Invasive fish push westward as the Mediterranean Sea slowly becomes tropical | Marine l... - 0 views
www.theguardian.com/...ut-native-species-in-hot-water
mediterranean fish marine economy climate environment biodiversity


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Among the more than 70 tropical fish that taken up residence in the Mediterranean, the lionfish (Pterois miles), silver-cheeked toadfish (Lagocephalus sceleratus), blue-spotted cornetfish (Fistularia commersonii) and the Golani round herring (Etrumeus golanii) have been spotted in increasingly western waters. As the sea warms and becomes saltier because of human-induced global heating, fish from tropical latitudes are finding a more welcoming habitat in an area that, at least nominally, is temperate, not tropical.
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marine scientists are concerned about threats to biodiversity, public health and fisheries. A shift from temperate to tropical would, and does, affect the whole Mediterranean ecosystem. Rabbitfish, for example, eat so much that they transform algal forests into barren wastes, destroying important nursery habitats for native species
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the western Mediterranean will become increasingly habitable for tropical fish, as will the south Adriatic and south-west Italian coast. The newcomers may change, too, as they adapt. Some scientists argue that the lionfish – spotted off Apulia, Italy, and Albania in 2019 and 2020 – might expand its temperature range, coping with the colder winter waters of certain Mediterranean areas, as has happened with lionfish in the US.
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Between 1985 and 2006, the temperature of the Mediterranean rose by about 0.4C each decade, adding pressure to already overfished native species while favouring fish that thrive in warmer waters.
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Efforts to create marine-protected areas and to restore ecosystems to make them more resilient to global heating and invasions may help
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unlikely to reverse the trend, especially without full cooperation among states. “Nature doesn’t know about borders, right?”