Document Detail


Age-dependent patterns of intensive observation on elders by free-ranging juvenile Japanese macaques (Macaca fuscata yakui) within foraging context on Yakushima.
MedLine Citation:
PMID:  18680177     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Early learning about edible food in the environment is a critical survival task for young nonhuman primates. Social learning and social facilitation are often cited to explain how youngsters learn to select and find their food. In this framework, we observed eight mother-youngster pairs of free-ranging Japanese macaques divided into two sets according to the age of the young (infants aged between 7 and 12 months and juveniles aged between 1.5 and 2 years) during three winter months. We systematically investigated the intensive observation directed by the youngsters toward elders by recording the target's identity (e.g. mother, subadult), the items manipulated by the elder and those items closely observed by the youngster, along with the behavior of the youngster preceding and immediately following an intensive observation period. The diet of the mothers and juveniles was estimated from time records of each feeding occurrence for each food item (identified to species level) and from the quantity of fresh matter ingested. The results show that intensive observation by both infants and juveniles were directed toward those elders engaged in plant and invertebrate foraging. Such behavior was age-dependent, being more frequent in infants than in juveniles. The majority of the intensive observations were directed toward the mother. Intensive observations also shaped a change in the behavior of infants by significantly stimulating the investigation of food items and locations otherwise not investigated by juveniles. Moreover, infants showed a particular interest in rare food items and especially invertebrates. Age differences between the two sets of young and their interest in rare foods are discussed with reference to the occurrence of intensive observation within the framework of kin relationships, social organization, and social transmission of information about food type and food location and its survival values.
Authors:
Laurent Tarnaud; Juichui Yamagiwa
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of primatology     Volume:  70     ISSN:  1098-2345     ISO Abbreviation:  Am. J. Primatol.     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-11-03     Completed Date:  2009-01-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8108949     Medline TA:  Am J Primatol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1103-13     Citation Subset:  IM    
Affiliation:
Laboratory of Human Evolution Sciences, Graduate School of Science, Kyoto University, Sakyo-ku, Japan. Laurent.tarnaud@free.fr
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Animals
Attention*
Exploratory Behavior / physiology*
Feeding Behavior / physiology
Japan
Learning / physiology*
Macaca / physiology*
Social Facilitation*
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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