A pair of eyeless, burrowing fish species, separated millions of years ago, have been put on both sides of the Indian Ocean. In one study, Madagascar and Australian cave fish all had a common ancestor. Their ancestors may have lived in the caves of the prehistoric supercontinent Gondwana. Continental drifts tore up this family except that they ship to their current location.
Darwin's journey on his discovery was colorless and eyeless. The emergence of burrowing creatures was so strange and primitive that he thought they were "those ancient lives."
Two populations of gobies of particular interest to the curator of the Natural Science Museum at Louisiana State University and his colleagues live in Madagascar and northwest Australia. The largest family of goby fishes forms one containing about 2,000 different species. Although the cave fish live in different parts of the world sharing important characteristics: they are small, in the length of 10 cm, no eyes, no color and live in fresh water, limestone caves.
This similar fish lives on different sides of the world and the questions researchers hope to answer.
The challenges and opportunities for species to adapt to the environment, through the process of natural selection, only the survival of the fittest. When independent species are under the same selective pressure, they tend to come up with the same solution, a process that is called convergent evolution. To determine which program is most likely to be the phylogenetic analysis of the investigation team, a history of the study was held in the deep of its DNA sequence to rebuild the goby family tree. The researchers compared more than 100 different species of catfish, including cave fish from Australia and Madagascar, and the researchers collected DNA sequences. Although separated by thousands of kilometers of ocean, the burrowing fish genes of Madagascar and Northwestern Australia are more similar and they share a common ancestor with each other than any other gobies.
According to a co-author of the American Museum of Natural History, “The segregation of Gondwana from the sister-group relationship between the reserves of cave fish between Madagascar and Australia is a striking example — history can be traced back to the late Cretaceous division.â€
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