Ostracods from the end‐Permian mass extinction in the Aras Valley section (north‐west Iran)

Gliwa, Jana; Forel, Marie‐Béatrice; Crasquin, Sylvie; Ghaderi, Abbas; Korn, Dieter

doi:10.1002/spp2.1330

Cited by 14 publications

(13 citation statements)

References 96 publications

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“…2005; Gliwa et al . 2021). A comparison of δ 18 O values from shell material processed with and without hot acetolysis showed no significant difference of the δ 18 O shell values between the different processing methods (Appendix ).…”

Section: Methodsmentioning

confidence: 99%

Gradual warming prior to the end‐Permian mass extinction

et al. 2022

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The biggest known mass extinction in the history of animal life occurred at the Permian–Triassic boundary and has often been linked to global warming. Previous studies have suggested that a geologically rapid (<40 kyr) temperature increase of more than 10°C occurred simultaneously with the main extinction pulse. This hypothesis is challenged by geochemical and palaeontological data indicating profound environmental perturbations and a temperature rise prior to the main extinction. Using secondary ion mass spectrometry (SIMS), we measured oxygen isotope ratios from Changhsingian (late Permian) ostracods of north‐western Iran. Our data show that ambient seawater temperature began to rise at least 300 kyr prior to the main extinction event. Gradual warming by approximately 12°C was probably responsible for initial environmental degradation that eventually culminated in the global end‐Permian mass extinction.

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Section: Methodsmentioning

confidence: 99%

Gradual warming prior to the end‐Permian mass extinction

et al. 2022

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“…Extant Bairdiidae furthermore have important adaptabilities to cope with low O 2 levels for several hours (Forel, personal observations and work in progress), which would have allowed them to adapt to stressful environments following the EPE based on uniformitarianism. It is worth noting that another type of survival of Bairdiidae in the absence of microbial deposits following the crisis in northwest Iran is currently under description and analysis (Gliwa et al 2018(Gliwa et al , 2020.…”

Section: A New Understanding Of Ostracod Diversity Through the Epe: S...mentioning

confidence: 99%

Ostracods after the end-Permian extinction in South China: insights into non-microbial survival

Forel¹,

Bercovici²,

Yu³

2020

mpal

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The taxonomy of ostracods from one deep-water, one shallow shelf and three paralic sections spanning the end-Permian extinction in South China (Guizhou and Yunnan) is summarized and discussed.We report on the occurrence of nine species, including mass occurrences of Hollinella panxiensis Wang, on the surface of these clastic Permian-Triassic transitional beds. The preservation of the material allows for the description of the central muscle scar field of Langdaia suboblonga Wang, which is the first observation of this character for the genus. These firstly described assemblages differ from those from post-extinction microbial deposits in being dominated by Palaeocopida. They illustrate survival without recovery after the end-Permian crisis, as none of the reported taxa participated in the subsequent Triassic diversification. We relate this phenomenon to clastic input and show that the patchy survival of benthic faunas following the crisis is an interplay between environments and adaptive potential. The persistence of Palaeocopida as a function of their depth distribution is discussed with the illustration of short-term survival of Hollinellidae in shallow areas, as opposed to the survival of Kirkbyidae in deep-marine waters until, at least, the Late Triassic.

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“…Ostracods show a significant turnover due to the end-Permian event, yet a broad range of Permian survivors and newly evolved species dominated a "survival stage" into the earliest Griesbachian and a subsequent "poverty phase" from the Griesbachian Isarcicella staeschei conodont zone into the Dienerian (Crasquin and Forel 2014). Furthermore, the ostracods from the survival stage are typically associated with microbialite facies (Crasquin-Soleau et al 2004;Forel 2012Forel , 2014Forel et al 2013aForel et al ,b, 2015Crasquin and Forel 2014;Wan et al 2019), with only a few exceptions (Foster et al 2019b;Qiu et al 2019;Gliwa et al 2020a, b). The co-occurrence of microbialites and ostracods led Forel et al (2013b) to suggest that microbial mats provided favorable settings, or refuges, during the extinction interval that could support diverse and abundant ostracod communities.…”

Section: Introductionmentioning

confidence: 99%

Decoupling of morphological disparity and taxonomic diversity during the end-Permian mass extinction

et al. 2021

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An increasing number of unexpectedly diverse benthic communities are being reported from microbially precipitated carbonate facies in shallow-marine platform settings after the end-Permian mass extinction. Ostracoda, which was one of the most diverse and abundant metazoan groups during this interval, recorded its greatest diversity and abundance associated with these facies. Previous studies, however, focused mainly on taxonomic diversity and, therefore, left room for discussion of paleoecological significance. Here, we apply a morphometric method (semilandmarks) to investigate morphological variance through time to better understand the ecological consequences of the end-Permian mass extinction and to examine the hypothesis that microbial mats played a key role in ostracod survival. Our results show that taxonomic diversity and morphological disparity were decoupled during the end-Permian extinction and that morphological disparity declined rapidly at the onset of the end-Permian extinction, even though the high diversity of ostracods initially survived in some places. The decoupled changes in taxonomic diversity and morphological disparity suggest that the latter is a more robust proxy for understanding the ecological impact of the extinction event, and the low morphological disparity of ostracod faunas is a consequence of sustained environmental stress or a delayed post-Permian radiation. Furthermore, the similar morphological disparity of ostracods between microbialite and non-microbialite facies indicates that microbial mats most likely represent a taphonomic window rather than a biological refuge during the end-Permian extinction interval.

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Ostracods from the end‐Permian mass extinction in the Aras Valley section (north‐west Iran)

Cited by 14 publications

References 96 publications

Gradual warming prior to the end‐Permian mass extinction

Gradual warming prior to the end‐Permian mass extinction

Ostracods after the end-Permian extinction in South China: insights into non-microbial survival

Decoupling of morphological disparity and taxonomic diversity during the end-Permian mass extinction

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