中国科学院南京地质古生物研究所机构知识库

A comparative study of the pattern of brachiopod extinction, survival and recovery in the end-Ordovician and end-Permian mass extinctions reveals a variety of patterns, magnitudes and intensities in South China. The presence of many survivors and the absence of any ordinal extinction of brachiopods across the Ordovician-Silurian transition indicates a close taxonomic and ecological relationship of pre- and post-extinction brachiopod associations. Brachiopods recovered rapidly in Late Rhuddanian (Early Silurian) after a short survival period. The taxonomic composition, biodiversity and ecological levels in the radiation period largely mirror those prior to the end-Ordovician extinction. In contrast, elimination of four major brachiopod orders, 20 superfamilies and almost all Permian-type genera after a short survival interval in the early Griesbachian and the absence of survival, Lazarus and progenitor genera suggest a great revolutionary turnover between Late Permian and Triassic brachiopod associations. Brachiopods underwent a long bleak interval from late Griesbachian to the beginning of the Middle Triassic. The brachiopod groups in the Anisian (Middle Triassic) recovery-radiation period are taxonomically linked to those in the Permian only at family or higher levels. Therefore, the taxonomic and paleoecological effects of the end-Ordovician extinction were of a lesser magnitude than for the end-Permian extinction of Brachiopoda in South China. (C) 2002 Elsevier Science B.V. All rights reserved.