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2013-08-22 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Caulier Guillaume , Flammang Patrick , Gerbaux Pascal , Eeckhaut Igor , "Comparison of the chemical communication allowing host selection in two marine symbioses which associate crustaceans with echinoderms" in International Chemical Ecology Conference, Melbourne , Australia, 2013

  • Codes CREF : Ecologie chimique (DI312G)
  • Unités de recherche UMONS : Biologie des Organismes Marins et Biomimétisme (S864)
  • Instituts UMONS : Institut des Biosciences (Biosciences)
  • Centres UMONS : Centre Interdisciplinaire de Spectrométrie de Masse (CISMA)

Abstract(s) :

(Anglais) Symbiosis is defined as a sustainable interspecific relationship between two organisms from different species. Communication is needed to insure symbionts recognition and the longevity of the association. Most of the time, interaction between host and symbionts is allowed through the production and the detection of natural secondary metabolites. Two different crustacean-echinoderm symbiosis models were investigated in this study: the harlequin crabs Lissocarcinus orbicularis and the snapping shrimp Synalpheus stimpsoni, two ectocommensals found, respectively, on the body wall of different species of holothuroids and crinoids. Thanks to a multidisciplinary approach (behavioral, chemical and morphological characterization), we highlighted (i) the chemical origin of kairomones allowing the recognition between symbionts and their hosts, (ii) the minimal quantity of secondary metabolites needed to stimulate symbiont chemotaxy, (iii) the chemosensory organs involved in this recognition, and (iv) the morphology of these organs by electron microscopy. A comparison is made to show similarities and divergences between the two studied models. While L. orbicularis is only attracted by the saponins produced by its sea cucumber host, S. stimpsoni is attracted by potential quinones produced by host and non-host crinoid species. Shrimps are no longer attracted by their host when their antennules are removed while crabs are still able to detect sea cucumbers without antennae and antennules. Moreover, crabs need a higher concentration to realize chemotaxy. The differences existing between crabs and shrimps are finally discussed taking ecological factors in consideration (e.g. host size, ecological niche, symbionts motion behaviors…).