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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Synergistic roles of climate warming and human occupation in Patagonian megafaunal extinctions during the Last Deglaciation</title><author><name sortKey="Metcalf, Jessica L" sort="Metcalf, Jessica L" uniqKey="Metcalf J" first="Jessica L." last="Metcalf">Jessica L. Metcalf</name><affiliation><nlm:aff id="aff1">Australian Centre for Ancient DNA, School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</nlm:aff></affiliation><affiliation><nlm:aff id="aff2">Department of Ecology and Evolutionary Biology, Ramaley Biology, University of Colorado, Boulder, CO 80309–0334, USA.</nlm:aff></affiliation></author><author><name sortKey="Turney, Chris" sort="Turney, Chris" uniqKey="Turney C" first="Chris" last="Turney">Chris Turney</name><affiliation><nlm:aff id="aff3">Climate Change Research Centre, School of Biological, Earth, and Environmental Sciences, University of New South Wales, Sydney, Australia.</nlm:aff></affiliation></author><author><name sortKey="Barnett, Ross" sort="Barnett, Ross" uniqKey="Barnett R" first="Ross" last="Barnett">Ross Barnett</name><affiliation><nlm:aff id="aff4">Henry Wellcome Ancient Biomolecules Centre, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK.</nlm:aff></affiliation><affiliation><nlm:aff id="aff5">Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark.</nlm:aff></affiliation></author><author><name sortKey="Martin, Fabiana" sort="Martin, Fabiana" uniqKey="Martin F" first="Fabiana" last="Martin">Fabiana Martin</name><affiliation><nlm:aff id="aff6">Centro de Estudios del Hombre Austral, Instituto de la Patagonia, UMAG, Avenida Bulnes 01890, Punta Arenas, Chile.</nlm:aff></affiliation></author><author><name sortKey="Bray, Sarah C" sort="Bray, Sarah C" uniqKey="Bray S" first="Sarah C." last="Bray">Sarah C. Bray</name><affiliation><nlm:aff id="aff1">Australian Centre for Ancient DNA, School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</nlm:aff></affiliation><affiliation><nlm:aff id="aff7">Acute Leukaemia Laboratory, Centre for Cancer Biology, University of South Australia, Adelaide South Australia 5001, Australia.</nlm:aff></affiliation></author><author><name sortKey="Vilstrup, Julia T" sort="Vilstrup, Julia T" uniqKey="Vilstrup J" first="Julia T." last="Vilstrup">Julia T. Vilstrup</name><affiliation><nlm:aff id="aff5">Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark.</nlm:aff></affiliation></author><author><name sortKey="Orlando, Ludovic" sort="Orlando, Ludovic" uniqKey="Orlando L" first="Ludovic" last="Orlando">Ludovic Orlando</name><affiliation><nlm:aff id="aff5">Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark.</nlm:aff></affiliation></author><author><name sortKey="Salas Gismondi, Rodolfo" sort="Salas Gismondi, Rodolfo" uniqKey="Salas Gismondi R" first="Rodolfo" last="Salas-Gismondi">Rodolfo Salas-Gismondi</name><affiliation><nlm:aff id="aff8">Institut des Sciences de l’Evolution, Université de Montpellier, CNRS, IRD, EPHE, Montpellier 34095, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff9">Departamento de Paleontologia de Vertebrados, Museo de Historia Natural, UNMSM, Avenida Arenales 1256, Lima 14, Peru.</nlm:aff></affiliation></author><author><name sortKey="Loponte, Daniel" sort="Loponte, Daniel" uniqKey="Loponte D" first="Daniel" last="Loponte">Daniel Loponte</name><affiliation><nlm:aff id="aff10">Instituto Nacional de Antropología y Pensamiento Latinoamericano, C1426BJN Ciudad de Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Medina, Matias" sort="Medina, Matias" uniqKey="Medina M" first="Matías" last="Medina">Matías Medina</name><affiliation><nlm:aff id="aff11">Área de Arqueología y Etnohistoria, Centro de Estudios Históricos “Prof. Carlos S.A. Segreti,” Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Miguel C. del Corro 308, Córdoba (5000), Argentina.</nlm:aff></affiliation></author><author><name sortKey="De Nigris, Mariana" sort="De Nigris, Mariana" uniqKey="De Nigris M" first="Mariana" last="De Nigris">Mariana De Nigris</name><affiliation><nlm:aff id="aff12">Instituto Nacional de Antropología y Pensamiento Latinoamericano (INAPL), CONICET/UBA, 3 de Febrero 1370, C1426BJN Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Civalero, Teresa" sort="Civalero, Teresa" uniqKey="Civalero T" first="Teresa" last="Civalero">Teresa Civalero</name><affiliation><nlm:aff id="aff12">Instituto Nacional de Antropología y Pensamiento Latinoamericano (INAPL), CONICET/UBA, 3 de Febrero 1370, C1426BJN Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Fernandez, Pablo Marcelo" sort="Fernandez, Pablo Marcelo" uniqKey="Fernandez P" first="Pablo Marcelo" last="Fernández">Pablo Marcelo Fernández</name><affiliation><nlm:aff id="aff12">Instituto Nacional de Antropología y Pensamiento Latinoamericano (INAPL), CONICET/UBA, 3 de Febrero 1370, C1426BJN Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Gasco, Alejandra" sort="Gasco, Alejandra" uniqKey="Gasco A" first="Alejandra" last="Gasco">Alejandra Gasco</name><affiliation><nlm:aff id="aff13">CONICET, Laboratorio de Paleoecología Humana, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Duran, Victor" sort="Duran, Victor" uniqKey="Duran V" first="Victor" last="Duran">Victor Duran</name><affiliation><nlm:aff id="aff13">CONICET, Laboratorio de Paleoecología Humana, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Seymour, Kevin L" sort="Seymour, Kevin L" uniqKey="Seymour K" first="Kevin L." last="Seymour">Kevin L. Seymour</name><affiliation><nlm:aff id="aff14">Department of Natural History, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario M5S 2C6, Canada.</nlm:aff></affiliation></author><author><name sortKey="Otaola, Clara" sort="Otaola, Clara" uniqKey="Otaola C" first="Clara" last="Otaola">Clara Otaola</name><affiliation><nlm:aff id="aff15">CONICET-IANGLA Grupo Vincualdo San Rafael/ UTN-MHNSR, Parque Mariano Moreno (5600), San Rafael, Mendoza, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Gil, Adolfo" sort="Gil, Adolfo" uniqKey="Gil A" first="Adolfo" last="Gil">Adolfo Gil</name><affiliation><nlm:aff id="aff15">CONICET-IANGLA Grupo Vincualdo San Rafael/ UTN-MHNSR, Parque Mariano Moreno (5600), San Rafael, Mendoza, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Paunero, Rafael" sort="Paunero, Rafael" uniqKey="Paunero R" first="Rafael" last="Paunero">Rafael Paunero</name><affiliation><nlm:aff id="aff16">Departamento Científico de Arqueología. Facultad de Ciencias Naturales y Museo, UNLP, Avenida Paseo del Bosque s/n (1900), La Plata, Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Prevosti, Francisco J" sort="Prevosti, Francisco J" uniqKey="Prevosti F" first="Francisco J." last="Prevosti">Francisco J. Prevosti</name><affiliation><nlm:aff id="aff17">Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), Provincia de La Rioja, UNLaR, SEGEMAR, UNCa, CONICET, Entre Ríos y Mendoza s/n, (5301), Anillaco, La Rioja, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Bradshaw, Corey J A" sort="Bradshaw, Corey J A" uniqKey="Bradshaw C" first="Corey J. A." last="Bradshaw">Corey J. A. Bradshaw</name><affiliation><nlm:aff id="aff18">School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</nlm:aff></affiliation></author><author><name sortKey="Wheeler, Jane C" sort="Wheeler, Jane C" uniqKey="Wheeler J" first="Jane C." last="Wheeler">Jane C. Wheeler</name><affiliation><nlm:aff id="aff19">CONOPA, Instituto de Investigación y Desarrollo de Camélidos Sudamericanos, Lima, Peru.</nlm:aff></affiliation></author><author><name sortKey="Borrero, Luis" sort="Borrero, Luis" uniqKey="Borrero L" first="Luis" last="Borrero">Luis Borrero</name><affiliation><nlm:aff id="aff20">CONICET-IMHICIHU, Universidad de Buenos Aires. Saavedra 15, 5 (1083 ACA), Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Austin, Jeremy J" sort="Austin, Jeremy J" uniqKey="Austin J" first="Jeremy J." last="Austin">Jeremy J. Austin</name><affiliation><nlm:aff id="aff1">Australian Centre for Ancient DNA, School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</nlm:aff></affiliation></author><author><name sortKey="Cooper, Alan" sort="Cooper, Alan" uniqKey="Cooper A" first="Alan" last="Cooper">Alan Cooper</name><affiliation><nlm:aff id="aff1">Australian Centre for Ancient DNA, School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</nlm:aff></affiliation><affiliation><nlm:aff id="aff4">Henry Wellcome Ancient Biomolecules Centre, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK.</nlm:aff></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">27386563</idno><idno type="pmc">4928889</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4928889</idno><idno type="RBID">PMC:4928889</idno><idno type="doi">10.1126/sciadv.1501682</idno><date when="2016">2016</date><idno type="wicri:Area/Pmc/Corpus">000638</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000638</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Synergistic roles of climate warming and human occupation in Patagonian megafaunal extinctions during the Last Deglaciation</title><author><name sortKey="Metcalf, Jessica L" sort="Metcalf, Jessica L" uniqKey="Metcalf J" first="Jessica L." last="Metcalf">Jessica L. Metcalf</name><affiliation><nlm:aff id="aff1">Australian Centre for Ancient DNA, School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</nlm:aff></affiliation><affiliation><nlm:aff id="aff2">Department of Ecology and Evolutionary Biology, Ramaley Biology, University of Colorado, Boulder, CO 80309–0334, USA.