StratPal: An R package for creating stratigraphic paleobiology modelling pipelines

Methods in Ecology and Evolution, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

Abstract The fossil record is an important source of information to understand biological processes that take place over timescales not accessible human observation or experiments. Fossil data are a perfect reflection past change, but joint expression stratigraphic, ecological, evolutionary and taphonomic effects. Stratigraphic paleobiology field dedicated identifying these effects accounting for them. We present StratPal , R package in which modules can be combined into modelling pipelines stratigraphic paleobiology. describe the types modified transformed using this approach briefly discuss potential extensions. As working examples, we show how pipeline used model clustering last occurrences at hiatuses condensation surfaces, leading artefactual ‘extinction events’ caused by gaps.

Language: Английский

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Taphonomic and reworking processes isolating cephalopod septa and chamber fillings

Lethaia, Journal Year: 2025, Volume and Issue: 58(2), P. 1 - 18

Published: April 29, 2025

Language: Английский

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Morphometric analysis of the Late Cretaceous Placenticeras of Alabama, USA: sexual dimorphism, allometry, and implications for taxonomy

Paleobiology, Journal Year: 2024, Volume and Issue: 50(2), P. 239 - 270

Published: May 1, 2024

Abstract A traditional typological approach to taxonomy often does not adequately account for intraspecific variation and can result in taxonomic oversplitting. For many groups, including ammonoids of the Placenticeras genus, documented recent studies (e.g., ontogenetic changes, sexual dimorphism, polymorphism) challenges historic proliferation species names. Here, we used a population quantitatively evaluated morphometric sample Late Cretaceous (Santonian–Campanian) from Alabama adjacent counties. We linear mixed models (LMMs) characterize how morphological variables scale with conch size across sample, exploiting longitudinal data evaluate individual growth inform interpretations multivariate analyses. Extended LMMs incorporating geological formation changes through time. Principal component analysis clustering were then number distinct clusters that emerged morphospace independent previous taxon name assignments. Discontinuous scaling relationships space suggest dimorphism characterized by differences adult and, secondarily, shape. Previous Stantonoceras assignments broadly overlap our morphospace, failing justify this distinction (as dimorphs or as genera subgenera). morphology ornament placement changed time, suggesting potential utility coarse (stage-level) biostratigraphy. However, temporal associated fail support plethora reported As few one two (successive) may be present (representing 130 years collection effort). In addition highlighting need significant revision study demonstrates distinguishing between different sources variation, improving under taxonomy, maximizing amount information obtained nondestructively.

Language: Английский

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Exceptions to the temperature–size rule: no Lilliput Effect in end‐Permian ostracods (Crustacea) from Aras Valley (northwest Iran)

Palaeontology, Journal Year: 2023, Volume and Issue: 66(4)

Published: July 1, 2023

Abstract The body size of marine ectotherms is often negatively correlated with ambient water temperature, as seen in many clades during the hyperthermal crisis end‐Permian mass extinction ( c . 252 Ma). However, case ostracods, changes ancient events are rarely quantified. In this study, we evaluate ostracods Aras Valley section (northwest Iran) response to drastic warming at three taxonomic levels: class, order, species. At assemblage level, triggers a complete species turnover section, larger, newly emerging dominating immediate post‐extinction for short time. Individual ostracod and instars do not show dwarfing or change an adaptation temperature stress crisis. This may indicate that might have been exceptions temperature–size rule (TSR), using mechanism does involve decrease size. be similar accelerated development despite constant instar sizes can observed some recent experimental studies responses thermal stress.

Language: Английский

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Discriminating conodont recording bias: a case study from the Nanzhang-Yuan’an Lagerstätte

PeerJ, Journal Year: 2024, Volume and Issue: 12, P. e18011 - e18011

Published: Sept. 13, 2024

The Early Triassic Nanzhang-Yuan'an Lagerstätte of Hubei Province, South China, preserves abundant marine reptiles in the uppermost part Jialingjiang Formation and provides detailed insights into organisms, including newly discovered well preserved conodont clusters Family Ellisonidae. These elements allow us to assess bias introduced during acquisition process. We examined on bedding planes those acquired after acid-dissolving method analyze their attributes length distributions. identified a biased preservation different related morphologies. After procedures, increased, all were affected, with larger individuals being particularly prone destruction. Among them, P Ellisonidae least while S most affected. This study further indicates that paleobiological interpretations based fossil size or morphology could be obscured if influence post-mortem effect is ignored.

Language: Английский

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DEEP TIME BIOGEOMORPHOLOGY 2: ANIMALS AS ANCIENT ECOSYSTEM ENGINEERS

Palaios, Journal Year: 2022, Volume and Issue: 37(12), P. 701 - 702

Published: Dec. 29, 2022

Research Article| December 29, 2022 DEEP TIME BIOGEOMORPHOLOGY 2: ANIMALS AS ANCIENT ECOSYSTEM ENGINEERS ANTHONY P. SHILLITO; SHILLITO 1Department of Geological Sciences, University Saskatchewan, 114 Science Place, Campus Drive, Saskatoon SK S7N 5E2, Canada Search for other works by this author on: GSW Google Scholar NEIL S. DAVIES; DAVIES 2Department Earth Cambridge, Downing Street, Cambridge CB2 3EQ, UK WILLIAM J. MCMAHON; MCMAHON BEN SLATER 3Department Palaeobiology, Uppsala University, Geocentrum, Villav. 16, 75236 Uppsala, Sweden Author and Article Information email: [email protected] Publisher: SEPM Society Sedimentary Geology Received: 27 Oct Accepted: 01 Nov First Online: 29 Dec Online ISSN: 1938-5323 Print 0883-1351 Copyright © 2022, (Society Geology) PALAIOS (2022) 37 (12): 701–702. https://doi.org/10.2110/palo.2022.053 history Cite View This Citation Add to Manager Share Icon Facebook Twitter LinkedIn Email Permissions Site SHILLITO, DAVIES, MCMAHON, SLATER; ENGINEERS. 2022;; doi: Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Dropdown Menu input auto suggest filter your All ContentBy SocietyPALAIOS Advanced thematic set is the second a pair volumes delving into co-evolution life sedimentary environments in deep time. Whilst full gamut life-sediment interactions far too vast cover its entirety, across both provides examples how different organisms have interacted with entirety Phanerozoic. The first focused on plant-sediment from Carboniferous Pliocene (Davies et al. 2022), whereas has loose running theme ‘animals'; documenting between... You do not access content, please speak institutional administrator if you feel should access.

Language: Английский

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