Tracking signals of change in Mediterranean fish diversity based on local ecological knowledge.

A positive trend of increase of water temperature and important changes in the water circulation of the Mediterranean Sea are visible since the 1980s [13] , [57] and this might be at the basis of the geographical spread and success of thermophilic biota.

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Many respondents reported an increase of this species but others, the oldest ones with more than 30 year of experience reported a period of decline in the 70s and in the 80s followed by a clear trend of increase in the last ten years.

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