農業の前駆的形態を発見(Discovery of a precursor to agriculture)

2025-08-25 マックス・プランク研究所

マックス・プランク人口研究所は、1939~2000年生まれの世代を対象に6種類の予測手法で平均余命を分析し、上昇速度が20世紀前半に比べ大幅に鈍化していると報告しました。1900~1938年生まれでは世代ごとに約5.5か月延びていましたが、1939年以降は2.5~3.5か月に減少し、伸び率は約37~52%低下しました。主因は乳幼児死亡率の改善余地が尽きたことにあり、20世紀初頭は乳児死亡減少が寿命延長を牽引しましたが、現在は成人・高齢者での改善に依存せざるを得ず、その効果は限定的です。研究者は、仮に成人死亡率改善が予測の2倍進んでも、過去の寿命延長ペースには届かないと指摘し、今後は高齢期の健康改善が寿命の主要な課題となると結論づけています。

農業の前駆的形態を発見(Discovery of a precursor to agriculture)A modern specimen of wild barley with the individual grains naturally shattering off as they become ripe.
© Robert Spengler

<関連情報>

中央アジア山麓における9000年前の大麦消費 9,000-year-old barley consumption in the foothills of central Asia

Xinying Zhou, Robert N. Spengler, Bahediyoh Sayfullaev, +19 , and Xiaoqiang Li
Proceedings of the National Academy of Sciences  Published:August 25, 2025
DOI:https://doi.org/10.1073/pnas.2424093122

Significance

Here, we present archaeobotanical data for ancient barley grains in association with sickle blades and grinding stones from the cave of Toda in the foothills of southern Uzbekistan. This finding helps shed light on one of the greatest mysteries in central Asian archaeology—how did the Kelteminar people live? We complement our data with a suite of radiocarbon dates, a detailed palynological study, an analysis of wood charcoal remains, and a detailed analysis of all aspects of the archaeological remains. These data, collectively, paint the clearest picture thus far of the prehistory of this poorly studied corner of the ancient world.

Abstract

Scholars are increasingly favoring models for the origins of agriculture that involve a protracted process of increasing interdependence within a series of mutualistic relationships between humans and plants, as opposed to a rapid single event or innovation. Nonetheless, these scholars continue to debate over when people first started foraging for grass seeds, when they began to readily utilize sickles, how prominent the early selection pressures were, and when the first traits of domestication fully introgressed into the cultivated grass population. Here, we present complementary archaeobotanical and archaeological (stone tool) evidence for cereal foragers from Toda-1 Cave in the Surkhan Darya, dating to 9200 cal BP. We conclude that early Holocene foragers were processing grains along with nuts and fruits as far north as the rich river valleys of southern Uzbekistan. These data expand the known range that preagricultural cereal foragers covered in the early Holocene, adding to our understanding of the cultural processes that led to farming. Additionally, we present the earliest evidence for people interacting with the progenitors for pistachios and apples (or a close apple relative). The complex foraging behaviors that led to cultivation were being undertaken by people during the early Holocene across a wider area of Eurasia than previously thought.

1204農業及び蚕糸
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