1) Fine geochemical characterization of two deep-sea hydrothermal sites and surrounding areas as well as inactive sites habitats
2) Inventory of the biodiversity in these habitats (biology and microbiology), and assemblages description with regard to geochemical constraints, their succession in time and space
3) Complete the life cycle study of Rimicaris sp., in situ larvae and sex repartition survey, in vivo experimentations to test seasonality hypothesis to better appreciate Adaptation/dispersion capabilities, and infer connectivity