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Malukiewicz J, Warren K, Boere V, Bandeira ILC, Curi NHA, das Dores FT, Fitorra LS, Furuya HR, Igayara CS, Milanelo L, Moreira SB, Molina CV, Nardi MS, Nicola PA, Passamani M, Pedro VS, Pereira LCM, Petri B, Pissinatti A, Quirino AA, Rogers J, Ruiz-Miranda CR, Silva DL, Silva IO, Silva MOM, Summa JL, Zwarg T, Ackermann RR. Pelage variation and morphometrics of closely related Callithrix marmoset species and their hybrids. BMC Ecol Evol 2024; 24:122. [PMID: 39304843 DOI: 10.1186/s12862-024-02305-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2024] [Accepted: 08/29/2024] [Indexed: 09/22/2024] Open
Abstract
BACKGROUND Hybrids are expected to show greater phenotypic variation than their parental species, yet how hybrid phenotype expression varies with genetic distances in closely-related parental species remains surprisingly understudied. Here, we investigate pelage and morphometric trait variation in anthropogenic hybrids between four species of Brazilian Callithrix marmosets, a relatively recent primate radiation. Marmoset species are distinguishable by pelage phenotype and morphological specializations for eating tree exudates. In this work, we (1) describe qualitative phenotypic pelage differences between parental species and hybrids; (2) test whether significant quantitative differences exist between parental and hybrid morphometric phenotypes; and (3) determine which hybrid morphometic traits show heterosis, dysgenesis, trangression, or intermediacy relative to the parental trait. We investigated cranial and post-cranial morphometric traits, as most hybrid morphological studies focus on the former instead of the latter. Finally, we estimate mitogenomic distances between marmoset species from previously published data. RESULTS Marmoset hybrid facial and overall body pelage variation reflected novel combinations of coloration and patterns present in parental species. In morphometric traits, C. jacchus and C. penicillata were the most similar, while C. aurita was the most distinct, and C. geoffroyi trait measures fell between these species. Only three traits in C. jacchus x C. penicillata hybrids showed heterosis. We observed heterosis and dysgenesis in several traits of C. penicillata x C. geoffroyi hybrids. Transgressive segregation was observed in hybrids of C. aurita and the other species. These hybrids were also C. aurita-like for a number of traits, including body length. Genetic distance was closest between C. jacchus and C. penicillata and farthest between C. aurita and the other species. CONCLUSION We attributed significant morphometric differences between marmoset species to variable levels of morphological specialization for exudivory in these species. Our results suggest that intermediate or parental species-like hybrid traits relative to the parental trait values are more likely in crosses between species with relatively lesser genetic distance. More extreme phenotypic variation is more likely in parental species with greater genetic distance, with transgressive traits appearing in hybrids of the most genetically distant parental species. We further suggest that fewer developmental disturbances can be expected in hybrids of more recently diverged parental species, and that future studies of hybrid phenotypic variation should investigate selective pressures on Callithrix cranial and post-cranial morphological traits.
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Affiliation(s)
- Joanna Malukiewicz
- Research Unit for Evolutionary Immunogenomics, Department of Biology, University of Hamburg, Martin-Luther-King-Platz 3, Hamburg, Germany.
- Faculty of Medicine, University of São Paulo, Av. Dr. Arnaldo, 455 - Cerqueira César, Pacaembu, 01246-903, São Paulo, Brazil.
| | - Kerryn Warren
- Department of Archaeology, University of Cape Town, Rondebosch, 7701, Cape Town, South Africa
- Human Evolution Research Institute, University of Cape Town, Rondebosch, 7701, Cape Town, South Africa
| | - Vanner Boere
- Institute of Humanities, Arts, and Sciences at the Federal University of Southern Bahia, Rodovia de Acesso para Itabuna, km 39 - Ferradas, 45613-204, Itabuna, Brazil
| | - Illaira L C Bandeira
- Centro de Conservação e Manejo de Fauna da Caatinga, Universidade Federal do Vale do São Francisco, Campus Ciências Agrárias, BR 407, Km 12, lote 543, Projeto de Irrigação Nilo Coelho - S/N C1, 56300-000, Petrolina, Brazil
| | - Nelson H A Curi
- Curso de Medicina Veterinária, Centro Universitário de Lavras, Rua Padre José Poggel, 506 - Padre Dehon, 37203-593, Lavras, Brazil
| | - Fabio T das Dores
- Centro de Triagem e Recuperação de Animais Silvestres, Rodovia Parque, 8055 - Vila Santo Henrique, 03719-000, São Paulo, Brazil
| | - Lilian S Fitorra
- Centro de Triagem e Recuperação de Animais Silvestres, Rodovia Parque, 8055 - Vila Santo Henrique, 03719-000, São Paulo, Brazil
| | - Haroldo R Furuya
- Centro de Triagem e Recuperação de Animais Silvestres, Rodovia Parque, 8055 - Vila Santo Henrique, 03719-000, São Paulo, Brazil
| | - Claudia S Igayara
- Zoológico Municipal de Guarulhos, Av. Doná Glória Pagnonceli, 344 - Jardim Rosa de Franca, Guarulhos, 07081-120, Guarulhos, Brazil
| | - Liliane Milanelo
- Centro de Triagem e Recuperação de Animais Silvestres, Rodovia Parque, 8055 - Vila Santo Henrique, 03719-000, São Paulo, Brazil
