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Olivier CA, Martin JS, Pilisi C, Agnani P, Kauffmann C, Hayes L, Jaeggi AV, Schradin C. Primate social organization evolved from a flexible pair-living ancestor. Proc Natl Acad Sci U S A 2024; 121:e2215401120. [PMID: 38154063 PMCID: PMC10769843 DOI: 10.1073/pnas.2215401120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Accepted: 10/26/2023] [Indexed: 12/30/2023] Open
Abstract
Explaining the evolution of primate social organization has been fundamental to understand human sociality and social evolution more broadly. It has often been suggested that the ancestor of all primates was solitary and that other forms of social organization evolved later, with transitions being driven by various life history traits and ecological factors. However, recent research showed that many understudied primate species previously assumed to be solitary actually live in pairs, and intraspecific variation in social organization is common. We built a detailed database from primary field studies quantifying the number of social units expressing different social organizations in each population. We used Bayesian phylogenetic models to infer the probability of each social organization, conditional on several socioecological and life history predictors. Here, we show that when intraspecific variation is accounted for, the ancestral social organization of primates was inferred to be variable, with the most common social organization being pair-living but with approximately 10 to 20% of social units of the ancestral population deviating from this pattern by being solitary living. Body size and activity patterns had large effects on transitions between types of social organizations. As in other mammalian clades, pair-living is closely linked to small body size and likely more common in ancestral species. Our results challenge the assumption that ancestral primates were solitary and that pair-living evolved afterward emphasizing the importance of focusing on field data and accounting for intraspecific variation, providing a flexible statistical framework for doing so.
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Affiliation(s)
- Charlotte-Anaïs Olivier
- Institut Pluridisciplinaire Hubert Curien, CNRS, Department of Ethology and Evolutionary Physiology, University of Strasbourg, Strasbourg67200, France
- School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg2050, South Africa
| | - Jordan S. Martin
- Human Ecology Group, Institute of Evolutionary Medicine, University of Zurich, ZurichCH-8057, Switzerland
| | - Camille Pilisi
- Institut Pluridisciplinaire Hubert Curien, CNRS, Department of Ethology and Evolutionary Physiology, University of Strasbourg, Strasbourg67200, France
| | - Paul Agnani
- Institut Pluridisciplinaire Hubert Curien, CNRS, Department of Ethology and Evolutionary Physiology, University of Strasbourg, Strasbourg67200, France
| | - Cécile Kauffmann
- Institut Pluridisciplinaire Hubert Curien, CNRS, Department of Ethology and Evolutionary Physiology, University of Strasbourg, Strasbourg67200, France
| | - Loren Hayes
- Department of Biology, Geology, and Environmental Science, University of Tennessee, Chattanooga37403, TN
| | - Adrian V. Jaeggi
- Human Ecology Group, Institute of Evolutionary Medicine, University of Zurich, ZurichCH-8057, Switzerland
| | - C. Schradin
- Institut Pluridisciplinaire Hubert Curien, CNRS, Department of Ethology and Evolutionary Physiology, University of Strasbourg, Strasbourg67200, France
- School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg2050, South Africa
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Lee PC. Groups, grouping and networks: dynamic unanswered questions for primatologists. Primates 2022; 63:187-193. [PMID: 35412094 DOI: 10.1007/s10329-022-00988-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 03/26/2022] [Indexed: 10/18/2022]
Affiliation(s)
- Phyllis C Lee
- Behaviour and Evolution Research Group and Scottish Primate Research Group, Psychology, Faculty of Natural Sciences, University of Stirling, Stirling, UK.
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DeTroy SE, Ross CT, Cronin KA, van Leeuwen EJ, Haun DB. Cofeeding tolerance in chimpanzees depends on group composition: a longitudinal study across four communities. iScience 2021; 24:102175. [PMID: 33733060 PMCID: PMC7940988 DOI: 10.1016/j.isci.2021.102175] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 09/21/2020] [Accepted: 02/08/2021] [Indexed: 01/26/2023] Open
Abstract
Social tolerance is generally treated as a stable, species-specific characteristic. Recent research, however, has questioned this position and emphasized the importance of intraspecific variation. We investigate the temporal stability of social tolerance in four groups of sanctuary-housed chimpanzees over eight years using a commonly employed measure: experimental cofeeding tolerance. We then draw on longitudinal data on the demographic composition of each group to identify the factors associated with cofeeding tolerance. We find appreciable levels of variation in cofeeding tolerance across both groups and years that correspond closely to changes in group-level demographic composition. For example, cofeeding tolerance is lower when there are many females with young infants. These results suggest that social tolerance may be a "responding trait" of chimpanzee sociality, reflecting individual-level behavioral responses to social changes. Additional, experimental research is needed to better model the causal drivers of social tolerance within and among species.
