Genomic evidence for West Antarctic Ice Sheet collapse during the Last Interglacial

• 成果类型: Article
• 署名作者: Lau, Sally C. Y.; Wilson, Nerida G.; Golledge, Nicholas R.; Naish, Tim R.; Watts, Phillip C.; Silva, Catarina N. S.; Cooke, Ira R.; Allcock, A. Louise; Mark, Felix C.; Linse, Katrin; Strugnell, Jan M.
• 署名单位: James Cook University; James Cook University; James Cook University; Western Australian Museum; University of Western Australia; Western Australian Museum; Victoria University Wellington; University of Jyvaskyla; Universidade de Coimbra; James Cook University; Ollscoil na Gaillimhe-University of Galway; Ollscoil na Gaillimhe-University of Galway; Helmholtz Association; Alfred Wegener Institute, Helmholtz Centre for Polar & Marine Research; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC); NERC British Antarctic Survey
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-13271
• DOI: 10.1126/science.ade0664
• 发表日期: 2023-12-22
• 页码: 1384-1389
• 关键词: population-size changes; sea-level rise; cryptic speciation; read alignment; FUTURE; diversity; patterns; invertebrates; biodiversity; adaptation

摘要

The marine-based West Antarctic Ice Sheet (WAIS) is considered vulnerable to irreversible collapse under future climate trajectories, and its tipping point may lie within the mitigated warming scenarios of 1.5 degrees to 2 degrees C of the United Nations Paris Agreement. Knowledge of ice loss during similarly warm past climates could resolve this uncertainty, including the Last Interglacial when global sea levels were 5 to 10 meters higher than today and global average temperatures were 0.5 degrees to 1.5 degrees C warmer than preindustrial levels. Using a panel of genome-wide, single-nucleotide polymorphisms of a circum-Antarctic octopus, we show persistent, historic signals of gene flow only possible with complete WAIS collapse. Our results provide the first empirical evidence that the tipping point of WAIS loss could be reached even under stringent climate mitigation scenarios.