Thore J Bergman
Datos Biográficos
| ID | 667191 |
|---|---|
| NOMBRE | Thore J Bergman |
| NOMBRES | Thore J |
| APELLIDO | Bergman |
| FIRMA | BERGMAN T J |
| AFILIACIONES | University of Michigan |
| ORCID | 0000-0002-9615-5001 |
| VERIFICADO | Sí |
| TOTAL DE OBRAS | 28 |
| TOTAL DE CITAS | 82 |
| TOTAL COMO AUTOR | 28 |
| TOTAL COMO EDITOR | 0 |
| PRIMER AÑO DE PUBLICACIÓN | 2004 |
| AÑO MÁS RECIENTE DE PUBLICACIÓN | 2026 |
| ÍNDICE H | 4 |
The State of Our Knowledge About Social Knowledge in Platyrrhine Primates
Documenting the extent of social knowledge across primates is critical to understanding the evolution of complex social cognition. While decades of field and experimental research have explored the depth and breadth of social knowledge in catarrhine primates, comparable insights into platyrrhines remain limited. This review synthesizes the current state of knowledge about social cognition in platyrrhine monkeys—a socially, behaviorally, and ecolo…
Intergroup Encounters Among Wild White-Faced Capuchins (Cebus imitator) at a Densely Populated Field Site
Intergroup encounters (IGEs) are a major feature of social life for group-living primates, influencing access to resources, reproductive opportunities, and territory. We examined IGE frequency, intensity, and participation in a high-density population of wild white-faced capuchin monkeys ( Cebus imitator ) at the Capuchinos de Taboga research project in Guanacaste, Costa Rica, using 4 years of data on three capuchin groups (4,984 observation hour…
The Ontogeny of “Twitter” Calls in White‐Faced Capuchins ( Cebus imitator )
In stark contrast to our own highly plastic communicative abilities, nonhuman primate vocalizations were historically considered fixed and innate, with very little ability to learn or modify vocal signals. However, recent studies indicate that primate vocalizations do show evidence of developmental plasticity, most notably in their context and usage. We build on these studies by investigating developmental changes in one of the most common calls …
Leveling with Tinbergen
In 1963, Niko Tinbergen published his foundational manuscript identifying the four questions we ask in animal behavior— how does the behavior emerge across the lifespan (development); how does it work (mechanism); how and why did it evolve (evolution); and why is it adaptive (function). Tinbergen clarified that these ‘levels of analysis’ are complementary, not competing, thereby avoiding many fruitless scientific debates. However, the relationshi…
High density of white‐faced capuchins ( Cebus capucinus ) and habitat quality in the Taboga Forest of Costa Rica
Across the globe, primates are threatened by human activities. This is especially true for species found in tropical dry forests, which remain largely unprotected. Our ability to predict primate abundance in the face of human activity depends on different species' sensitivities as well as on the characteristics of the forest itself. We studied plant and primate distribution and abundance in the Taboga Forest, a 516‐ha tropical dry forest surround…
The structural and motivational role of the unique lip‐flip movement in the gelada ( Theropithecus gelada ) facial display repertoire
OBJECTIVES: Human language represents an extreme form of communicative complexity. Primate facial display complexity, which depends upon facial mobility, can be used as a model for the study of the evolution of communicative complexity. The gelada (Theropithecus gelada) is the only primate that can produce a lip-flip eversion. This study investigates the role of the lip-flip relative to the bared-teeth display to understand its role in generating…
From Mexico to Michigan and back
Evolutionary research benefits form the integration of laboratory and field components to determine factors and processes that affect the evolutionary trajectories of species. Our shared interest in understanding hybridization with genetic admixture as a process that may impact social, behavioral, and ecological features of primates, brought us together in a collaborative project aimed at addressing how vocal variation in two species of howler mo…
Reduced Introgression of Sex Chromosome Markers in the Mexican Howler Monkey (Alouatta palliata × A. pigra) Hybrid Zone
Interspecific hybridization allows the introgression or movement of alleles from one genome to another. While some genomic regions freely exchange alleles during hybridization, loci associated with reproductive isolation do not intermix. In many model organisms, the X chromosome displays limited introgression compared to autosomes owing to the presence of multiple loci associated with hybrid sterility or inviability (the “large X-effect”). Simila…
