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Size variations in foraminifers from the early Permian to the Late Triassic: Implications for the Guadalupian-Lopingian and the Permian-Triassic mass extinctions

Feng, Yan; Song, Haijun; Bond, David P.G.

Authors

Yan Feng

Haijun Song



Abstract

The final 10 Myr of the Paleozoic saw two of the biggest biological crises in Earth history: the middlePermian extinction (often termed the Guadalupian–Lopingian extinction [GLE]) that was followed 7–8 Myr later by Earth's most catastrophic loss of diversity, the Permian–Triassic mass extinction (PTME). These crises are not only manifest as sharp decreases in biodiversity and—particularly for the PTME—total ecosystem collapse, but they also drove major changes in biological morphological characteristics such as the Lilliput effect. The evolution of test size among different clades of foraminifera during these two extinction events has been less studied. We analyzed a global database of foraminiferal test size (volume) including 20,226 specimens in 464 genera, 98 families, and 9 suborders from 632 publications. Our analyses reveal significant reductions in foraminiferal mean test size across the Guadalupian/Lopingian boundary (GLB) and the Permian/Triassic boundary (PTB), from 8.89 to 7.60 log10 μm3 (lg μm3) and from 7.25 to 5.82 lg μm3, respectively. The decline in test size across the GLB is a function of preferential extinction of genera exhibiting gigantism such as fusulinoidean fusulinids. Other clades show little change in size across the GLB. In contrast, all Lopingian suborders in our analysis (Fusulinina, Lagenina, Miliolina, and Textulariina) experienced a significant decrease in test size across the PTB, mainly due to size-biased extinction and within-lineage change. The PTME was clearly a major catastrophe that affected many groups simultaneously, and the GLE was more selective, perhaps hinting at a subtler, less extreme driver than the later PTME.

Citation

Feng, Y., Song, H., & Bond, D. P. (2020). Size variations in foraminifers from the early Permian to the Late Triassic: Implications for the Guadalupian-Lopingian and the Permian-Triassic mass extinctions. Paleobiology, 46(4), 511-532. https://doi.org/10.1017/pab.2020.37

Journal Article Type Article
Acceptance Date Aug 1, 2020
Online Publication Date Sep 30, 2020
Publication Date 2020-11
Deposit Date Nov 9, 2020
Publicly Available Date Mar 31, 2021
Journal Paleobiology
Print ISSN 0094-8373
Electronic ISSN 1938-5331
Publisher Cambridge University Press
Peer Reviewed Peer Reviewed
Volume 46
Issue 4
Pages 511-532
DOI https://doi.org/10.1017/pab.2020.37
Keywords Ecology; Palaeontology; Ecology, Evolution, Behavior and Systematics; General Agricultural and Biological Sciences
Public URL https://hull-repository.worktribe.com/output/3659460
Publisher URL https://www.cambridge.org/core/journals/paleobiology/article/size-variations-in-foraminifers-from-the-early-permian-to-the-late-triassic-implications-for-the-guadalupianlopingian-and-the-permiantriassic-mass-extinctions/DB59C2834902647C5BD1CB480F990B3A

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©2020 The authors. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright holder





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