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1222125 修士論文(生命科学研究系先端生命科学専攻) >

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タイトル: 乳幼児・子供骨置換速度の評価と安定同位体分析による古人骨集団の授乳習慣の復元
著者: 蔦谷, 匠
著者(別言語): ツタヤ, タクミ
発行日: 2010年3月24日
抄録: It is important to reconstruct the breastfeeding and weaning practices in prehistoric populations, because it can produce valuable insights into the evolution of human life history and the past population dynamics. From the biological point of view, humans tend to wean their children earlier than most other apes do, and this is supposed to be a cultural adaptation. Stable isotope analysis of bone collagen has been used to reconstruct such breastfeeding and weaning practices of archaeological populations because it can reconstruct dietary habits of past population. However, stable isotope signatures of bone collagen were relative indicators of weaning ages, as previous studies have not been able to discuss breastfeeding and weaning practices quantitatively. In the first chapter, in order to estimate the absolute ages of onset and completion of weaning, I propose a novel model which consider the turnover of infants and children bones, based on previously reported data on fallout 90Sr in human bones and dairy product in U.S.A.. Then, this was applied to the infants and children skeletons from the Yuigahama-minami site in Kamakura, the medieval (1200 AD - 1600 AD) capital of Japan. As a result, the estimated ages of onset and completion of weaning were 1.5 and 2.5 years old respectively. It is important to estimate the absolute ages of weaning when we consider the evolution of human life history and the past population dynamics. In the second chapter, I attempted to reconstruct the breastfeeding and weaning practices of the Epi-Jomon hunter-gatherer population (the Usu-moshiri site: 3rd - 7th centuries) by using stable isotope analysis, and discuss the relationships between that practices and the diet of the population. Then, I applied the model which we developed in the first chapter and estimated the absolute ages of weaning. Isotopic studies which attempted to reconstruct the breastfeeding and weaning practices in prehistoric hunter-gatherer-fishers are rare. Here, I show there are two types of breastfeeding and weaning practices in Usu-moshiri population who inhibited Hokkaido in the Epi-Jomon period. In one practice, some infants were weaned rapidly around the age of 3. And in the other practice, infants consumed 13C and 15N depleted foods soon just after their birth. It was indicated that the infants and children in latter practice consumed terrestrial foods (e.g. C3 plants and terrestrial animals) to some extent, while the all adults in Usu-moshiri population highly depended on marine mammals as their protein sources. On the contrary to previous views, these results suggest that the prehistoric hunter-gatherer-fishers were able to use various food resources as weaning food and their breastfeeding and weaning practices could vary with the surrounding environment.
内容記述: 報告番号: ; 学位授与年月日: 2010-03-24 ; 学位の種別: 修士 ; 学位の種類: 修士(生命科学) ; 学位記番号: 修創域第3311号 ; 研究科・専攻: 新領域創成科学研究科生命科学研究系先端生命科学専攻
URI: http://hdl.handle.net/2261/53604
出現カテゴリ:025 修士論文
1222125 修士論文(生命科学研究系先端生命科学専攻)

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