Jeroen M G Stevens
Biographic Data
| ID | 3072769 |
|---|---|
| NAME | Jeroen M G Stevens |
| GIVEN NAMES | Jeroen M G |
| FAMILY NAME | Stevens |
| SIGNATURE | STEVENS J M G |
| AFFILIATIONS | University of Antwerp |
| ORCID | 0000-0001-6730-4824 |
| VERIFIED | Yes |
| TOTAL WORKS | 19 |
| TOTAL CITATIONS | 35 |
| AUTHOR COUNT | 19 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 2005 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 3 |
Global Data From Great Ape Zoo Populations Confirm a High Prevalence of Overweight Individuals
Great apes in zoos have a history of receiving diets resembling those of humans in industrialized societies, with ensuing obesity and comorbidities. We analyzed adult zoo body mass (BM) data of 1290 chimpanzees, 141 bonobos, 231 Bornean orangutans, 186 Sumatran orangutans, and 719 Western gorillas in comparison to BM of free‐ranging conspecifics. Females and males considered overweight or obese were 62% and 45% in chimpanzees, 14% and 3% in bonob…
Wild bonobos experience unusually low bone resorption during early lactation relative to humans and other mammals
In mammals, pregnancy and lactation are marked by maternal calcium stress and bone resorption, leading to reduced bone mineral density. In humans, these periods may partly explain the higher prevalence of osteoporosis in older women compared with men, but lactation patterns in modern humans may reflect cultural influences rather than natural conditions. The extent to which these findings apply to wild-living mammals remains unknown. We measured u…
Group-level signatures in bonobo sociality
Humans show remarkable differences in social behaviour between families, groups, communities and cultures, whereas such group-level within-species variation in socio-behavioural propensities is typically overlooked in other species. Studies on intraspecific variation in animal social structures are needed to inform an evolutionary account of human sociality. Here, we study multiple independent bonobo populations ( n = 6) in zoological settings to…
Behavioral and physiological response to inequity in bonobos ( Pan paniscus )
Inequity aversion (IA), the affective, cognitive, and behavioral response to inequitable outcomes, allows individuals to avoid exploitation and therefore stabilizes cooperation. The presence of IA varies across animal species, which has stimulated research to investigate factors that might explain this variation, and to investigate underlying affective responses. Among great apes, IA is most often studied in chimpanzees. Here, we investigate IA i…
Visually assessed body condition shows high heritability in a pedigreed great ape population
Body condition, a measure for relative fat mass, is associated with primate health, fitness, and overall welfare. Body condition is often influenced by dietary factors, age, and/or sex, but several body condition measures (body weight, weight‐to‐height ratios, and so on) also show high heritability across primate species, indicating a role of genetic effects. Although different measures for body condition exist, many require direct handling of an…
Self-interest precludes prosocial juice provisioning in a free choice group experiment in bonobos
Social and nonsocial stimuli alter the performance of bonobos during a pictorial emotional Stroop task
The emotional Stroop task is a paradigm commonly applied in human studies to investigate how emotionally laden stimuli interfere with cognitive processes. Recent modifications of this task have enabled researchers to study similar Stroop effects in zoo‐housed primates. Across three experiments using a pictorial emotional Stroop task, we investigated if the attention of bonobos was influenced by social (facial expressions during play, conflict, an…
Social and nonsocial stimuli alter the performance of bonobos during a pictorial emotional Stroop task
Blood testosterone levels in sickness and in health: Male chimpanzee testosterone levels decrease in face of an immune challenge
As an integral part of the immune response, testosterone secretion is inhibited when an individual is confronted with an immune challenge. Testosterone‐mediated physiological, morphological, and behavioral traits are compromised at times of impaired health. Nevertheless, males of some species seem to maintain high levels of testosterone when confronted with an immune challenge, upholding competitive strength but compromising their immune response…
The Pan social brain: An evolutionary history of neurochemical receptor genes and their potential impact on sociocognitive differences
Food preference and nutrient composition in captive bonobos (Pan paniscus)
Within arm's reach: Measuring forearm length to assess growth patterns in captive bonobos and chimpanzees