</nlm:aff></affiliation></author><author><name sortKey="Turney, Chris" sort="Turney, Chris" uniqKey="Turney C" first="Chris" last="Turney">Chris Turney</name><affiliation><nlm:aff id="aff3">Climate Change Research Centre, School of Biological, Earth, and Environmental Sciences, University of New South Wales, Sydney, Australia.</nlm:aff></affiliation></author><author><name sortKey="Barnett, Ross" sort="Barnett, Ross" uniqKey="Barnett R" first="Ross" last="Barnett">Ross Barnett</name><affiliation><nlm:aff id="aff4">Henry Wellcome Ancient Biomolecules Centre, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK.</nlm:aff></affiliation><affiliation><nlm:aff id="aff5">Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark.</nlm:aff></affiliation></author><author><name sortKey="Martin, Fabiana" sort="Martin, Fabiana" uniqKey="Martin F" first="Fabiana" last="Martin">Fabiana Martin</name><affiliation><nlm:aff id="aff6">Centro de Estudios del Hombre Austral, Instituto de la Patagonia, UMAG, Avenida Bulnes 01890, Punta Arenas, Chile.</nlm:aff></affiliation></author><author><name sortKey="Bray, Sarah C" sort="Bray, Sarah C" uniqKey="Bray S" first="Sarah C." last="Bray">Sarah C. Bray</name><affiliation><nlm:aff id="aff1">Australian Centre for Ancient DNA, School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</nlm:aff></affiliation><affiliation><nlm:aff id="aff7">Acute Leukaemia Laboratory, Centre for Cancer Biology, University of South Australia, Adelaide South Australia 5001, Australia.</nlm:aff></affiliation></author><author><name sortKey="Vilstrup, Julia T" sort="Vilstrup, Julia T" uniqKey="Vilstrup J" first="Julia T." last="Vilstrup">Julia T. Vilstrup</name><affiliation><nlm:aff id="aff5">Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark.</nlm:aff></affiliation></author><author><name sortKey="Orlando, Ludovic" sort="Orlando, Ludovic" uniqKey="Orlando L" first="Ludovic" last="Orlando">Ludovic Orlando</name><affiliation><nlm:aff id="aff5">Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark.</nlm:aff></affiliation></author><author><name sortKey="Salas Gismondi, Rodolfo" sort="Salas Gismondi, Rodolfo" uniqKey="Salas Gismondi R" first="Rodolfo" last="Salas-Gismondi">Rodolfo Salas-Gismondi</name><affiliation><nlm:aff id="aff8">Institut des Sciences de l’Evolution, Université de Montpellier, CNRS, IRD, EPHE, Montpellier 34095, France.</nlm:aff></affiliation><affiliation><nlm:aff id="aff9">Departamento de Paleontologia de Vertebrados, Museo de Historia Natural, UNMSM, Avenida Arenales 1256, Lima 14, Peru.</nlm:aff></affiliation></author><author><name sortKey="Loponte, Daniel" sort="Loponte, Daniel" uniqKey="Loponte D" first="Daniel" last="Loponte">Daniel Loponte</name><affiliation><nlm:aff id="aff10">Instituto Nacional de Antropología y Pensamiento Latinoamericano, C1426BJN Ciudad de Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Medina, Matias" sort="Medina, Matias" uniqKey="Medina M" first="Matías" last="Medina">Matías Medina</name><affiliation><nlm:aff id="aff11">Área de Arqueología y Etnohistoria, Centro de Estudios Históricos “Prof. Carlos S.A. Segreti,” Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Miguel C. del Corro 308, Córdoba (5000), Argentina.</nlm:aff></affiliation></author><author><name sortKey="De Nigris, Mariana" sort="De Nigris, Mariana" uniqKey="De Nigris M" first="Mariana" last="De Nigris">Mariana De Nigris</name><affiliation><nlm:aff id="aff12">Instituto Nacional de Antropología y Pensamiento Latinoamericano (INAPL), CONICET/UBA, 3 de Febrero 1370, C1426BJN Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Civalero, Teresa" sort="Civalero, Teresa" uniqKey="Civalero T" first="Teresa" last="Civalero">Teresa Civalero</name><affiliation><nlm:aff id="aff12">Instituto Nacional de Antropología y Pensamiento Latinoamericano (INAPL), CONICET/UBA, 3 de Febrero 1370, C1426BJN Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Fernandez, Pablo Marcelo" sort="Fernandez, Pablo Marcelo" uniqKey="Fernandez P" first="Pablo Marcelo" last="Fernández">Pablo Marcelo Fernández</name><affiliation><nlm:aff id="aff12">Instituto Nacional de Antropología y Pensamiento Latinoamericano (INAPL), CONICET/UBA, 3 de Febrero 1370, C1426BJN Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Gasco, Alejandra" sort="Gasco, Alejandra" uniqKey="Gasco A" first="Alejandra" last="Gasco">Alejandra Gasco</name><affiliation><nlm:aff id="aff13">CONICET, Laboratorio de Paleoecología Humana, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Duran, Victor" sort="Duran, Victor" uniqKey="Duran V" first="Victor" last="Duran">Victor Duran</name><affiliation><nlm:aff id="aff13">CONICET, Laboratorio de Paleoecología Humana, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Seymour, Kevin L" sort="Seymour, Kevin L" uniqKey="Seymour K" first="Kevin L." last="Seymour">Kevin L. Seymour</name><affiliation><nlm:aff id="aff14">Department of Natural History, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario M5S 2C6, Canada.</nlm:aff></affiliation></author><author><name sortKey="Otaola, Clara" sort="Otaola, Clara" uniqKey="Otaola C" first="Clara" last="Otaola">Clara Otaola</name><affiliation><nlm:aff id="aff15">CONICET-IANGLA Grupo Vincualdo San Rafael/ UTN-MHNSR, Parque Mariano Moreno (5600), San Rafael, Mendoza, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Gil, Adolfo" sort="Gil, Adolfo" uniqKey="Gil A" first="Adolfo" last="Gil">Adolfo Gil</name><affiliation><nlm:aff id="aff15">CONICET-IANGLA Grupo Vincualdo San Rafael/ UTN-MHNSR, Parque Mariano Moreno (5600), San Rafael, Mendoza, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Paunero, Rafael" sort="Paunero, Rafael" uniqKey="Paunero R" first="Rafael" last="Paunero">Rafael Paunero</name><affiliation><nlm:aff id="aff16">Departamento Científico de Arqueología. Facultad de Ciencias Naturales y Museo, UNLP, Avenida Paseo del Bosque s/n (1900), La Plata, Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Prevosti, Francisco J" sort="Prevosti, Francisco J" uniqKey="Prevosti F" first="Francisco J." last="Prevosti">Francisco J. Prevosti</name><affiliation><nlm:aff id="aff17">Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), Provincia de La Rioja, UNLaR, SEGEMAR, UNCa, CONICET, Entre Ríos y Mendoza s/n, (5301), Anillaco, La Rioja, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Bradshaw, Corey J A" sort="Bradshaw, Corey J A" uniqKey="Bradshaw C" first="Corey J. A." last="Bradshaw">Corey J. A. Bradshaw</name><affiliation><nlm:aff id="aff18">School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</nlm:aff></affiliation></author><author><name sortKey="Wheeler, Jane C" sort="Wheeler, Jane C" uniqKey="Wheeler J" first="Jane C." last="Wheeler">Jane C. Wheeler</name><affiliation><nlm:aff id="aff19">CONOPA, Instituto de Investigación y Desarrollo de Camélidos Sudamericanos, Lima, Peru.</nlm:aff></affiliation></author><author><name sortKey="Borrero, Luis" sort="Borrero, Luis" uniqKey="Borrero L" first="Luis" last="Borrero">Luis Borrero</name><affiliation><nlm:aff id="aff20">CONICET-IMHICIHU, Universidad de Buenos Aires. Saavedra 15, 5 (1083 ACA), Buenos Aires, Argentina.</nlm:aff></affiliation></author><author><name sortKey="Austin, Jeremy J" sort="Austin, Jeremy J" uniqKey="Austin J" first="Jeremy J." last="Austin">Jeremy J. Austin</name><affiliation><nlm:aff id="aff1">Australian Centre for Ancient DNA, School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</nlm:aff></affiliation></author><author><name sortKey="Cooper, Alan" sort="Cooper, Alan" uniqKey="Cooper A" first="Alan" last="Cooper">Alan Cooper</name><affiliation><nlm:aff id="aff1">Australian Centre for Ancient DNA, School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</nlm:aff></affiliation><affiliation><nlm:aff id="aff4">Henry Wellcome Ancient Biomolecules Centre, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK.</nlm:aff></affiliation></author></analytic><series><title level="j">Science Advances</title><idno type="eISSN">2375-2548</idno><imprint><date when="2016">2016</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Patagonian megafaunal extinctions reveal synergistic roles of climate change and human impacts.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Bird, J" uniqKey="Bird J">J. 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Sci Adv</journal-id><journal-id journal-id-type="iso-abbrev">Sci Adv</journal-id><journal-id journal-id-type="publisher-id">SciAdv</journal-id><journal-id journal-id-type="hwp">advances</journal-id><journal-title-group><journal-title>Science Advances</journal-title></journal-title-group><issn pub-type="epub">2375-2548</issn><publisher><publisher-name>American Association for the Advancement of Science</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">27386563</article-id><article-id pub-id-type="pmc">4928889</article-id><article-id pub-id-type="publisher-id">1501682</article-id><article-id pub-id-type="doi">10.1126/sciadv.1501682</article-id><article-categories><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group><subj-group subj-group-type="heading"><subject>Research Articles</subject></subj-group><subj-group subj-group-type="legacy-article-type"><subject>SciAdv r-articles</subject></subj-group><subj-group subj-group-type="overline"><subject>Ecology</subject></subj-group></article-categories><title-group><article-title>Synergistic roles of climate warming and human occupation in Patagonian megafaunal extinctions during the Last Deglaciation</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Metcalf</surname><given-names>Jessica L.