End-Triassic crisis and “unreefing” led to the demise of the Dachstein carbonate platform: A revised model and evidence from the Transdanubian Range, Hungary

Pálfy, József; Kovács, Zsófía; Demény, Attila; Vallner, Zsolt

doi:10.1016/j.gloplacha.2021.103428

Cited by 7 publications

(3 citation statements)

References 65 publications

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“…Thus, while large evolutionary events may have global signatures in the fossil record, they may also display regional epicentres due to the interactions of spatially non-random controls on diversity with diversity drivers operating at global scales. Across the TJME, reefs were widely distributed, and so their relationship with global diversity approached a global trend, rather than displaying any distinct regionalisation, with previous studies confirming the severity of the event for reefs globally 50 , 59 , 60 .…”

Section: Discussionmentioning

confidence: 55%

Global diversity dynamics in the fossil record are regionally heterogeneous

2022

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Global diversity patterns in the fossil record comprise a mosaic of regional trends, underpinned by spatially non-random drivers and distorted by variation in sampling intensity through time and across space. Sampling-corrected diversity estimates from spatially-standardised fossil datasets retain their regional biogeographic nuances and avoid these biases, yet diversity-through-time arises from the interplay of origination and extinction, the processes that shape macroevolutionary history. Here we present a subsampling algorithm to eliminate spatial sampling bias, coupled with advanced probabilistic methods for estimating origination and extinction rates and a Bayesian method for estimating sampling-corrected diversity. We then re-examine the Late Permian to Early Jurassic marine fossil record, an interval spanning several global biotic upheavals that shaped the origins of the modern marine biosphere. We find that origination and extinction rates are regionally heterogenous even during events that manifested globally, highlighting the need for spatially explicit views of macroevolutionary processes through geological time.

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Section: Discussionmentioning

confidence: 55%

Global diversity dynamics in the fossil record are regionally heterogeneous

2022

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“…The close similarities in skeletal abundance and diversity patterns across the Triassic/Jurassic boundary between the widely separated regions (~500 km) of the Lombardy Basin and the Apennine Platform are also representative of a more general pattern across the western Tethys. This pattern of reduced animal abundance across the Triassic/Jurassic boundary followed by establishment of abiotic and microbial carbonate factories during the Early Jurassic occurred also in the Northern Calcareous Alps in Austria (McRoberts et al, 1997), the Transdanubian Range in Hungary (Pálfy et al, 2021), the central and northern Apennines of Italy (Barattolo & Romano, 2005; Brandano et al, 2016; Mancinelli et al, 2005), western Sicily (Todaro et al, 2017, 2018), Greece (Romano et al, 2008), and Turkey (Coskun Tunaboylu et al, 2014). The recovery of skeletal abundance to pre‐extinction levels in shallow‐marine environments across western Tethyan carbonate platforms occurred in upper Hettangian‐Sinemurian limestones with an increase in skeletal contribution from protists and mollusks.…”

Section: Discussionmentioning

confidence: 97%

“…The Triassic/ Jurassic boundary is marked by a subaerial exposure surface associated with a sea-level drop that can be traced across the entire Apennine Platform (Berra, 2012;Cirilli et al, 2015;Todaro et al, 2017). et al, 1997), the Transdanubian Range in Hungary (Pálfy et al, 2021), the central and northern Apennines of Italy (Barattolo & Romano, 2005;Brandano et al, 2016;Mancinelli et al, 2005), western Sicily (Todaro et al, 2017(Todaro et al, , 2018, Greece (Romano et al, 2008), and Turkey (Coskun Tunaboylu et al, 2014). The recovery of skeletal abundance to pre-extinction levels in shallow-marine environments across western Tethyan carbonate platforms occurred in upper Hettangian-Sinemurian limestones with an increase in skeletal contribution from protists and mollusks.…”

Section: I/ca Ratios Of Bulk Carbonate Samplesmentioning

confidence: 99%

Reduction in animal abundance and oxygen availability during and after the end‐Triassic mass extinction

Singh

et al. 2022

Geobiology

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The end-Triassic biodiversity crisis was one of the most severe mass extinctions in the history of animal life. However, the extent to which the loss of taxonomic diversity was coupled with a reduction in organismal abundance remains to be quantified. Further, the temporal relationship between organismal abundance and local marine redox conditions is lacking in carbonate sections. To address these questions, we measured skeletal grain abundance in shallow-marine limestones by point counting 293 thin sections from four stratigraphic sections across the Triassic/Jurassic boundary in the Lombardy Basin and Apennine Platform of western Tethys. Skeletal abundance decreased abruptly across the Triassic/Jurassic boundary in all stratigraphic sections. The abundance of skeletal organisms remained low throughout the lower-middle Hettangian strata and began to rebound during the late Hettangian and early Sinemurian. A two-way ANOVA indicates that sample age (p < .01, η 2 = 0.30) explains more of the variation in skeletal abundance than the depositional environment or paleobathymetry (p < .01, η 2 = 0.15). Measured I/Ca ratios, a proxy for local shallow-marine redox conditions, show this same pattern with the lowest I/Ca ratios occurring in the early Hettangian. The close correspondence between oceanic water column oxygen levels and skeletal abundance indicates a connection between redox conditions and benthic organismal abundance across the Triassic/Jurassic boundary. These findings indicate that the end-Triassic mass extinction reduced not only the biodiversity but also the carrying capacity for skeletal organisms in early Hettangian ecosystems, adding to evidence that mass extinction of species generally leads to mass rarity among survivors.

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