OBJECTIVES: Bonobos and chimpanzees are known to differ in various morphological traits, a dichotomy that is sometimes used as an analogy for evolutionary splits during human evolution. The aim of our study was to measure the forearm length of immature and adult bonobos and adult chimpanzees to assess the extent of age-related changes of forearm length in bonobos and sex-dimorphism in bonobos and chimpanzees. MATERIALS AND METHODS: As a proxy of …
Age-related changes in Thyroid hormone levels of bonobos and chimpanzees indicate heterochrony in development
Mechanisms of reciprocity in primates: Testing for short-term contingency of grooming and food sharing in bonobos and chimpanzees
Tolerant food sharing and reciprocity is precluded by despotism among bonobos but not chimpanzees
Tolerant food sharing among human foragers can largely be explained by reciprocity. In contrast, food sharing among chimpanzees and bonobos may not always reflect reciprocity, which could be explained by different dominance styles: in egalitarian societies reciprocity is expressed freely, while in more despotic groups dominants may hinder reciprocity. We tested the degree of reciprocity and the influence of dominance on food sharing among chimpan…
Sex Differences in the Steepness of Dominance Hierarchies in Captive Bonobo Groups
Social structures in Pan paniscus: Testing the female bonding hypothesis
Measuring and testing the steepness of dominance hierarchies
Peering is not a formal indicator of subordination in bonobos (Pan paniscus)
It has been suggested that peering behavior in bonobos is a formal signal acknowledging social dominance status. We investigated whether peering meets the published criteria for a formal signal of subordination in five captive groups of bonobos. The degree of linearity in the set of peering relationships was significantly high in all study groups, and a linear rank order was found. However, unidirectionality was low, and there was little correspo…
Tolerant food sharing and reciprocity is precluded by despotism among bonobos but not chimpanzees
Tolerant food sharing among human foragers can largely be explained by reciprocity. In contrast, food sharing among chimpanzees and bonobos may not always reflect reciprocity, which could be explained by different dominance styles: in egalitarian societies reciprocity is expressed freely, while in more despotic groups dominants may hinder reciprocity. We tested the degree of reciprocity and the influence of dominance on food sharing among chimpan…
Age-related changes in Thyroid hormone levels of bonobos and chimpanzees indicate heterochrony in development
Sex Differences in the Steepness of Dominance Hierarchies in Captive Bonobo Groups
Within arm's reach: Measuring forearm length to assess growth patterns in captive bonobos and chimpanzees
OBJECTIVES: Bonobos and chimpanzees are known to differ in various morphological traits, a dichotomy that is sometimes used as an analogy for evolutionary splits during human evolution. The aim of our study was to measure the forearm length of immature and adult bonobos and adult chimpanzees to assess the extent of age-related changes of forearm length in bonobos and sex-dimorphism in bonobos and chimpanzees. MATERIALS AND METHODS: As a proxy of …
Peering is not a formal indicator of subordination in bonobos (Pan paniscus)
It has been suggested that peering behavior in bonobos is a formal signal acknowledging social dominance status. We investigated whether peering meets the published criteria for a formal signal of subordination in five captive groups of bonobos. The degree of linearity in the set of peering relationships was significantly high in all study groups, and a linear rank order was found. However, unidirectionality was low, and there was little correspo…
Social structures in Pan paniscus: Testing the female bonding hypothesis
Measuring and testing the steepness of dominance hierarchies
Sex Differences in the Steepness of Dominance Hierarchies in Captive Bonobo Groups
Tolerant food sharing and reciprocity is precluded by despotism among bonobos but not chimpanzees
Tolerant food sharing among human foragers can largely be explained by reciprocity. In contrast, food sharing among chimpanzees and bonobos may not always reflect reciprocity, which could be explained by different dominance styles: in egalitarian societies reciprocity is expressed freely, while in more despotic groups dominants may hinder reciprocity. We tested the degree of reciprocity and the influence of dominance on food sharing among chimpan…
Mechanisms of reciprocity in primates: Testing for short-term contingency of grooming and food sharing in bonobos and chimpanzees
Age-related changes in Thyroid hormone levels of bonobos and chimpanzees indicate heterochrony in development
Within arm's reach: Measuring forearm length to assess growth patterns in captive bonobos and chimpanzees
