Ammonite paleobiogeography during the Pliensbachian–Toarcian crisis (Early Jurassic) reflecting paleoclimate, eustasy, and extinctions
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| Title: | Ammonite paleobiogeography during the Pliensbachian–Toarcian crisis (Early Jurassic) reflecting paleoclimate, eustasy, and extinctions |
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| Authors: | Dera, Guillaume1,2 guillaume.dera@lsce.ipsl.fr, Neige, Pascal1 pascal.neige@u-bourgogne.fr, Dommergues, Jean-Louis1 jean-louis.dommergues@u-bourgogne.fr, Brayard, Arnaud1 arnaud.brayard@u-bourgogne.fr |
| Source: | Global & Planetary Change. Aug2011, Vol. 78 Issue 3/4, p92-105. 14p. |
| Subjects: | Paleobiogeography, Jurassic stratigraphic geology, Ammonoidea, Paleoclimatology, Mass extinctions, Ecological disturbances, Paleoecology, Global warming, Biotic communities |
| Abstract: | Abstract: The Pliensbachian–Toarcian crisis (Early Jurassic) is one of the major Mesozoic paleoecological disturbances when ca. 20% of marine and continental families went extinct. Contemporaneously, profound paleobiogeographical changes occurred in most oceanic domains including a disruption of ammonite provincialism during the Early Toarcian. Here, we quantitatively reappraise the structure and evolution of paleobiogeographical patterns displayed by ammonite faunas before, during, and after the biological crisis, over a time-interval including 13 biochronozones. The high-resolution study presented here involves the use of hierarchical Cluster Analyses, non-metric Multi-Dimensional Scaling methods, and Bootstrap Spanning Network approaches that we apply to a large database including 772 ammonite species from 16 northwestern Tethyan and Arctic basins. Our results confirm a robust faunal dichotomy between Euro-Boreal and Mediterranean areas throughout the Pliensbachian, with the first emergence of an Arctic biome during the cooling regressive event of the Spinatum Zone. Whatever its complexity, Pliensbachian provincialism could be directly linked to paleogeographical barriers and to latitudinal paleoclimatic and paleoecological contrasts. During the Early Toarcian, this pattern was progressively lost, with northward expansions of Mediterranean ammonites during the Tenuicostatum Zone, followed by a strong interprovincial mixing during the Falciferum Zone. This faunal homogenization results from the combination of several parameters including a major sea-level rise facilitating basinal connections, a global warming event stretching the spatial range limits of southern taxa, and a mass extinction preferentially removing endemic species. Ammonite provincialism, although slightly different, was progressively re-established during the cooling regressive trend of the Middle Toarcian. These results therefore suggest a paramount influence of paleoclimatic, eustatic, and extinction constraints on the paleobiogeography of Early Jurassic ammonites, even if some threshold effects or independent biological factors may sporadically complicate the patterns. [Copyright &y& Elsevier] |
| Copyright of Global & Planetary Change is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 65045577 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Ammonite paleobiogeography during the Pliensbachian–Toarcian crisis (Early Jurassic) reflecting paleoclimate, eustasy, and extinctions – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Dera%2C+Guillaume%22">Dera, Guillaume</searchLink><relatesTo>1,2</relatesTo><i> guillaume.dera@lsce.ipsl.fr</i><br /><searchLink fieldCode="AR" term="%22Neige%2C+Pascal%22">Neige, Pascal</searchLink><relatesTo>1</relatesTo><i> pascal.neige@u-bourgogne.fr</i><br /><searchLink fieldCode="AR" term="%22Dommergues%2C+Jean-Louis%22">Dommergues, Jean-Louis</searchLink><relatesTo>1</relatesTo><i> jean-louis.dommergues@u-bourgogne.fr</i><br /><searchLink fieldCode="AR" term="%22Brayard%2C+Arnaud%22">Brayard, Arnaud</searchLink><relatesTo>1</relatesTo><i> arnaud.brayard@u-bourgogne.fr</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Global+%26+Planetary+Change%22">Global & Planetary Change</searchLink>. Aug2011, Vol. 78 Issue 3/4, p92-105. 