| | - Silvia B Moreira
- Centro de Primatologia do Rio de Janeiro, Estr. do Paraíso, s/n - Paraíso, 25940-000, Guapimirim, Brazil
| | - Camila V Molina
- Programa de Interunidades em Biotecnologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, Av. Prof. Lineu Prestes , n° 1524 - Butantã, 05508-000, São Paulo, Brazil
| | - Marcello S Nardi
- Prefeitura Municipal de São Paulo, Secretaria Municipal do Verde e Meio Ambiente - DEPAVE, Avenida IV Centenario, portão 7A - Pq. Ibirapuera Jd. Luzitânia, 00000-000, São Paulo, Brazil
| | - Patricia A Nicola
- Programa de Pós-Graduação, Ciências da Saúde e Biológicas, Universidade Federal do Vale do São Francisco, Av. José de Sá Maniçoba, S/N - Centro, 56304-917 -, Petrolina, Brazil
| | - Marcelo Passamani
- Laboratório de Ecologia e Conservação de Mamíferos, Departamento de Ecologia e Conservação, Universidade Federal de Lavras, Av. Central s/n Campus Universitário, 37200-000, Lavras, Brazil
| | - Valeria S Pedro
- Centro de Triagem e Recuperação de Animais Silvestres, Rodovia Parque, 8055 - Vila Santo Henrique, 03719-000, São Paulo, Brazil
| | - Luiz C M Pereira
- Centro de Conservação e Manejo de Fauna da Caatinga, Universidade Federal do Vale do São Francisco, Campus Ciências Agrárias, BR 407, Km 12, lote 543, Projeto de Irrigação Nilo Coelho - S/N C1, 56300-000, Petrolina, Brazil
| | - Bruno Petri
- Centro de Triagem e Recuperação de Animais Silvestres, Rodovia Parque, 8055 - Vila Santo Henrique, 03719-000, São Paulo, Brazil
| | - Alcides Pissinatti
- Centro de Primatologia do Rio de Janeiro, Estr. do Paraíso, s/n - Paraíso, 25940-000, Guapimirim, Brazil
| | - Adriana Alves Quirino
- Centro de Conservação e Manejo de Fauna da Caatinga, Universidade Federal do Vale do São Francisco, Campus Ciências Agrárias, BR 407, Km 12, lote 543, Projeto de Irrigação Nilo Coelho - S/N C1, 56300-000, Petrolina, Brazil
| | - Jeffrey Rogers
- Human Genome Sequencing Center and Dept. of Molecular and Human Genetics, Baylor College of Medicine, 1 Baylor Plaza, Houston, 77030, Houston, USA
| | - Carlos R Ruiz-Miranda
- Laboratory of Environmental Sciences, Center for Biosciences and Biotechnology at Universidade Estadual do Norte Fluminense Darcy Ribeiro, Av. Alberto Lamego, 2000 - Parque Califórnia, 28013-602 , Campos dos Goytacazes, Brazil
| | - Daniel L Silva
- Núcleo de Pesquisas em Ciências Biológicas - NUPEB, Federal University of Ouro Preto, R. Três, 408-462, 35400-000, Ouro Preto, Brazil
| | - Ita O Silva
- Institute of Humanities, Arts, and Sciences at the Federal University of Southern Bahia, Rodovia de Acesso para Itabuna, km 39 - Ferradas, 45613-204, Itabuna, Brazil
| | - Monique O M Silva
- Instituto de Ciências Biológicas e da Saúde, Universidade Federal Rural do Rio de Janeiro, Rodovia BR 465, Km 07 - Zona Rural, 23890-000, Seropédica, Brazil
| | - Juliana L Summa
- Prefeitura Municipal de São Paulo, Secretaria Municipal do Verde e Meio Ambiente - DEPAVE, Avenida IV Centenario, portão 7A - Pq. Ibirapuera Jd. Luzitânia, 00000-000, São Paulo, Brazil
| | - Ticiana Zwarg
- Prefeitura Municipal de São Paulo, Secretaria Municipal do Verde e Meio Ambiente - DEPAVE, Avenida IV Centenario, portão 7A - Pq. Ibirapuera Jd. Luzitânia, 00000-000, São Paulo, Brazil
| | - Rebecca R Ackermann
- Department of Archaeology, University of Cape Town, Rondebosch, 7701, Cape Town, South Africa
- Human Evolution Research Institute, University of Cape Town, Rondebosch, 7701, Cape Town, South Africa
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2
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Schroeder L, Ackermann RR. Moving beyond the adaptationist paradigm for human evolution, and why it matters. J Hum Evol 2023; 174:103296. [PMID: 36527977 DOI: 10.1016/j.jhevol.2022.103296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 11/12/2022] [Accepted: 11/12/2022] [Indexed: 12/23/2022]
Abstract
The Journal of Human Evolution (JHE) was founded 50 years ago when much of the foundation for how we think about human evolution was in place or being put in place, providing the main framework for how we consider our origins today. Here, we will explore historical developments, including early JHE outputs, as they relate to our understanding of the relationship between phenotypic variation and evolutionary process, and use that as a springboard for considering our current understanding of these links as applied to human evolution. We will focus specifically on how the study of variation itself has shifted us away from taxonomic and adaptationist perspectives toward a richer understanding of the processes shaping human evolutionary history, using literature searches and specific test cases to highlight this. We argue that natural selection, gene exchange, genetic drift, and mutation should not be considered individually when considering the production of hominin diversity. In this context, we offer suggestions for future research directions and reflect on this more complex understanding of human evolution and its broader relevance to society. Finally, we end by considering authorship demographics and practices in the last 50 years within JHE and how a shift in these demographics has the potential to reshape the science of human evolution going forward.
