Figure 5.

(A–F) Dinophysis acuminata and (G–L) Protoceratium reticulatum subniches’ dynamics considering only the summer period in the inner portion of the Reloncaví Fjord (sampling stations 4 to 9) and their relationship with the physical and meteorological variables (blue vectors; see Figure 3 for meaning of labels). Main variables associated with bloom conditions for both species (detected by conditional inference tree analyses) are indicated with asterisks. The blue dots represent the mean habitat condition used by the species in the entire sampling domain (i.e., species’ niche position) whereas the black labels represent the mean habitat condition used by the species in the subset (i.e., species’ subniche position). The black and red vectors represent species marginalities (i.e., WitOMIG and WitOMIG_k, respectively). The red dots represent the mean habitat condition in each subset (G_k). The light blue polygon represents the realized environmental space (i.e., sampling domain). For each species, the existing fundamental subniches (polygons delimited by yellow lines) are given by the overlap between the subsets (dark blue polygons) and the species’ realized niche (polygon delimited by dashed orange line). The difference between the existing fundamental subniche and the species subniche (light green polygons) is the “subset biotic reducing factor” (green area highlighted by diagonal lines), which correspond to the biological constraint exerted on the species that can be caused either by negative biological interactions or species dispersal limitations.