Discovery of extinct giant tortoise species
Researchers from Yale University have discovered two extinct species of giant tortoises from the Galapagos Islands. This discovery was made possible by analyzing degraded DNA obtained from museum specimens in the form of dry bones. The use of a new computer algorithm allowed for the reconstruction of the evolutionary tree even with less than 1% of the genome preserved.
The obtained data was superimposed on a reference phylogenetic model of modern reptiles, which enabled the identification of unique extinct tortoise lineages from the islands of San Cristobal and Santa Fe. Previously, similar samples could not be used due to high levels of biological contamination.
The main difficulty lay in reconstructing the genetic relationships of the extinct Galapagos tortoises, as the obtained DNA was highly degraded and fragmented.
Alexander Ochoa
Additionally, sailors who traveled between the islands transported giant tortoises as live provisions, which led to the mating of tortoises lost by sailors with local species. The genes of the vanished populations identified in this study may still live in modern hybrid tortoises. This discovery may serve as a basis for breeding programs that could revive lost species in future generations.
Significance of the discovery
The discovery of new species of giant tortoises from the Galapagos Islands highlights the importance of studying genetic connections between extinct and modern species. The application of the latest technologies for analyzing ancient DNA allows us to deepen our understanding of evolutionary processes and biodiversity in the past. It also raises hopes for the revival of lost species, which could have a positive impact on the ecosystems in which they existed.
Such studies open new horizons in nature conservation and the biological diversity of the planet.
The findings from the Galapagos tortoises research underscore the significance of understanding genetic pathways in evolution. This is reminiscent of recent studies that reveal how shared ancestry influences the evolutionary trajectories of various species. For a deeper insight into the genetic connections that shape animal evolution, explore the details in our article on genetic 'highways'.