Fiche participant :
Nom : Hoyoux
Prénom : Caroline
Liste des participations aux campagnes accessibles
- SALOMONBOA 3
- (Mon Sep 10 00:00:00 CEST 2007 - Wed Sep 26 00:00:00 CEST 2007)
- Mon Sep 10 11:20:59 CEST 2007 - Wed Sep 26 00:00:00 CEST 2007 Récolteur (Physiologie, Université de Liège)
Exporter les bibliographies
Becker P.T., Samadi S., Zbinden M., Hoyoux C., Compère P. & De ridder C. 2009. First insignts into the gut microflora associated with an echinoid from falls environments. Cahiers de Biologie marine 50: 343-352
Campagnes accessibles citées (2) [+] [-]
Codes des collections associés: IE (Échinodermes)
Hoyoux C., Zbinden M., Samadi S., Gaill F. & Compère P. 2009. Wood-based diet and gut microflora of a galatheid crab associated with Pacific deep-sea wood falls. Marine Biology 156(12): 2421-2439. DOI:10.1007/s00227-009-1266-2
Résumé [+] [-]Wood falls in the deep sea have recently become the focus of studies showing their importance as nutrients on the deep-sea floor. In such environments, Crustaceans constitute numerically the second-largest group after Mollusks. Many questions have arisen regarding their trophic role therein. A careful examination of the feeding appendages, gut contents, and gut lining of Munidopsis andamanica caught with wood falls revealed this species as a truly original detritivorous species using wood and the biofilm covering it as two main food sources. Comparing individuals from other geographic areas from substrates not reported highlights the galatheid crab as specialist of refractory substrates, especially vegetal remains. M. andamanica also exhibits a resident gut microflora consisting of bacteria and fungi possibly involved in the digestion of wood fragments. The results suggest that Crustaceans could be full-fledged actors in the food chains of sunken-wood ecosystems and that feeding habits of some squat lobsters could be different than scavenging.
Campagnes accessibles citées (6) [+] [-]
Codes des collections associés: IU (Crustacés)
Hoyoux C., Zbinden M., Samadi S., Gaill F. & Compère P. 2012. Diet and gut microorganisms of Munidopsis squat lobsters associated with natural woods and mesh-enclosed substrates in the deep South Pacific. Marine Biology Research 8(1): 28-47. DOI:10.1080/17451000.2011.605144
Résumé [+] [-]Squat lobsters of the deep-sea genus Munidopsis are among the most regularly reported crustaceans associated with deep-sea wood falls. They are often thought to indirectly use these substrates for preying or scavenging wood-associated molluscs or annelids, albeit the species M. andamanica has been recently highlighted as a xylophagous specialist. In this work, we examined the feeding appendages, gut contents and gut lining of M. nitida, M. bispinoculata and M. pilosa specimens from natural sunken woods and compared them with specimens of the same species having survived and grown on different hard-to-digest substrates (i.e. woods, turtle shells and whale bones) experimentally submerged in the deep South Pacific. In both cases, all three species directly ingest large wood fragments deeply degraded by microorganisms, but M. nitida also feeds on experimentally submerged whale bone and turtle shell fragments. Munidopsis nitida is also the only species to host a resident gut microflora, but the bacterial morphotypes vary according to the ingested substrate. The results suggest that the three species are most probably opportunistic, bacterivorous detritivores and that M. nitida could be at the beginning of an evolutionary process towards xylophagy within the genus Munidopsis.
Campagnes accessibles citées (5) [+] [-]
Codes des collections associés: IU (Crustacés)
Zbinden M., Pailleret M., Ravaux J., Gaudron S.M., Hoyoux C., Lambourdière J., Warén A., Lorion J., Halary S. & Duperron S. 2010. Bacterial communities associated with the wood-feeding gastropod Pectinodonta sp. (Patellogastropoda, Mollusca): Bacteria associated with a wood-feeding gastropod. FEMS Microbiology Ecology 74(2): 450-463. DOI:10.1111/j.1574-6941.2010.00959.x
Résumé [+] [-]Even though their occurrence was reported a long time ago, sunken wood ecosystems at the deep-sea floor have only recently received specific attention. Accumulations of wood fragments in the deep sea create niches for a diverse fauna, but the significance of the wood itself as a food source remains to be evaluated. Pectinodonta sp. is a patellogastropod that exclusively occurs on woody substrates, where individuals excavate deep depressions, and is thus a potential candidate for a wood-eating lifestyle. Several approaches were used on Pectinodonta sampled close to Tongoa island (Vanuatu) to investigate its dietary habits. Host carbon is most likely derived from the wood material based on stable isotopes analyses, and high cellulase activity was measured in the digestive mass. Electron microscopy and FISH revealed the occurrence of two distinct and dense bacterial communities, in the digestive gland and on the gill. Gland-associated 16S rRNA gene bacterial phylotypes, confirmed by in situ hybridization, included members of three divisions (Alpha- and Gammaproteobacteria, Bacteroidetes), and were moderately related (90-96% sequence identity) to polymer-degrading and denitrifying bacteria. Gill-associated phylotypes included representatives of the Delta- and Epsilonproteobacteria. The possible involvement of these two bacterial communities in wood utilization by Pectinodonta sp. is discussed.
Campagnes accessibles citées (3) [+] [-]
Codes des collections associés: IM (Mollusques)