巨齿鲨的文献研究摘要 / Publication research summaries · 3 entries
中文内容为资料集译写。每条说明所依据的摘要或正文范围。 / Chinese text is prepared for this collection. Summary evidence is identified for each entry.
Nature全文 PDF灭绝巨型鲨鱼巨齿鲨的身体尺寸：二维重建
Body dimensions of the extinct giant shark Otodus megalodon: a 2D reconstruction
Scientific reports · 2020
依据索引收录的作者摘要概括。
Summary based on the indexed author abstract.
主要发现 Key findings
以五种现生鼠鲨类为类比建立巨齿鲨二维比例模型，估计16米个体头长约4.65米、背鳍高约1.62米、尾高约3.85米。
Using five living lamniform analogues, the study estimates a 16 m megalodon with a roughly 4.65 m head, 1.62 m dorsal-fin height and 3.85 m tail height.
结论 Conclusions
这些尺寸是基于现生类比的模型估计，并非由完整巨齿鲨骨架直接测得。
These dimensions are model-based extrapolations from living analogues, not direct measurements of a complete megalodon skeleton.
Science全文 PDF新生代巨齿鲨类占据极高营养级
Cenozoic megatooth sharks occupied extremely high trophic positions.
Science advances · 2022
摘要解读依据已查看的索引作者摘要；如已保存全文，可用于进一步阅读。
Summary based on the inspected indexed author abstract; archived full text, when available, is provided for further reading.
主要发现 Key findings
研究校准牙釉样质结合有机质中的氮同位素作为营养级指标，并应用于耳齿鲨属化石。巨齿鲨极高的同位素值指示其营养位置高于已知海洋比较对象；该谱系的最高营养位置似乎早于最大体型出现。
The study calibrated tooth-enameloid-bound nitrogen isotopes as a trophic proxy and applied them to fossil Otodus sharks. Very high megalodon values indicate a trophic position above known marine comparators, and the lineage's highest trophic position apparently preceded its maximum body size.
结论 Conclusions
巨齿鲨谱系经历显著食性转变并达到异常高的营养位置；同位素证据可补充单凭体型作出的推断，帮助重建灭绝动物食物网。
Megatooth sharks underwent major dietary shifts and reached exceptional trophic positions. The isotope results offer a way to reconstruct extinct food webs beyond estimates based only on body size.
PNAS全文 PDF灭绝巨齿鲨类的内温生理机制
Endothermic physiology of extinct megatooth sharks.
Proceedings of the National Academy of Sciences of the United States of America · 2023
摘要解读依据已查看的索引作者摘要；如已保存全文，可用于进一步阅读。
Summary based on the inspected indexed author abstract; archived full text, when available, is provided for further reading.
主要发现 Key findings
团簇同位素测温与磷酸盐氧同位素显示，巨齿鲨体温高于周围海水及共存鲨鱼，为此前生物物理模型提出的体温调节能力提供地球化学支持。
Clumped-isotope thermometry and phosphate oxygen isotopes indicate that megalodon maintained a warmer body temperature than surrounding water and coexisting sharks. The results provide geochemical support for thermoregulation previously inferred through biophysical modeling.
结论 Conclusions
内温性可能促进巨大体型，同时带来较高代谢成本。作者认为这些成本也可能增加灭绝脆弱性，但这一因果解释仍属于推断。
Endothermy may have supported gigantism but imposed high metabolic costs. The authors suggest these costs could also have increased extinction vulnerability; that causal explanation remains an interpretation.