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Am J Primatol ; 85(9): e23529, 2023 09.
Artículo en Inglés | MEDLINE | ID: mdl-37311620

RESUMEN

Biological market theory (BMT) predicts that the balance between supply and demand determines the economic value of a "commodity," which consequently determines the amount of "services" that an individual needs to provide to obtain the commodity. In infant handling among primates, the existing literature suggests that handlers need to groom a mother to obtain access to its infant, particularly when the value of the infant is high (e.g., when the number of infants is low). However, grooming by handlers may not be a prerequisite for the occurrence of infant handling, because handlers can handle an infant that is separated from its mother. Based on 3 years of behavioral observations of wild Japanese macaques (Macaca fuscata), we examined the process by which infant handling occurs and the role of grooming in infant handling. We found that infant handling occurred more frequently when the mother and infant were separated than when they were in contact. Grooming rarely occurred before infant handling. The subsequent occurrence of infant handling was not predicted by either the occurrence or duration of grooming toward mothers by non-mother individuals. Grooming by handlers was also more likely to occur when an infant was in contact with its mother and when an infant's mother was dominant to the handlers. Contrary to BMT, the number of infants in a group did not affect grooming by handlers. These results indicate that the handlers' decision to groom depended on the opportunistic availability of an infant and the social relationship between the infant's mother and themselves. We conclude that grooming was not always necessary for infant handling.


Asunto(s)
Macaca fuscata , Madres , Animales , Femenino , Humanos , Relaciones Interpersonales , Técnicas de Observación Conductual , Aseo Animal
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