DOI: 10.1016/j.palaeo.2015.07.034
论文题名: Inland California during the Pleistocene-Megafaunal stable isotope records reveal new paleoecological and paleoenvironmental insights
作者: Trayler R.B. ; Dundas R.G. ; Fox-Dobbs K. ; Van De Water P.K.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 437 起始页码: 132
结束页码: 140
语种: 英语
英文关键词: California
; Fairmead Landfill
; Irvingtonian
; McKittrick
; Pleistocene
; Rancholabrean
; Stable isotopes
英文摘要: We measured oxygen and carbon isotope compositions from teeth from three fossil localities in California, The McKittrick Tar seeps (Rancholabrean), Fairmead Landfill, and Irvington (both Irvingtonian). These sites have produced a variety of megafauna fossils, and to date are relatively understudied. Previous ecological studies of Pleistocene California megafauna have focused on the coastal Rancho La Brea tar seeps (RLB), neglecting inland faunas. Both Fairmead Landfill and McKittrick are located in California's San Joaquin Valley, and provide the first isotopic data from the region. We sampled a wide range of taxa; Equus, Camelops, Mammuthus, Mammut, Hemiauchenia, Odocoileus, Tetrameryx, Capromeryx, Platygonus, Canis dirus, Canis latrans, Arctodus simus, Smilodon, Homotherium, Miracinonyx, Panthera onca and Panthera atrox. Stable carbon values from both middle Pleistocene localities are consistent with a C3 dominated environment. Mean annual precipitation (MAP) estimates for the middle Pleistocene localities are ~340mm/year for Fairmead Landfill and ~900mm/year for Irvington. While the inland MAP estimate is similar to modern levels, Irvington MAP estimates are significantly higher than the modern average. In contrast, the McKittrick tar seeps show clear evidence of C4 consumption among Equus, Bison and Camelops, suggesting a mixture C4 grasses and halophytes. Similarly, comparing between McKittrick and published data for RLB indicate a higher level of C4 resources inland. Serially sampled teeth from both inland localities reveal diet and resource partitioning between browsers and grazers. © 2015 Elsevier B.V.. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68828
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth and Environmental Sciences, California State University, Fresno, CA, United States; Department of Geosciences, Boise State University, Boise, ID, United States; Department of Geology, University of Puget Sound, Tacoma, WA, United States
Recommended Citation:
Trayler R.B.,Dundas R.G.,Fox-Dobbs K.,et al. Inland California during the Pleistocene-Megafaunal stable isotope records reveal new paleoecological and paleoenvironmental insights[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,437