Warm afterglow from the Toarcian Oceanic Anoxic Event drives the success of deep-adapted brachiopods

Many aspects of the supposed hyperthermal Toarcian Oceanic Anoxic Event (T-OAE, Early Jurassic, c. 182 Ma) are well understood but a lack of robust palaeotemperature data severely limits reconstruction of the processes that drove the T-OAE and associated environmental and biotic changes. New oxygen...

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Bibliographic Details
Published in:Scientific reports 2020-04, Vol.10 (1), p.6549-6549, Article 6549
Main Authors: Ullmann, C. V., Boyle, R., Duarte, L. V., Hesselbo, S. P., Kasemann, S. A., Klein, T., Lenton, T. M., Piazza,  V., Aberhan, M.
Format: Article
Language:English
Subjects:
704/106/2738
704/106/413
704/47/4113
Adaptation, Physiological
Animals
Anoxia
Benthic fauna
Bottom water
Calcite
Carbon Cycle
Carbon Isotopes
Deep sea
Geography
Humanities and Social Sciences
Hypoxia - physiopathology
Invertebrates - physiology
Invertebrates - ultrastructure
Isotopes
Jurassic
Metabolic rate
Metabolism
Models, Theoretical
multidisciplinary
Oceans and Seas
Oxygen Isotopes
Paleoceanography
Paleontology
Science
Science (multidisciplinary)
Temperature
Water temperature
Weathering
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Summary:Many aspects of the supposed hyperthermal Toarcian Oceanic Anoxic Event (T-OAE, Early Jurassic, c. 182 Ma) are well understood but a lack of robust palaeotemperature data severely limits reconstruction of the processes that drove the T-OAE and associated environmental and biotic changes. New oxygen isotope data from calcite shells of the benthic fauna suggest that bottom water temperatures in the western Tethys were elevated by c. 3.5 °C through the entire T-OAE. Modelling supports the idea that widespread marine anoxia was induced by a greenhouse-driven weathering pulse, and is compatible with the OAE duration being extended by limitation of the global silicate weathering flux. In the western Tethys Ocean, the later part of the T-OAE is characterized by abundant occurrences of the brachiopod Soaresirhynchia , which exhibits characteristics of slow-growing, deep sea brachiopods. The unlikely success of Soaresirhynchia in a hyperthermal event is attributed here to low metabolic rate, which put it at an advantage over other species from shallow epicontinental environments with higher metabolic demand.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-63487-6