</given-names></name><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0001-8374-8046</contrib-id><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="aff" rid="aff2"><sup>2</sup></xref></contrib><contrib contrib-type="author"><name><surname>Turney</surname><given-names>Chris</given-names></name><xref ref-type="aff" rid="aff3"><sup>3</sup></xref><xref ref-type="author-notes" rid="afn1">*</xref></contrib><contrib contrib-type="author"><name><surname>Barnett</surname><given-names>Ross</given-names></name><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0003-4023-0284</contrib-id><xref ref-type="aff" rid="aff4"><sup>4</sup></xref><xref ref-type="aff" rid="aff5"><sup>5</sup></xref><xref ref-type="author-notes" rid="afn1">*</xref></contrib><contrib contrib-type="author"><name><surname>Martin</surname><given-names>Fabiana</given-names></name><xref ref-type="aff" rid="aff6"><sup>6</sup></xref></contrib><contrib contrib-type="author"><name><surname>Bray</surname><given-names>Sarah C.</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="aff" rid="aff7"><sup>7</sup></xref></contrib><contrib contrib-type="author"><name><surname>Vilstrup</surname><given-names>Julia T.</given-names></name><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0001-6534-8452</contrib-id><xref ref-type="aff" rid="aff5"><sup>5</sup></xref></contrib><contrib contrib-type="author"><name><surname>Orlando</surname><given-names>Ludovic</given-names></name><xref ref-type="aff" rid="aff5"><sup>5</sup></xref></contrib><contrib contrib-type="author"><name><surname>Salas-Gismondi</surname><given-names>Rodolfo</given-names></name><xref ref-type="aff" rid="aff8"><sup>8</sup></xref><xref ref-type="aff" rid="aff9"><sup>9</sup></xref></contrib><contrib contrib-type="author"><name><surname>Loponte</surname><given-names>Daniel</given-names></name><xref ref-type="aff" rid="aff10"><sup>10</sup></xref></contrib><contrib contrib-type="author"><name><surname>Medina</surname><given-names>Matías</given-names></name><xref ref-type="aff" rid="aff11"><sup>11</sup></xref></contrib><contrib contrib-type="author"><name><surname>De Nigris</surname><given-names>Mariana</given-names></name><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0002-8659-9725</contrib-id><xref ref-type="aff" rid="aff12"><sup>12</sup></xref></contrib><contrib contrib-type="author"><name><surname>Civalero</surname><given-names>Teresa</given-names></name><xref ref-type="aff" rid="aff12"><sup>12</sup></xref></contrib><contrib contrib-type="author"><name><surname>Fernández</surname><given-names>Pablo Marcelo</given-names></name><xref ref-type="aff" rid="aff12"><sup>12</sup></xref></contrib><contrib contrib-type="author"><name><surname>Gasco</surname><given-names>Alejandra</given-names></name><xref ref-type="aff" rid="aff13"><sup>13</sup></xref></contrib><contrib contrib-type="author"><name><surname>Duran</surname><given-names>Victor</given-names></name><xref ref-type="aff" rid="aff13"><sup>13</sup></xref></contrib><contrib contrib-type="author"><name><surname>Seymour</surname><given-names>Kevin L.</given-names></name><xref ref-type="aff" rid="aff14"><sup>14</sup></xref></contrib><contrib contrib-type="author"><name><surname>Otaola</surname><given-names>Clara</given-names></name><xref ref-type="aff" rid="aff15"><sup>15</sup></xref></contrib><contrib contrib-type="author"><name><surname>Gil</surname><given-names>Adolfo</given-names></name><xref ref-type="aff" rid="aff15"><sup>15</sup></xref></contrib><contrib contrib-type="author"><name><surname>Paunero</surname><given-names>Rafael</given-names></name><xref ref-type="aff" rid="aff16"><sup>16</sup></xref></contrib><contrib contrib-type="author"><name><surname>Prevosti</surname><given-names>Francisco J.</given-names></name><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0003-0511-4720</contrib-id><xref ref-type="aff" rid="aff17"><sup>17</sup></xref></contrib><contrib contrib-type="author"><name><surname>Bradshaw</surname><given-names>Corey J. A.</given-names></name><xref ref-type="aff" rid="aff18"><sup>18</sup></xref></contrib><contrib contrib-type="author"><name><surname>Wheeler</surname><given-names>Jane C.</given-names></name><contrib-id contrib-id-type="orcid" authenticated="false">http://orcid.org/0000-0001-9020-0660</contrib-id><xref ref-type="aff" rid="aff19"><sup>19</sup></xref></contrib><contrib contrib-type="author"><name><surname>Borrero</surname><given-names>Luis</given-names></name><xref ref-type="aff" rid="aff20"><sup>20</sup></xref></contrib><contrib contrib-type="author"><name><surname>Austin</surname><given-names>Jeremy J.</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref></contrib><contrib contrib-type="author"><name><surname>Cooper</surname><given-names>Alan</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref><xref ref-type="aff" rid="aff4"><sup>4</sup></xref><xref ref-type="corresp" rid="cor1">†</xref></contrib><aff id="aff1"><label>1</label>Australian Centre for Ancient DNA, School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</aff><aff id="aff2"><label>2</label>Department of Ecology and Evolutionary Biology, Ramaley Biology, University of Colorado, Boulder, CO 80309–0334, USA.</aff><aff id="aff3"><label>3</label>Climate Change Research Centre, School of Biological, Earth, and Environmental Sciences, University of New South Wales, Sydney, Australia.</aff><aff id="aff4"><label>4</label>Henry Wellcome Ancient Biomolecules Centre, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK.</aff><aff id="aff5"><label>5</label>Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5–7, DK-1350 Copenhagen, Denmark.</aff><aff id="aff6"><label>6</label>Centro de Estudios del Hombre Austral, Instituto de la Patagonia, UMAG, Avenida Bulnes 01890, Punta Arenas, Chile.</aff><aff id="aff7"><label>7</label>Acute Leukaemia Laboratory, Centre for Cancer Biology, University of South Australia, Adelaide South Australia 5001, Australia.</aff><aff id="aff8"><label>8</label>Institut des Sciences de l’Evolution, Université de Montpellier, CNRS, IRD, EPHE, Montpellier 34095, France.</aff><aff id="aff9"><label>9</label>Departamento de Paleontologia de Vertebrados, Museo de Historia Natural, UNMSM, Avenida Arenales 1256, Lima 14, Peru.</aff><aff id="aff10"><label>10</label>Instituto Nacional de Antropología y Pensamiento Latinoamericano, C1426BJN Ciudad de Buenos Aires, Argentina.</aff><aff id="aff11"><label>11</label>Área de Arqueología y Etnohistoria, Centro de Estudios Históricos “Prof. Carlos S.A. Segreti,” Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Miguel C. del Corro 308, Córdoba (5000), Argentina.</aff><aff id="aff12"><label>12</label>Instituto Nacional de Antropología y Pensamiento Latinoamericano (INAPL), CONICET/UBA, 3 de Febrero 1370, C1426BJN Buenos Aires, Argentina.</aff><aff id="aff13"><label>13</label>CONICET, Laboratorio de Paleoecología Humana, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina.</aff><aff id="aff14"><label>14</label>Department of Natural History, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario M5S 2C6, Canada.</aff><aff id="aff15"><label>15</label>CONICET-IANGLA Grupo Vincualdo San Rafael/ UTN-MHNSR, Parque Mariano Moreno (5600), San Rafael, Mendoza, Argentina.</aff><aff id="aff16"><label>16</label>Departamento Científico de Arqueología. Facultad de Ciencias Naturales y Museo, UNLP, Avenida Paseo del Bosque s/n (1900), La Plata, Buenos Aires, Argentina.</aff><aff id="aff17"><label>17</label>Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja (CRILAR), Provincia de La Rioja, UNLaR, SEGEMAR, UNCa, CONICET, Entre Ríos y Mendoza s/n, (5301), Anillaco, La Rioja, Argentina.</aff><aff id="aff18"><label>18</label>School of Biological Sciences, University of Adelaide, Adelaide, South Australia 5005, Australia.</aff><aff id="aff19"><label>19</label>CONOPA, Instituto de Investigación y Desarrollo de Camélidos Sudamericanos, Lima, Peru.</aff><aff id="aff20"><label>20</label>CONICET-IMHICIHU, Universidad de Buenos Aires. Saavedra 15, 5 (1083 ACA), Buenos Aires, Argentina.</aff></contrib-group><author-notes><fn id="afn1" fn-type="equal"><label>*</label><p>These authors contributed equally to this work.</p></fn><corresp id="cor1"><label>†</label>Corresponding author. Email: <email xlink:href="alan.cooper@adelaide.edu.au">alan.cooper@adelaide.edu.au</email></corresp></author-notes><pub-date pub-type="collection"><month>6</month><year>2016</year></pub-date><pub-date pub-type="epub"><day>17</day><month>6</month><year>2016</year></pub-date><volume>2</volume><issue>6</issue><elocation-id>e1501682</elocation-id><history><date date-type="received"><day>21</day><month>11</month><year>2015</year></date><date date-type="accepted"><day>27</day><month>5</month><year>2016</year></date></history><permissions><copyright-statement>Copyright © 2016, The Authors</copyright-statement><copyright-year>2016</copyright-year><copyright-holder>The Authors</copyright-holder><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc/4.0/" id="p-2"><license-p>This is an open-access article distributed under the terms of the <ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by-nc/4.0/">Creative Commons Attribution-NonCommercial license</ext-link>, which permits use, distribution, and reproduction in any medium, so long as the resultant use is <bold>not</bold> for commercial advantage and provided the original work is properly cited.