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Affiliation(s)
- Sarah E. DeTroy
- Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
- Department for Early Child Development and Culture, Faculty of Education, Leipzig University, Jahnallee 59, 04109 Leipzig, Germany
| | - Cody T. Ross
- Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
| | - Katherine A. Cronin
- Animal Welfare Science Program, Lincoln Park Zoo, 2001 N Clark St, Chicago, IL 60614, USA
- Committee on Evolutionary Biology, University of Chicago, 1025 E. 57th Street, Chicago, IL 60637, USA
| | - Edwin J.C. van Leeuwen
- Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
- Behavioural Ecology and Ecophysiology Group, Department of Biology, University of Antwerp, Universiteitsplein 1, 2610 Antwerp, Belgium
- Centre for Research and Conservation, Royal Zoological Society of Antwerp, Koningin Astridplein 20-26, 2018 Antwerp, Belgium
| | - Daniel B.M. Haun
- Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany
- Department for Early Child Development and Culture, Faculty of Education, Leipzig University, Jahnallee 59, 04109 Leipzig, Germany
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Kappeler PM, Pozzi L. Evolutionary transitions toward pair living in nonhuman primates as stepping stones toward more complex societies. SCIENCE ADVANCES 2019; 5:eaay1276. [PMID: 32064318 PMCID: PMC6989303 DOI: 10.1126/sciadv.aay1276] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 10/30/2019] [Indexed: 06/03/2023]
Abstract
Nonhuman primate societies vary tremendously in size and composition, but how and why evolutionary transitions among different states occurred remains highly controversial. In particular, how many times pair living evolved and the social states of the ancestors of pair- and group-living species remains contentious. We examined evolutionary transitions in primate social evolution by using new, independent categorizations of sociality and different phylogenetic hypotheses with a vastly expanded dataset. Using Bayesian phylogenetic comparative methods, we consistently found the strongest support for a model that invokes frequent transitions between solitary ancestors and pair-living descendants, with the latter giving rise to group-living species. This result was robust to systematic variation in social classification, sample size, and phylogeny. Our analyses therefore indicate that pair living was a stepping stone in the evolution of structurally more complex primate societies, a result that bolsters the role of kin selection in social evolution.
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Affiliation(s)
- Peter M. Kappeler
- Behavioral Ecology and Sociobiology Unit, German Primate Center–Leibniz Institute for Primate Research, Göttingen, Germany
- Department of Sociobiology/Anthropology, University of Göttingen, Göttingen, Germany
| | - Luca Pozzi
- Department of Anthropology, The University of Texas at San Antonio, San Antonio, TX, USA
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5
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Garber PA, Caselli CB, McKenney AC, Abreu F, De la Fuente MF, Araújo A, de Fatima Arruda M, Souto A, Schiel N, Bicca-Marques JC. Trait variation and trait stability in common marmosets (Callithrix jacchus) inhabiting ecologically distinct habitats in northeastern Brazil. Am J Primatol 2019; 81:e23018. [PMID: 31192487 DOI: 10.1002/ajp.23018] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 04/29/2019] [Accepted: 05/23/2019] [Indexed: 01/11/2023]
Abstract
Understanding the set of factors that promote and constrain a species' ability to exploit ecologically distinct habitats is central for addressing questions of intraspecific variability in behavior and morphology. In this study, we compared newly collected data with published data on body measurements, group size and composition, daily path length, home range, and reproductive output in wild common marmosets naturally inhabiting two contrasting environments in northeastern Brazil: the Atlantic Forest (AF), which is characterized by high biodiversity and reduced seasonality in food availability and the Caatinga (CAT), which is characterized by a severe hot and dry season lasting from 5 to 11 months, drought-resistant plant species, and reduced primary productivity. Despite marked differences in ecological conditions, CAT marmosets and AF marmosets differed minimally in daily path length, home range, reproductive output, and infant survivorship. CAT marmosets were found to live in smaller groups containing fewer adult females than AF marmosets, and also were characterized by a greater surface area to body mass ratio, a trait that may represent an adaptation to the hot and dry conditions of the Caatinga. We propose that in conjunction with body mass reduction, minor adjustments in behavior, the exploitation of cacti as a source of water and nutrients, and access to exudates as a dependable year-round food resource, common marmosets successfully used the same adaptive pattern to maintain high reproductive output and infant survivorship in exploiting these two ecologically distinct environments.
