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Morphology and tenacity of the tube foot disc of three common European sea urchin species: a comparative study
Santos, R.; Flammang, P. (2006). Morphology and tenacity of the tube foot disc of three common European sea urchin species: a comparative study. Biofouling (Print) 22(3): 187-200. dx.doi.org/10.1080/08927010600743449
In: Biofouling. Taylor & Francis: Chur; New York. ISSN 0892-7014, more
Peer reviewed article  

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Keywords
    Arbacia Gray, 1835 [WoRMS]; Paracentrotus Mortensen, 1903 [WoRMS]; Sphaerechinus Desor, 1856 [WoRMS]; Marine
Author keywords
    Arbacia; Paracentrotus; Sphaerechinus; adhesion; cohesion; secretory

Authors  Top 
  • Santos, R.
  • Flammang, P., more

Abstract
    The variation in tenacity of single tube feet from three sea urchin species with contrasted habitats was assessed and correlated with the ultrastructure of their adhesive secretory granules. The tube feet of Arbacia lixula and Sphaerechinus granularis have larger discs and more complex adhesive granules than those of Paracentrotus lividus , but A. lixula attaches to glass with significantly lower tenacity (0.05 - 0.09 MPa) than the other two species (0.10 - 0.20 and 0.11 - 0.29 MPa, respectively). However, the estimated maximal attachment force one tube foot can produce is similar for all three species investigated. No clear relationship between tube foot size, tenacity, adhesive secretory granule ultrastructure and species habitat can therefore be established. For P. lividus the tenacity of single tube foot discs on four different smooth substrata was also compared, which showed that both the total surface energy and the ratio of polar to non-polar forces at the surface influence tube foot attachment strength. This influence of the surface characteristics of the substratum appears to affect the cohesiveness of the adhesive secretion more than its adhesiveness.

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