2001 Fiscal Year Final Research Report Summary
Reconstruction of human male mating strategies by interspecific comparisons of testicular histology among primates
| Project/Area Number |
11640712
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
人類学(含生理人類学)
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| Research Institution | Tokai University |
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Principal Investigator |
ENOMOTO Tomoo School of Medicine, Tokai University, Associate, 医学部, 助教授 (80056316)
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| Co-Investigator(Kenkyū-buntansha) |
FUJII-HANAMOTO Hideko School of Medicine, Tokai University, Assistant Researcher, 医学部, 助手 (50156824)
NAGATO Yasukazu School of Medicine, Tokai University, Associate Professor, 医学部, 助教授 (30056345)
MATSUBAYASHI Kiyoaki Kyoto University, Primate Research Institute, Professor, 霊長類研究所, 教授 (50027497)
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| Project Period (FY) |
1999 – 2001
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| Keywords | Spermatogenesis / Gorilla / Orangutan / Chimpanzee / Human / Spermatogenetic Index / Meiosis Index / Sperm production |
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| Research Abstract |
We attempted to verify sperm competition hypothesis in histological view of sperm competition in primates including human. Testicular samples of gorillas (N=11), chimpanzees (11), orangutans (6) and humans (6) were obtained by autopsies. The testicular preparations were stained with HE, PAS-hematoxylin and also immunohitochemical staining of testosterone. In gorillas, six specimens out of 11 did not show spermatogenetic cell architecture of seminiferous epithelia. Interstitial tissue were quite dense and plenty, and interstitial cells were abundant in it. In chimpanzees, seminiferous epithelia were extremely thick and many spermatogenic cells were observed. The interstitial tissue was quite loose with a few interstitial cells. In orangutans, spermatogenesis was rather active. The interstitial tissue was plenty. Acrosomic system was conspicuous. Spermatogenetic index (SI) and meiotic index (MI) were calculated for gorillas (N=11), chimpanzees (5), orangutans (4) and human (1) samples. Both mean SI and mean MI of gorillas was significantly lower than those of chimpanzees and orangutans. Sperm production rate of the gorilla was estimated to be 1/40 of the chimpanzee and 1/8 of the orangutan. The rate of the human was considered to be 6 times of the gorilla and 1/7 of the chimpanzee.
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