Title
Mechanoreceptor distribution in stag beetle jaws corresponds to the material stress in fightsMechanoreceptor distribution in stag beetle jaws corresponds to the material stress in fights
Author
Faculty/Department
Faculty of Sciences. Biology
Faculty of Sciences. Physics
Research group
Functional Morphology
Biophysics and Biomedical Physics
Publication type
article
Publication
Amsterdam,
Subject
Biology
Source (journal)
Arthropod structure & development. - Amsterdam
Volume/pages
44(2015):3, p. 201-208
ISSN
1467-8039
ISI
000356550500001
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Male stag beetles (Lucanidae) use their extremely elongated jaws to pinch their rivals forcefully in malemale battles. The morphology of these jaws has to be a compromise between robustness (to withstand the bite forces), length and weight. Cyclommatus metallifer stag beetles circumvent this trade-off by reducing their bite force when biting with their slender jaw tips. Here we describe the functional mechanism behind the force modulation behaviour. Scanning Electron Microscopy and micro CT imaging show large numbers of small sensors in the jaw cuticle. We find a strong correlation between the distribution of these sensors and that of the material stress in the same jaw region during biting. The jaw sensors are mechanoreceptors with a small protrusion that barely protrudes above the undulating jaw surface. The sensors stimulate dendrites that extend from the neuronal cell body through the entire thickness of the jaw exoskeleton towards the sensors at the external surface. They form a sensory field that functions in a feedback mechanism to control the bite muscle force. This negative feedback mechanism enabled the stag beetles to evolve massive bite muscles without risking overloading their valuable jaws.
E-info
https://repository.uantwerpen.be/docman/iruaauth/74a3fb/3e9982e4bb6.pdf
Full text (open access)
https://repository.uantwerpen.be/docman/irua/5cc696/10232.pdf
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