Palaeoecological patterns of change in marine invertebrate faunas across the End-Triassic mass extinction event: Evidence from Larne, Northern Ireland

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dc.contributor.authorOpazo, L. Felipe
dc.contributor.authorPage, Kevin N.
dc.date.accessioned2025-01-20T22:03:27Z
dc.date.available2025-01-20T22:03:27Z
dc.date.issued2021
dc.description.abstractThe End-Triassic mass extinction event [ETE] (201.5 Ma) marks a drastic turnover and loss of >50% of marine biodiversity. Suggested environmental factors include extreme climate change and global carbon-cycle perturbations linked to Central Atlantic Magmatic Province (CAMP) volcanism. Considerable attention has been paid to disentangling the causes and selectivity of the ETE, whilst downplaying the patterns of change in the structure and functioning of marine paleofauna. Here we provide detailed quantitative information from across the Triassic-Jurassic boundary at Waterloo Bay, Lame, Northern Ireland, to describe patterns of changes in different palaeoecological parameters across the ETE. The analysis was based on abundance data of species sampled from approximately 1 m intervals through the sequence. Dominance and richness were estimated using rarefaction techniques and beta-diversity index, and distinctness diversity indices were calculated. Changes in species composition were evaluated by multivariate analysis (nMDS, ANOMSIM and SIMPER). Rank abundance models were fitted, and functional diversity were estimated based on an ecospace model, applied to each sampled unit to detect changes in structure and ecological complexity. Across the ETE three distinctive states were identified: the pre-extinction state (Westbury Formation), characterised by an assemblage with high species richness and ecological redundancy, and with low taxonomic variation and functional diversity. The extinction state (Cotham and Langport members) represents a shift of the marine ecosystem, where >70% marine species disappears decreasing the ecosystems functioning the marine ecosystem around 80%. The recovery state (Lias Group), commencing some similar to 150 ky after the extinction, with ecologically complex assemblages as new taxa colonised, increasing variation in taxonomic distinctness and new contributing ecological traits and functional richness through the Hettangian. The palaeoecological patterns described here are robust enough to discount possible fades effects, but more important, is consistent with other studies reported globally, and demonstrates that the ecological signals detected in this study are real. (C) 2021 The Geologists' Association. Published by Elsevier Ltd. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.pgeola.2021.06.004
dc.identifier.issn0016-7878
dc.identifier.urihttps://doi.org/10.1016/j.pgeola.2021.06.004
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94043
dc.identifier.wosidWOS:000729439300008
dc.issue.numero6
dc.language.isoen
dc.pagina.final742
dc.pagina.inicio726
dc.revistaProceedings of the geologists association
dc.rightsacceso restringido
dc.subjectThe End-Triassic mass extinction event
dc.subjectPalaeoecology
dc.subjectEcological turnover
dc.subjectTriassic-Jurassic boundary
dc.subjectBiodiversity crisis
dc.subjectMarine benthic fauna
dc.subject.ods15 Life on Land
dc.subject.ods13 Climate Action
dc.subject.ods14 Life Below Water
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa13 Acción por el clima
dc.subject.odspa14 Vida submarina
dc.titlePalaeoecological patterns of change in marine invertebrate faunas across the End-Triassic mass extinction event: Evidence from Larne, Northern Ireland
dc.typeartículo
dc.volumen132
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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