Specie non-indigene marine e delle acque di transizione e loro distribuzione a livello regionale

A literature survey was performed in order to check the occurrence of non-indigenous marine and brackish species in each Italian region. A total of 613 regional records, referred to 205 non-indigenous species (NIS) were collected. The regions with the highest number of NIS are Sicily, Apulia and Veneto. The number of NIS is positively correlated with the number of ports occurring in each region.