Fig. 1. Photographs of habitats and colonies of two populations of Alviniconcha marisindica in the Central Indian Ridge and analytic and experimental set-ups used in this study.

Magenta circles indicate the typical habitats and colonies of kAlv in the Kairei field (a) and of eAlv in the Edmond field (b). The schematic illustration shows representative experiments and analyses conducted in situ, onboard, and in the laboratory (c). The numbers in circles represent samples used in each experiment.