期刊
QUATERNARY INTERNATIONAL
卷 212, 期 2, 页码 198-205出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quaint.2009.09.004
关键词
-
资金
- NSF [EAR 0720387]
Quaternary small-mammal fossils are widespread and have served as valuable paleoclimatic proxies through niche-modeling or otherwise relating presence-absence data to climatic data. This paper examines the potential for a new, more resolved type of paleoclimate proxy in the form of Microtus tooth shape, using an abundant California species, Microtus californicus. Geometric morphometrics and partial least squares analyses are used to find geographic signals in the shape of the first lower molar (m1) of this species. M. californicus m1s are relatively straight in the northwest, cooler, moister portion of California and more curved in the southeast, hotter, drier portion of the state. These tooth shape changes may be a result of selection related to different vegetation ultimately controlled by climate, and therefore diet, within the species' range. The pattern in m1 shape persists when phylogeographic hypotheses are taken into account, indicating that the climate signal is significant independent of intraspecific groupings. This method adds an important new tool to the suite of proxies available to reconstruct past climates at fine spatiotemporal scales and reveals a geographic/climatic signal that correlates with morphological variation across the range of M. californicus. (C) 2009 Elsevier Ltd and INQUA. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据