Mechanical sensitivity and the dynamics of evolutionary rate shifts in biomechanical systems.
The influence of biophysical relationships on rates of morphological evolution is a cornerstone of evolutionary theory. Mechanical sensitivity-the correlation strength between mechanical output and the system's underlying morphological components-is thought to impact the evolutionary dynamics of form-function relationships, yet has rarely been examined. Here, we compare the evolutionary rates of the mechanical components of the four-bar linkage system in the raptorial appendage of mantis shrimp (Order Stomatopoda). This system's mechanical output (kinematic transmission (KT)) is highly sensitive to variation in its output link, and less sensitive to its input and coupler links. We found that differential mechanical sensitivity is associated with variation in evolutionary rate: KT and the output link exhibit faster rates of evolution than the input and coupler links to which KT is less sensitive. Furthermore, for KT and, to a lesser extent, the output link, rates of evolution were faster in 'spearing' stomatopods than 'smashers', indicating that mechanical sensitivity may influence trait-dependent diversification. Our results suggest that mechanical sensitivity can impact morphological evolution and guide the process of phenotypic diversification. The connection between mechanical sensitivity and evolutionary rates provides a window into the interaction between physical rules and the evolutionary dynamics of morphological diversification.
Duke Scholars
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Related Subject Headings
- Crustacea
- Biomechanical Phenomena
- Biological Evolution
- Animals
- Animal Structures
- 41 Environmental sciences
- 31 Biological sciences
- 30 Agricultural, veterinary and food sciences
- 11 Medical and Health Sciences
- 07 Agricultural and Veterinary Sciences
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Crustacea
- Biomechanical Phenomena
- Biological Evolution
- Animals
- Animal Structures
- 41 Environmental sciences
- 31 Biological sciences
- 30 Agricultural, veterinary and food sciences
- 11 Medical and Health Sciences
- 07 Agricultural and Veterinary Sciences