2023-11-22 19:26:22
Populations have been displaced so much that around a hundred species are now found in all regions of the world.
Freshwater fish are not great travelers. And for good reason: visiting new continents requires crossing seas or oceans, salty water in which they cannot survive. Yet, work published in the journal Science Advances reveal that several hundred species of freshwater fish that were previously found exclusively in a single region of the world now have a geographic distribution that spans several continents. A situation so unprecedented that it has not been reproduced on Earth… for more than 200 million years and the separation of Pangea, the last supercontinent, which brought together almost all of the land surface.
To achieve these results, scientists studied the global database on the presence of freshwater fish species in watersheds updated in August 2019. In total, 66,715 observations were made. analyzed for 11,333 species in 3119 basins…
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