Temporal but Not Acoustic Plasticity in Hybrid Howler Monkey (Alouatta palliata × A. pigra) Loud Calls
Dorothy Cheney (1950–2018)
Graminivory and Fallback Foods
What Is (Not) a Baboon
Alouatta pigra males ignore A. palliata loud calls
Despite striking differences in vocalizations, A. palliata respond equally to calls from both species whereas A. pigra respond only to conspecifics. This apparent failure of A. pigra males to recognize interspecific rivals might have biased hybridization (F1 hybrids = male A. palliata x female A. pigra), a pattern previously hypothesized based on genetic analysis of hybrids. Given that A. pigra males could be losing reproductive opportunities to …
High mortality associated with tapeworm parasitism in geladas ( Theropithecus gelada ) in the Simien Mountains National Park, Ethiopia
Despite increasing appreciation for parasitism as an important component of primate ecology and evolution, surprisingly few studies have demonstrated the costs of helminth parasitism in primates. Detecting parasite-related costs in primates is particularly difficult because it requires detailed, long-term data on individual host reproductive success, survival, and parasitism. The identification of the larval tapeworm Taenia serialis in geladas un…
Female Reproductive Parameters in Wild Geladas (Theropithecus gelada)
Growth trajectories in wild geladas ( Theropithecus gelada )
Life history and socioecological factors have been linked to species-specific patterns of growth across female vertebrates. For example, greater maternal investment in offspring has been associated with more discrete periods of growth and reproduction. However, in primates it has been difficult to test such hypotheses because very few studies have obtained growth measurements from wild populations. Here we utilize a promising noninvasive photogra…
Striking differences in the loud calls of howler monkey sister species ( Alouatta pigra and A. palliata )
Comparing vocalizations across species is useful for understanding acoustic variation at mechanistic and evolutionary levels. Here, we take advantage of the divergent vocalizations of two closely related howler monkey species (Alouatta pigra and A. palliata) to better understand vocal evolution. In addition to comparing multiple acoustic and temporal features of roars and the calling bouts in which they are produced, we tested several predictions…
Acoustic and Temporal Variation in Gelada (Theropithecus gelada) Loud Calls Advertise Male Quality
Effect of ancestry on behavioral variation in two species of howler monkeys ( Alouatta pigra and A. palliata ) and their hybrids
Social differences between primate species may result from both flexible responses to current conditions or fixed differences across taxa, yet we know little about the relative importance of these factors. Here, we take advantage of a naturally occurring hybrid zone in Tabasco, Mexico to characterize the variation in social structure among two endangered howler monkey species, Alouatta pigra and A. palliata, and their hybrids. Work in pure popula…
Kinship and Dominance Rank Influence the Strength of Social Bonds in Female Geladas (Theropithecus gelada)
Social Knowledge and Signals in Primates
Primates are notable for having a rich and detailed understanding of their social environment and there has been great interest in the evolution and function of social knowledge in primates. Indeed, primates have been shown to have impressive understandings of not only other group members but also the complex relationships among them. To be useful, however, social knowledge requires memories from previous encounters and observations about individ…
Defining Higher Levels in the Multilevel Societies of Geladas (Theropithecus gelada)
Female philopatry and dominance patterns in wild geladas
Cercopithecines have a highly conserved social structure with strong female bonds and stable, maternally inherited linear dominance hierarchies. This system has been ascribed to the pervasiveness of female philopatry within the typical multi‐male, multi‐female social groups. We examined the relationship between female philopatry, dominance hierarchies, and reproduction in geladas ( Theropithecus gelada ), a species with an unusual multi‐leveled s…
Strong and Consistent Social Bonds Enhance the Longevity of Female Baboons
Chest Color and Social Status in Male Geladas (Theropithecus gelada)
Factors Affecting Reproduction and Mortality Among Baboons in the Okavango Delta, Botswana
Defining Higher Levels in the Multilevel Societies of Geladas (Theropithecus gelada)
Chest Color and Social Status in Male Geladas (Theropithecus gelada)
Kinship and Dominance Rank Influence the Strength of Social Bonds in Female Geladas (Theropithecus gelada)
