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

نویسندگان

  • Ben Thuy
  • Steffen Kiel
  • Alfréd Dulai
  • Andy S Gale
  • Andreas Kroh
  • Alan R Lord
  • Lea D Numberger-Thuy
  • Sabine Stöhr
  • Max Wisshak
چکیده

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.

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عنوان ژورنال:
  • Proceedings. Biological sciences

دوره 281 1786  شماره 

صفحات  -

تاریخ انتشار 2014