重建古生态系统

重建一个古代生态系统，需要利用多条独立的证据链：通过牙齿同位素分析推断饮食和迁徙，通过骨骼组织学（生长纹）估算年龄和生长速率，通过粪化石化学成分判断食性，通过古植物学重建栖息地——从而理解古生物学是一门综合证据的学科。

Reconstruct an ancient ecosystem using multiple independent lines of evidence: isotope analysis of teeth to infer diet and migration, bone histology (growth rings) to estimate age and growth rate, coprolite chemistry for diet, and palaeobotany for habitat — understanding that palaeontology is an evidence-synthesis discipline

学习证据 / Evidence

• 解释牙齿中的稳定氧同位素比值如何随地理位置变化，从而可以识别季节性迁徙。
• 解释骨骼横截面上的年生长纹如何揭示生长速率和大致死亡年龄。
• 描述如何将牙齿同位素、粪化石和化石植物组合的证据结合起来，比单靠任何一种证据更能呈现古生态的完整图景。

• Explains how stable oxygen isotope ratios in teeth shift with geographic location, allowing detection of seasonal migration
• Explains how annual growth rings in bone cross-sections reveal growth rate and approximate age at death
• Describes how combining evidence from teeth isotopes, coprolites, and fossil plant assemblages builds a richer picture of ancient ecology than any single source alone

评估问题 / Assessment

如果{{name}}被问到科学家是如何知道大型恐龙每年迁徙数百公里的，{{name}}能否解释科学家会寻找哪些证据，以及如何排除其他可能的解释？

If {{name}} was asked how scientists know a large dinosaur migrated hundreds of kilometres every year, could they explain what kind of evidence they look for and how they rule out alternative explanations?