Temporal but Not Acoustic Plasticity in Hybrid Howler Monkey (Alouatta palliata × A. pigra) Loud Calls
Reduced Introgression of Sex Chromosome Markers in the Mexican Howler Monkey (Alouatta palliata × A. pigra) Hybrid Zone
Interspecific hybridization allows the introgression or movement of alleles from one genome to another. While some genomic regions freely exchange alleles during hybridization, loci associated with reproductive isolation do not intermix. In many model organisms, the X chromosome displays limited introgression compared to autosomes owing to the presence of multiple loci associated with hybrid sterility or inviability (the “large X-effect”). Simila…
Graminivory and Fallback Foods
Female Reproductive Parameters in Wild Geladas (Theropithecus gelada)
Acoustic and Temporal Variation in Gelada (Theropithecus gelada) Loud Calls Advertise Male Quality
Factors Affecting Reproduction and Mortality Among Baboons in the Okavango Delta, Botswana
Infant mortality following male takeovers in wild geladas
Since Sugiyama's [1965] first observations of infanticide, empirical evidence from a multitude of primate species has supported the sexual selection hypothesis—the idea that males enhance their reproductive success by killing nonrelated, unweaned infants to hasten the mothers' return to fertility. Like other primates that live in social groups where paternity certainty is high, the social structure of geladas [ Theropithecus gelada ] suggests tha…
Behavioral variation and reproductive success of male baboons ( Papio anubis × Papio hamadryas ) in a hybrid social group
We take advantage of an array of hybrid baboons ( Papio anubis × Papio hamadryas ) living in the same social group to explore the causes and consequences of different male mating strategies. Male hamadryas hold one‐male units and exhibit a sustained, intense interest in adult females, regardless of the latter's reproductive state. Anubis baboons, by contrast, live in multi‐male, multi‐female groups where males compete for females only when the la…
Chest Color and Social Status in Male Geladas (Theropithecus gelada)
Strong and Consistent Social Bonds Enhance the Longevity of Female Baboons
Female philopatry and dominance patterns in wild geladas
Cercopithecines have a highly conserved social structure with strong female bonds and stable, maternally inherited linear dominance hierarchies. This system has been ascribed to the pervasiveness of female philopatry within the typical multi‐male, multi‐female social groups. We examined the relationship between female philopatry, dominance hierarchies, and reproduction in geladas ( Theropithecus gelada ), a species with an unusual multi‐leveled s…
Defining Higher Levels in the Multilevel Societies of Geladas (Theropithecus gelada)
Social Knowledge and Signals in Primates
Primates are notable for having a rich and detailed understanding of their social environment and there has been great interest in the evolution and function of social knowledge in primates. Indeed, primates have been shown to have impressive understandings of not only other group members but also the complex relationships among them. To be useful, however, social knowledge requires memories from previous encounters and observations about individ…
Effect of ancestry on behavioral variation in two species of howler monkeys ( Alouatta pigra and A. palliata ) and their hybrids
Social differences between primate species may result from both flexible responses to current conditions or fixed differences across taxa, yet we know little about the relative importance of these factors. Here, we take advantage of a naturally occurring hybrid zone in Tabasco, Mexico to characterize the variation in social structure among two endangered howler monkey species, Alouatta pigra and A. palliata, and their hybrids. Work in pure popula…
Kinship and Dominance Rank Influence the Strength of Social Bonds in Female Geladas (Theropithecus gelada)
Growth trajectories in wild geladas ( Theropithecus gelada )
Life history and socioecological factors have been linked to species-specific patterns of growth across female vertebrates. For example, greater maternal investment in offspring has been associated with more discrete periods of growth and reproduction. However, in primates it has been difficult to test such hypotheses because very few studies have obtained growth measurements from wild populations. Here we utilize a promising noninvasive photogra…
Striking differences in the loud calls of howler monkey sister species ( Alouatta pigra and A. palliata )
