First glimpse into Lower Jurassic deep-sea biodiversity: in situ diversification and resilience against extinction

B. Thuy, S. Kiel, A. Dulai, A. S. Gale, A. Kroh, A. R. Lord, L. D. Numberger-Thuy, S. Stohr, M. Wisshak

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    Abstract

    Owing to the assumed lack of deep-sea macrofossils older than the Late Cretaceous, very little is known about the geological history of deep-sea communities, and most inference-based hypotheses argue for repeated recolonizations of the deep sea from shelf habitats following major palaeoceanographic perturbations. We present a fossil deep-sea assemblage of echinoderms, gastropods, brachiopods and ostracods, from the Early Jurassic of the Glasenbach Gorge, Austria, which includes the oldest known representatives of a number of extant deep-sea groups, and thus implies that in situ diversification, in contrast to immigration from shelf habitats, played a much greater role in shaping modern deep-sea biodiversity than previously thought. A comparison with coeval shelf assemblages reveals that, at least in some of the analysed groups, significantly more extant families/superfamilies have endured in the deep sea since the Early Jurassic than in the shelf seas, which suggests that deep-sea biota are more resilient against extinction than shallow-water ones. In addition, a number of extant deep-sea families/superfamilies found in the Glasenbach assemblage lack post-Jurassic shelf occurrences, implying that if there was a complete extinction of the deep-sea fauna followed by replacement from the shelf, it must have happened before the Late Jurassic.
    Original languageEnglish
    Article number20132624
    JournalProceedings of the Royal Society B: Biological Sciences
    Volume281
    Issue number1786
    Early online date21 May 2014
    DOIs
    Publication statusPublished - 21 May 2014

    Keywords

    • evolution of deep-sea biota
    • onshore-offshore patterns
    • in situ diversification
    • resilience against extinction

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