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Early and Middle Triassic trends in diversity, evenness, and size of foraminifers on a carbonate platform in south China; implications for tempo and mode of biotic recovery from the end-Permian mass extinction

Jonathan L. Payne, Mindi Summers, Brianna L. Rego, Demir Altiner, Wei Jiayong, Yu Meiyi and Daniel J. Lehrmann
Early and Middle Triassic trends in diversity, evenness, and size of foraminifers on a carbonate platform in south China; implications for tempo and mode of biotic recovery from the end-Permian mass extinction
Paleobiology (August 2011) 37 (3): 409-425

Abstract

Delayed biotic recovery from the end-Permian mass extinction has long been interpreted to result from environmental inhibition. Recently, evidence of more rapid recovery has begun to emerge, suggesting the role of environmental inhibition was previously overestimated. However, there have been few high-resolution taxonomic and ecological studies spanning the full Early and Middle Triassic recovery interval, leaving the precise pattern of recovery and underlying mechanisms poorly constrained. In this study, we document Early and Middle Triassic trends in taxonomic diversity, assemblage evenness, and size distribution of benthic foraminifers on an exceptionally exposed carbonate platform in south China. We observe gradual increases in all metrics through Early Triassic and earliest Middle Triassic time, with stable values reached early in the Anisian. There is little support in our data set for a substantial Early Triassic lag interval during the recovery of foraminifers or for a stepwise recovery pattern. The recovery pattern of foraminifers on the GBG corresponds well with available global data for this taxon and appears to parallel that of many benthic invertebrate clades. Early Triassic diversity increase in foraminifers was more gradual than in ammonoids and conodonts. However, foraminifers continued to increase in diversity, size, and evenness into Middle Triassic time, whereas diversity of ammonoids and conodonts declined. These contrasts suggest decoupling of recovery between benthic and pelagic environments; it is unclear whether these discrepancies reflect inherent contrasts in their evolutionary dynamics or the differential impact of Early Triassic ocean anoxia or associated environmental parameters on benthic ecosystems.


ISSN: 0094-8373
EISSN: 1938-5331
Coden: PALBBM
Serial Title: Paleobiology
Serial Volume: 37
Serial Issue: 3
Title: Early and Middle Triassic trends in diversity, evenness, and size of foraminifers on a carbonate platform in south China; implications for tempo and mode of biotic recovery from the end-Permian mass extinction
Affiliation: Stanford University, Department of Geological and Environmental Sciences, Stanford, CA, United States
Pages: 409-425
Published: 201108
Text Language: English
Publisher: Paleontological Society, Lawrence, KS, United States
References: 87
Accession Number: 2011-055253
Categories: Invertebrate paleontologyStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Annotation: NSF Grant EAR-0807377
Illustration Description: illus. incl. sect., 4 tables, geol. sketch map
N25°19'60" - N26°00'00", E106°40'00" - E107°00'00"
Secondary Affiliation: Middle East Technical University, TUR, TurkeyGuizhou Geological Survey, CHN, ChinaGuizhou University, CHN, ChinaUniversity of Wisconsin-Oshkosh, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, The Paleontological Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201132
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