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2021-02-18 - Colloque/Présentation - poster - Anglais - page(s)

Deridoux Amandine , Flammang Patrick , Gabriele Sylvain , "How does bioadhesion impact locomotion in the starfish Asterias rubens?" in 4th International Conference on Biological and Biomimetic Adhesives., Aveiro , Portugal, 2021

  • Codes CREF : Biologie (DI3100), Chimie (DI1300)
  • Unités de recherche UMONS : Biologie des Organismes Marins et Biomimétisme (S864), Laboratoire Interfaces et Fluides complexes (S885)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux), Institut des Biosciences (Biosciences)
  • Centres UMONS : Centre d’Innovation et de Recherche en Matériaux Polymères (CIRMAP)
Texte intégral :

Abstract(s) :

(Anglais) Starfishes use a multitude of small hydraulic organs (i.e., the tube feet or podia), to locomote, to attach strongly to the substrate, and to pry open the mussels on which they feed. Podia are secretory organs in which two types of adhesive cells co-secrete a blend of adhesive proteins to form the adhesive layer joining the tube foot to the substrate [1]. Despite the importance of podia in the sea star locomotion mechanism, the regulation of the number of podia sticking to a surface during movement is still poorly understood. In this study, we used an aquarium equipped with a total internal reflection (TIRF) system and developed a robust technique for quantifying the number of podia sticking to the substrate during locomotion. We found that the contact area of individual podia increases during the adhesion phase to become a perfect circle. Surprisingly, we measured a very low percentage of podia in contact with the substrate during locomotion in Asterias rubens. Although the number of sticking podia, as well as the instantaneous speed, remains constant during movement, this number increases proportionally with the size of starfish. In contrast, we found that the average speed of movement decreases with the increase in the specimen size. Based on these preliminary results, we plan to study the role of important environmental factors, such as substrate angle and temperature of the environment on starfish locomotion, and we will determine the adhesion energy exerted by a sea star according to the number of sticking podia. 1. P. Flammang, A. Michel, A. Van Cauwenberge, H. Alexandre and M. Jangoux, Journal of Experimental Biology, 201, 2383–2395 (1998).