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Affiliation(s)
- Lauren Schroeder
- Department of Anthropology, University of Toronto Mississauga, Mississauga, ON, L5L 1C6, Canada; Human Evolution Research Institute, University of Cape Town, Rondebosch, 7701, South Africa.
| | - Rebecca Rogers Ackermann
- Human Evolution Research Institute, University of Cape Town, Rondebosch, 7701, South Africa; Department of Archaeology, University of Cape Town, Rondebosch, 7701, South Africa.
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Harvati K, Ackermann RR. Merging morphological and genetic evidence to assess hybridization in Western Eurasian late Pleistocene hominins. Nat Ecol Evol 2022; 6:1573-1585. [PMID: 36064759 DOI: 10.1038/s41559-022-01875-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 08/08/2022] [Indexed: 11/09/2022]
Abstract
Previous scientific consensus saw human evolution as defined by adaptive differences (behavioural and/or biological) and the emergence of Homo sapiens as the ultimate replacement of non-modern groups by a modern, adaptively more competitive group. However, recent research has shown that the process underlying our origins was considerably more complex. While archaeological and fossil evidence suggests that behavioural complexity may not be confined to the modern human lineage, recent palaeogenomic work shows that gene flow between distinct lineages (for example, Neanderthals, Denisovans, early H. sapiens) occurred repeatedly in the late Pleistocene, probably contributing elements to our genetic make-up that might have been crucial to our success as a diverse, adaptable species. Following these advances, the prevailing human origins model has shifted from one of near-complete replacement to a more nuanced view of partial replacement with considerable reticulation. Here we provide a brief introduction to the current genetic evidence for hybridization among hominins, its prevalence in, and effects on, comparative mammal groups, and especially how it manifests in the skull. We then explore the degree to which cranial variation seen in the fossil record of late Pleistocene hominins from Western Eurasia corresponds with our current genetic and comparative data. We are especially interested in understanding the degree to which skeletal data can reflect admixture. Our findings indicate some correspondence between these different lines of evidence, flag individual fossils as possibly admixed, and suggest that different cranial regions may preserve hybridization signals differentially. We urge further studies of the phenotype to expand our ability to detect the ways in which migration, interaction and genetic exchange have shaped the human past, beyond what is currently visible with the lens of ancient DNA.
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Affiliation(s)
- K Harvati
- Paleoanthropology section, Senckenberg Centre for Human Evolution and Palaeoenvironment, Institute for Archaeological Sciences, Eberhard Karls Universität Tübingen, Tübingen, Germany.
- DFG Centre for Advanced Studies 'Words, Bones, Genes, Tools', Eberhard Karls Universität Tübingen, Tübingen, Germany.
| | - R R Ackermann
- Human Evolution Research Institute, University of Cape Town, Cape Town, South Africa.
- Department of Archaeology, University of Cape Town, Cape Town, South Africa.
- DFG Centre for Advanced Studies 'Words, Bones, Genes, Tools', Eberhard Karls Universität Tübingen, Tübingen, Germany.
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Zdjelar N, Nagendran L, Kendall C, Ackermann RR, Schroeder L. The hybrid skull of the eastern coyote (Canis latrans var.): Nonmetric traits and craniomandibular shape. J Morphol 2021; 282:1745-1764. [PMID: 34609013 DOI: 10.1002/jmor.21417] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 09/14/2021] [Accepted: 10/05/2021] [Indexed: 12/24/2022]
Abstract
The increasing awareness that hybridization, and resultant gene flow, plays a major role in animal diversification has led to a growing number of studies that have focused on assessing the morphological consequences of this process. Analyses of mammalian hybrids have identified skeletal effects of hybridization, including a suite of anomalous dental and sutural traits on the skull that are present at high frequencies in hybrid populations. These studies have also detected consistent patterns of morphological shape and size differences between hybrids and parental taxa across a wide variety of organisms. However, more research is required to understand the universality of these traits and shape/size differences. Building on these previous studies, a sample of genetically determined canid hybrids was examined, specifically the eastern coyote (Canis latrans var.), a hybrid between coyotes, wolves, and dogs, to test whether this group exhibits a comparable pattern of anomalous nonmetric characters, and to assess differences in craniomandibular shape and size. First, specimens of C. latrans var., C. latrans, and C. lupus were scored for anomalous traits, including supernumerary and rotated teeth, dental crowding, and sutural anomalies. Geometric morphometric analyses were then conducted on a subset of these individuals to explore craniomandibular size and shape variation, as well as allometry. The results are largely consistent with other studies, indicating that the incidence of dental anomalies, dental crowding, and sutural anomalies is significantly higher in hybrids. However, differences are not significant for supernumerary teeth. The exploration of morphometric variation identifies intermediate morphology in the hybrids, and some indication of greater morphological variability in the mandible. When these results are combined with previous studies, they suggest that skeletal signatures of hybridization are common to different mammalian taxa across multiple generations; however, some traits such as supernumerary teeth may be lost after a few generations.
