Many of the methanogens and other anaerobic organisms that dominated the planet before the rise of oxygen would have either perished in this revolution or found themselves confined to increasingly restricted habitats 许多在氧气浓度上升前主宰地球的产甲烷菌与其他厌氧生物,若非在此异变中灭绝,就是发现自己的生存空间已逐渐遭受压缩。