If the Mediterranean basin was formed by an eruption, relatively recently
Eh? The last truly cataclysmic event in the Mediterranean basin was about 5 million years ago -- a bit too early for sea trade routes. And if you mean the Santorini eruption, it did not kill off the local flora and fauna necessitating introduction events.
Well, no, I didn't mean that the sea trade was the only source of introductions, just that it might have left still-distinct 'tracks' by adding species less likely to be carried in by the initial flood.
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