This blog may help people explore some of the 'hidden' issues involved in certain media treatments of environmental and scientific issues. Using personal digital images, it's also intended to emphasise seasonal (and other) changes in natural history of the Swansea (South Wales) area. The material should help participants in field-based modules and people generally interested in the natural world. The views are wholly those of the author.
Friday, 31 May 2024
Is Homo sapiens Like the Grey Squirrel?
Grey squirrels, introduced from North America, largely eradicated the UK's native Reds. A contributing factor was the transmission of Squirrel pox. The Reds are much more sensitive to this viral disease than their Grey cousins. Large numbers of infected Reds died. Jonathan Kennedy (Queen Mary University College, London) suggests something similar happened, when Homo sapiens 'out-competed' Neanderthals (https://www.theguardian.com/commentisfree/article/2024/may/30/50000-year-old-herpes-virus-humans-dna-homo-sapiens-neanderthals). It's now accepted that Neanderthals were remarkably sophisticated. Some current human populations also carry 2% of Neanderthal genes. This proves there was interbreeding between these two hominid species. Kennedy notes, however, that Homo sapiens evolved nearer the equator. This made them more likely to carry a range of viral infections than Neanderthals. He says that recent advances in studying ancient DNA, have enabled scientists to identify viruses found in fossiled human remains. For example, a 50,000 year-old virus has now been identified in skeletal tooth plaque. Kennedy opines that Homo sapiens might have 'finished off' Neanderthals, by infecting them with deadly viral diseases. Plagues have been quite common in human history. Not so different, then, from the Grey squirrel story?
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