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’Life finds a way’ : How rainbowfish survive in Australia’s scorching desert

Phys.org/news (JANUARY 27, 2022)

Titre : ’Life finds a way’ : How rainbowfish survive in Australia’s scorching desert

A trip into central Australia involves packing your 4WD to the brim with survival gear, water and food. Yet fish have managed to persist in that parched landscape for thousands of years—how do they do it ?

Phys.org/news (JANUARY 27, 2022)

Présentation
Native desert rainbowfish (Melanotaenia splendida tatei) live in the deserts of central Australia. They grow to about 9cm and are usually silver and iridescent, with a yellow and green checkered pattern on the fins. Desert rainbowfish populations live in slow-flowing and still habitats, including impermanent rivers, waterholes, lakes, flowing bores and stock dams.Their populations fluctuate during boom-bust cycles. During rare flooding events in the desert, rainbowfish breed in large numbers and spread along temporary streams and floodwaters.

Our research sought to determine how rainbowfish populations persist in desert regions of central Australia, and whether their genomes show evidence of adaptation to the local harsh conditions. We collected 344 desert rainbowfish from 18 rivers and waterholes from across the vast and arid Lake Eyre Basin, and from semi-arid regions of the Murray-Darling Basin. We then compared the variation in the genomes of these fish with data from satellite images about the presence of surface water in central Australia.

Source  : Catherine R. M. Attard Et Al, The Conversation

Annonce (Phys.org/news)

Page publiée le 13 janvier 2023