SGER: Phusiological Factors Controlling the &18 O Values of Body Water for Coexisting Endotherms and Ectotherms

我们建议测量生活在同一栖息地的现代恒温动物（温血动物）和变温动物（冷血动物）骨骼的氧同位素组成，以观察它们不同的代谢是否可以同位素区分。将确定来自同一地点的共存鸟类、哺乳动物和爬行动物骨骼的氧同位素值（样本可从新墨西哥大学生物博物馆获得）。同位素差异将使用已知的生理因素进行建模。我们的最终目标是利用已灭绝物种（如恐龙）的氧同位素组成来限制它们的生理机能。现代的类似物——鸟类、哺乳动物和爬行动物——将成为我们评估化石物种的基础。

9904284SharpWe propose to measure the oxygen isotope composition of bones from modern endothermic (warm-blooded) and ectothermic (cold-blooded) species that occupy the same habitats in order to see if their different metabolisms can be distinguished isotopically. The oxygen isotope values of coexisting bird, mammal and reptile bones coming from the same locality will be determined (samples are available from the University of New Mexico Biology Museum). Isotopic differences will be modeled using known physiological factors. Our ultimate goal is to use the oxygen isotope composition of extinct species (e.g., dinosaurs) to constrain their physiology. The modern analogues -- birds, mammals and reptiles --- will form the basis for our assessment of fossil species.