Taxonomic and ecological variations of Permian-Triassic transitional bivalve communities from the littoral clastic facies in southwestern China
Taxonomic and ecological variations of Permian-Triassic transitional bivalve communities from the littoral clastic facies in southwestern China
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中国西南滨海碎屑岩相二叠纪-三叠纪过渡期双壳类群落的分类与生态变化
DOI：
10.1016/j.palaeo.2018.02.027
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发表时间：
2019-04
期刊：
影响因子：
--
通讯作者：
Yunfei Huang
中科院分区：
文献类型：
--
作者：
Ting Song;Jinnan Tong;Li Tian;Daoliang Chu;Yunfei Huang
在最近的二叠纪大灭绝之后，双壳类动物群在二叠纪-三叠纪过渡层（PTTB），特别是在华南沿岸碎屑岩相中定居。二叠纪-三叠纪（P-Tr）过渡性双壳类动物群由遗留、长期存活和新进化的分类群组成，具有中等多样性和高优势度的特点。然而，这种滨海碎屑相双壳动物群的分类和生态学尚未得到很好的了解，特别是与近海海洋记录相比。本文对中国西南5个滨海碎屑相剖面的P-Tr过渡双壳类动物群进行了研究，有助于更好地了解P-Tr过渡时期底栖生物群落的生态过程。在五个剖面的开头组下部和飞仙关组基部的PTTB中，共鉴定出双壳类13属20种。聚类分析表明，过渡性双壳类动物群可进一步划分为两个连续的群落（早期和晚期群落），每个群落由5个组合组成。promyalina - neoschizodusus群落（早期群落）具有保留类群存在、分类多样性和均匀性高、浅水悬浮食饵丰富等特点。在群落内（晚期群落），分类多样性和均匀性较低，固定的浮食者比浅的浮食者增加。此外，从咸淡咸水湖到浅海，原藻目-新schizodusus群落沿环境梯度呈现出明显的空间变异，而翼目群落则在横向上较为均匀。研究区原齿目-新节肢目群落属于晚二叠纪，翼目群落属于早三叠纪。因此，在中国西南地区，双壳类生物群落的分类学和生态学上发生了显著的转换，发生在promyalina - neoschizodusus群落和pteriacus群落之间。
Immediately after the latest Permian mass extinction, bivalve faunas colonized the Permian-Triassic Transitional Beds (PTTB), especially in littoral clastic facies of South China. The Permian-Triassic (P-Tr) transitional bivalve fauna is composed of holdovers, long-term survivors and newly evolved taxa, and characterized by moderate diversity and high dominance. However, the taxonomy and ecology of this bivalve fauna of littoral clastic facies have not been well understood, especially in comparison with offshore marine records. This paper presents a study on a P-Tr transitional bivalve fauna from five sections of littoral clastic facies in southwestern China, and as such it contributes to a better knowledge of the ecological processes of benthic communities during the P-Tr transition. In total, 20 species in 13 genera of bivalves are identified from the PTTB in the lower part of the Kayitou Formation and the basal part of the Feixianguan Formation of the five sections. Cluster analysis suggests that the transitional bivalve fauna could be further divided into two successive communities (early and late communities), and each is composed of five assemblages.Promyalina–Neoschizoduscommunity (early community) is characterized by presence of holdover taxa, high taxonomic diversity and evenness, and more abundant shallow infaunal suspension feeders. InPteriacommunity (late community), taxonomic diversity and evenness are much lower, and stationary epifaunal suspension feeders boost at the expense of shallow infaunal suspension feeders compared with thePromyalina–Neoschizoduscommunity. Furthermore, thePromyalina–Neoschizoduscommunity shows a clear spatial variation along environmental gradient from brackish lagoon to shallow marine settings, while thePteriacommunity is more uniform and homogeneous laterally. ThePromyalina–Neoschizoduscommunity in the studied region is of latest Permian age while thePteriacommunity should belong to the earliest Triassic. Consequently, a significant taxonomical and ecological turnover of bivalve communities occurred between thePromyalina–Neoschizoduscommunity and thePteriacommunity during the extinction interval in southwestern China.
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作者：
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影响因子：
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作者：
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DOI：
--
发表时间：
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DOI：
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发表时间：
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期刊：
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