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Affiliation(s)
- Natasa Zdjelar
- Department of Anthropology, University of Toronto, Toronto, Ontario, Canada
| | - Lavania Nagendran
- Department of Anthropology, University of Toronto, Toronto, Ontario, Canada
| | | | - Rebecca Rogers Ackermann
- Human Evolution Research Institute, University of Cape Town, Rondebosch, South Africa.,Department of Archaeology, University of Cape Town, Rondebosch, South Africa
| | - Lauren Schroeder
- Human Evolution Research Institute, University of Cape Town, Rondebosch, South Africa.,Department of Anthropology, University of Toronto Mississauga, Mississauga, Ontario, Canada.,Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada
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5
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Thompson KA, Urquhart-Cronish M, Whitney KD, Rieseberg LH, Schluter D. Patterns, Predictors, and Consequences of Dominance in Hybrids. Am Nat 2021; 197:E72-E88. [PMID: 33625966 DOI: 10.1086/712603] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AbstractCompared to those of their parents, are the traits of first-generation (F1) hybrids typically intermediate, biased toward one parent, or mismatched for alternative parental phenotypes? To address this empirical gap, we compiled data from 233 crosses in which traits were measured in a common environment for two parent taxa and their F1 hybrids. We find that individual traits in F1s are halfway between the parental midpoint and one parental value. Considering pairs of traits together, a hybrid's bivariate phenotype tends to resemble one parent (parent bias) about 50% more than the other, while also exhibiting a similar magnitude of mismatch due to different traits having dominance in conflicting directions. Using data from an experimental field planting of recombinant hybrid sunflowers, we illustrate that parent bias improves fitness, whereas mismatch reduces fitness. Our study has three major conclusions. First, hybrids are not phenotypically intermediate but rather exhibit substantial mismatch. Second, dominance is likely determined by the idiosyncratic evolutionary trajectories of individual traits and populations. Finally, selection against hybrids likely results from selection against both intermediate and mismatched phenotypes.
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Ackermann RR, Arnold ML, Baiz MD, Cahill JA, Cortés-Ortiz L, Evans BJ, Grant BR, Grant PR, Hallgrimsson B, Humphreys RA, Jolly CJ, Malukiewicz J, Percival CJ, Ritzman TB, Roos C, Roseman CC, Schroeder L, Smith FH, Warren KA, Wayne RK, Zinner D. Hybridization in human evolution: Insights from other organisms. Evol Anthropol 2019; 28:189-209. [PMID: 31222847 PMCID: PMC6980311 DOI: 10.1002/evan.21787] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 01/30/2019] [Accepted: 04/30/2019] [Indexed: 12/14/2022]
Abstract
During the late Pleistocene, isolated lineages of hominins exchanged genes thus influencing genomic variation in humans in both the past and present. However, the dynamics of this genetic exchange and associated phenotypic consequences through time remain poorly understood. Gene exchange across divergent lineages can result in myriad outcomes arising from these dynamics and the environmental conditions under which it occurs. Here we draw from our collective research across various organisms, illustrating some of the ways in which gene exchange can structure genomic/phenotypic diversity within/among species. We present a range of examples relevant to questions about the evolution of hominins. These examples are not meant to be exhaustive, but rather illustrative of the diverse evolutionary causes/consequences of hybridization, highlighting potential drivers of human evolution in the context of hybridization including: influences on adaptive evolution, climate change, developmental systems, sex-differences in behavior, Haldane's rule and the large X-effect, and transgressive phenotypic variation.
