Chengjiang Biota from China
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DOI：
10.1666/12056
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Fangchen Zhao;Jean‐Bernard Caron;D. Bottjer;Shi-xue Hu;Z. Yin;Maoyan Zhu
中科院分区：
文献类型：
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作者：
Fangchen Zhao;Jean‐Bernard Caron;D. Bottjer;Shi-xue Hu;Z. Yin;Maoyan Zhu
摘要前寒武纪-寒武纪过渡期的Lagerstätten一直是理解“寒武纪大爆发”古生态学的一个相对未开发的资源。根据澄江生物群第二系第三阶段（下寒武统）11门15类100种10，238件化石标本，进行了定量古生态研究。化石被系统地收集在一个2.5米厚的序列中，该序列被划分为10个地层间隔。每个间隔代表一个诱导的时间平均组合的各种事件（obrution）床的未知持续时间。总的来说，不同的化石组合在分类学和生态学上是相似的，这表明存在一个单一的社区类型在整个马坊段。马坊群落主要由底栖游猎或食腐动物、无柄悬食性动物和底栖游猎或食腐动物组成，分别以节肢动物、腕足动物和灵长类动物为主。大多数物种丰度低、出现频率低，而少数物种数量丰富且出现频繁。总的来说，马坊群落在结构和生态学上可与中寒武世（系列3，阶段5）伯吉斯页岩生物群（Walcott采石场，Yoho国家公园，不列颠哥伦比亚省，加拿大）相媲美。这表明，尽管在分类学和生态组内的物种身份的变化，寒武纪伯吉斯页岩型社区的结构和生态保持相对稳定，直到至少中寒武世（系列3，阶段5）在潮下带相对深水离岸设置在silicicicopartum软基质环境。
Abstract Lagerstätten from the Precambrian–Cambrian transition have traditionally been a relatively untapped resource for understanding the paleoecology of the “Cambrian explosion.” This quantitative paleoecological study is based on 10,238 fossil specimens belonging to 100 animal species, 11 phyla, and 15 ecological categories from the lower Cambrian (Series 2, Stage 3) Chengjiang biota (Mafang locality near Haikou, Yunnan Province, China). Fossils were systematically collected within a 2.5-meter-thick sequence divided into ten stratigraphic intervals. Each interval represents an induced time-averaged assemblage of various event (obrution) beds of unknown duration. Overall, the different fossil assemblages are taxonomically and ecologically similar, suggesting the presence of a single community type recurring throughout the Mafang section. The Mafang community is dominated by epibenthic vagile hunters or scavengers, sessile suspension feeders, and infaunal vagile hunters or scavengers represented primarily by arthropods, brachiopods, and priapulids, respectively. Most species have low abundance and low occurrence frequencies, whereas a few species are numerically abundant and occur frequently. Overall, in structure and ecology the Mafang community is comparable to the Middle Cambrian (Series 3, Stage 5) Burgess Shale biota (Walcott Quarry, Yoho National Park, British Columbia, Canada). This suggests that, despite variations in species identity within taxonomic and ecological groups, the structure and ecology of Cambrian Burgess Shale-type communities remained relatively stable until at least the Middle Cambrian (Series 3, Stage 5) in subtidal to relatively deep-water offshore settings in siliciclastic soft-substrate environments.