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New evidence for leaf swallowing and Oesophagostomum infection in bonobos (Pan paniscus) Koninklijke Maatschappij voor Dierkunde van Antwerpen
We collected data on parasitic prevalence and leaf-swallowing behavior of bonobos (Pan paniscus) between August 1998 and April 1999 at the Iyema research site, Lomako Forest, Democratic Republic of Congo. We report the first detailed observations of leaf-swallowing among bonobos and the first record of the behavior at Iyema-Lomako. Bonobo leaf-swallowing closely fits the description of the behavior among chimpanzees. Bonobos ingested leaves of ...
Current status of the bonobo (Pan paniscus) in the proposed Lomako Reserve (Democratic Republic of Congo) Koninklijke Maatschappij voor Dierkunde van Antwerpen
The creation of a 3800 km(2) forest reserve along the Lomako river (Equateur Province, Democratic Republic of Congo) is considered one of the main actions necessary for the conservation of the bonobo (Pan paniscus). We conducted a one-month qualitative survey in parts of the Lomako forest, in order to determine the presence of bonobos and the nature and degree of human disturbance. Results are based on information obtained by questionnaires at ...
Is Bigger Really Better? Case Study - Behavioural Follow-Up of a Group of Bonobos (Pan paniscus) That Moves into a Bigger Enclosure Koninklijke Maatschappij voor Dierkunde van Antwerpen
Male dominance rank, mating and reproductive success in captive bonobos (Pan paniscus) Koninklijke Maatschappij voor Dierkunde van Antwerpen
Function and distribution of coalitions in captive bonobos (Pan paniscus) Koninklijke Maatschappij voor Dierkunde van Antwerpen
We examined the distribution of support behaviour within a captive group of bonobos. Most support was evoked by inter-sexual conflicts with the two highest ranking females. Within a dyad, the usual winner was most often supported. Individuals that challenged the rank order by aggressions and pestering were aggressed more often by their targets in the company of an ally. The two lowest ranking males served as scapegoats, receiving 80% of the ...
Dominance and its behavioral measures in a captive group of bonobos (Pan paniscus) Koninklijke Maatschappij voor Dierkunde van Antwerpen
We investigated the existence of a social dominance hierarchy in the captive group of six adult bonobos at the Planckendael Zoo. We quantified the pattern of dyadic exchange of a number of behaviors to examine to what extent each behavior fits a linear rank order model. Following de Waal (1989), we distinguish three types of dominance: agonistic dominance, competitive ability and formal dominance. Fleeing upon aggression is a good measure of ...
Sexual competition in a group of captive bonobos (Pan paniscus) Koninklijke Maatschappij voor Dierkunde van Antwerpen
We describe the occurrence of sexual competition, expressed as harassment of sexual interactions in a captive group of bonobos. We monitored all aggressive and pestering interventions during sexual interactions of three captive adult females, one adolescent, and three adult males. The study period covered two complete menstrual cycles for each female, with continuous daily observations. There was relatively little overt sexual competition by the ...
Comparing maternal styles in bonobos (Pan paniscus) and chimpanzees (Pan troglodytes) Koninklijke Maatschappij voor Dierkunde van Antwerpen
Studies on Cereopithecine primate maternal styles, using factor analysis on a set of maternal behaviors, commonly render two factors that describe separate dimensions of maternal behavior: protectiveness and rejection. The aims of this study were to 1) investigate whether this method for determining maternal styles in Cercopithecine species can be applied to bonobos (Pan paniscus) and chimpanzees (Pan troglodytes), 2) determine whether they ...
Locomotion in bonobos (Pan paniscus): differences and similarities between bipedal and quadrupedal terrestrial walking, and a comparison with other locomotor modes Koninklijke Maatschappij voor Dierkunde van Antwerpen
One of the great ongoing debates in palaeo-anthropology is when, and how, hominids acquired habitual bipedal locomotion. The newly adopted bipedal gait and the ancestral quadrupedal gait are most often considered as very distinct, with each habitual locomotor mode showing corresponding anatomical adaptations. Bonobos (Pan paniscus), along with common chimpanzees (P. troglodytes), are the closest living relatives to humans and their locomotion is ...