中科院古脊椎動(dòng)物與古人類研究所法籍博士后Romain Amiot及其多國合作者近日在著名學(xué)術(shù)刊物《地質(zhì)學(xué)》（Geology）2010年第2期發(fā)表了題為Oxygen isotope evidence for semi-aquatic habits among spinosaurid theropods的論文,，通過氧同位素的分析揭示了屬于獸腳類恐龍的棘背龍類具有半水生的生活習(xí)性,。該研究將同一地層中的棘背龍、陸生動(dòng)物和半水生動(dòng)物化石進(jìn)行比較發(fā)現(xiàn),，棘背龍化石中氧的同位素含量與陸生動(dòng)物存在較大差異,，但與同時(shí)代的鱷魚,、烏龜相比就比較接近，這說明它們很大一部分時(shí)間在水中度過,。此外,，棘背龍的骨架結(jié)構(gòu)表明，它并不是完全的水生動(dòng)物,。因此研究人員認(rèn)為,，棘背龍是一種半水生動(dòng)物。這項(xiàng)工作對(duì)研究中生代恐龍生態(tài)和習(xí)性的分化具有重要的意義,。
Amiot從2007開始在古脊椎所與周忠和研究員合作進(jìn)行博士后研究,，重點(diǎn)是對(duì)中生代脊椎動(dòng)物的骨骼進(jìn)行氧、碳同位素的分析,，從而恢復(fù)生物的習(xí)性和古氣候,。他從事的同位素大量分析工作是在中科院地質(zhì)與地球物理研究所合作完成的。（生物谷Bioon.com）
生物谷推薦原始出處：
Geology December 2009 v. 37 no. 12 p. 1095-1098 doi: 10.1130/G30393A.1
Oxygen isotope precipitation anomaly in the North Atlantic region during the 8.2 ka event
David Domínguez-Villar1,2,*, Ian J. Fairchild1, Andy Baker1, Xianfeng Wang3, R. Lawrence Edwards3 and Hai Cheng3
1School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, B152TT Birmingham, UK
2Departamento de Geodinámica, Facultad de Ciencias Geológicas, Universidad Complutense, 28040 Madrid, Spain
3Department of Geology and Geophysics, University of Minnesota, Minneapolis, Minnesota 55455, USA
An annual laminated stalagmite from northern Spain recorded two outstanding oxygen isotope (δ18O) pulses during the 8.2 ka event. Most of the oxygen isotope record variability is related to the amount of rainfall, although other factors affect the signal. The lamina thickness record, which is also related to amount of rainfall, does not show any significant anomaly at the time of oxygen isotope spikes. Considering the factors affecting the isotope signal, the two prominent falls in δ18O during the event are interpreted to be caused by the release of large amounts of fresh waters into the North Atlantic. Thus, 18O-depleted ocean surface waters shifted the rainfall δ18O composition for Europe and Greenland. Our precise chronology provides the timing of the outbursts that caused the δ18O anomalies at 8350–8340 and 8221–8211 ± 34 yr B.P., most probably generated by the drainage of proglacial lakes Agassiz and Ojibway. Therefore, in the North Atlantic region δ18O records during the 8.2 ka event trace important hydrological modifications in the ocean, not just local climate. As a consequence, paleoclimate reconstructions from Europe and Greenland using the δ18O proxy that does not take this into account would be overestimating the magnitude of the anomalies during the 8.2 ka event.