</license-p></license></permissions><abstract abstract-type="teaser"><p>Patagonian megafaunal extinctions reveal synergistic roles of climate change and human impacts.</p></abstract><abstract><p>The causes of Late Pleistocene megafaunal extinctions (60,000 to 11,650 years ago, hereafter 60 to 11.65 ka) remain contentious, with major phases coinciding with both human arrival and climate change around the world. The Americas provide a unique opportunity to disentangle these factors as human colonization took place over a narrow time frame (~15 to 14.6 ka) but during contrasting temperature trends across each continent. Unfortunately, limited data sets in South America have so far precluded detailed comparison. We analyze genetic and radiocarbon data from 89 and 71 Patagonian megafaunal bones, respectively, more than doubling the high-quality Pleistocene megafaunal radiocarbon data sets from the region. We identify a narrow megafaunal extinction phase 12,280 ± 110 years ago, some 1 to 3 thousand years after initial human presence in the area. Although humans arrived immediately prior to a cold phase, the Antarctic Cold Reversal stadial, megafaunal extinctions did not occur until the stadial finished and the subsequent warming phase commenced some 1 to 3 thousand years later. The increased resolution provided by the Patagonian material reveals that the sequence of climate and extinction events in North and South America were temporally inverted, but in both cases, megafaunal extinctions did not occur until human presence and climate warming coincided. Overall, metapopulation processes involving subpopulation connectivity on a continental scale appear to have been critical for megafaunal species survival of both climate change and human impacts.</p></abstract><kwd-group><title>Keywords</title><kwd>PATAGONIA</kwd><kwd>Pleistocene</kwd><kwd>megafauna</kwd><kwd>extinction</kwd><kwd>mitochondrial DNA</kwd><kwd>radiocarbon</kwd><kwd>climate</kwd><kwd>Antarctic Cold Reversal</kwd><kwd>human occupation</kwd><kwd>South America</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100000923</institution-id><institution>Australian Research Council</institution></institution-wrap></funding-source><award-id>ID0E5TDK8238</award-id><award-id>DP140104233</award-id><principal-award-recipient><name><surname>Cooper</surname><given-names>Alan</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100001732</institution-id><institution>Danmarks Grundforskningsfond (DK)</institution></institution-wrap></funding-source><award-id>ID0EUYDK8240</award-id><award-id>DNRF94</award-id><principal-award-recipient><name><surname>Orlando</surname><given-names>Ludovic</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100000270</institution-id><institution>Natural Environment Research Council</institution></institution-wrap></funding-source><award-id>ID0EV6DK8239</award-id><award-id>NER/B/S/2003/00181</award-id><principal-award-recipient><name><surname>Cooper</surname><given-names>Alan</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100000923</institution-id><institution>Australian Research Council</institution></institution-wrap></funding-source><award-id>ID0ELEEK8391</award-id><award-id>DP0664562</award-id><principal-award-recipient><name><surname>Cooper</surname><given-names>Alan</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100000268</institution-id><institution>Biotechnology and Biological Sciences Research Council</institution></institution-wrap></funding-source><award-id>ID0EBJEK8392</award-id><award-id>02/A1/G/08351</award-id><principal-award-recipient><name><surname>Barnett</surname><given-names>Ross</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100000923</institution-id><institution>Australian Research Council</institution></institution-wrap></funding-source><award-id>ID0EKQEK8393</award-id><award-id>FL140100260</award-id><principal-award-recipient><name><surname>Cooper</surname><given-names>Alan</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100000923</institution-id><institution>Australian Research Council</institution></institution-wrap></funding-source><award-id>ID0EAVEK8394</award-id><award-id>FT099233</award-id><principal-award-recipient><name><surname>Cooper</surname><given-names>Alan</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100000923</institution-id><institution>Australian Research Council</institution></institution-wrap></funding-source><award-id>ID0EWZEK8395</award-id><award-id>FL100100195</award-id><principal-award-recipient><name><surname>Turney</surname><given-names>Chris</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100000923</institution-id><institution>Australian Research Council</institution></institution-wrap></funding-source><award-id>ID0E45EK8396</award-id><award-id>DP130103842</award-id><principal-award-recipient><name><surname>Bradshaw</surname><given-names>Corey</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100000923</institution-id><institution>Australian Research Council</institution></institution-wrap></funding-source><award-id>ID0ERDFK8397</award-id><award-id>FT110100306</award-id><principal-award-recipient><name><surname>Bradshaw</surname><given-names>Corey</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100000923</institution-id><institution>Australian Research Council</institution></institution-wrap></funding-source><award-id>ID0EFIFK8398</award-id><award-id>FT10010010</award-id><principal-award-recipient><name><surname>Austin</surname><given-names>Jeremy J.</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution>Consejo Nacional de Investigaciones Científicas y Técnicas (AR)</institution></institution-wrap></funding-source><award-id>ID0ETMFK8399</award-id><award-id>PICT 2011-309</award-id><principal-award-recipient><name><surname>Martin</surname><given-names>Fabiana</given-names></name></principal-award-recipient></award-group><award-group><funding-source><institution-wrap><institution-id institution-id-type="FundRef">http://dx.doi.org/10.13039/501100002923</institution-id><institution>Consejo Nacional de Investigaciones Científicas y Técnicas</institution></institution-wrap></funding-source><award-id>ID0EJTFK8400</award-id><award-id>PIP 2011-164</award-id><principal-award-recipient><name><surname>Martin</surname><given-names>Fabiana</given-names></name></principal-award-recipient></award-group></funding-group><custom-meta-group><custom-meta><meta-name>Copyeditor</meta-name><meta-value>Mikee Bernabe</meta-value></custom-meta></custom-meta-group></article-meta></front><body><sec sec-type="introduction" disp-level="1"><title>INTRODUCTION</title><p>The loss of Late Pleistocene megafaunal diversity in South America was among the greatest of any continent (52 genera, 83%), and Fell’s Cave in Patagonia was one of the first sites globally where archaeological evidence of human hunting was associated with megafaunal remains (<xref rid="R1" ref-type="bibr"><italic>1</italic></xref>–<xref rid="R3" ref-type="bibr"><italic>3</italic></xref>). Despite this, the timing and nature of the South American megafaunal extinctions and the evolutionary relationships of many taxa remain poorly understood. Patagonia provides an ideal study area in this respect because of the excellent preservation of Late Pleistocene fossil remains compared to the rest of South America (<xref rid="R4" ref-type="bibr"><italic>4</italic></xref>, <xref rid="R5" ref-type="bibr"><italic>5</italic></xref>), and the broadly synchronous but antiphase climate changes to those in the Northern Hemisphere (commonly referred to as the bipolar seesaw) (<xref rid="R6" ref-type="bibr"><italic>6</italic></xref>, <xref rid="R7" ref-type="bibr"><italic>7</italic></xref>).</p><p>Following maximum glacial extent across the region 28.5 thousand years ago (ka) (<xref rid="R8" ref-type="bibr"><italic>8</italic></xref>), long-term warming from 18 ka to the Holocene was interrupted between ~14.4 and 12.7 ka by a marked 1700-year decline in temperature and glacial advance identified as the Antarctic Cold Reversal (ACR) stadial (<xref ref-type="fig" rid="F1">Fig. 1</xref>) (<xref rid="R7" ref-type="bibr"><italic>7</italic></xref>, <xref rid="R9" ref-type="bibr"><italic>9</italic></xref>). Glacial conditions persisted until ~12.6 ka, when rapid warming and retreat of the Patagonian Ice Sheet led to the expansion of <italic>Nothofagus</italic> forest ~12.3 ka, with peak Holocene warming attained by 11.4 ka (<xref rid="R10" ref-type="bibr"><italic>10</italic></xref>, <xref rid="R11" ref-type="bibr"><italic>11</italic></xref>). Crucially, the first records of human presence in southern Chile occur immediately prior to the ACR stadial, at Monte Verde near Puerto Montt on the western edge of Patagonia, before ~14.6 ka (<xref rid="R12" ref-type="bibr"><italic>12</italic></xref>, <xref rid="R13" ref-type="bibr"><italic>13</italic></xref>). The central plateau of northern Patagonia was occupied before ~13.2 ka (<xref rid="R14" ref-type="bibr"><italic>14</italic></xref>), with the first confirmed occupation in southern Patagonia between ~13.2 and 12.9 ka, and ~12.7 ka in Tierra del Fuego (<xref rid="R14" ref-type="bibr"><italic>14</italic></xref>, <xref rid="R15" ref-type="bibr"><italic>15</italic></xref>). In contrast to the relatively intense occupation of the central plateau, the first human occupations in southern Patagonia appear relatively ephemeral, with the number of sites and intensity of occupation increasing markedly from the early Holocene (<xref rid="R15" ref-type="bibr"><italic>15</italic></xref>, <xref rid="R16" ref-type="bibr"><italic>16</italic></xref>).