Mechanical adaptation of brachiopod shells via hydration-induced structural changes.


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Article
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Authors
Ihli, Johannes 
Schenk, Anna S 
Rosenfeldt, Sabine 
Abstract

The function-optimized properties of biominerals arise from the hierarchical organization of primary building blocks. Alteration of properties in response to environmental stresses generally involves time-intensive processes of resorption and reprecipitation of mineral in the underlying organic scaffold. Here, we report that the load-bearing shells of the brachiopod Discinisca tenuis are an exception to this process. These shells can dynamically modulate their mechanical properties in response to a change in environment, switching from hard and stiff when dry to malleable when hydrated within minutes. Using ptychographic X-ray tomography, electron microscopy and spectroscopy, we describe their hierarchical structure and composition as a function of hydration to understand the structural motifs that generate this adaptability. Key is a complementary set of structural modifications, starting with the swelling of an organic matrix on the micron level via nanocrystal reorganization and ending in an intercalation process on the molecular level in response to hydration.

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Keywords
Adaptation, Physiological, Animal Shells, Animals, Invertebrates, Microscopy, Electron, Organism Hydration Status
Journal Title
Nat Commun
Conference Name
Journal ISSN
2041-1723
2041-1723
Volume Title
12
Publisher
Springer Science and Business Media LLC