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2010-12-16 - Colloque/Présentation - poster - Anglais - 1 page(s)

Sheridan Christopher, Eeckhaut Igor , "The role of Scarus ghobban and Diadema Savignyi as potential vectors of coral pathogens on the reefs of SW Madagascar" in Euro ISRS Symposium , Wageningen, Pays-Bas, 2010

  • Codes CREF : Ecologie [animale] (DI312C), Biologie moléculaire (DI3111), Microbiologie et protistologie [bacteriol.,virolog.,mycolog.] (DI3130)
  • Unités de recherche UMONS : Biologie des Organismes Marins et Biomimétisme (S864)
Texte intégral :

Abstract(s) :

(Anglais) Several animal vectors of coral pathogens have been identified on coral reefs worldwide. Corallivory (consumption of live corals) in particular, seems to be an important transmission pathway for vector-borne pathogens. Parrotfish corallivory is a phenomenon observed overall on tropical coral reefs, and results in obvious lesions on corals. Though their role as corallivores is much less famous, sea urchins do also occasionally consume live coral. Considering that their density on coral reefs can sometimes be very high, they could potentially play an important role as corallivores. In this study, the role of these organisms as potential vectors of coral pathogens was investigated through characterization of the bacterial populations associated with their jaws, and comparison to those associated with both diseased (white syndrome) and healthy tissues of Echinopora hirsutissima, and the surrounding water. Molecular (DGGE, sequencing) analyses of these samples revealed the presence of potentially pathogenic bacteria in all sample types. This suggests that, although parrotfish and sea urchins could play a role as vectors of potential bacterial pathogens, these bacteria seem to be ubiquitous in the marine environment. Consequently, disease development following parrotfish or sea urchin corallivory could potentially result from a transfer of bacterial pathogens, but more likely from the upregulation of opportunistic pathogens present either in the coral mucus/tissues or in the water.


Mots-clés :
  • (Anglais) Vector
  • (Anglais) Parrotfish
  • (Anglais) Coral disease
  • (Anglais) Coral