نتایج جستجو برای: mastodon
تعداد نتایج: 86 فیلتر نتایج به سال:
I n this issue of PNAS, Jones et al. (1) address an issue that has been with us, in one way or another, for some 200 years. Around the year 1800, French paleontologist Georges Cuvier established the reality of vertebrate extinction by using animals so large that their future discovery on the hoof was highly unlikely (2). Included on the list were some now known to have been late Pleistocene in ...
During the first two years of his voyage aboard HMS Beagle, Charles Darwin collected a considerable number of fossil mammals from various localities in Argentina and Uruguay. Among these remains are those of large mammals that Darwin informally assigned to Megatherium and Mastodon, the only large taxa then known for South America, and of small and mediumsized mammals that Darwin recognized as r...
The diversity of life on Earth is the result of perpetual evolutionary processes beginning at life’s origins; evolution is the fundamental development strategy of life. Today, studies of gene and protein sequences, including various genome-sequencing projects, provide insight into these evolutionary processes and events. However, the sequence data obtained is restricted to extant genes and prot...
Elephantids are the world's most iconic megafaunal family, yet there is no comprehensive genomic assessment of their relationships. We report a total of 14 genomes, including 2 from the American mastodon, which is an extinct elephantid relative, and 12 spanning all three extant and three extinct elephantid species including an ∼120,000-y-old straight-tusked elephant, a Columbian mammoth, and wo...
Since Elon Musk revealed his intention to buy Twitter, unease has spread throughout the scientific community. What was once main channel for communication now seen its predominance threatened. This work analyzes changes and consequences over first months of Musk’s administration –a period that marked by incessant in which part community found sufficient grounds migrate other platforms, with Mas...
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