Was the Great Dying the Great Sterilisation?

• Autores: Colin Barras
• Localización: New scientist, ISSN 0262-4079, Nº. 3165, 2018, pág. 8
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • Scientists have long debated the cause of an event 252 million years ago, at the end of the Permian period, during which most complex life died. Some years ago, geologists noticed something odd about pollen from the time. Many of the pollen grains were malformed or underdeveloped. The UV-B may have harmed plants like conifers and seed ferns. To mimic this, Jeffrey Benca and his colleagues at the University of California, Berkeley, exposed 18 dwarf conifers to elevated UV-B levels for 56 days.