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25 results on '"Kwekason, Amandus"'

2. Entwined African and Asian genetic roots of medieval peoples of the Swahili coast

Author

Brielle, Esther S., Fleisher, Jeffrey, Wynne-Jones, Stephanie, Sirak, Kendra, Broomandkhoshbacht, Nasreen, Callan, Kim, Curtis, Elizabeth, Iliev, Lora, Lawson, Ann Marie, Oppenheimer, Jonas, Qiu, Lijun, Stewardson, Kristin, Workman, J. Noah, Zalzala, Fatma, Ayodo, George, Gidna, Agness O., Kabiru, Angela, Kwekason, Amandus, Mabulla, Audax Z. P., Manthi, Fredrick K., Ndiema, Emmanuel, Ogola, Christine, Sawchuk, Elizabeth, Al-Gazali, Lihadh, Ali, Bassam R., Ben-Salem, Salma, Letellier, Thierry, Pierron, Denis, Radimilahy, Chantal, Rakotoarisoa, Jean-Aimé, Raaum, Ryan L., Culleton, Brendan J., Mallick, Swapan, Rohland, Nadin, Patterson, Nick, Mwenje, Mohammed Ali, Ahmed, Khalfan Bini, Mohamed, Mohamed Mchulla, Williams, Sloan R., Monge, Janet, Kusimba, Sibel, Prendergast, Mary E., Reich, David, and Kusimba, Chapurukha M.

Published
2023
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6. Early Pliocene fauna from the Lower Laetolil Beds, Laetoli, Tanzania.

Author

Harrison, Terry, Su, Denise F., Fillion, Elizabeth N., and Kwekason, Amandus

Subjects
FOSSIL mammals, FOSSIL vertebrates, PALEONTOLOGY, PALEOECOLOGY, PROBOSCIDEA (Mammals)
Abstract

The mid-Pliocene Upper Laetolil Beds at Laetoli in northern Tanzania have produced a rich diversity of fossil vertebrates, including the remains and traces of the early hominin, Australopithecus afarensis. The fauna from the older Lower Laetolil Beds, dating from 3.8 Ma to older than 4.3 Ma, has not previously been the subject of detailed analysis. This study, based on renewed palaeontological investigations, provides the first systematic account of the fauna, along with a brief synthesis of the geology and palaeoecology. Forty species of mammals are recorded from the Lower Laetolil Beds, dominated by bovids, equids, rhinocerotids, and proboscideans, in addition to reptiles, birds, and invertebrates. The mammal fauna is very similar to that from the Upper Laetolil Beds, and to a lesser extent to the Upper Ndolanya Beds, indicating a high degree of faunal continuity and provinciality in the Laetoli area during much of the Pliocene. Evidence indicates that the palaeoecology of the Lower Laetolil Beds was predominantly dry open woodlands-shrublands-grasslands, but dense woodlands and forests were present on the lower slopes of the nearby Satiman volcano. Water was more abundant than in the Upper Laetolil Beds, with seasonal rivers, marshes and shallow lakes bordered by riparian woodland. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Ancient DNA and deep population structure in sub-Saharan African foragers

Author

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, and Prendergast, Mary E.

Published
2022
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9. Ancient DNA reveals a multistep spread of the first herders into sub-Saharan Africa

Author

Prendergast, Mary E., Lipson, Mark, Sawchuk, Elizabeth A., Olalde, Iñigo, Ogola, Christine A., Rohland, Nadin, Sirak, Kendra A., Adamski, Nicole, Bernardos, Rebecca, Broomandkhoshbacht, Nasreen, Callan, Kimberly, Culleton, Brendan J., Eccles, Laurie, Harper, Thomas K., Lawson, Ann Marie, Mah, Matthew, Oppenheimer, Jonas, Stewardson, Kristin, Zalzala, Fatma, Ambrose, Stanley H., Ayodo, George, Gates, Henry Louis, Gidna, Agness O., Katongo, Maggie, Kwekason, Amandus, Mabulla, Audax Z. P., Mudenda, George S., Ndiema, Emmanuel K., Nelson, Charles, Robertshaw, Peter, Kennett, Douglas J., Manthi, Fredrick K., and Reich, David

Published
2019

14. Reconstructed Homo habilis type OH 7 suggests deep-rooted species diversity in early Homo

Author

Spoor, Fred, Gunz, Philipp, Neubauer, Simon, Stelzer, Stefanie, Scott, Nadia, Kwekason, Amandus, and Dean, M. Christopher

Subjects
Pithecanthropus erectus -- Research -- Analysis, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Besides Homo erectus (sensu lato), the eastern African fossil record of early Homo has been interpreted as representing either a single variable species, Homo habilis (1), or two species (2-6). [...]