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Affiliation(s)
- Paul A Garber
- Department of Anthropology and Program in Ecology, Evolution, and Conservation Biology, University of Illinois, Urbana, Illinois
| | - Christini B Caselli
- Departamento de Biologia, Laboratório de Etologia Teórica e Aplicada, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil
| | - Anna C McKenney
- Natural Resources and Environmental Sciences, University of Illinois, Urbana, Illinois
| | - Filipa Abreu
- Departamento de Biologia, Laboratório de Etologia Teórica e Aplicada, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil
| | - Maria Fernanda De la Fuente
- Departamento de Biologia, Laboratório de Etologia Teórica e Aplicada, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil
| | - Arrilton Araújo
- Departamento e Fisiologia, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
| | - Maria de Fatima Arruda
- Departamento e Fisiologia, Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil
| | - Antonio Souto
- Departamento de Zoologia, Laboratório de Etologia, Universidade Federal de Pernambuco, Recife, PE, Brazil
| | - Nicola Schiel
- Departamento de Biologia, Laboratório de Etologia Teórica e Aplicada, Universidade Federal Rural de Pernambuco, Recife, PE, Brazil
| | - Júlio César Bicca-Marques
- Escola de Ciências, Laboratório de Primatologia, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, RS, Brazil
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Abstract
Environmental stress on primate populations can take many forms. Abiotic factors, such as temperature and precipitation, may directly influence the behavior of primates owing to physiological demands of thermoregulation or through indirect influences on vegetation that primates rely on for food. These effects can also scale up to the macro scale, impacting primate distributions and evolution. Primates also encounter stress during interactions within and between species (i.e., biotic interactions). For example, selective pressure from male-perpetrated infanticide can drive the development of female counterstrategies and can impact life-history traits. Predation on primates can modify group size, ranging behavior, and habitat use. Finally, humans have influenced primate populations for millennia. More recently, hunting, habitat disturbance, disease, and climate change have increased in frequency and severity with detrimental impacts on primate populations worldwide. These effects and recent evidence from camera traps emphasize the importance of maintaining protected areas for conserving primate populations.
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Affiliation(s)
- Jason M. Kamilar
- Department of Anthropology and Graduate Program in Organismic and Evolutionary Biology, University of Massachusetts, Amherst, Massachusetts 01002, USA
| | - Lydia Beaudrot
- Department of Ecology and Evolutionary Biology, and Michigan Society of Fellows, University of Michigan, Ann Arbor, Michigan 48109, USA
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8
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Robbins MM, Robbins AM. Variation in the social organization of gorillas: Life history and socioecological perspectives. Evol Anthropol 2018; 27:218-233. [PMID: 30325554 DOI: 10.1002/evan.21721] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 07/18/2018] [Accepted: 08/06/2018] [Indexed: 01/29/2023]
Abstract
A focus of socioecological research is to understand how ecological, social, and life history factors influence the variability of social organization within and between species. The genus Gorilla exhibits variability in social organization with western gorilla groups being almost exclusively one-male, yet approximately 40% of mountain gorilla groups are multimale. We review five ultimate causes for the variability in social organization within and among gorilla populations: human disturbance, ecological constraints on group size, risk of infanticide, life history patterns, and population density. We find the most evidence for the ecological constraints and life history hypotheses, but an over-riding explanation remains elusive. The variability may hinge on variation in female dispersal patterns, as females seek a group of optimal size and with a good protector male. Our review illustrates the challenges of understanding why the social organization of closely related species may deviate from predictions based on socioecological and life history theory.
