| Titre | The invasion of the land in deep time: integrating Paleozoic records of paleobiology, ichnology, sedimentology, and geomorphology |
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| Auteur | Buatois, L A; Davies, N S; Gibling, M R; Krapovickas, V; Labandeira, C C; MacNaughton, R B ; Mángano, M G; Minter, N J; Shillito, A P |
| Source | Integrative and Comparative Biology vol. 62, issue 2, 2022 p. 297-331, https://doi.org/10.1093/icb/icac059 |
| Image |  |
| Année | 2022 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20220240 |
| Éditeur | Oxford University Press |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1093/icb/icac059 |
| Media | papier; numérique; en ligne |
| Formats | pdf |
| Sujets | paléobiologie; ichnologie; Géomorphologie; Sciences et technologie; Nature et environnement; sédimentologie; géophysique; Paléozoïque |
| Illustrations | photographies; diagrammes |
| Diffusé | 2022 05 31 |
| Résumé | (disponible en anglais seulement)
The invasion of the land was a complex, protracted process, punctuated by mass extinctions, that involved multiple routes from marine environments. We integrate
paleobiology, ichnology, sedimentology, and geomorphology to reconstruct Paleozoic terrestrialization. Cambrian landscapes were dominated by laterally mobile rivers with unstable banks in the absence of significant vegetation. Temporary incursions by
arthropods and worm-like organisms into coastal environments apparently did not result in establishment of continental communities. Contemporaneous lacustrine faunas may have been inhibited by limited nutrient delivery and high sediment loads. The
Ordovician appearance of early land plants triggered a shift in the primary locus of the global clay mineral factory, increasing the amount of mudrock on the continents. The Silurian-Devonian rise of vascular land plants, including the first forests
and extensive root systems, was instrumental in further retaining fine sediment on alluvial plains. These innovations led to increased architectural complexity of braided and meandering rivers. Landscape changes were synchronous with establishment of
freshwater and terrestrial arthropod faunas in overbank areas, abandoned fluvial channels, lake margins, ephemeral lakes, and inland deserts. Silurian-Devonian lakes experienced improved nutrient availability, due to increased phosphate weathering
and terrestrial humic matter. All these changes favoured frequent invasions to permament establishment of jawless and jawed fishes in freshwater habitats and the subsequent tetrapod colonization of the land. The Carboniferous saw rapid
diversification of tetrapods, mostly linked to aquatic reproduction, and land plants, including gymnosperms. Deeper root systems promoted further riverbank stabilization, contributing to the rise of anabranching rivers and braided systems with
vegetated islands. New lineages of aquatic insects developed and expanded novel feeding modes, including herbivory. Late Paleozoic soils commonly contain pervasive root and millipede traces. Lacustrine animal communities diversified, accompanied by
increased food-web complexity and improved food delivery which may have favored permanent colonization of offshore and deep-water lake environments. These trends continued in the Permian, but progressive aridification favored formation of hypersaline
lakes, which were stressful for colonization. The Capitanian and end-Permian extinctions affected lacustrine and fluvial biotas, particularly the invertebrate infauna, although burrowing may have allowed some tetrapods to survive associated global
warming and increased aridification. |
| Sommaire | (Résumé en langage clair et simple, non publié)
La vie sur Terre est née dans les océans, mais s'est finalement déplacée vers des environnements d'eau douce et de terres subaériens. Ce fut un
processus long et complexe, impliquant plusieurs types d'êtres vivants. La plupart des étapes du processus ont eu lieu pendant l'ère paléozoïque (il y a 538 à 252 millions d'années). Cet article compile et analyse les preuves de plusieurs disciplines
des sciences de la terre pour produire une reconstruction détaillée de «l'invasion de la terre» paléozoïque par des organismes vivants. À la fin du Paléozoïque, les animaux vivaient dans presque tous les environnements non marins et l'évolution des
plantes terrestres avait fondamentalement modifié le caractère d'une grande partie des dépôts de sédiments non marins, en particulier en ce qui concerne les rivières. |
| GEOSCAN ID | 330613 |
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