In the Seychelles found resurgent birds
The rise in sea level destroyed the flightless birds, but they found a way to come back to life.
14 may 2019 09:15
In the genus Dryolimnas family rails (lat. Rallidae) included two species (three subspecies) of birds. Having chosen Comoros, Madagascar and Seychelles, each species began to develop his own way, and some lost the ability to fly: it happened because of too comfortable conditions and absence of predators. And it’s played with the birds a cruel joke: with the rise in sea level during the Pleistocene, almost all birds became extinct – they were unable to leave the island.
But then the land rose again to the surface of the water, and there again there were flightless birds. By studying fossils, scientists have discovered an interesting example of an iterative (re -) evolution. This is a rare case of development of one and the same species from the same ancestor, but at different times.
The new study was conducted by specialists of the University of Portsmouth and the natural history Museum. They found that kaviarov the rail Dryolimnas cuvieri appeared on the Aldabra Atoll, part of the Seychelles archipelago, for the second time: 136 thousand years ago, the only flying ancestor, then living in Madagascar, again populated Atoll, which became suitable for life. And then the boy once again forgotten how to fly, becoming a different subspecies.
Currently algebarski D. cuvieri is the last living representative of the genus and the last flightless bird in the Indian ocean. The rest of the cowherd boys did not cope with natural disasters, and in some cases their disappearance was guilty of invasive species introduced to Islands.
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