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Affiliation(s)
- Martha M Robbins
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - Andrew M Robbins
- Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
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9
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Fission-fusion dynamics as a temporally and spatially flexible behavioral strategy in spider monkeys. Behav Ecol Sociobiol 2018. [DOI: 10.1007/s00265-018-2562-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Strier KB. Primate social behavior. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2018; 165:801-812. [DOI: 10.1002/ajpa.23369] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2017] [Revised: 11/12/2017] [Accepted: 11/14/2017] [Indexed: 01/09/2023]
Affiliation(s)
- Karen B. Strier
- Department of Anthropology; University of Wisconsin-Madison; Madison Wisconsin, 53706
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11
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Primate Responses to Changing Environments in the Anthropocene. PRIMATE LIFE HISTORIES, SEX ROLES, AND ADAPTABILITY 2018. [DOI: 10.1007/978-3-319-98285-4_14] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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12
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Strier KB. What does variation in primate behavior mean? AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2017; 162 Suppl 63:4-14. [PMID: 28105716 DOI: 10.1002/ajpa.23143] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 09/29/2016] [Accepted: 10/07/2016] [Indexed: 01/15/2023]
Abstract
Interest in intraspecific behavioral variation has grown with concerns about the ability of primates to adapt to the rapidly changing ecological and demographic conditions that threaten their survival. Now, in addition to identifying the causes and phylogenetic distribution of normative, species-specific behavior patterns for interspecific comparisons, there is widespread recognition of the need to incorporate intraspecific variation. This variation is evident across groups and populations of the same species as well over the long histories of single groups of long-lived, socially complex animals with overlapping generations. Yet, analyses of both cross-sectional and longitudinal data require explicit criteria about how to classify and interpret behavioral variation, and must be sensitive to the limitations of space-for-time substitutions in these comparisons. Current approaches have made great advances, but there remains an urgent challenge of understanding intraspecific variation in a way that will facilitate the development of new predictive models to assess population resilience and extinction risks in the face of climate change and other anthropogenic influences.
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Affiliation(s)
- Karen B Strier
- Department of Anthropology, University of Wisconsin-Madison, Madison, WI, 53705
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13
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Huang ZP, Bian K, Liu Y, Pan RL, Qi XG, Li BG. Male Dispersal Pattern in Golden Snub-nosed Monkey (Rhinopithecus roxellana) in Qinling Mountains and its Conservation Implication. Sci Rep 2017; 7:46217. [PMID: 28492280 PMCID: PMC5425912 DOI: 10.1038/srep46217] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 03/13/2017] [Indexed: 11/25/2022] Open
Abstract
Golden snub-nosed monkey (Rhinopithecus roxellana) is one of the most endangered primate species found in China, exhibiting multilevel society consisting of several one-male-females together with their offspring units (OMU), and all-male units (AMU). Female dispersal patterns of the species within herd have been well documented, whereas those of the males within or between herds are still poorly understood. Our results based a long-term observation indicate that more than half of sub-adult males, and half of the deposed males that stayed a short period in OMU disperse between herds, three of them established their own OMU in new herd after the dispersal. Smaller number of the sub-adult and adult males, compared with adult females, stayed in natal herd, implying sub-adult males started dispersing and male-biased dispersal occurred between herds. High frequencies of resident males were wounded as their OUMs were taken over, and resident males co-operation defend bachelor males were found. Mating competition among males within the herd may have contributed to the scenarios of male-biased dispersal. The results also suggest that maintaining connection between isolated herds and establishing the corridors among the fragmented habitats for the species will greatly benefit increasing its gene flow and promoting conservation status.
