DNA FROM FROZEN EARTH SUGGESTS MAMMALS WEATHERED VOLCANIC DISASTER
Ancient DNA, preserved in the frozen ground, is showing that populations of Ice Age mammals maintained their genetic variety even after a significant volcanic eruption. This research, using sediment DNA (sedaDNA), offers a novel way to see how natural calamities affected animal groups, suggesting a surprising resilience. The ash layer from such an eruption, a visible marker in the permafrost, provides a clear point of reference for studying these ancient environmental events and their impact on genetic diversity.
COLD-ADAPTED LIFE AND SHIFTING HABITATS
New examinations of ancient DNA reveal how species adapted to the harsh cold of the Ice Age. This insight holds significance for understanding how creatures in today's rapidly warming world might fare. As global temperatures climb, the environments favored by cold-hardy animals are shrinking. Understanding when and how these animals developed their resistance to the cold could help pinpoint which species are most vulnerable now. The assembly of these cold-adapted species over time appears complex, with some arriving earlier and others much later, leaving the full picture unfinished.
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EXTINCT GIANTS LINGERED LONGER
Analysis of ancient DNA suggests that mammoths and other large Ice Age creatures, like woolly rhinoceroses, persisted for a longer period than previously believed. These animals coexisted with humans for tens of thousands of years before their eventual disappearance. The long-standing debate about the extinction of these large grazing animals has been complicated by this new genetic evidence. While most woolly mammoths were thought to have died out around 10,000 years ago, with only small pockets surviving on remote Siberian islands, the extended overlap with humans in the Arctic, coupled with a better understanding of the 'Mammoth Steppe' ecosystem and its rapid changes, appears to weaken the argument that humans were the primary cause of their extinction.
HYBRID MAMMUTHS AND THE OLDEST GENOMES
The oldest known DNA, predating human and Neanderthal existence by millennia, has shed light on the evolution of Ice Age mammoths. This research has identified a hybrid mammoth lineage, composed of roughly equal parts from what is known as the Krestovka lineage and the woolly mammoth. The Columbian mammoth, which roamed North America during the last Ice Age, has also been identified as a hybrid based on these analyses. The samples examined are remarkably ancient, a thousand times older than Viking remains, providing an unprecedented glimpse into the deep past.
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