Journal
JOURNAL OF THE GEOLOGICAL SOCIETY
Volume 179, Issue 1, Pages -Publisher
GEOLOGICAL SOC PUBL HOUSE
DOI: 10.1144/jgs2021-039
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Funding
- Research Council of Lithuania grant [S-MIP-19-15]
- Estonian Science Agency [PRG836]
- Estonian Ministry of Education and Research
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The Mulde event during the Silurian period was identified through fossil records and stable carbon isotopic data, with ostracods playing a significant role in understanding this global geobiological event. Analysis showed that the Mulde/lundgreni event had a negligible effect on the increasing alpha diversity trend during the Mid- to Upper Wenlock.
The Mulde event was one of several significant turnover events during the Silurian. This event is mostly recognized in the fossil record of graptolites and conodonts, as well as stable carbon isotopic data. Therefore, the ostracods - a significant part of the benthos - comprise a new and important dimension in understanding this global geobiological episode. Here, a new ostracod and delta 13C high-resolution record from the upper Wenlock interval from a Geluva-118 core (central Lithuania) are presented. Analyses revealed that the Mulde/lundgreni event had a negligible effect on the increasing alpha diversity trend during the Mid- to Upper Wenlock. A stratigraphically constrained time series analysis of ostracod palaeocommunities revealed the presence of six temporally distinct compositional states/assemblages consistent with the Milankovitch scale (presumably eccentricity) fourth- and fifth-order sea level fluctuations. An analysis of ostracod recurrence plots revealed a sudden disruption during the Mulde/lundgreni event and a hierarchical pattern of intercalating compositionally stable states, a pattern expected under the 'sloshing bucket' hypothesis of community change. A recurrence quantification analysis of subdominant species revealed that, in the aftermath of the Mulde event, there was a sudden transition to compositionally more stable communities, suggesting a strong ecosystem-level effect from this oceanic perturbation. Supplementary material: Ostracod abundance and isotopic data are available at
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