</p><fig id="F1" fig-type="figure" orientation="portrait" position="float"><label>Fig. 1</label><caption><title>Extinction chronology of Pleistocene megafauna in southern Patagonia (9000 to 18,000 years ago), shown against West Antarctic Ice Sheet Divide ice δ<sup>18</sup>O record (bottom) and the timing of Antarctic Cold Reversal chronozone (blue column) (<xref rid="R9" ref-type="bibr"><italic>9</italic></xref>).</title><p>Calibrated radiocarbon (<sup>14</sup>C) ages of extinct megafaunal remains from Patagonia [open circles with 1σ uncertainty indicated by vertical whiskers] are shown with calculated Phase boundary start and end (extinction) estimates (filled red squares) using the Southern Hemisphere calibration (SHCal13) curve (<xref rid="R51" ref-type="bibr"><italic>51</italic></xref>) and OxCal 4.2 (<xref rid="R26" ref-type="bibr"><italic>26</italic></xref>). The vertical gray bar denotes the 1σ range for megafaunal extinction in Patagonia. Calibrated <sup>14</sup>C ages for the arrival of humans (with Monte Verde shown as “MV” with dashed line for extended age range) and modern lineage of <italic>L. guanicoe</italic> are shown as open circles and red square. (<bold>Top</bold>) A summary of the Northern Hemisphere climate and North American megafaunal extinctions is also presented. The Greenland δ<sup>18</sup>O and isotope event stratigraphy are shown (GS, Greenland Stadial; GI, Greenland Interstadial) (<xref rid="R60" ref-type="bibr"><italic>60</italic></xref>), with the summed probabilities (1σ) of the youngest <sup>14</sup>C dates for the latest Pleistocene megafaunal extinctions in North America (<xref rid="R27" ref-type="bibr"><italic>27</italic></xref>), using the IntCal13 calibration curve (<xref rid="R59" ref-type="bibr"><italic>59</italic></xref>). The tan and blue shading highlights the inverted timing of warm and cold intervals in the Northern Hemisphere and Southern Hemisphere during the Last Termination. WAIS, West Antarctic Ice Sheet; NGRIP, North Greenland Ice-Core Project.</p></caption><graphic xlink:href="1501682-F1"></graphic></fig><p>To characterize the extinction of the Late Pleistocene Patagonian megafauna, we sequenced mitochondrial DNA (mtDNA) from 89 megafaunal bone and teeth samples recovered from caves and rock shelters, and generated new accelerator mass spectrometry radiocarbon (AMS <sup>14</sup>C) dates for a total of 71 bone, teeth, and coprolite samples (tables S1 to S3). We then investigated whether the megafaunal extinctions were associated with major events in records of climate change and/or human occupation.</p></sec><sec sec-type="results" disp-level="1"><title>RESULTS</title><sec disp-level="2"><title>Phylogenetic relationships of Pleistocene megafauna</title><p>Phylogenetic analysis of the new genetic data (see the Supplementary Materials) reveals that the Late Pleistocene megafaunal extinctions contained several previously unknown events, including a distinct camelid species, <italic>Lama gracilis</italic> (<xref rid="R17" ref-type="bibr"><italic>17</italic></xref>), a previously unknown genetic clade of guanaco (<italic>Lama guanicoe</italic>) (<xref ref-type="fig" rid="F2">Fig. 2</xref>), and a genetically distinct giant South American jaguar subspecies, <italic>Panthera onca mesembrina</italic> (<xref rid="R18" ref-type="bibr"><italic>18</italic></xref>). In contrast, the single mitochondrial haplotype recovered from ancient southern Patagonian puma specimens (<italic>Puma concolor</italic>) appears closely related to haplotypes surviving in South America at present.</p><fig id="F2" fig-type="figure" orientation="portrait" position="float"><label>Fig. 2</label><caption><title>Mitochondrial DNA phylogenies of Late Pleistocene Patagonian megafauna (red) relative to extant taxa (black).</title><p>(<bold>A</bold>) Phylogenetic reconstructions of ancient and modern camelid sequences revealed two groups of camelids: <italic>Lama gracilis</italic> and a distinct clade of <italic>L. guanicoe</italic>. (<bold>B</bold>) Pleistocene <italic>Panthera onca</italic> were distinct from modern jaguars and represent the extinct subspecies <italic>P</italic><italic>. onca mesembrina</italic>. (<bold>C</bold>) In contrast, sequences from Pleistocene <italic>Puma concolor</italic> are closely related to modern haplotypes. All Pleistocene samples represent haplotypes that are extinct or unsampled in modern populations.</p></caption><graphic xlink:href="1501682-F2"></graphic></fig></sec><sec disp-level="2"><title>Extinction of Pleistocene megafauna and associations with human occupation and climate</title><p>We combined the newly dated specimens with previously published <sup>14</sup>C data of extinct megafauna, such as the large ground sloth (<italic>Mylodon darwinii</italic>) (<xref rid="R19" ref-type="bibr"><italic>19</italic></xref>, <xref rid="R20" ref-type="bibr"><italic>20</italic></xref>), the saber-toothed cat (<italic>Smilodon populator</italic>) (<xref rid="R21" ref-type="bibr"><italic>21</italic></xref>, <xref rid="R22" ref-type="bibr"><italic>22</italic></xref>), the giant short-faced bear (<italic>Arctotherium</italic> sp.) (<xref rid="R23" ref-type="bibr"><italic>23</italic></xref>), and the South American horse (<italic>Hippidion saldiasi</italic>) (<xref rid="R24" ref-type="bibr"><italic>24</italic></xref>, <xref rid="R25" ref-type="bibr"><italic>25</italic></xref>), to compare extinction dates with the arrival of both humans and the genetically distinct modern lineage of <italic>L. guanicoe</italic> (<xref ref-type="fig" rid="F1">Fig. 1</xref>). We used the Phase calibration function with Outlier analysis in OxCal 4.2 to define the midpoint of the start and end (estimated extinction) of the set of ages for each species (<xref rid="R26" ref-type="bibr"><italic>26</italic></xref>), which revealed that the megafaunal extinctions most likely occurred in a narrow time window spanning 12.2 to 12.5 thousand years (table S4). Individual age calibrations of the youngest samples confirm that extinction took place around this time (table S4). Using the C_Combine function in OxCal, we find that the ages for the different species are statistically indistinguishable, implying that extinction across Patagonia was synchronous, with a mean weighted age of 12,280 ± 110 years ago. By doubling the number of high-quality <sup>14</sup>C-dated megafaunal fossils for this region, we do not observe carnivore extinctions preceding that of herbivores as recently suggested (<xref rid="R5" ref-type="bibr"><italic>5</italic></xref>). Humans were clearly present in Patagonia for at least 1000 years before the extinction event (<xref ref-type="fig" rid="F1">Fig. 1</xref> and table S5), and probably more than 2300 years if Monte Verde more accurately provides a minimum estimate of the occupation of the wider Patagonian area (<xref rid="R13" ref-type="bibr"><italic>13</italic></xref>).</p><p>The prolonged temporal overlap between humans and megafauna in Patagonia (from around 14.6 to 13.2 ka through to the extinction events at 12.3 ka) corresponds closely in timing to the pronounced cold conditions of the ACR stadial (<xref ref-type="fig" rid="F1">Fig. 1</xref>). In contrast, the tight cluster of Patagonian megafaunal extinctions occurs shortly after the start of the rapid warming phase that followed the termination of the ACR. Previous studies of southern Patagonian lake sediments have suggested that the post-ACR environment was arid and windy, with variable rainfall and potential summer droughts (<xref rid="R11" ref-type="bibr"><italic>11</italic></xref>). By 12.3 ka, when the extinctions occured, glacial ice was retreating and sufficient moisture was available to support rapid expansion of <italic>Nothofagus</italic> forest, consistent with the warming observed in the WAIS record (<xref rid="R9" ref-type="bibr"><italic>9</italic></xref>).