The Mediterranean Sea is rapidly changing under ongoing climate change. In the eastern basin, tropicalization is already well documented and driven by a combination of strong warming and the influx of tropical species through the Suez Canal. In contrast, the western Mediterranean has, until now, sho wn fewer such signals. However, a recent study demonstrates that the expansion of microscopic warm-water species provides a clear and early indication of tropicalization impacts on marine ecosystems. ...read more read less