By drawing up lists of species associated with each type of sediment, a cluster analysis was carried out based on sediment type. The dendrogram shows that fish assemblages can also be grouped according to sediment type. The first cluster is associated with fine sediments (all pelites), while a second is linked to medium-grained sediments (silty-clay sand, gravelly sand and till). A third cluster is associated with coarser sediments (medium- to coarse-grained sand and gravel). The dissimilarity among clusters linked to dolomitic limestone gravel, shell banks and carbonate sand is due simply to the small number of fishing stations associated with these sediment types.

Jacques Leclerc