</p></sec></sec><sec sec-type="discussion" disp-level="1"><title>DISCUSSION</title><p>The close association of the Patagonian megafaunal extinctions with the warming phase following the ACR agrees with recent studies suggesting that interstadials were a key driver of Holarctic megafaunal extinctions through the Late Pleistocene (<xref rid="R27" ref-type="bibr"><italic>27</italic></xref>). However, the reversed temperature trends in North and South America during this period led to a marked inversion in the sequence of events and timing (<xref ref-type="fig" rid="F1">Fig. 1</xref>). In North America, multiple megafaunal extinctions are inferred between 14.6 and 12.8 ka during the warm Greenland Interstadial 1, followed by a relative hiatus during the cold Greenland Stadial 1, before the last extinctions after 11.6 ka in the early Holocene (<xref rid="R27" ref-type="bibr"><italic>27</italic></xref>). The pattern in southern Patagonia is temporally exactly inverted but also shows megafaunal extinctions occurred during a warming phase and a hiatus during a stadial (<xref ref-type="fig" rid="F1">Fig. 1</xref>). In addition, the extinction process in North America appears considerably more protracted, at least from our data, potentially as a consequence of the hiatus during Greenland Stadial 1 in the middle of the event.</p><p>The Patagonian camelid data also appear to reflect metapopulation processes similar to those inferred from ancient DNA studies of several Late Pleistocene Northern Hemisphere megafaunal taxa, including cave bear, bison, and mammoth (<xref rid="R27" ref-type="bibr"><italic>27</italic></xref>–<xref rid="R29" ref-type="bibr"><italic>29</italic></xref>). Following the extinction of Patagonian <italic>L. gracilis</italic> and the Late Pleistocene clade, or possibly subspecies, of <italic>L. guanicoe</italic> around 12.3 ka, a genetically distinct northern population of <italic>L. guanicoe</italic> moved into the region. Early Holocene camelid bone deposits from Cerro Casa del Piedra 7 in southern Patagonia (fig. S1) provide a minimum age (10,551 ± 170 years ago) for the appearance of the replacement northern population (see the Supplementary Materials). Since the latter is ancestral to all modern guanaco stocks, this metapopulation process also appears to have been responsible for the species’ survival. The observation of similar rapid continental-scale conspecific replacements in both the Holarctic and Patagonia suggests that such metapopulation structures were common (<xref rid="R28" ref-type="bibr"><italic>28</italic></xref>, <xref rid="R30" ref-type="bibr"><italic>30</italic></xref>–<xref rid="R32" ref-type="bibr"><italic>32</italic></xref>), reinforcing the hypothesis that they may have evolved to provide resilience to the frequent and marked climatic shifts observed throughout the Pleistocene (<xref rid="R27" ref-type="bibr"><italic>27</italic></xref>).</p><p>Although the Patagonian genetic record has a more limited temporal span than the Northern Hemisphere records previously reported (<xref rid="R27" ref-type="bibr"><italic>27</italic></xref>), the higher resolution afforded by our study reveals the interplay between human impacts and climate change. The initial presence of humans in the area during the ACR stadial conditions was apparently insufficient to drive megafaunal extinctions, in direct contrast to the Blitzkrieg model, which suggests that the naïveté of megafauna to human hunting led to rapid extinction (<xref rid="R33" ref-type="bibr"><italic>33</italic></xref>). However, human presence, in combination with the rapid advance of forests and environmental changes associated with the ensuing warming phase, appears to have led to the collapse of the megafaunal ecosystem within a few hundred years. It is unclear whether rapid increases in human population size were associated with the warming phase, although ancient DNA analyses indicate a very rapid demographic growth among the founding American populations (<xref rid="R34" ref-type="bibr"><italic>34</italic></xref>). The new genetic data are consistent with the hypothesis that human disruption of megafaunal metapopulation processes (for example, long distance dispersal and rescue effects), along with increased hunting pressure associated with decreased habitat range, allowed local population extinctions initiated by environmental change to coalesce into a larger ecosystem-wide alteration, potentially with minimal direct signs of human hunting (<xref rid="R27" ref-type="bibr"><italic>27</italic></xref>).</p></sec><sec sec-type="materials|methods" disp-level="1"><title>MATERIALS AND METHODS</title><p>We collected 175 Late Pleistocene and Holocene megafaunal bone and teeth fragments from museum collections in Argentina (La Plata Museum, La Plata Zoo, Instituto de Ciencias Básicas, Universidad Nacional de Cuyo, and Museo de Historia Natural de San Rafael), Chile (Centro de Estudios del Hombre Austral, Instituto de la Patagonia, and Universidad de Magallanes), Perú (Departamento Científico de Arqueología and Facultad de Ciencias Naturales y Museo), Netherlands (Zoological Museum Amsterdam), Sweden (Museum of Natural History, Malmo), and Russia (Moscow State University Zoological Museum) (tables S1 and S2). Most of the specimens were originally collected from several well-known caves in the Última Esperanza region of southern Patagonia, including Cueva del Milodón, Cueva Lago Sofía 4, and Cueva del Medio. Our sample collection also included megafauna subfossil material from caves in the Patagonia regions of Tierra del Fuego at the southernmost tip of Patagonia, the volcanic area of Pali Aike, and central Santa Cruz (fig. S1). We also sampled Holocene camelid material from these sites in Patagonia, as well as several other caves in the region (fig. S1). The Cerro Casa de Piedra site in the Santa Cruz region of Patagonia contains deposits of guanaco material spanning the early Holocene to recent times. Finally, we included several camelid samples collected from Peruvian caves to examine which lineages of camelids were present outside of Patagonia during the Pleistocene and the Holocene.</p><p>We sampled well-preserved megafaunal remains, primarily cortical limb bone and tooth roots, using a Dremel drill and disposable carborundum cutting discs. Samples of approximately 100 mg were removed and transferred to the ancient DNA laboratory.</p><sec disp-level="2"><title>DNA extraction and sequencing of mtDNA</title><p>We primarily carried out ancient DNA laboratory procedures at the Australian Centre for Ancient DNA (ACAD) in Adelaide, Australia, although the felid specimens had previously been examined at the Henry Wellcome Ancient Biomolecules Centre in Oxford, UK. We followed standard ancient DNA protocols for DNA extraction and polymerase chain reaction (PCR) setup in a physically isolated, clean laboratory with positive air pressure, HEPA-filtered air flow and ultraviolet (UV) lights, regular bleaching, and multiple controls for all stages of the procedures (<xref rid="R35" ref-type="bibr"><italic>35</italic></xref>). Before extraction, we attempted to remove potential contaminants by removing the outer layer of each sample using a Dremel drill and disposable carborundum cutting discs and by exposing the sample to UV light. DNA was extracted using either phenol-chloroform (<xref rid="R36" ref-type="bibr"><italic>36</italic></xref>) or silica-based extraction methods (<xref rid="R37" ref-type="bibr"><italic>37</italic></xref>).</p><p>We amplified a number of phylogenetically informative mitochondrial fragments (for example, control region, cytochrome b, ATP8, and/or ND5) for each sample to confirm morphological identification (table S3). Due to the degraded nature of the samples, we amplified multiple, short, overlapping DNA fragments. We detail the PCR conditions for each group of taxa below (camelids, felids, and bear).</p><sec disp-level="3"><title>Camelid samples</title><p>Six control region fragments and one cytochrome b fragment were targeted for PCR using primers listed in table S3. Two sets of multiplex PCRs were performed to amplify all seven fragments (<xref rid="R38" ref-type="bibr"><italic>38</italic></xref>). Multiplex PCRs were done in a final volume of 25 μl using 1 to 2 U of Platinum <italic>Taq</italic> High-Fidelity DNA Polymerase and 1× buffer (Invitrogen), rabbit serum albumin (RSA) (2 mg/ml; Sigma), 2 mM MgSO<sub>4</sub>, 250 μM of each deoxynucleotide triphosphate (dNTP), 1 μM of each primer, and 1 to 4 μl of DNA. PCRs were run at 94°C for 1 min followed by 30 cycles (multiplex) or 50 cycles (singleplex) at 94°C for 15 s, 55°C for 15 s, and 68°C for 30 s, and a final elongation step at 68°C for 10 min. A no-template control and a negative extraction control were included for approximately every four samples. The second round of PCR was performed in singleplex reactions with 0.5 U of HotMaster Taq, 1× buffer (HotMaster), 200 μM of each dNTP, bovine serum albumin (BSA) (1 mg/ml), 1 μM of each primer, and a 100-fold dilution of the first-round PCR product. PCR products were visualized on a 4% tris-borate EDTA agarose gel. In rare cases in which a negative control exhibited a band, the PCR was discarded and not used for sequencing.</p></sec><sec disp-level="3"><title>Felid samples</title><p>The general carnivore primers ATP8_1F/ATP8_3R were initially used to identify the species, followed by more species-specific overlapping primer pairs to amplify regions of the <italic>Smilodon</italic>, puma, and jaguar samples (table S3). PCR amplifications (25 μl of total volume) were done using Platinum <italic>Taq</italic> High-Fidelity DNA Polymerase (1.25 U; Invitrogen), 1× buffer (Invitrogen), BSA (0.2% w/v; Sigma), 2 mM MgSO<sub>4</sub>, 2′-deoxynucleotide 5′-triphosphate mix (all 25 mM), 1 μl of an extract, and 1 μM each of forward and reverse primers. A 2-min activation step at 94°C was followed by 45 cycles at 94°C for 45s, an appropriate annealing temperature for 45 s, and at 68°C for 1 min and 30 s. PCR products were purified using the QIAquick system (Qiagen Ltd.). For <italic>P. concolor</italic>, approximately 650 base pairs (bp) of mtDNA (16S, ND5, and ATP8) were sequenced (table S3).