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Affiliation(s)
- Rebecca R. Ackermann
- Department of Archaeology, University of Cape Town, Rondebosch, South Africa
- Human Evolution Research Institute, University of Cape Town, Rondebosch, South Africa
| | | | - Marcella D. Baiz
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan
| | - James A. Cahill
- Department of Ecology and Evolutionary Biology, University of California Santa Cruz, Santa Cruz, California
| | - Liliana Cortés-Ortiz
- Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan
| | - Ben J. Evans
- Biology Department, Life Sciences Building, McMaster University, Hamilton, Canada
| | - B. Rosemary Grant
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey
| | - Peter R. Grant
- Department of Ecology and Evolutionary Biology, Princeton University, Princeton, New Jersey
| | - Benedikt Hallgrimsson
- Department of Cell Biology and Anatomy and the Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Canada
| | - Robyn A. Humphreys
- Department of Archaeology, University of Cape Town, Rondebosch, South Africa
- Human Evolution Research Institute, University of Cape Town, Rondebosch, South Africa
| | - Clifford J. Jolly
- Center for the Study of Human Origins, Department of Anthropology, New York University, and NYCEP, New York, New York
| | - Joanna Malukiewicz
- Biodesign Institute, Arizona State University, Tempe, Arizona
- Federal University of Vicosa, Department of Animal Biology, Brazil
| | - Christopher J. Percival
- Department of Cell Biology and Anatomy and the Alberta Children’s Hospital Research Institute, University of Calgary, Calgary, Canada
- Department of Anthropology, Stony Brook University, New York
| | - Terrence B. Ritzman
- Department of Archaeology, University of Cape Town, Rondebosch, South Africa
- Human Evolution Research Institute, University of Cape Town, Rondebosch, South Africa
- Department of Neuroscience, Washington University School of Medicine, St. Louis, Missouri
- Department of Anthropology, Washington University, St. Louis, Missouri
| | - Christian Roos
- Primate Genetics Laboratory, German Primate Center (DPZ), Leibniz Institute for Primate Research, Göttingen, Germany
| | - Charles C. Roseman
- Department of Animal Biology, School of Integrative Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Lauren Schroeder
- Human Evolution Research Institute, University of Cape Town, Rondebosch, South Africa
- Department of Anthropology, University of Toronto Mississauga, Mississauga, Canada
| | - Fred H. Smith
- Department of Sociology and Anthropology, Illinois State University, Normal, Illinois
| | - Kerryn A. Warren
- Department of Archaeology, University of Cape Town, Rondebosch, South Africa
- Human Evolution Research Institute, University of Cape Town, Rondebosch, South Africa
| | | | - Dietmar Zinner
- Cognitive Ethology Laboratory, German Primate Center (DPZ), Leibniz Institute for Primate Research, Göttingen, Germany
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Kohn LAP, Lubach GR. Postcranial Skeletal Differences in Free-Range and Captive-Born Primates. Anat Rec (Hoboken) 2019; 302:761-774. [PMID: 30312525 PMCID: PMC6461526 DOI: 10.1002/ar.23970] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Revised: 05/15/2018] [Accepted: 06/02/2018] [Indexed: 11/07/2022]
Abstract
Skeletal morphology is important in evolutionary, genetic, developmental, physiological, and functional studies. Although samples from free-ranging individuals may be preferable, constraints of sample size, demography, or conservation status may necessitate the inclusion of captive-born individuals. Captivity may be associated with physical, physiological, or behavioral differences that may affect skeletal form. This study assesses differences in postcranial skeletal form between free-range and captive-born Macaca mulatta and Saguinus oedipus. Samples included free-range M. mulatta from Cayo Santiago (Caribbean Primate Research Center) and captive-born macaques from the Wisconsin National Primate Research Center. S. oedipus samples included free-range born and captive-born individuals from the Oak Ridge Associated Universities Marmoset Research Center. Twenty-four dimensions of various bones, including the scapula, upper limb, innominate and lower limb, were recorded for adults. Age of epiphyseal closure was recorded for immature captive-born M. mulatta. Analysis of variance and principal component analyses tested significant differences between free-range born and captive-born individuals in each species. Significant differences were present in size and shape of postcrania between free-range and captive-born within taxa. Free-range macaques were larger than captive-born macaques, but this pattern did not consistently carry over to the Saguinus samples. Shape differences, while present throughout the skeleton, were especially prominent in the scapula. Differences in developmental timing, nutrition, and physical activity can be expected to contribute to the observed differences in postcranial skeletal form. These differences should be considered when captive-born primates are included in morphological or evolutionary studies. Anat Rec, 2018. © 2018 Wiley Periodicals, Inc. Anat Rec, 302:761-774, 2019. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Luci Ann P. Kohn
- Department of Biological Sciences, Campus Box 1651, Southern Illinois University Edwardsville, Edwardsville, IL 62026
| | - Gabriele R. Lubach
- Harlow Center for Biological Psychology, University of Wisconsin, 22 North Charter Street, Madison, WI 53715
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Warren KA, Ritzman TB, Humphreys RA, Percival CJ, Hallgrímsson B, Ackermann RR. Craniomandibular form and body size variation of first generation mouse hybrids: A model for hominin hybridization. J Hum Evol 2018; 116:57-74. [PMID: 29477182 PMCID: PMC6699179 DOI: 10.1016/j.jhevol.2017.12.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 12/04/2017] [Accepted: 12/12/2017] [Indexed: 12/27/2022]
Abstract
Hybridization occurs in a number of mammalian lineages, including among primate taxa. Analyses of ancient genomes have shown that hybridization between our lineage and other archaic hominins in Eurasia occurred numerous times in the past. However, we still have limited empirical data on what a hybrid skeleton looks like, or how to spot patterns of hybridization among fossils for which there are no genetic data. Here we use experimental mouse models to supplement previous studies of primates. We characterize size and shape variation in the cranium and mandible of three wild-derived inbred mouse strains and their first generation (F1) hybrids. The three parent taxa in our analysis represent lineages that diverged over approximately the same period as the human/Neanderthal/Denisovan lineages and their hybrids are variably successful in the wild. Comparisons of body size, as quantified by long bone measurements, are also presented to determine whether the identified phenotypic effects of hybridization are localized to the cranium or represent overall body size changes. The results indicate that hybrid cranial and mandibular sizes, as well as limb length, exceed that of the parent taxa in all cases. All three F1 hybrid crosses display similar patterns of size and form variation. These results are generally consistent with earlier studies on primates and other mammals, suggesting that the effects of hybridization may be similar across very different scenarios of hybridization, including different levels of hybrid fitness. This paper serves to supplement previous studies aimed at identifying F1 hybrids in the fossil record and to introduce further research that will explore hybrid morphologies using mice as a proxy for better understanding hybridization in the hominin fossil record.