Published
2015

15. The Entwined African and Asian Genetic Roots of the Medieval Peoples of the Swahili Coast

Author

Brielle, Esther S, primary, Fleisher, Jeffrey, additional, Wynne-Jones, Stephanie, additional, Broomandskhoshbacht, Nasreen, additional, Callan, Kim, additional, Curtis, Elizabeth, additional, Iliev, Lora, additional, Lawson, Ann Marie, additional, Oppenheimer, Jonas, additional, Qiu, Lijun, additional, Stewardson, Kristin, additional, Workman, Noah, additional, Zalzala, Fatma, additional, Ayodo, George, additional, Gidna, Agness, additional, Kabiru, Angela, additional, Kwekason, Amandus, additional, Mabulla, Audax, additional, Manthi, Fredrick Kyalo, additional, Ndiema, Emmanuel, additional, Ogola, Christine, additional, Sawchuk, Elizabeth, additional, Al-Gazali, Lihadh, additional, Ali, Bassam R, additional, Ben-Salem, Salma, additional, Letellier, Thierry, additional, Pierron, Denis, additional, Radimilahy, Chantal, additional, Rakotoarisoa, Jean-Aime, additional, Culleton, Brendan, additional, Mallick, Swapan, additional, Rohland, Nadin, additional, Patterson, Nick, additional, Mwenje, Mohammed Ali, additional, Ahmed, Khalfan Bini, additional, Mohamed, Mohamed Mchulla, additional, Williams, Sloan, additional, Monge, Janet, additional, Kusimba, Sibel, additional, Prendergast, Mary, additional, Reich, David, additional, and Kusimba, Chapurukha, additional

Published
2022
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16. Ancient DNA and deep population structure in sub-Saharan African foragers

Author

Zoología y biología celular animal, Zoologia eta animalia zelulen biologia, Lipson, Mark, Sawchuk, Elizabeth A., Thompson, Jessica C., Oppenheimer, Jonas, Tryon, Christian A., Ranhorn, Kathryn L., De Luna, Kathryn M., Sirak, Kendra A., Olalde Marquínez, 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., Zoología y biología celular animal, Zoologia eta animalia zelulen biologia, Lipson, Mark, Sawchuk, Elizabeth A., Thompson, Jessica C., Oppenheimer, Jonas, Tryon, Christian A., Ranhorn, Kathryn L., De Luna, Kathryn M., Sirak, Kendra A., Olalde Marquínez, 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, and Prendergast, Mary E.

Abstract

[EN] 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.

Published
2022

19. Human burials at the Kisese II rockshelter, Tanzania

Author

Laird, Myra F., primary, Sawchuk, Elizabeth A., additional, Kwekason, Amandus, additional, Mabulla, Audax Z. P., additional, Ndiema, Emmanuel, additional, Tryon, Christian A., additional, Lewis, Jason E., additional, and Ranhorn, Kathryn L., additional

Published
2021
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21. Survival of eggshell peptides over millions of years in Africa is due to mineral binding

Author

Demarchi, Beatrice, Hall, Shaun, Roncal-Herrero, Teresa, Freeman, Colin L., Woolley, Jos, Crisp, Molly K., Wilson, Julie, Fotakis, Anna, Fischer, Roman, Kessler, Benedikt, Jersie-Christensen, Rosa Rakownikow, Olsen, Jesper V., Haile, James, Thomas, Jessica, Marean, Curtis W., Parkington, John, Presslee, Samantha, Lee-Thorp, Julia, Ditchfield, Peter, Hamilton, Jacqueline F., Ward, Martyn W., Wang, Chunting Michelle, Marvin David Shaw, Harrison, Terry, Domínguez-Rodrigo, Manuel, Macphee, Ross D. E., Kwekason, Amandus, Ecker, Michaela, Horwitz, Liora Kolska, Chazan, Michael, Kröger, Roland, Thomas-Oates, Jane, Harding, John H., Cappellini, Enrico, Penkman, Kirsty, and Collins, Matthew J.

