Percorrer por autor "Bertacchi, Alex"
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- Ancient DNA and deep population structure in sub-Saharan African foragersPublication . Lipson, Mark; Sawchuk, Elizabeth A.; Thompson, Jessica C.; Oppenheimer, Jonas; Tryon, Christian A.; Ranhorn, Kathryn L.; de Luna, Kathryn M.; Sirak, Kendra A.; Olalde, Iñigo; Ambrose, Stanley H.; Arthur, John W.; Arthur, Kathryn J. W.; Ayodo, George; Bertacchi, Alex; Cerezo-Román, Jessica I.; Culleton, Brendan J.; Curtis, Matthew C.; Davis, Jacob; Gidna, Agness O.; Hanson, Annalys; Kaliba, Potiphar; Katongo, Maggie; Kwekason, Amandus; Laird, Myra F.; Lewis, Jason; Mabulla, Audax Z. P.; Mapemba, Fredrick; Morris, Alan; Mudenda, George; Mwafulirwa, Raphael; Mwangomba, Daudi; Ndiema, Emmanuel; Ogola, Christine; Schilt, Flora; Willoughby, Pamela R.; Wright, David K.; Zipkin, Andrew; Pinhasi, Ron; Kennett, Douglas J.; Manthi, Fredrick Kyalo; Rohland, Nadin; Patterson, Nick; Reich, David; Prendergast, Mary E.Multiple lines of genetic and archaeological evidence suggest that there were major demographic changes in the terminal Late Pleistocene epoch and early Holocene epoch of sub-Saharan Africa(1-4). Inferences about this period are challenging to make because demographic shifts in the past 5,000 years have obscured the structures of more ancient populations(3,5). Here we present genome-wide ancient DNA data for six individuals from eastern and south-central Africa spanning the past approximately 18,000 years (doubling the time depth of sub-Saharan African ancient DNA), increase the data quality for 15 previously published ancient individuals and analyse these alongside data from 13 other published ancient individuals. The ancestry of the individuals in our study area can be modelled as a geographically structured mixture of three highly divergent source populations, probably reflecting Pleistocene interactions around 80-20 thousand years ago, including deeply diverged eastern and southern African lineages, plus a previously unappreciated ubiquitous distribution of ancestry that occurs in highest proportion today in central African rainforest hunter-gatherers. Once established, this structure remained highly stable, with limited long-range gene flow. These results provide a new line of genetic evidence in support of hypotheses that have emerged from archaeological analyses but remain contested, suggesting increasing regionalization at the end of the Pleistocene epoch. DNA analysis of 6 individuals from eastern and south-central Africa spanning the past approximately 18,000 years, and of 28 previously published ancient individuals, provides genetic evidence supporting hypotheses of increasing regionalization at the end of the Pleistocene.
- Earliest evidence for intentional cremation of human remains in AfricaPublication . Cerezo-Román, Jessica I.; Sawchuk, Elizabeth; Schilt, Flora Cecilia; Bertacchi, Alex; Buckley, Gina; Chibisa, Edwin; Fahey, B. Patrick; Falchenberg, Sofia Gunilla Hedman; Kaliba, Potiphar; Kennett, Douglas J.; Mercader, Julio; Pargeter, Justin; Stock, Jay; Szymanski, Ryan; Thompson, Jessica C.Human cremation on an open pyre demands intensive labor, communal resources, and sensory exposures. We report the earliest evidence for intentional cremation in Africa, the oldest in situ adult pyre in the world, and one of only a few associated with hunter-gatherers. A large cremation feature at Hora 1 in Malawi dates to similar to 9500 years ago and contains the remains of a small, gracile adult with evidence for perimortem defleshing and postcremation manipulation. Subsequent revisiting of the site to build fires in the same place provided additional pyrotechnological spectacles. High-resolution, multiproxy reconstruction of the ritual associated with cremation and its subsequent deposition demonstrates complex mortuary practices among ancient African foraging groups with substantial social investment and use of natural landscape features as persistent mortuary monuments.