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Image: This illustration shows three extinct rhino species reconstructed by an ancient artist, whose genome sequencing is part of the research
There is an old problem that dates back to the Darwin era, and that is the relationship between the five species of rhinos that exist in the world
The results of the study indicate that the oldest African and Eurasian ancestry separated about 16 million years ago
Love Dalén (@love_dalen) from the Center for Paleogenetics and the Swedish Museum of Natural History said: “We can now prove that the main branches of the rhino tree of life are between geographic regions, Africa and Eurasia, instead of having one Horns and two-horned rhinos
Mick Westbury (@Mick2474) of the University of Copenhagen, Denmark, said: “These eight species have either continued to slowly decline in population size in the past 2 million years, or the population size has continued to grow for a long time.
This view is consistent with rhinos' apparent lack of cumulative deleterious mutations in recent decades
The inspiration for this new research came from a scientific meeting
Shanlin Liu of China Agricultural University said there are some challenges to overcome
Genomic data represents different types of data, partly because it contains modern and ancient DNA
Dalén stated that these findings are "partly good news and partly not
"However, we also found that compared with our historical and prehistoric rhino genomes, rhinos now have lower genetic diversity and higher levels of inbreeding," he said
Researchers say that these findings do have some practical implications for rhino protection
Westbury said: "Now we know that the low diversity that we see in contemporary individuals may not be a sign of inability to recover, but the natural state of rhinos
The research team hopes that these new discoveries will help the continued research and protection of rhinos
Westbury said: "We hope this will provide a framework for a better understanding of where migrating populations may be generated, direct changes in genetic diversity, and whether populations may disappear forever because of humans
Original search:
Cell , Liu et al.
: “Ancient and modern genomes unravel the evolutionary history of the rhinoceros family” https://