Published
2016

22. Protein sequences bound to mineral surfaces persist into deep time

Author

Demarchi, Beatrice, Hall, Shaun, Roncal-herrero, Teresa, Freeman, Colin L., Woolley, Jos, Crisp, Molly K., Wilson, Julie, Fotakis, Anna, Fischer, Roman, Kessler, Benedikt M., Jersie-christensens, Rosa Rakownikow, Olsen, Jesper V., Haile, James, Thomas, Jessica, Marean, Curtis W., Parkington, John, Presslee, Samantha, Lee-thorp, Julia, Ditchfield, Peter, Hamilton, Jacqueline F., Ward, Martyn W., Wang, Chunting Michelle, Shaw, Marvin D., Harrison, Terry, Dominguez-rodrigo, Manuel, Macphee, Ross De, Kwekason, Amandus, Ecker, Michaels, Horwitz, Liora Kolska, Chazan, Michael, Kröger, Roland, Thomas-oates, Jane, Harding, John H., Cappellini, Enrico, Penkman, Kirsty, Collins, Matthew J., Demarchi, Beatrice, Hall, Shaun, Roncal-herrero, Teresa, Freeman, Colin L., Woolley, Jos, Crisp, Molly K., Wilson, Julie, Fotakis, Anna, Fischer, Roman, Kessler, Benedikt M., Jersie-christensens, Rosa Rakownikow, Olsen, Jesper V., Haile, James, Thomas, Jessica, Marean, Curtis W., Parkington, John, Presslee, Samantha, Lee-thorp, Julia, Ditchfield, Peter, Hamilton, Jacqueline F., Ward, Martyn W., Wang, Chunting Michelle, Shaw, Marvin D., Harrison, Terry, Dominguez-rodrigo, Manuel, Macphee, Ross De, Kwekason, Amandus, Ecker, Michaels, Horwitz, Liora Kolska, Chazan, Michael, Kröger, Roland, Thomas-oates, Jane, Harding, John H., Cappellini, Enrico, Penkman, Kirsty, and Collins, Matthew J.

Abstract

Proteins persist longer in the fossil record than DNA, but the longevity, survival mechanisms and substrates remain contested. Here, we demonstrate the role of mineral binding in preserving the protein sequence in ostrich (Struthionidae) eggshell, including from thepalaeontological sites of Laetoli (3.8 Ma) and Olduvai Gorge (1.3 Ma) in Tanzania. By tracking protein diagenesis back in time we find consistent patterns of preservation, demonstrating authenticity of the surviving sequences. Molecular dynamics simulations of struthiocalcin-1 and -2, the dominant proteins within the eggshell, reveal that distinct domains bind to the mineral surface. It is the domain with the strongest calculated binding energy to the calcite surface that is selectively preserved. Thermal age calculations demonstrate that the Laetoli and Olduvai peptides are 50 times older than any previously authenticated sequence (equivalent to similar to 16 Ma at a constant 10 degrees C).

Published
2016
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23. Protein sequences bound to mineral surfaces persist into deep time

Author

Demarchi, Beatrice, primary, Hall, Shaun, additional, Roncal-Herrero, Teresa, additional, Freeman, Colin L, additional, Woolley, Jos, additional, Crisp, Molly K, additional, Wilson, Julie, additional, Fotakis, Anna, additional, Fischer, Roman, additional, Kessler, Benedikt M, additional, Rakownikow Jersie-Christensen, Rosa, additional, Olsen, Jesper V, additional, Haile, James, additional, Thomas, Jessica, additional, Marean, Curtis W, additional, Parkington, John, additional, Presslee, Samantha, additional, Lee-Thorp, Julia, additional, Ditchfield, Peter, additional, Hamilton, Jacqueline F, additional, Ward, Martyn W, additional, Wang, Chunting Michelle, additional, Shaw, Marvin D, additional, Harrison, Terry, additional, Domínguez-Rodrigo, Manuel, additional, MacPhee, Ross DE, additional, Kwekason, Amandus, additional, Ecker, Michaela, additional, Kolska Horwitz, Liora, additional, Chazan, Michael, additional, Kröger, Roland, additional, Thomas-Oates, Jane, additional, Harding, John H, additional, Cappellini, Enrico, additional, Penkman, Kirsty, additional, and Collins, Matthew J, additional