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Affiliation(s)
- Zhi-Pang Huang
- College of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, China
- Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi’an, Shaanxi 710069, China
- Institute of Eastern-Himalaya Biodiversity Research, Dali University, Dali, Yunnan 671003, China
| | - Kun Bian
- College of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, China
- Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi’an, Shaanxi 710069, China
| | - Yi Liu
- College of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, China
- Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi’an, Shaanxi 710069, China
| | - Ru-Liang Pan
- College of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, China
- Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi’an, Shaanxi 710069, China
- School of Anatomy, Physiology and Human Biology, The University of Western Australia 6009, Perth, Western Australia, Australia
| | - Xiao-Guang Qi
- College of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, China
- Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi’an, Shaanxi 710069, China
| | - Bao-Guo Li
- College of Life Sciences, Northwest University, Xi’an, Shaanxi 710069, China
- Shaanxi Key Laboratory for Animal Conservation, Northwest University, Xi’an, Shaanxi 710069, China
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15
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Gutierrez-Ibanez C, Iwaniuk AN, Wylie DR. Relative Brain Size Is Not Correlated with Display Complexity in Manakins: A Reanalysis of Lindsay et al. (2015). BRAIN, BEHAVIOR AND EVOLUTION 2016; 87:223-6. [PMID: 27256814 DOI: 10.1159/000446312] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Sandel AA, Miller JA, Mitani JC, Nunn CL, Patterson SK, Garamszegi LZ. Assessing sources of error in comparative analyses of primate behavior: Intraspecific variation in group size and the social brain hypothesis. J Hum Evol 2016; 94:126-33. [PMID: 27178464 DOI: 10.1016/j.jhevol.2016.03.007] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 03/11/2016] [Accepted: 03/12/2016] [Indexed: 10/21/2022]
Abstract
Phylogenetic comparative methods have become standard for investigating evolutionary hypotheses, including in studies of human evolution. While these methods account for the non-independence of trait data due to phylogeny, they often fail to consider intraspecific variation, which may lead to biased or erroneous results. We assessed the degree to which intraspecific variation impacts the results of comparative analyses by investigating the "social brain" hypothesis, which has provided a framework for explaining complex cognition and large brains in humans. This hypothesis suggests that group life imposes a cognitive challenge, with species living in larger social groups having comparably larger neocortex ratios than those living in smaller groups. Primates, however, vary considerably in group size within species, a fact that has been ignored in previous analyses. When within-species variation in group size is high, the common practice of using a mean value to represent the species may be inappropriate. We conducted regression and resampling analyses to ascertain whether the relationship between neocortex ratio and group size across primate species persists after controlling for within-species variation in group size. We found that in a sample of 23 primates, 70% of the variation in group size was due to between-species variation. Controlling for within-species variation in group size did not affect the results of phylogenetic analyses, which continued to show a positive relationship between neocortex ratio and group size. Analyses restricted to non-monogamous primates revealed considerable intraspecific variation in group size, but the positive association between neocortex ratio and group size remained even after controlling for within-species variation in group size. Our findings suggest that the relationship between neocortex size and group size in primates is robust. In addition, our methods and associated computer code provide a way to assess and account for intraspecific variation in other comparative analyses of primate evolution.
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Affiliation(s)
- Aaron A Sandel
- Department of Anthropology, University of Michigan, Ann Arbor, MI 48109, USA.
| | - Jordan A Miller
- Center for the Advanced Study of Human Paleobiology, The George Washington University, Washington, DC 20052, USA
| | - John C Mitani
- Department of Anthropology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Charles L Nunn
- Department of Evolutionary Anthropology and the Duke Global Health Institute, Duke University, Durham, NC 27708, USA
| | - Samantha K Patterson
- School of Human Evolution and Social Change, Arizona State University, Tempe, AZ 85287, USA
| | - László Zsolt Garamszegi
- Department of Evolutionary Ecology, Estación Biológica de Doñana-CSIC, 41092, Seville, Spain
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Borgi M, Majolo B. Facial width-to-height ratio relates to dominance style in the genus Macaca. PeerJ 2016; 4:e1775. [PMID: 27019780 PMCID: PMC4806626 DOI: 10.7717/peerj.1775] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Accepted: 02/17/2016] [Indexed: 11/20/2022] Open
Abstract
Background. Physical, visual, chemical, and auditory cues signalling fighting ability have independently evolved in many animal taxa as a means to resolve conflicts without escalating to physical aggression. Facial width-to-height ratio (fWHR, i.e., the relative width to height of the face) has been associated with dominance-related phenotypes both in humans and in other primates. In humans, faces with a larger fWHR are perceived as more aggressive. Methods. We examined fWHR variation among 11 species of the genus Macaca. Macaques have been grouped into four distinct categories, from despotic to tolerant, based on their female dominance style. Female dominance style is related to intra- and inter-sexual competition in both males and females and is the result of different evolutionary pressure across species. We used female dominance style as a proxy of intra-/inter-sexual competition to test the occurrence of correlated evolution between competitive regimes and dominance-related phenotypes. fWHR was calculated from 145 2D photographs of male and female adult macaques. Results. We found no phylogenetic signal on the differences in fWHR across species in the two sexes. However, fWHR was greater, in females and males, in species characterised by despotic female dominance style than in tolerant species. Discussion. Our results suggest that dominance-related phenotypes are related to differences in competitive regimes and intensity of inter- and intra-sexual selection across species.
