Actualités

Toute l'actualité du regroupement, les bons coups des chercheurs et des étudiants, les événements et les annonces.

Publication d’un article pour Zeineb Bouhlel  

Zeineb Bouhlel, Doctorat, ISMER

Supervision : Réjean Tremblay (ISMER), Isabelle Marcotte (UQAM)

 

Voici le titre et le résumé de l’article publié par Zeineb Bouhlel dans Journal of Experimental Biology :

 

Interspecies comparison of the mechanical properties and biochemical composition of byssal threads

Zeineb Bouhlel, Bertrand Genard, Neilly Ibrahim, Emily Carrington, José M. F. Babarro, Aynur Lok, Augusto A. V. Flores, Christian Pellerin, Réjean Tremblay, Isabelle Marcotte

Journal of Experimental Biology (2017) 220: 984-994; doi: 10.1242/jeb.141440

 

Several bivalve species produce byssus threads to provide attachment to substrates, with mechanical properties highly variable among species. Here, we examined the distal section of byssal threads produced by a range of bivalve species (Mytilus edulis, Mytilus trossulus, Mytilus galloprovincialis, Mytilus californianus, Pinna nobilis, Perna perna, Xenostrobus securis, Brachidontes solisianus and Isognomon bicolor) collected from different nearshore environments. Morphological and mechanical properties were measured, and biochemical analyses were performed. Multivariate redundancy analyses on mechanical properties revealed that byssal threads of M. californianus, M. galloprovincialis and P. nobilis have very distinct mechanical behaviours compared with the remaining species. Extensibility, strength and force were the main variables separating these species groups, which were highest for M. californianus and lowest for P. nobilis. Furthermore, the analysis of the amino acid composition revealed that I. bicolor and P. nobilis threads are significantly different from the other species, suggesting a different underlying structural strategy. Determination of metal contents showed that the individual concentration of inorganic elements varies, but that the dominant elements are conserved between species. Altogether, this bivalve species comparison suggests some molecular bases for the biomechanical characteristics of byssal fibres that may reflect phylogenetic limitations.