Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/30494
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Brachiopod shell thickness links environment and evolution
Author(s): Balthasar, Uwe
Jin, Jisuo
Hints, Linda
Cusack, Maggie
Contact Email: maggie.cusack@stir.ac.uk
Keywords: brachiopod
Ordovician
Silurian
mass extinction
Great Ordovician Biodiversification Event
shell thickness
Issue Date: 15-Oct-2019
Citation: Balthasar U, Jin J, Hints L & Cusack M (2019) Brachiopod shell thickness links environment and evolution. Palaeontology. https://doi.org/10.1111/pala.12450
Abstract: While it is well established that the shapes and sizes of shells are strongly phylogenetically controlled, little is known about the phylogenetic constraints on shell thickness. Yet, shell thickness is likely to be sensitive to environmental fluctuations and has the potential to illuminate environmental perturbations through deep time. Here we systematically quantify the thickness of the anterior brachiopod shell which protects the filtration chamber and is thus considered functionally homologous across higher taxa of brachiopods. Our data come from 66 genera and 10 different orders and shows well‐defined upper and lower boundaries of anterior shell thickness. For Ordovician and Silurian brachiopods we find significant order‐level differences and a trend of increasing shell thickness with water depth. Modern (Cenozoic) brachiopods, by comparison, fall into the lower half of observed shell thicknesses. Among Ordovician–Silurian brachiopods, older stocks commonly have thicker shells, and thick‐shelled taxa contributed more prominently to the Great Ordovician Biodiversification but suffered more severely during the Late Ordovician Mass Extinction. Our data highlight a significant reduction in maximum and minimum shell thickness following the Late Ordovician mass extinction. This points towards stronger selection pressure for energy‐efficient shell secretion during times of crisis.
DOI Link: 10.1111/pala.12450
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Notes: Output Status: Forthcoming/Available Online

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