</p></sec><sec disp-level="3"><title>Bear samples</title><p>Ancient DNA extracts were initially tested using carnivore-specific primers designed to amplify a 135-bp fragment of the hypervariable region of the mtDNA control region (<xref rid="R39" ref-type="bibr"><italic>39</italic></xref>). Additionally, for the ancient DNA extracts from which the 135-bp control region fragment was successfully amplified and sequenced, a multiplex PCR protocol (<xref rid="R38" ref-type="bibr"><italic>38</italic></xref>) was applied, yielding a total of 135 to 364 bp of control region sequence and up to 137 bp of protein-coding ATP8 sequence and 192 bp of cytochrome b sequence (table S3). Multiplex reactions were set up in the ancient DNA facility at ACAD. Each multiplex reaction (20 μl) contained the following: 1 μl of DNA extract, 2 U of Platinum <italic>Taq</italic> High-Fidelity DNA Polymerase and 1× buffer (Invitrogen), RSA (1 mg/ml; Sigma), 8 mM MgSO4, 250 μM of each dNTP, and 3 μl of primer mix A or B (each containing the three primer pairs at a concentration of 1 μM). Multiplex PCR thermal cycling reactions were conducted at 94°C for 1 min, followed by 30 cycles of denaturation at 94°C for 15 s, annealing for 20 s at 55°C, and extension at 68°C for 30 s, followed by a final extension at 68°C for 10 min. The PCR master mix for the singleplex reactions contained the following: 5 μl of 1:20 dilution of multiplex PCR product, 0.25 U of Platinum <italic>Taq</italic> High-Fidelity DNA Polymerase and 1× buffer (Invitrogen), RSA (1 mg/ml; Sigma), MgSO<sub>4</sub>, 250 μM of each dNTP, 0.75 μM forward primer, and 0.75 μM reverse primer. Singleplex PCR thermal cycling reactions were conducted at 94°C for 1 min, followed by 30 cycles of denaturation at 94°C denaturation for 15 s, annealing for 20 s at 55°C, and extension at 68°C for 30 s, followed by a final extension at 68°C for 10 min. Amplification products (from normal or singleplex PCRs described above) of the expected size were purified using ExoSAP-IT or Agencourt AMPure PCR purification kit according to the manufacturer’s instructions.</p><p>We used Sanger sequencing methods with BigDye chemistry and an ABI 3130xl Genetic Analyzer or an ABI PRISM capillary DNA 377 and 310 automated sequencers (Applied Biosystems) to sequence amplicons either directly or after molecular cloning. To ensure that our results were robust, a subset was independently replicated at the Centre for GeoGenetics in Copenhagen, Denmark and the Henry Wellcome Ancient Biomolecules Centre in Oxford, UK. Below, we describe independent replication for each taxon.</p></sec><sec disp-level="3"><title>Camelid samples</title><p>Independent replication for successful samples from each major taxon was performed at the Centre for GeoGenetics in Copenhagen, Denmark. Here, the samples were drilled or crushed to obtain ~280 mg (10 to 660 mg) of bone powder extracted in 0.5 M EDTA, 100 μl of proteinase K, and 0.5% SDS or <italic>N</italic>-lauryl-sarcosine at 37°C for 24 to 48 hours until all bone powder was digested. This was followed by centrifugation using a Millipore centrifuge at 3500<italic>g</italic> for 20 to 60 min and then by DNA purification using QIAquick columns and elution to 80 μl. Three samples were extracted in each session with an extraction blank. Two pools of multiplex PCR consisting of eight primers each were done as to ACAD, except 0.25 U of Taq Gold, 1× gold buffer, 4 mM MgCl<sub>2</sub>, and BSA (1 mg/ml). The second round of singleplex PCR was done on a 1:20 dilution of the PCR product from the first round. Extraction blanks, and PCR controls included with every six samples, were all blank. Sanger sequencing was done at the Macrogen facilities (Korea), and sequences were assembled and aligned using Sequencher version 4.8.</p></sec></sec><sec disp-level="2"><title>Phylogenetic analysis</title><p>We estimated the best nucleotide substitution model for each mitochondrial gene for each species by selecting the model with the lowest Akaike’s information criterion score using ModelTest (<xref rid="R40" ref-type="bibr"><italic>40</italic></xref>) or other similar software. We inferred phylogenies using Bayesian methods in BEAST (<xref rid="R41" ref-type="bibr"><italic>41</italic></xref>) and likelihood methods using PhyML (<xref rid="R42" ref-type="bibr"><italic>42</italic></xref>, <xref rid="R43" ref-type="bibr"><italic>43</italic></xref>), and reported Bayesian prior probabilities and maximum likelihood estimates, respectively, of highly supported nodes. For the closely related Puma haplotypes, we constructed a parsimony haplotype network using TCS (<xref rid="R44" ref-type="bibr"><italic>44</italic></xref>). Details on the phylogenetic analysis of each taxon are included below.</p><sec disp-level="3"><title>Camelid samples</title><p>We aligned sequences by eye using Se-Al version 2.0a11 (<ext-link ext-link-type="uri" xlink:href="http://tree.bio.ed.ac.uk/software/seal/">http://tree.bio.ed.ac.uk/software/seal/</ext-link>). We reconstructed the phylogenetic relationship of camelids using Bayesian methods in BEAST (<xref rid="R41" ref-type="bibr"><italic>41</italic></xref>) and likelihood methods using PhyML (<xref rid="R42" ref-type="bibr"><italic>42</italic></xref>, <xref rid="R43" ref-type="bibr"><italic>43</italic></xref>). First, we analyzed a data set that consisted of 541 nucleotides of mitochondrial sequence data (~432 bp of control region plus 107 bp of cytochrome <italic>b</italic>), for a total of 78 taxa, including 30 ancient Pleistocene samples, 13 ancient Holocene samples, and 35 modern camelid haplotypes, which include 5 <italic>Camelus</italic> haplotypes (<xref ref-type="fig" rid="F2">Fig. 2</xref>). Second, we analyzed a larger sample set with 432 bp of mtDNA control region. These data included 88 ancient camelid samples and 77 modern camelid haplotypes (fig. S2). We downloaded sequence data representing modern camelid genetic diversity from GenBank (<xref rid="R45" ref-type="bibr"><italic>45</italic></xref>, <xref rid="R46" ref-type="bibr"><italic>46</italic></xref>).</p></sec><sec disp-level="3"><title>Felid samples</title><p>Sequences were aligned by eye using Se-Al version 2.0a11 (<ext-link ext-link-type="uri" xlink:href="http://tree.bio.ed.ac.uk/software/seal/">http://tree.bio.ed.ac.uk/software/seal/</ext-link>). We analyzed 343 bp of control region and 143 bp of ATP8 mitochondrial sequence data from <italic>P. onca mesembrina</italic>. We generated a phylogeny using a UPGMA tree-building method with an HKY model of sequence evolution and 100 bootstraps (<xref ref-type="fig" rid="F2">Fig. 2</xref>). We analyzed ~650 bp of 16<italic>S</italic>, ND5, and ATP8 of sequence data from <italic>P. concolor</italic> samples, and visualized their close relationship to modern haplotypes with a parsimony haplotype network (<xref ref-type="fig" rid="F2">Fig. 2</xref>) using TCS (<xref rid="R44" ref-type="bibr"><italic>44</italic></xref>).</p></sec><sec disp-level="3"><title>Bear samples</title><p>We carried out phylogenetic reconstructions of Tremarctinae bears using 694 bp of mitochondrial sequence data from the <italic>Arctotherium</italic> sp. sample ACAD3599, along with previously sequenced Tremarctinae bears (<italic>Tremarctos</italic> and <italic>Arctodus</italic>) and previously sequenced members of Ursine bears, the sister group to Tremarctinae (<xref rid="R47" ref-type="bibr"><italic>47</italic></xref>–<xref rid="R49" ref-type="bibr"><italic>49</italic></xref>). We used the HKY + gamma model in BEAST 1.4.8 (<xref rid="R41" ref-type="bibr"><italic>41</italic></xref>) to generate a Bayesian inference phylogeny. Three independent runs of 10 million Markov chain Monte Carlo generations sampled every 1000 steps were done in BEAST 1.4.8 (<xref rid="R41" ref-type="bibr"><italic>41</italic></xref>) using a relaxed molecular clock (uncorrelated lognormal). The results of the three independent runs were combined. Results of the individual and combined runs were visualized using Tracer 1.4 (<ext-link ext-link-type="uri" xlink:href="http://tree.bio.ed.ac.uk/software/tracer">http://tree.bio.ed.ac.uk/software/tracer</ext-link>) to check for convergence and to ensure that all Effective Sample Size scores were >200 (suggesting sufficient sampling and run length). The first 1 million steps (10%) of each run were discarded as burn-in. The trees were annotated and visualized using FigTree 1.1.2 (<ext-link ext-link-type="uri" xlink:href="http://tree.bio.ed.ac.uk/software/figtree">http://tree.bio.ed.ac.uk/software/figtree</ext-link>).