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- W4291900265 abstract "The origin of the African savanna has been traced back to 10–6 million years (Ma) ago, but the mechanisms driving its evolution are hotly debated, and include global atmospheric CO2, regional fire activity, herbivore competition, and hydrological climate change. Here, we present the first microcharcoal-based fire activity records covering the last ~7 Ma at four International Ocean Discovery Program (IODP) sites near southern Africa. The records show that fire activities in both savanna and non-savanna regions were stable during this interval. Grass vegetation in burnt biomass continued to expand from 6 Ma into the present savanna region, whereas no grass expansion was observed in non-savanna regions. A compilation of regional data suggests asynchronous C4 grass expansion since 6 Ma on the African Continent. We consider that CO2 concentrations and wildfires might have caused the first appearance of C4 plants at ~10 Ma and ~ 7–6 Ma, respectively. Since 6 Ma, the regional climate promoted expansion of C4 plants into the present-day savanna habitat." @default.
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- W4291900265 date "2022-10-01" @default.
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- W4291900265 title "Wildfire history and savanna expansion across southern Africa since the late Miocene" @default.
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- W4291900265 doi "https://doi.org/10.1016/j.palaeo.2022.111189" @default.
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