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Development and morphological variation in Pongo pygmaeus

Research Project

Project/Area Number 10041106
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionField Research
Research Field 人類学(含生理人類学)
Research InstitutionChiba University

Principal Investigator

UCHIDA Akiko  Chiba University Faculty of Letters, Associate Professor, 文学部, 助教授 (50283685)

Project Period (FY) 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
KeywordsPongo pygmaeus / Morphology / Development / Secondary sexual characteristics / 二次性徴
Research Abstract

This research focused on the developmental patterns of crania, dentition, and postcrania among wild Pongo pygameus. Skeletal parts investigated in this study were as follows : tooth eruption and wear progress, cranial sutures, proximal and distal joints of long bones, clavicle, pelvis. As size variables, size of dentition, cranial, and long bones were also measured. Analysis of developmental stages of teeth and several skeletal joints revealed the several distinct aspects of orangutan development. Those are listed below.
1. Development, maturing and aging of teeth, crania, postcrania occur more or less independently, especially in males. Therefore, the definition of adult should be done carefully. 2. Basal cranial suture (spheno-occipital synchondorosis) closes only after the completion of eruption of permanent dentition, and sometimes, molars show heavy wear by then. 3. The last postcranial parts to finish development are distal ends of forelimbs. The line of distal end of ulna and radius happens after the closure of basal cranial suture. Development, maturing and aging of crania and postcranial are supposed to be controlled by endocrinological factors which are in turn related probably with social behavior. In order to have better understanding of these interactions, it is necessary to carry out longitudinal study on captive orangutans in which morphological, endocrinological and behavioral variables should be studied at the same time. In addition, in order to approach the evolutionary, and adaptive significance of such developmental patterns of orangutans, a study of wild orangutans in which association between morphology and reproductive success is necessary.

Report

(2 results)
  • 1998 Annual Research Report   Final Research Report Summary

URL: 

Published: 1998-04-01   Modified: 2016-04-21  

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