Fig. 1
Adapted from Fig. 6.1 in [19]
Indicator species groups (ISGs). Representation of the twenty-two ISGs selected for the systematic map based on their trophic level (vertically) and scale of indication (horizontally). Among an ISG, these two parameters might differ between species or stages of development (i.e., larva or adult), so the main classification is indicated by its name in a rectangle, and the other possibilities by a dot connected with a line (plain to indicate possible variations in trophic level and dashed in the scale of indication). These classifications are not exhaustive and are primarily intended to provide an overview of the different ISGs.