Appendix S1 Characteristics of the 12 environmental factors selected.

Appendix S2 Numerical criteria of selection of dominant and secondary species.

Appendix S3 Maps of the spatial distribution of each group for the six cut-off levels selected by the nonparametric probabilistic ecological niche (NPPEN) procedure, and map of the biogeochemical provinces (BGCPs) proposed by Longhurst (1998).

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