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

9904284夏普我们建议测量骨骼的氧同位素组成，从现代吸热（温血）和变温（冷血）物种，占据相同的栖息地，以看看他们的不同代谢可以区分同位素。 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（样本可从新墨西哥州大学生物博物馆获得）。 将使用已知的生理因素对同位素差异进行建模。 我们的最终目标是利用灭绝物种的氧同位素组成（例如，恐龙）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.