Comparing vocalizations across species is useful for understanding acoustic variation at mechanistic and evolutionary levels. Here, we take advantage of the divergent vocalizations of two closely related howler monkey species (Alouatta pigra and A. palliata) to better understand vocal evolution. In addition to comparing multiple acoustic and temporal features of roars and the calling bouts in which they are produced, we tested several predictions…
Acoustic and Temporal Variation in Gelada (Theropithecus gelada) Loud Calls Advertise Male Quality
High mortality associated with tapeworm parasitism in geladas ( Theropithecus gelada ) in the Simien Mountains National Park, Ethiopia
Despite increasing appreciation for parasitism as an important component of primate ecology and evolution, surprisingly few studies have demonstrated the costs of helminth parasitism in primates. Detecting parasite-related costs in primates is particularly difficult because it requires detailed, long-term data on individual host reproductive success, survival, and parasitism. The identification of the larval tapeworm Taenia serialis in geladas un…
Female Reproductive Parameters in Wild Geladas (Theropithecus gelada)
Graminivory and Fallback Foods
What Is (Not) a Baboon
Alouatta pigra males ignore A. palliata loud calls
Despite striking differences in vocalizations, A. palliata respond equally to calls from both species whereas A. pigra respond only to conspecifics. This apparent failure of A. pigra males to recognize interspecific rivals might have biased hybridization (F1 hybrids = male A. palliata x female A. pigra), a pattern previously hypothesized based on genetic analysis of hybrids. Given that A. pigra males could be losing reproductive opportunities to …
From Mexico to Michigan and back
Evolutionary research benefits form the integration of laboratory and field components to determine factors and processes that affect the evolutionary trajectories of species. Our shared interest in understanding hybridization with genetic admixture as a process that may impact social, behavioral, and ecological features of primates, brought us together in a collaborative project aimed at addressing how vocal variation in two species of howler mo…
Reduced Introgression of Sex Chromosome Markers in the Mexican Howler Monkey (Alouatta palliata × A. pigra) Hybrid Zone
Interspecific hybridization allows the introgression or movement of alleles from one genome to another. While some genomic regions freely exchange alleles during hybridization, loci associated with reproductive isolation do not intermix. In many model organisms, the X chromosome displays limited introgression compared to autosomes owing to the presence of multiple loci associated with hybrid sterility or inviability (the “large X-effect”). Simila…
Temporal but Not Acoustic Plasticity in Hybrid Howler Monkey (Alouatta palliata × A. pigra) Loud Calls
Dorothy Cheney (1950–2018)
High density of white‐faced capuchins ( Cebus capucinus ) and habitat quality in the Taboga Forest of Costa Rica
Across the globe, primates are threatened by human activities. This is especially true for species found in tropical dry forests, which remain largely unprotected. Our ability to predict primate abundance in the face of human activity depends on different species' sensitivities as well as on the characteristics of the forest itself. We studied plant and primate distribution and abundance in the Taboga Forest, a 516‐ha tropical dry forest surround…
The structural and motivational role of the unique lip‐flip movement in the gelada ( Theropithecus gelada ) facial display repertoire
OBJECTIVES: Human language represents an extreme form of communicative complexity. Primate facial display complexity, which depends upon facial mobility, can be used as a model for the study of the evolution of communicative complexity. The gelada (Theropithecus gelada) is the only primate that can produce a lip-flip eversion. This study investigates the role of the lip-flip relative to the bared-teeth display to understand its role in generating…
Leveling with Tinbergen
In 1963, Niko Tinbergen published his foundational manuscript identifying the four questions we ask in animal behavior— how does the behavior emerge across the lifespan (development); how does it work (mechanism); how and why did it evolve (evolution); and why is it adaptive (function). Tinbergen clarified that these ‘levels of analysis’ are complementary, not competing, thereby avoiding many fruitless scientific debates. However, the relationshi…
Biology (25 obras) · Primate Behavior and Ecology (25 obras) · Zoology (19 obras) · Ecology (16 obras) · Animal Vocal Communication and Behavior (15 obras) · Animal Behavior and Reproduction (14 obras) · Population (13 obras) · Animal ecology (12 obras) · Demography (12 obras) · Primate (11 obras)