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Affiliation(s)
- Kerryn A Warren
- Department of Archaeology, University of Cape Town, South Africa; Human Evolution Research Institute, University of Cape Town, South Africa
| | - Terrence B Ritzman
- Department of Archaeology, University of Cape Town, South Africa; Human Evolution Research Institute, University of Cape Town, South Africa; Department of Neuroscience, Washington University School of Medicine, USA; School of Human Evolution and Social Change, Arizona State University, USA
| | - Robyn A Humphreys
- Department of Archaeology, University of Cape Town, South Africa; Human Evolution Research Institute, University of Cape Town, South Africa
| | - Christopher J Percival
- Department of Cell Biology and Anatomy, McCaig Institute for Bone and Joint Health, Alberta Children's Hospital Research Institute, University of Calgary, Canada; The Alberta Children's Hospital Research Institute, University of Calgary, Canada; The McCaig Institute for Bone and Joint Health, University of Calgary, Canada; Department of Anthropology, Stony Brook, USA
| | - Benedikt Hallgrímsson
- Department of Cell Biology and Anatomy, McCaig Institute for Bone and Joint Health, Alberta Children's Hospital Research Institute, University of Calgary, Canada; The Alberta Children's Hospital Research Institute, University of Calgary, Canada; The McCaig Institute for Bone and Joint Health, University of Calgary, Canada
| | - Rebecca Rogers Ackermann
- Department of Archaeology, University of Cape Town, South Africa; Human Evolution Research Institute, University of Cape Town, South Africa.
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Variation in the nasal cavity of baboon hybrids with implications for late Pleistocene hominins. J Hum Evol 2016; 94:134-45. [PMID: 27178465 DOI: 10.1016/j.jhevol.2016.02.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Revised: 08/03/2015] [Accepted: 02/22/2016] [Indexed: 01/10/2023]
Abstract
Hybridization is increasingly proving to be an important force shaping human evolution. Comparisons of both ancient and modern genomes have provided support for a complex evolutionary scenario over the past million years, with evidence for multiple incidents of gene exchange. However, to date, genetic evidence is still limited in its ability to pinpoint the precise time and place of ancient admixture. For that we must rely on evidence of admixture from the skeleton. The research presented here builds on previous work on the crania of baboon hybrids, focusing on the nasal cavity of olive baboons, yellow baboons, and first generation (F1) hybrids. The nasal cavity is a particularly important anatomical region for study, given the clear differentiation of this feature in Neanderthals relative to their contemporaries, and therefore it is a feature that will likely differ in a distinctive manner in hybrids of these taxa. Metric data consist of 45 linear, area, and volume measurements taken from CT scans of known-pedigree baboon crania. Results indicate that there is clear evidence for differences among the nasal cavities of the parental taxa and their F1 hybrids, including a greater degree of sexual dimorphism in the hybrids. There is also some evidence for transgressive phenotypes in individual F1 animals. The greatest amount of shape variation occurs in the anterior bony cavity, the choana, and the mid-nasopharynx. Extrapolating our results to the fossil record, we would expect F1 hybrid fossils to have larger nasal cavities, on average, than either parental taxon, with overall nasal cavity shape showing the most profound changes in regions that are distinct between the parental taxa (e.g., anterior nasal cavity). We also expect size and shape differences to be more pronounced in male F1 hybrids than in females. Because of pronounced anterior nasal cavity differences between Neanderthals and their contemporaries, we suggest that this model might be effective for examining the fossil record of late Pleistocene contact.
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Morphological Variation in Wild Marmosets (Callithrix penicillata and C. geoffroyi) and Their Hybrids. Evol Biol 2014. [DOI: 10.1007/s11692-014-9284-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Duren DL, Seselj M, Froehle AW, Nahhas RW, Sherwood RJ. Skeletal growth and the changing genetic landscape during childhood and adulthood. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2013; 150:48-57. [PMID: 23283664 PMCID: PMC3539213 DOI: 10.1002/ajpa.22183] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Accepted: 10/03/2012] [Indexed: 01/15/2023]
Abstract
Growth, development, and decline of the human skeleton are of central importance to physical anthropology. All processes of skeletal growth (longitudinal growth as well as gains and losses of bone mass) are subjected to environmental and genetic influences. These influences, and their relative contributions to the phenotype, can be asserted at any stage of life. We present here the gross phenotypic and genetic landscapes of four skeletal traits, and show how they vary across the life span. Phenotypic sex differences are found in bone diameter and cortical index (a ratio of cortical thickness over bone diameter) at a very early age and continue throughout most of life. Sexual dimorphism in summed cortical thickness and bone length, however, is not evident until shortly after the pubertal growth spurt. Genetic contributions (heritability) to these skeletal phenotypes are generally moderate to high. Bone length and bone diameter (which both scale with body size) tend to have the highest heritability, with heritability of bone length fairly stable across ages (with a notable dip in early childhood) and that of bone diameter peaking in early childhood. The bone traits summed cortical thickness and cortical index that may better reflect bone mass, a more plastic phenomenon, have slightly lower genetic influences, on average. Results from our phenotypic and genetic landscapes serve three key purposes: 1) demonstration of the integrated nature of the genetic and environmental underpinnings of skeletal form, 2) identification of periods of bone's relative sensitivity to genetic and environmental influences, 3) and stimulation of hypotheses predicting the effects of exposure to environmental variables on the skeleton, given variation in the underlying genetic architecture.
