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Ostracods had colonized estuaries by the late Silurian

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posted on 2022-12-22, 11:27 authored by Anna McGairy, Toshifumi Komatsu, Mark Williams, Thomas HP Harvey, C Giles Miller, Phong Duc Nguyen, Julien Legrand, Toshihiro Yamada, David J Siveter, Harrison Bush, Christopher P Stocker
The fossil record of terrestrialization documents notable shifts in the environmental and physiological tolerances of many animal and plant groups. However, for certain significant components of modern freshwater and terrestrial environments, the transition out of marine settings remains largely unconstrained. Ostracod crustaceans occupy an exceptional range of modern aquatic environments and are invaluable palaeoenvironmental indicators in the fossil record. However, pre-Carboniferous records of supposed non-marine and marginal marine ostracods are sparse, and the timing of their marine to non-marine transition has proven elusive. Here, we reassess the early environmental history of ostracods in light of new assemblages from the late Silurian of Vietnam. Two, low diversity but distinct ostracod assemblages are associated with estuarine deposits. This occurrence is consistent with previous incidental reports of ostracods occupying marginal and brackish settings through the late Silurian and Devonian. Therefore, ostracods were pioneering the occupation of marginal marine and estuarine settings 60 Myr before the Carboniferous and they were a component of the early phase of transition from marine to non-marine environments.

Funding

Natural Environment Research Council (grant no. NE/S007350/1), Central England NERC Training Alliance (CENTA) PhD studentship to A.M.; Vietnamese project ‘Stratigraphical research for the Devonian sedimentary rocks in the north-northwest of the Song Hien structure' (grant no. TNMT.2018.03.05 to P.D.N.) and ‘Phanerozoic stratigraphy in the eastern Viet Bac (including Ha Giang, Cao Bang, Bac Kȧn, Thai Nguyen and Lȧng Son provinces) and related mineral resources’ (grant no. NVTX.2021.03.03 to P.D.N.), Grants-in-Aid for Scientific Research (KAKENHI) from the Japan Society for the Promotion of Science (16K05593, 19K04059 to T.K.; 18H02495 to T.Y.); Leverhulme Research Fellowship (‘The early Palaeozoic evolution of Vietnam', RF-2018-275/4 to M.W.).

History

Citation

McGairy A et al. 2021. Ostracods had colonized estuaries by the late Silurian. Biol. Lett. 17: 20210403. https://doi.org/10.1098/rsbl.2021.0403

Author affiliation

School of Geography, Geology and the Environment

Version

  • VoR (Version of Record)

Published in

Biology Letters

Volume

17

Issue

12

Pagination

20210403

Publisher

The Royal Society

eissn

1744-957X

Acceptance date

2021-11-01

Copyright date

2021

Available date

2021-12-01

Language

en

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