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Affiliation(s)
- Marta Borgi
- School of Psychology, University of Lincoln, Lincoln, United Kingdom; Department of Cell Biology and Neurosciences, Istituto Superiore di Sanità, Rome, Italy
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Kurki HK, Decrausaz SL. Shape variation in the human pelvis and limb skeleton: Implications for obstetric adaptation. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2015; 159:630-8. [PMID: 26699269 DOI: 10.1002/ajpa.22922] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 11/26/2015] [Accepted: 11/28/2015] [Indexed: 12/22/2022]
Abstract
OBJECTIVES Under the obstetrical dilemma (OD) hypothesis, selection acts on the human female pelvis to ensure a sufficiently sized obstetric canal for birthing a large-brained, broad shouldered neonate, while bipedal locomotion selects for a narrower and smaller pelvis. Despite this female-specific stabilizing selection, variability of linear dimensions of the pelvic canal and overall size are not reduced in females, suggesting shape may instead be variable among females of a population. Female canal shape has been shown to vary among populations, while male canal shape does not. Within this context, we examine within-population canal shape variation in comparison with that of noncanal aspects of the pelvis and the limbs. MATERIALS AND METHODS Nine skeletal samples (total female n = 101, male n = 117) representing diverse body sizes and shapes were included. Principal components analysis was applied to size-adjusted variables of each skeletal region. A multivariate variance was calculated using the weighted PC scores for all components in each model and F-ratios used to assess differences in within-population variances between sexes and skeletal regions. RESULTS Within both sexes, multivariate canal shape variance is significantly greater than noncanal pelvis and limb variances, while limb variance is greater than noncanal pelvis variance in some populations. Multivariate shape variation is not consistently different between the sexes in any of the skeletal regions. DISCUSSION Diverse selective pressures, including obstetrics, locomotion, load carrying, and others may act on canal shape, as well as genetic drift and plasticity, thus increasing variation in morphospace while protecting obstetric sufficiency.
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Affiliation(s)
- Helen K Kurki
- Department of Anthropology, University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Sarah-Louise Decrausaz
- Division of Biological Anthropology, Department of Archaeology and Anthropology, University of Cambridge, Cambridge, CB2 3QG
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19
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Strier KB, Lee PC, Ives AR. Behavioral flexibility and the evolution of primate social states. PLoS One 2014; 9:e114099. [PMID: 25470593 PMCID: PMC4254976 DOI: 10.1371/journal.pone.0114099] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Accepted: 11/03/2014] [Indexed: 11/18/2022] Open
Abstract
Comparative approaches to the evolution of primate social behavior have typically involved two distinct lines of inquiry. One has focused on phylogenetic analyses that treat social traits as static, species-specific characteristics; the other has focused on understanding the behavioral flexibility of particular populations or species in response to local ecological or demographic variables. Here, we combine these approaches by distinguishing between constraining traits such as dispersal regimes (male, female, or bi-sexual), which are relatively invariant, and responding traits such as grouping patterns (stable, fission-fusion, sometimes fission-fusion), which can reflect rapid adjustments to current conditions. Using long-term and cross-sectional data from 29 studies of 22 species of wild primates, we confirm that dispersal regime exhibits a strong phylogenetic signal in our sample. We then show that primate species with high variation in group size and adult sex ratios exhibit variability in grouping pattern (i.e., sometimes fission-fusion) with dispersal regime constraining the grouping response. When assessing demographic variation, we found a strong positive relationship between the variability in group size over time and the number of observation years, which further illustrates the importance of long-term demographic data to interpretations of social behavior. Our approach complements other comparative efforts to understand the role of behavioral flexibility by distinguishing between constraining and responding traits, and incorporating these distinctions into analyses of social states over evolutionary and ecological time.
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Affiliation(s)
- Karen B. Strier
- Department of Anthropology, University of Wisconsin-Madison, Madison, Wisconsin 53705, United States of America
| | - Phyllis C. Lee
- Behaviour and Evolution Research Group, Psychology, School of Natural Sciences, University of Stirling, Stirling, FK9 4LA, United Kingdom
| | - Anthony R. Ives
- Department of Zoology, University of Wisconsin-Madison, Madison, Wisconsin 53705, United States of America
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