Published
2016
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24. Author response: Protein sequences bound to mineral surfaces persist into deep time

Author

Demarchi, Beatrice, primary, Hall, Shaun, additional, Roncal-Herrero, Teresa, additional, Freeman, Colin L, additional, Woolley, Jos, additional, Crisp, Molly K, additional, Wilson, Julie, additional, Fotakis, Anna, additional, Fischer, Roman, additional, Kessler, Benedikt M, additional, Rakownikow Jersie-Christensen, Rosa, additional, Olsen, Jesper V, additional, Haile, James, additional, Thomas, Jessica, additional, Marean, Curtis W, additional, Parkington, John, additional, Presslee, Samantha, additional, Lee-Thorp, Julia, additional, Ditchfield, Peter, additional, Hamilton, Jacqueline F, additional, Ward, Martyn W, additional, Wang, Chunting Michelle, additional, Shaw, Marvin D, additional, Harrison, Terry, additional, Domínguez-Rodrigo, Manuel, additional, MacPhee, Ross DE, additional, Kwekason, Amandus, additional, Ecker, Michaela, additional, Kolska Horwitz, Liora, additional, Chazan, Michael, additional, Kröger, Roland, additional, Thomas-Oates, Jane, additional, Harding, John H, additional, Cappellini, Enrico, additional, Penkman, Kirsty, additional, and Collins, Matthew J, additional

Published
2016
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25. Middle and Later Stone Age chronology of Kisese II rockshelter (UNESCO World Heritage Kondoa Rock-Art Sites), Tanzania

Author

Tryon, Christian A., Lewis, Jason E., Ranhorn, Kathryn L., Kwekason, Amandus, Alex, Bridget, Laird, Myra F., Marean, Curtis W., Niespolo, Elizabeth, Nivens, Joelle, and Mabulla, Audax Z. P.

Subjects
Social Sciences, Archaeology, Archaeological Dating, Radioactive Carbon Dating, Chemical Characterization, Isotope Analysis, Anthropology, Paleoanthropology, Biology and Life Sciences, Paleontology, Earth Sciences, Physical Anthropology, Geology, Stratigraphy, Organisms, Eukaryota, Animals, Vertebrates, Amniotes, Birds, Ostriches, People and Places, Geographical Locations, Africa, Geologic Time, Cenozoic Era, Quaternary Period, Holocene Epoch
Abstract

The archaeology of East Africa during the last ~65,000 years plays a central role in debates about the origins and dispersal of modern humans, Homo sapiens. Despite the historical importance of the region to these discussions, reliable chronologies for the nature, tempo, and timing of human behavioral changes seen among Middle Stone Age (MSA) and Later Stone Age (LSA) archaeological assemblages are sparse. The Kisese II rockshelter in the Kondoa region of Tanzania, originally excavated in 1956, preserves a ≥ 6-m-thick archaeological succession that spans the MSA/LSA transition, with lithic artifacts such as Levallois and bladelet cores and backed microliths, the recurrent use of red ochre, and >5,000 ostrich eggshell beads and bead fragments. Twenty-nine radiocarbon dates on ostrich eggshell carbonate make Kisese II one of the most robust chronological sequences for understanding archaeological change over the last ~47,000 years in East Africa. In particular, ostrich eggshell beads and backed microliths appear by 46–42 ka cal BP and occur throughout overlying Late Pleistocene and Holocene strata. Changes in lithic technology suggest an MSA/LSA transition that began 39–34.3 ka, with typical LSA technologies in place by the Last Glacial Maximum. The timing of these changes demonstrates the time-transgressive nature of behavioral innovations often linked to the origins of modern humans, even within a single region of Africa.

Published
2018
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