Use of Stable Isotope Analysis in R (SIAR) on the trophic ecology of several gastropods species from hydrothermal vents

Trophic ecology in the hydrothermal vent ecosystem is usually investigated by using stable isotopes, however what is often missing are the potential isotopic signatures of the food sources and their relative contribution to the consumers’ diet into the hydrothermal vent food web. Here, we have used a recent Bayesian mixing model (SIAR) based on the stable isotope ratios (δ13C, δ15N) to calculate the contribution of potential food sources to six vent gastropods diets (Lepetodrilus elevatus, L. pustulosus, Cyathermia naticoides, Peltospira delicata, P. operculata and Rhynchopelta concentrica) known as primary consumer (mostly bacterivores and detritivores) sampled on East Pacific Rise at 9°50 and 13°N in 2010 and 2012. Several potential food sources were identified such as the biofilm of the mussel Bathymodiolus thermophilus, biofilm of the siboglinid tubeworms Riftia pachyptila, the tubeworms itself, biofilm of the polychaete Alvinella pompejana and the worm itself, the particle organic matter and chemoautotrophic bacteria. Contributions of the sources calculated by SIAR to primary consumers’ diet varied following habitats on the vent, location on the site and species highlighting a certain plasticity of the food consumption in vent gastropods and reinforcing the knowledge of resource partitioning in this group. We cannot exclude the potential contribution of carbon via symbiosis in some of these gastropods diets. However, some of the results were confirmed by microscopic evidences (Transmission Electron Microscope) carried on the gut content of the gastropods. Results sustain also the role of primary consumers in the bottom-up regulation into the hydrothermal food web.

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First Name: 
Sylvie Marylène
Last Name: 
Gaudron
Telephone: 
0033 (0)144273781
Affiliation: 
University of Pierre and Marie Curie (UPMC), UMR7138 CNRS France
First Name: 
Lise
Last Name: 
Marqué
Affiliation: 
University of Pierre and Marie Curie (UPMC), UMR7138 CNRS France
First Name: 
Sébastien
Last Name: 
Duperron
Affiliation: 
University of Pierre and Marie Curie (UPMC), UMR7138 CNRS France
First Name: 
Magali
Last Name: 
Zbinden
Affiliation: 
University of Pierre and Marie Curie (UPMC), UMR7138 CNRS France
Choose keywords that are most applicable to your abstract. (Three maximum.): 
Trophic relations (including symbiosis)
Abstract ID: 
CBE5-102