DOI: 10.1016/j.palaeo.2012.10.004
论文题名: Diversity and climate change in the middle-late Wasatchian (early Eocene) Willwood Formation, central Bighorn Basin, Wyoming
作者: Chew A.E. ; Oheim K.B.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 369 起始页码: 67
结束页码: 78
语种: 英语
英文关键词: Climate change
; Diversity
; Eocene
; Evenness
; Rarefaction
; Wyoming
英文摘要: Densely distributed mammal samples from the Willwood Formation in the central part of Wyoming's Bighorn Basin span episodes of major climate change. Previous work has focused on dramatic, short-term (< 200. kyr) faunal response to the Paleocene-Eocene Thermal Maximum and two periods of rapid faunal turnover 1-2. Myr later (Biohorizons A and B) that were probably also related to climate change. This project compares long-term diversity trends (> 0.5. Myr) during a ~ 1 Myr period of relatively static cool temperatures and a subsequent ~ 1. Myr period of warming that begins with the Biohorizon B event and ends with the Early Eocene Climatic Optimum (EECO) in which the Earth reached the hottest temperatures of the Cenozoic. Geographic Information Systems is used to create spatially-constrained subsamples to limit and explore the effects of the species-area relationship on multiple aspects of diversity, including the alpha (average locality) and beta (locality differentiation) components of species richness and the evenness and relative dominance of species' abundance distributions. Results demonstrate previously unrecognized spatial bias in the upper levels of the section that complicate the interpretation of faunal response to the EECO. Evenness is strongly related to alpha richness, whereas beta richness and dominance vary independently. Evenness increases significantly and richness becomes significantly more variable during warming. Richness also increases, but the rise in alpha richness is not significant and the rise in beta richness is equivocal. The dominance of the fauna by two abundant lineages escalates consistently regardless of changes in temperature. Diversity is not obviously affected across the Biohorizon B event, indicating that further study is necessary. © 2012 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69900
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Anatomy, Western University of Health Sciecznces, 309 E. Second St., Pomona, CA 91766, United States; Suffolk County Department of Planning, 100 Veterans Memorial Highway, Hauppauge, NY 11788, United States
Recommended Citation:
Chew A.E.,Oheim K.B.. Diversity and climate change in the middle-late Wasatchian (early Eocene) Willwood Formation, central Bighorn Basin, Wyoming[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,369