</p></sec></sec><sec disp-level="2"><title><sup>14</sup>C dating and calibrations</title><p>We generated 75 new date estimates of megafaunal bone and teeth using AMS <sup>14</sup>C dating, most of which were pretreated using ultrafiltration to purify the gelatin and minimize contamination [following (<xref rid="R50" ref-type="bibr"><italic>50</italic></xref>)] at the Oxford Radiocarbon Accelerator Unit (ORAU) (table S1). The <sup>14</sup>C ages were calibrated against the SHCal13 data set (table S4) (<xref rid="R51" ref-type="bibr"><italic>51</italic></xref>). We also calibrated previously published <sup>14</sup>C data from the large ground sloth (<italic>M. darwinii</italic>) (<xref rid="R14" ref-type="bibr"><italic>14</italic></xref>, <xref rid="R20" ref-type="bibr"><italic>20</italic></xref>, <xref rid="R52" ref-type="bibr"><italic>52</italic></xref>), the saber-toothed cat (<italic>S. populator</italic>) (<xref rid="R22" ref-type="bibr"><italic>22</italic></xref>, <xref rid="R53" ref-type="bibr"><italic>53</italic></xref>), the giant short-faced bear (<italic>Arctotherium</italic> sp.) (<xref rid="R23" ref-type="bibr"><italic>23</italic></xref>), and the South American horse (<italic>H. saldiasi</italic>) (<xref rid="R24" ref-type="bibr"><italic>24</italic></xref>, <xref rid="R25" ref-type="bibr"><italic>25</italic></xref>) [summarized in (<xref rid="R4" ref-type="bibr"><italic>4</italic></xref>) and (<xref rid="R14" ref-type="bibr"><italic>14</italic></xref>)]. For extinct Pleistocene megafauna, the <sup>14</sup>C ages were used to constrain the estimates of extinction ages for megafaunal taxa using the Phase model option in OxCal 4.2 (<xref rid="R26" ref-type="bibr"><italic>26</italic></xref>) with General Outlier analysis detection (probability = 0.05) (<xref rid="R54" ref-type="bibr"><italic>54</italic></xref>). Importantly, this approach assumes a uniform (Poisson) distribution of <sup>14</sup>C ages to estimate the calendar age boundaries (<xref rid="R55" ref-type="bibr"><italic>55</italic></xref>); where there were less than 11 <sup>14</sup>C ages for a group, we did not use the Phase option and instead undertook individual age calibration. Using Bayes’ theorem, the algorithms employed sample possible solutions with a posterior probability that is the product of the prior and likelihood probabilities; the outlier option was used to detect ages that fall outside the calibration model for each group and, if necessary, down-weight their contribution to the final age estimates. Taking into account the deposition model and the actual age measurements, the posterior probability densities quantify the likeliest age distributions. The calibrated ages are reported in table S4. To reassure ourselves that the Phase age modeling results are robust, we undertook individual calibrations of the youngest samples for each Patagonian species with greater than 11 <sup>14</sup>C dates. The ages were calibrated using SHCal13 (<xref rid="R50" ref-type="bibr"><italic>50</italic></xref>) in OxCal 4.2 (<xref rid="R26" ref-type="bibr"><italic>26</italic></xref>) (table S4). All calibrated ages fall within the period of rapid warming that followed the termination of the ACR, supporting the approach taken here.</p><p>We used published data sets (<xref rid="R56" ref-type="bibr"><italic>56</italic></xref>, <xref rid="R57" ref-type="bibr"><italic>57</italic></xref>) to estimate the arrival of humans in Patagonia, and followed their criteria for screening radiocarbon ages. We calibrated <sup>14</sup>C dates using the SHCal13 data set, as described in the previous paragraph (table S5), and estimated human arrival using the Phase model option in OxCal 4.2 (<xref rid="R26" ref-type="bibr"><italic>26</italic></xref>) with General Outlier analysis detection (probability = 0.05) (<xref rid="R54" ref-type="bibr"><italic>54</italic></xref>). A χ<sup>2</sup> test demonstrates that human arrival was statistically different to extinction in Patagonia (df = 1, <italic>T</italic> = 17.270, 5% = 3.8).</p><p>The wide range of geographic sites, depositional situations, closely spaced (and relatively young) <sup>14</sup>C ages from different species, and the statistical overlap of the Phase ages generated using OxCal 4.2 (<xref rid="R26" ref-type="bibr"><italic>26</italic></xref>) makes it highly unlikely that the narrow temporal window of the last observations might be the result of a taphonomic or observational artifact, such as the Signor-Lipps effect (<xref rid="R58" ref-type="bibr"><italic>58</italic></xref>). Furthermore, the density and quality of the AMS <sup>14</sup>C dates (mostly bone or teeth samples pretreated using ultrafiltration at ORAU) suggest that the chronological series are accurate. Importantly, the Signor-Lipps effect would only extend the period of apparent overlap between humans and megafauna and further confirm our observation that the megafaunal, extinctions occurred during the warming phase following the ACR stadial.</p><p>We plotted the summed probabilities of the IntCal13-calibrated (<xref rid="R59" ref-type="bibr"><italic>59</italic></xref>) terminal AMS dates for North American <italic>Equus caballus, Saiga tatarica, Panthera leo spelaea, Mammuthus primigenius,</italic> and <italic>Mammut americanum</italic> from the study of Cooper <italic>et al</italic>. (<xref rid="R27" ref-type="bibr"><italic>27</italic></xref>), and plotted these against time. These were the only latest Pleistocene North American megafaunal extinctions with suitably detailed <sup>14</sup>C data sets available (<xref rid="R27" ref-type="bibr"><italic>27</italic></xref>). Timing of onset and termination of the ACR are as defined by Antarctic ice core isotopic records and change in the interhemispheric radiocarbon gradient (<xref rid="R7" ref-type="bibr"><italic>7</italic></xref>, <xref rid="R9" ref-type="bibr"><italic>9</italic></xref>).</p></sec></sec></body><back><ack><title>Acknowledgments</title><p>We thank the following museums and universities for the samples: La Plata Museum, La Plata Zoo, Universidad Nacional de Cuyo, Museo de Historia Natural de San Rafael, Instituto de la Patagonia, Universidad de Magallanes, Museo de Historia Natural, Universidad Nacional Mayor de San Marcos, Zoological Museum Amsterdam, Malmo Museum of Natural History, and Moscow State University Zoological Museum. We thank S. Silvestri, M. Reguero, E. Tonni, A. Prieto, and J. Weinstock. We also thank the ACAD staff and researchers for their support and assistance. <bold>Funding:</bold> This research was funded by the Australian Research Council (ARC) (DP140104233 and DP0664562) and the UK Natural Environment Research Council (NERC) (grant NER/B/S/2003/00181 to A.C.). J.T.V. was funded by the Danish National Research Foundation (DNRF94), and R.B. was funded by the Biotechnology and Biological Sciences Research Council (02/A1/G/08351) and NERC (NER/B/S/2003/00181). ARC Future, Federation, and Laureate fellowships supported A.C. (FL140100260, FT099233, and FF0457313), C.T. (FL100100195), C.J.A.B. (DP130103842 and FT110100306), and J.J.A. (FT10010010). F.J.P. was funded by CONICET and Agencia Nacional de Promoción Científica y Tecnológica (PICT 2011-309 and PIP 2011-164). <bold>Author contributions:</bold> A.C. conceived the project; A.C., J.L.M., C.T., R.B., S.C.B., and C.J.A.B. performed the research and analysis; and A.C., J.L.M., and C.T. wrote the paper with input from all authors. <bold>Competing interests:</bold> The authors declare that they have no competing interests. <bold>Data and materials availability:</bold> The genetic sequences have been deposited in GenBank (KU753598 to KU753727 and KU884290 to KU884323), and the new and previously published <sup>14</sup>C data are presented in the Supplementary Materials with references. Additional data related to this paper may be requested from the authors.</p></ack><app-group><app><title>SUPPLEMENTARY MATERIALS</title><supplementary-material content-type="local-data"><p>Supplementary material for this article is available at <ext-link ext-link-type="uri" xlink:href="http://advances.sciencemag.org/cgi/content/full/2/6/e1501682/DC1">http://advances.sciencemag.org/cgi/content/full/2/6/e1501682/DC1</ext-link></p><p>Supplementary Methods</p><p>Supplementary Results</p><p>fig. S1. Map of South America showing sites where genetic data were recovered.</p><p>fig. S2. Phylogeny of camelids based on 432 bp of mitochondrial control region data.</p><p>fig. S3. Mitochondrial sequence data for <italic>Arctotherium</italic>.</p><p>table S1. Fossil samples included in this study.</p><p>table S2. Samples for which DNA extraction failed and <sup>14</sup>C failed or was not attempted.</p><p>table S3. Primer sequences used to amplify mitochondrial genes.</p><p>table S4. Megafaunal <sup>14</sup>C ages were calibrated against the SHCal13 data set.</p><p>table S5. Published human <sup>14</sup>C ages were calibrated against the SHCal13 data set.</p><p>table S6. Results of independent replication of ancient DNA sequences.</p><p>References (<xref rid="R61" ref-type="bibr"><italic>61</italic></xref>–<xref rid="R65" ref-type="bibr"><italic>65</italic></xref>)</p></supplementary-material></app></app-group><ref-list><title>REFERENCES AND NOTES</title><ref id="R1"><label>1</label><mixed-citation publication-type="journal"><person-group person-group-type="author"><name name-style="western"><surname>Bird</surname><given-names>J.</given-names></name></person-group>,
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