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Affiliation(s)
- Dana L Duren
- Division of Morphological Sciences and Biostatistics, Lifespan Health Research Center, Department of Community Health, Boonshoft School of Medicine, Wright State University, Dayton, OH 45420, USA.
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Kelaita MA, Cortés-Ortiz L. Morphological variation of genetically confirmed Alouatta Pigra × A. palliata hybrids from a natural hybrid zone in Tabasco, Mexico. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2012; 150:223-34. [PMID: 23225250 DOI: 10.1002/ajpa.22196] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Accepted: 10/24/2012] [Indexed: 11/08/2022]
Abstract
While hybridization has been reported for a large number of primate taxa, there is a general lack of data on hybrid morphology for wild individuals with known genetic ancestry. A confirmed hybrid zone for the closely related Neotropical primates Alouatta palliata and A. pigra has provided a unique opportunity to study primate hybrid morphological variation. Here we used molecular evidence based on mitochondrial, Y-chromosome, and autosomal data to assess hybrid ancestry. We conducted univariate and multivariate statistical comparisons of morphometric data collected from individuals both outside and within the hybrid zone in Tabasco, Mexico. Our results show that of all the hybrids detected (N = 128), only 12% of them were approximately genetically intermediate, and none of them were first generation hybrids. Univariate pairwise comparisons among parental individuals, multigenerational backcrossed hybrids, and intermediate hybrids showed that overall, multigenerational backcrossed hybrids resemble the parental species with which they share most of their alleles. Conversely, intermediates were highly variable. Similarly, principal component analysis depicts an overlap between the parental species and their backcrosses when considering overall morphological differences. Finally, discriminant function analysis of the morphological variables was overall unreliable for classifying individuals into their assigned genotypic classes. Taken together, our results suggest that primate natural hybridization studies should incorporate molecular methods for determining ancestry, because morphology may not always be a reliable indicator of hybrid status. Hybrid zones could comprise a large number of multigenerational backcrossed hybrids that are indistinguishable from the parental species. The implications for studying hybridization in the primate fossil record are discussed.
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Affiliation(s)
- Mary A Kelaita
- Department of Anthropology, University of Texas at San Antonio, San Antonio, TX 78249-1644, USA.
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Ackermann RR. Phenotypic traits of primate hybrids: Recognizing admixture in the fossil record. Evol Anthropol 2011. [DOI: 10.1002/evan.20288] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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ELTON SARAH, DUNN JASON, CARDINI ANDREA. Size variation facilitates population divergence but does not explain it all: an example study from a widespread African monkey. Biol J Linn Soc Lond 2010. [DOI: 10.1111/j.1095-8312.2010.01504.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Ackermann RR, Bishop JM. Morphological and molecular evidence reveals recent hybridization between gorilla taxa. Evolution 2009; 64:271-90. [PMID: 19804402 DOI: 10.1111/j.1558-5646.2009.00858.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Molecular studies have demonstrated a deep lineage split between the two gorilla species, as well as divisions within these taxa; estimates place this divergence in the mid-Pleistocene, with gene flow continuing until approximately 80,000 years ago. Here, we present analyses of skeletal data indicating the presence of substantial recent gene flow among gorillas at all taxonomic levels: between populations, subspecies, and species. Complementary analyses of DNA sequence variation suggest that low-level migration occurred primarily in a westerly-to-easterly direction. In western gorillas, the locations of hybrid phenotypes map closely to expectations based on population refugia and riverine barrier hypotheses, supporting the presence of significant vicariance-driven structuring and occasional admixture within this taxon. In eastern lowland gorillas, the high frequency of hybrid phenotypes is surprising, suggesting that this region represents a zone of introgression between eastern gorillas and migrants from the west, and underscoring the conservation priority of this critically endangered group. These results highlight the complex nature of evolutionary divergence in this genus, indicate that historical gene flow has played a major role in structuring gorilla diversity, and demonstrate that our understanding of the evolutionary processes responsible for shaping biodiversity can benefit immensely from consideration of morphological and molecular data in conjunction.
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Affiliation(s)
- Rebecca Rogers Ackermann
- Department of Archaeology, Faculty of Science, University of Cape Town, Private Bag, Rondebosch 7701, South Africa.
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Charpentier MJE, Tung J, Altmann J, Alberts SC. Age at maturity in wild baboons: genetic, environmental and demographic influences. Mol Ecol 2008; 17:2026-40. [PMID: 18346122 DOI: 10.1111/j.1365-294x.2008.03724.x] [Citation(s) in RCA: 126] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
The timing of early life-history events, such as sexual maturation and first reproduction, can greatly influence variation in individual fitness. In this study, we analysed possible sources of variation underlying different measures of age at social and physical maturation in wild baboons in the Amboseli basin, Kenya. The Amboseli baboons are a natural population primarily comprised of yellow baboons (Papio cynocephalus) that occasionally hybridize with anubis baboons (Papio anubis) from outside the basin. We found that males and females differed in the extent to which various factors influenced their maturation. Surprisingly, we found that male maturation was most strongly related to the proportion of anubis ancestry revealed by their microsatellite genotypes: hybrid males matured earlier than yellow males. In contrast, although hybrid females reached menarche slightly earlier than yellow females, maternal rank and the presence of maternal relatives had the largest effects on female maturation, followed by more modest effects of group size and rainfall. Our results indicate that a complex combination of demographic, genetic, environmental, and maternal effects contribute to variation in the timing of these life-history milestones.
