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First published online May 1, 2009
Journal of Experimental Biology 212, 1449-1454 (2009)
Published by The Company of Biologists 2009
doi: 10.1242/jeb.025551
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Biomechanics of byssal threads outside the Mytilidae: Atrina rigida and Ctenoides mitis

Trevor Pearce1,* and Michael LaBarbera2

1 Committee on Evolutionary Biology, the University of Chicago, Chicago, IL 60637, USA
2 Department of Organismal Biology and Anatomy, the University of Chicago, Chicago, IL 60637, USA


Figure 1
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  		Fig. 1. Byssal thread stress–strain curves. A typical stress–strain curve was chosen for each species. Curves from a previous study have been included for comparison (Pearce and LaBarbera, 2009Go). Note that the Atrina rigida curve (yellow), like that of Modiolus modiolus (light blue), has two distinct yield points. The Ctenoides mitis curve (green) shows that these threads had extremely low strength and stiffness but were very extensible.

 

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  		Fig. 2. Double-yield behavior. These curves illustrate the double-yield behavior of A. rigida and M. modiolus threads. Each curve has two distinct yield points, each represented by a relatively sudden drop in stiffness (the slope of the curve). Following each yield point, the thread becomes stiffer prior to either once again yielding or failing.

 

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© The Company of Biologists Ltd 2009