14p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Paleobiogeography%22">Paleobiogeography</searchLink><br /><searchLink fieldCode="DE" term="%22Jurassic+stratigraphic+geology%22">Jurassic stratigraphic geology</searchLink><br /><searchLink fieldCode="DE" term="%22Ammonoidea%22">Ammonoidea</searchLink><br /><searchLink fieldCode="DE" term="%22Paleoclimatology%22">Paleoclimatology</searchLink><br /><searchLink fieldCode="DE" term="%22Mass+extinctions%22">Mass extinctions</searchLink><br /><searchLink fieldCode="DE" term="%22Ecological+disturbances%22">Ecological disturbances</searchLink><br /><searchLink fieldCode="DE" term="%22Paleoecology%22">Paleoecology</searchLink><br /><searchLink fieldCode="DE" term="%22Global+warming%22">Global warming</searchLink><br /><searchLink fieldCode="DE" term="%22Biotic+communities%22">Biotic communities</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: The Pliensbachian–Toarcian crisis (Early Jurassic) is one of the major Mesozoic paleoecological disturbances when ca. 20% of marine and continental families went extinct. Contemporaneously, profound paleobiogeographical changes occurred in most oceanic domains including a disruption of ammonite provincialism during the Early Toarcian. Here, we quantitatively reappraise the structure and evolution of paleobiogeographical patterns displayed by ammonite faunas before, during, and after the biological crisis, over a time-interval including 13 biochronozones. The high-resolution study presented here involves the use of hierarchical Cluster Analyses, non-metric Multi-Dimensional Scaling methods, and Bootstrap Spanning Network approaches that we apply to a large database including 772 ammonite species from 16 northwestern Tethyan and Arctic basins. Our results confirm a robust faunal dichotomy between Euro-Boreal and Mediterranean areas throughout the Pliensbachian, with the first emergence of an Arctic biome during the cooling regressive event of the Spinatum Zone. Whatever its complexity, Pliensbachian provincialism could be directly linked to paleogeographical barriers and to latitudinal paleoclimatic and paleoecological contrasts. During the Early Toarcian, this pattern was progressively lost, with northward expansions of Mediterranean ammonites during the Tenuicostatum Zone, followed by a strong interprovincial mixing during the Falciferum Zone. This faunal homogenization results from the combination of several parameters including a major sea-level rise facilitating basinal connections, a global warming event stretching the spatial range limits of southern taxa, and a mass extinction preferentially removing endemic species. Ammonite provincialism, although slightly different, was progressively re-established during the cooling regressive trend of the Middle Toarcian. These results therefore suggest a paramount influence of paleoclimatic, eustatic, and extinction constraints on the paleobiogeography of Early Jurassic ammonites, even if some threshold effects or independent biological factors may sporadically complicate the patterns. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Global & Planetary Change is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.gloplacha.2011.05.009 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 92 Subjects: – SubjectFull: Paleobiogeography Type: general – SubjectFull: Jurassic stratigraphic geology Type: general – SubjectFull: Ammonoidea Type: general – SubjectFull: Paleoclimatology Type: general – SubjectFull: Mass extinctions Type: general – SubjectFull: Ecological disturbances Type: general – SubjectFull: Paleoecology Type: general – SubjectFull: Global warming Type: general – SubjectFull: Biotic communities Type: general Titles: – TitleFull: Ammonite paleobiogeography during the Pliensbachian–Toarcian crisis (Early Jurassic) reflecting paleoclimate, eustasy, and extinctions Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Dera, Guillaume – PersonEntity: Name: NameFull: Neige, Pascal – PersonEntity: Name: NameFull: Dommergues, Jean-Louis – PersonEntity: Name: NameFull: Brayard, Arnaud IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2011 Type: published Y: 2011 Identifiers: – Type: issn-print Value: 09218181 Numbering: – Type: volume Value: 78 – Type: issue Value: 3/4 Titles: – TitleFull: Global & Planetary Change Type: main |
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