期刊
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷 267, 期 3-4, 页码 196-207出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.palaeo.2008.06.017
关键词
Rodent; Community; Pliocene; Pleistocene; Keystone species; Paleomagnetism; Paleosol; Oxygen isotope; Microtus; Blancan; Irvingtonian
资金
- National Geographic Society [5963-07, 6547-99]
- National Science Foundation [EAR 0207582]
- MSU
A dense fossil rodent database and new paleomagnetic data from the Meade Basin of southwestern Kansas document the transition from a Pliocene community characterized by cricetids of southern aspect and archaic arvicolids with rooted molars to a Pleistocene community with cricetids of temperate aspect and arvicolids with ever-growing molars. This new information suggests a revised date for the Blancan-Irvingtonian North American Land Mammal Age boundary between 2.06 and 1.95 Ma, coincident with the extinction of the Sigmodon minor lineage and the immigration of Microturs. Carbon and oxygen isotope compositions of paleosol carbonates indicate the faunal changes occurred during the final expansion of C-4 grasses in the Great Plains to modern abundance and a strong cooling trend reflecting the end of the early Pliocene warm interval and onset of northern hemisphere glaciation. Although extinctions balance originations through the study period, pulses of enhanced extinction and origination occurring near the Pliocene-Pleistocene boundary strongly suggest environmental change as the likely forcing mechanism for rodent community compositional shifts. The Meade Basin rodent sequence provides the most complete history of any terrestrial vertebrate group in North America for this period of time. (C) 2008 Elsevier B.V. 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