OBJECTIVES: Bonobos and chimpanzees are known to differ in various morphological traits, a dichotomy that is sometimes used as an analogy for evolutionary splits during human evolution. The aim of our study was to measure the forearm length of immature and adult bonobos and adult chimpanzees to assess the extent of age-related changes of forearm length in bonobos and sex-dimorphism in bonobos and chimpanzees. MATERIALS AND METHODS: As a proxy of …
Food preference and nutrient composition in captive bonobos (Pan paniscus)
The Pan social brain: An evolutionary history of neurochemical receptor genes and their potential impact on sociocognitive differences
Self-interest precludes prosocial juice provisioning in a free choice group experiment in bonobos
Social and nonsocial stimuli alter the performance of bonobos during a pictorial emotional Stroop task
The emotional Stroop task is a paradigm commonly applied in human studies to investigate how emotionally laden stimuli interfere with cognitive processes. Recent modifications of this task have enabled researchers to study similar Stroop effects in zoo‐housed primates. Across three experiments using a pictorial emotional Stroop task, we investigated if the attention of bonobos was influenced by social (facial expressions during play, conflict, an…
Social and nonsocial stimuli alter the performance of bonobos during a pictorial emotional Stroop task
Blood testosterone levels in sickness and in health: Male chimpanzee testosterone levels decrease in face of an immune challenge
As an integral part of the immune response, testosterone secretion is inhibited when an individual is confronted with an immune challenge. Testosterone‐mediated physiological, morphological, and behavioral traits are compromised at times of impaired health. Nevertheless, males of some species seem to maintain high levels of testosterone when confronted with an immune challenge, upholding competitive strength but compromising their immune response…
Behavioral and physiological response to inequity in bonobos ( Pan paniscus )
Inequity aversion (IA), the affective, cognitive, and behavioral response to inequitable outcomes, allows individuals to avoid exploitation and therefore stabilizes cooperation. The presence of IA varies across animal species, which has stimulated research to investigate factors that might explain this variation, and to investigate underlying affective responses. Among great apes, IA is most often studied in chimpanzees. Here, we investigate IA i…
Visually assessed body condition shows high heritability in a pedigreed great ape population
Body condition, a measure for relative fat mass, is associated with primate health, fitness, and overall welfare. Body condition is often influenced by dietary factors, age, and/or sex, but several body condition measures (body weight, weight‐to‐height ratios, and so on) also show high heritability across primate species, indicating a role of genetic effects. Although different measures for body condition exist, many require direct handling of an…
Group-level signatures in bonobo sociality
Humans show remarkable differences in social behaviour between families, groups, communities and cultures, whereas such group-level within-species variation in socio-behavioural propensities is typically overlooked in other species. Studies on intraspecific variation in animal social structures are needed to inform an evolutionary account of human sociality. Here, we study multiple independent bonobo populations ( n = 6) in zoological settings to…
Wild bonobos experience unusually low bone resorption during early lactation relative to humans and other mammals
In mammals, pregnancy and lactation are marked by maternal calcium stress and bone resorption, leading to reduced bone mineral density. In humans, these periods may partly explain the higher prevalence of osteoporosis in older women compared with men, but lactation patterns in modern humans may reflect cultural influences rather than natural conditions. The extent to which these findings apply to wild-living mammals remains unknown. We measured u…
Global Data From Great Ape Zoo Populations Confirm a High Prevalence of Overweight Individuals
Great apes in zoos have a history of receiving diets resembling those of humans in industrialized societies, with ensuing obesity and comorbidities. We analyzed adult zoo body mass (BM) data of 1290 chimpanzees, 141 bonobos, 231 Bornean orangutans, 186 Sumatran orangutans, and 719 Western gorillas in comparison to BM of free‐ranging conspecifics. Females and males considered overweight or obese were 62% and 45% in chimpanzees, 14% and 3% in bonob…
Primate Behavior and Ecology (17 works) · Biology (15 works) · Psychology (11 works) · Zoology (10 works) · Animal Behavior and Reproduction (8 works) · Social Psychology (7 works) · Bonobo (6 works) · Captivity (6 works) · Developmental psychology (6 works) · Ecology (6 works)