| 研究課題/領域番号 |
20F20325
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| 研究機関 | 東京大学 |
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研究代表者 |
久保 麦野 東京大学, 大学院新領域創成科学研究科, 講師 (10582760)
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| 研究分担者 |
WINKLER DANIELA 東京大学, 新領域創成科学研究科, 外国人特別研究員
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| 研究期間 (年度) |
2020-11-13 – 2023-03-31
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| キーワード | Tooth wear / diet reconstruction / microwear / dietary ecology / tribology |
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| 研究実績の概要 |
We have conducted dental microwear analysis (DMTA) in theropod dinosaurs for the first time. Dietary ecology and feeding behavior are found to be more comparable to extant crocodiles than to smaller reptiles (lepidosaurs). Additional specimens from Triassic Herrerasaurus and Cretaceous juvenile Tarbosaurus have been obtained to complete the dataset, that now covers large theropods from Late Triassic until Late Cretaceous ecosystems and allows for testing of ontogenetic niche shift. Juvenile theropods are distinctly different in dental wear from adults, and their wear signature is interpreted as showing more signs of scavenging behavior. The results are currently submitted to an international journal for peer-review. The dataset of guinea pigs fed with different natural diets has been re-scanned on the host’s surface scanning system, and the results of the inter-microscope comparison is currently being written as a research paper.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
1: 当初の計画以上に進展している
理由
Data collection and analysis for the first application of dental microwear texture analysis to theropod dinosaurs, and for the inter-microscope comparison based on a dataset of 36 guinea pigs have already been completed within the first fiscal year of the project.
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| 今後の研究の推進方策 |
Due to the ongoing pandemic, travel restriction will likely be in effect during the fiscal year 2021. Thus, a refocus of project schedule is accounted for in the planning for the current fiscal year. We will not pursue further data collection from dinosaur specimens curated at international museums, as travel is unlikely at the moment. Instead, in cooperation with Universities and research facilities in Europe, dental molds of sauropod specimens will be investigated for niche partitioning and feeding preferences between species. Furthermore, we will pursue further projects beyond the original scope of the proposal, starting with investigating dental anomalies in local sika deer populations from Chiba prefecture.
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