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Affiliation(s)
- M J E Charpentier
- Department of Biology, Duke University, PO Box 90338, Durham, NC 27708, USA.
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Couette S. [Morphologic and genetic differentiation of night monkey (Aotus infulatus, Primates, Platyrrhinians, Cebidae) populations from the right and left banks of Rio Tocantins (Brazil)]. C R Biol 2007; 330:148-58. [PMID: 17303542 DOI: 10.1016/j.crvi.2006.12.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2006] [Revised: 12/12/2006] [Accepted: 12/12/2006] [Indexed: 11/21/2022]
Abstract
The cranial morphology of 28 specimens of night monkeys (genus Aotus) was examined using three-dimensional geometrical morphometrics. New results of the morphological differences between two populations of Aotus infulatus from both banks of the Rio Tocantins are proposed. These morphological results totally agree with the genetic distinction of these populations proposed by Schneider -- and Sampaio --, and probably point out recent rapid evolutive changes for this species. Our morphometric results can be used for taxonomic, but also for medical research, as the susceptibility to malaria of night monkeys is variable between species.
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Affiliation(s)
- Sébastien Couette
- UMR-CNRS 5561, Biogéosciences et Laboratoire EPHE, Centre des Sciences de la Terre, Université de Bourgogne, 6, bd Gabriel, 21000 Dijon, France.
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Ackermann RR, Rogers J, Cheverud JM. Identifying the morphological signatures of hybridization in primate and human evolution. J Hum Evol 2006; 51:632-45. [PMID: 16962160 DOI: 10.1016/j.jhevol.2006.07.009] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2006] [Revised: 05/25/2006] [Accepted: 07/18/2006] [Indexed: 11/24/2022]
Abstract
Recent studies point to contact and possible admixture among contemporaneous hominin species during the Plio-Pleistocene. However, detection of hybridization in fossils-and especially fossil hominins-is contentious, and it is hindered in large part by our lack of understanding about how morphological hybridity is manifested in the primate skeleton. Here, we report on a study of known-pedigree, purebred yellow and olive baboons (n = 112) and their hybrids (n = 57), derived from the baboon colony of the Southwest Foundation for Biomedical Research. The hybrids were analyzed in two different groups: (1) F1 = olive x yellow first-generation hybrids; (2) B1 = olive x F1 backcross hybrids. Thirty-nine metric variables were tested for heterosis and dysgenesis. Nonmetric data were also collected from the crania. Results show that these primate hybrids are somewhat heterotic relative to their parental populations, are highly variable, and display novel phenotypes. These effects are most evident in the dentition and probably indicate the mixing of two separately coadapted genomes and the breakdown in the coordination of early development, despite the fact that these populations diverged fairly recently. Similar variation is also observed in museum samples drawn from natural hybrid zones. The results offer a strategy for detecting hybrid zones in the fossil record; implications for interpreting the hominin fossil record are discussed.
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Schillaci MA, Froehlich JW, Supriatna J, Jones-Engel L. The effects of hybridization on growth allometry and craniofacial form in Sulawesi macaques. J Hum Evol 2005; 49:335-69. [PMID: 15996717 DOI: 10.1016/j.jhevol.2005.04.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2004] [Revised: 04/08/2005] [Accepted: 04/25/2005] [Indexed: 11/19/2022]
Abstract
The present research investigates the effects of hybridization between Macaca maurus and M. tonkeana on adult male form and patterns of growth allometry. Comparisons of adult hybrid mean phenotypic values with the adult averages of the parental species indicate a condition of heterosis for cranial vault length and crown-rump length. Negative heterosis is indicated for body mass. Regression parameters describing growth allometry are generated for four craniofacial measurement variables and one body measurement using both least squares and reduced major axis regression. Comparisons of hybrid and parental regression slopes and intercepts using analysis of covariance and t-tests suggest that there is a hybrid pattern of growth allometry characterized by an increase in regression slope values coupled with lower intercept values compared to those of the parental species and the parental averages for most regression parameters. Multivariate analyses of the adult and ontogenetic morphometric data indicate significant differences across species taxa in form and shape during development and adulthood. Our finding of significant differences between hybrids and their parental taxa in growth allometry and craniofacial form and shape during development challenges the assumption often made regarding the reproductive and taxonomic significance of observed ontogenetic divergence between Neandertals and modern humans. We propose that anthropological primatology, with its goal of developing nonhuman primate models for investigating human evolution, can provide a biologically relevant means by which to empirically estimate the taxonomic significance of morphological and ontogenetic divergence observed in the hominid fossil record.
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Affiliation(s)
- Michael A Schillaci
- Department of Social Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ontario, M1C 1A4, Canada.
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