FIGURE 2 | Coastal transitional systems considered in this study: (a) Minho estuary; (b) Lima estuary; (c) Neiva estuary; (d) Cávado estuary; (e) Ave estuary; (f) Leça estuary; (g) Douro estuary; (h) Esmoriz; (i) Aveiro coastal lagoon; (j) Mondego estuary; (k) Liz estuary; (l) Óbidos coastal lagoon; (m) Tagus estuary; (n) Albufeira coastal lagoon; (o) Sado estuary; (p) Santo André coastal lagoon; (q) Mira estuary; (r) Alvor estuary; (s) Aráde estuary; (t) Ria Formosa coastal lagoon, and (u) Guadiana