1990 Fiscal Year Final Research Report Summary
Behavioral Ecology of Paternity in Japanese Macaques Based on Biochemical Analysis of their Paternity
| Project/Area Number |
01480006
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
生態学
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| Research Institution | Kyoto University |
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Principal Investigator |
SUGIYAMA Yukimaru Kyoto Univ., Primate Res. Inst., Professor, 霊長類研究所, 教授 (20025349)
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| Co-Investigator(Kenkyū-buntansha) |
SHOTAKE Takayoshi Kyoto Univ., Primate Res. Inst., Associate Professor, 霊長類研究所, 助教授 (00003103)
NOZAKI Masumi Kyoto Univ., Primate Res. Inst., Instructor, 霊長類研究所, 助手 (70136232)
OHSAWA Hideyuki Kyoto Univ., Primate Res. Inst., Associate Professor, 霊長類研究所, 助教授 (60027498)
TAKENAKA Osamu Kyoto Univ., Primate Res. Inst., Professor, 霊長類研究所, 教授 (00093261)
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| Project Period (FY) |
1989 – 1990
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| Keywords | DNA fingerprinting / Paternity discrimination / Promiscuous mating / Japanese macaques / Mini-satellite DNA / Reproductive strategy / Mating strategy / Social rank |
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| Research Abstract |
Paternity in Japanese macaque (Macaca fuscata) groups has been behaviorally indiscernible because of their multimale group structure and promiscuous mating patterns. Electrophoretic analysis of blood proteins and immunoserological analysis also failed to discriminate paternity because there is little detectable polymorphism. Recently developed DNA fingerprinting techniques employing "minisatellite" hypervariable regions of DNA proved useful for investigating male reproductive success in this macaque. Their mating behavior and the identified paternity in a captive group indicated 1) in the males over than 4 years old, it revealed the possibility of a correlation between male dominance rank and number of offspring, however, social rank do not reflect the number of offsprings among the major three adult males. 2) Inbreeding was avoided within the same maternal lineage, 3) females did not tend to give birth to offspring fathered by the same males during their life, 4) male dominance rank was positively correlated with the number of copulation accompanied by ejaculation, 5) the number of copulations with ejaculation was not correlated with the number of offspring. Although low-ranking males had only limited opportunities for copulation, they were able to inseminate females. 6) The selection of copulation partners by males can be divided into three patterns according to their age and social rank. 7) Paternity inferred from observation of sexual behavior did not consistently match paternity identified by DNA fingerprinting, especially in cases involving primiparous females.
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