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      Tropical forests in the deep human past

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          Abstract

          Since Darwin, studies of human evolution have tended to give primacy to open ‘savannah’ environments as the ecological cradle of our lineage, with dense tropical forests cast as hostile, unfavourable frontiers. These perceptions continue to shape both the geographical context of fieldwork as well as dominant narratives concerning hominin evolution. This paradigm persists despite new, ground-breaking research highlighting the role of tropical forests in the human story. For example, novel research in Africa's rainforests has uncovered archaeological sites dating back into the Pleistocene; genetic studies have revealed very deep human roots in Central and West Africa and in the tropics of Asia and the Pacific; an unprecedented number of coexistent hominin species have now been documented, including Homo erectus, the ‘Hobbit’ ( Homo floresiensis), Homo luzonensis, Denisovans, and Homo sapiens. Some of the earliest members of our own species to reach South Asia, Southeast Asia, Oceania and the tropical Americas have shown an unexpected rapidity in their adaptation to even some of the more ‘extreme’ tropical settings. This includes the early human manipulation of species and even habitats. This volume builds on these currently disparate threads and, for the first time, draws together a group of interdisciplinary, agenda-setting papers that firmly places a broader spectrum of tropical environments at the heart of the deep human past.

          This article is part of the theme issue ‘Tropical forests in the deep human past’.

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          Hyperdominance in the Amazonian tree flora.

          The vast extent of the Amazon Basin has historically restricted the study of its tree communities to the local and regional scales. Here, we provide empirical data on the commonness, rarity, and richness of lowland tree species across the entire Amazon Basin and Guiana Shield (Amazonia), collected in 1170 tree plots in all major forest types. Extrapolations suggest that Amazonia harbors roughly 16,000 tree species, of which just 227 (1.4%) account for half of all trees. Most of these are habitat specialists and only dominant in one or two regions of the basin. We discuss some implications of the finding that a small group of species--less diverse than the North American tree flora--accounts for half of the world's most diverse tree community.
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            New fossils from Jebel Irhoud, Morocco and the pan-African origin of Homo sapiens

            Fossil evidence points to an African origin of Homo sapiens from a group called either H. heidelbergensis or H. rhodesiensis. However, the exact place and time of emergence of H. sapiens remain obscure because the fossil record is scarce and the chronological age of many key specimens remains uncertain. In particular, it is unclear whether the present day ‘modern’ morphology rapidly emerged approximately 200 thousand years ago (ka) among earlier representatives of H. sapiens or evolved gradually over the last 400 thousand years. Here we report newly discovered human fossils from Jebel Irhoud, Morocco, and interpret the affinities of the hominins from this site with other archaic and recent human groups. We identified a mosaic of features including facial, mandibular and dental morphology that aligns the Jebel Irhoud material with early or recent anatomically modern humans and more primitive neurocranial and endocranial morphology. In combination with an age of 315 ± 34 thousand years (as determined by thermoluminescence dating), this evidence makes Jebel Irhoud the oldest and richest African Middle Stone Age hominin site that documents early stages of the H. sapiens clade in which key features of modern morphology were established. Furthermore, it shows that the evolutionary processes behind the emergence of H. sapiens involved the whole African continent.
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              Megafauna and ecosystem function from the Pleistocene to the Anthropocene

              Large herbivores and carnivores (the megafauna) have been in a state of decline and extinction since the Late Pleistocene, both on land and more recently in the oceans. Much has been written on the timing and causes of these declines, but only recently has scientific attention focused on the consequences of these declines for ecosystem function. Here, we review progress in our understanding of how megafauna affect ecosystem physical and trophic structure, species composition, biogeochemistry, and climate, drawing on special features of PNAS and Ecography that have been published as a result of an international workshop on this topic held in Oxford in 2014. Insights emerging from this work have consequences for our understanding of changes in biosphere function since the Late Pleistocene and of the functioning of contemporary ecosystems, as well as offering a rationale and framework for scientifically informed restoration of megafaunal function where possible and appropriate.
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                Author and article information

                Contributors
                Role: ConceptualizationRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Writing – original draftRole: Writing – review & editing
                Journal
                Philos Trans R Soc Lond B Biol Sci
                Philos Trans R Soc Lond B Biol Sci
                RSTB
                royptb
                Philosophical Transactions of the Royal Society B: Biological Sciences
                The Royal Society
                0962-8436
                1471-2970
                April 25, 2022
                March 7, 2022
                March 7, 2022
                : 377
                : 1849 , Theme issue ‘Tropical forests in the deep human past’ compiled and edited by Eleanor M.L. Scerri, Patrick Roberts, S. Yoshi Maezumi and Yadvinder Malhi
                : 20200500
                Affiliations
                [ 1 ] Pan-African Evolution Research Group, Max Planck Institute for the Science of Human History, , Kahlaische Strasse 10, 07745, Jena, Germany
                [ 2 ] Department of Archaeology, Max Planck Institute for the Science of Human History, , Kahlaische Strasse 10, 07745, Jena, Germany
                [ 3 ] Department of Classics and Archaeology, University of Malta, , Msida, Malta
                [ 4 ] Department of Prehistoric Archaeology, University of Cologne, , 50931 Cologne, Germany
                [ 5 ] School of Social Sciences, University of Queensland, , Brisbane, Australia
                [ 6 ] Department of Ecosystem and Landscape Dynamics, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, , 1098 XH Amsterdam, The Netherlands
                [ 7 ] Environmental Change Institute, School of Geography and the Environment, University of Oxford, , South Parks Road, Oxford OX1 3QY, UK
                Author notes

                One contribution of 15 to a theme issue ‘ Tropical forests in the deep human past’.

                Author information
                http://orcid.org/0000-0002-7468-9977
                http://orcid.org/0000-0002-4403-7548
                http://orcid.org/0000-0002-4333-1972
                http://orcid.org/0000-0002-3503-4783
                Article
                rstb20200500
                10.1098/rstb.2020.0500
                8899628
                35249383
                c118180d-430b-40b3-bbe2-d4fd4eb06833
                © 2022 The Authors.

                Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

                History
                : January 14, 2022
                : January 17, 2022
                Funding
                Funded by: European Commission, http://dx.doi.org/10.13039/501100000780;
                Award ID: 792197
                Funded by: Jackson Foundation, http://dx.doi.org/10.13039/100002158;
                Funded by: H2020 European Research Council, http://dx.doi.org/10.13039/100010663;
                Award ID: 850709
                Funded by: Max-Planck-Gesellschaft, http://dx.doi.org/10.13039/501100004189;
                Categories
                1001
                60
                70
                Introduction
                Introduction
                Custom metadata
                April 25, 2022

                Philosophy of science
                tropics,human evolution,tropical forests,rainforest
                Philosophy of science
                tropics, human evolution, tropical forests, rainforest

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