Dietary responses of Sahul (Pleistocene Australia–New Guinea)megafauna to climate and environmental change
DeSantis, L.R.G(DeSantis, Larisa R.G)1; Field,J.H(Field,Judith H)2; Wore, S(Wore,Stephen)2,3; Dodson, J.R(Dodson, John R)2,4; DeSantis, Larisa R.G
2017-01-26
发表期刊The Paleontological Society
卷号43期号:2页码:181-195
文章类型期刊论文
其他摘要Throughout the late Quaternary, the Sahul (Pleistocene Australia–New Guinea) vertebrate fauna was dominated by a diversity of large mammals, birds, and reptiles, commonly referred to as megafauna. Since ca. 450–400Ka, approximately 88 species disappeared in Sahul, including kangaroos exceeding 200kg in size, wombat-like animals the size of hippopotamuses, flightless birds, and giant monitor lizards that were likely venomous. Ongoing debates over the primary cause of these extinctions have typically favored climate change or human activities. Improving our understanding of the population biology of extinct megafauna as more refined paleoenvironmental data sets become available will assist in identifying their potential vulnerabilities. Here, we apply a multiproxy approach to analyze fossil teeth from deposits dated to the middle and late Pleistocene at Cuddie Springs in southeastern Australia, assessing relative aridity via oxygen isotopes as well as vegetation and megafaunal diets using both carbon isotopes and dental microwear texture analyses. We report that the Cuddie Springs middle Pleistocene fauna was largely dominated by browsers, including consumers of C4 shrubs, but that by late Pleistocene times the C4 dietary component was markedly reduced. Our results suggest dietary restriction in more arid conditions. These dietary shifts are consistent with other independently derived isotopic data from eggshells and wombat teeth that also suggest a reduction in C4 vegetation after ~45 Ka in southeastern Australia, coincident with increasing aridification through the middle to late Pleistocene. Understanding the ecology of extinct species is important in clarifying the primary drivers of faunal extinction in Sahul. The results presented here highlight the potential impacts of aridification on marsupial megafauna. The trend to increasingly arid conditions through the middle to late Pleistocene (as identified in other paleoenvironmental records and now also observed, in part, in the Cuddie Springs sequence) may have stressed the most vulnerable animals, perhaps accelerating the decline of late Pleistocene megafauna in Australia.
DOI10.1017/pab.2016.50
收录类别SCI
所属项目编号EAR1053839 ; FAIN1455198 ; ARC LP211430 ; DP05579230
语种英语
项目资助者NationalScience Foundation ; NationalScience Foundation ; the Australian Research Council ; the Australian Research Council ; the University of New South Wales ; the University of New South Wales ; the University ofSydney ; the University ofSydney ; Oak Ridge Associated UniversitiesRalph E. Powe Junior Faculty EnhancementAward ; Oak Ridge Associated UniversitiesRalph E. Powe Junior Faculty EnhancementAward ; Vanderbilt University ; Vanderbilt University
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文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/5588
专题黄土与第四纪地质国家重点实验室(2010~)
通讯作者DeSantis, Larisa R.G
作者单位1.DeSantis. Department of Earth and Environmental Sciences, Vanderbilt University, Nashville,TN 37235-1805, U.S.A
2.School of Biological, Earth and Environmental Sciences, University of New South Wales,Sydney, NSW 2052, Australia
3.Department of Zoology, School of Environmental and Rural Sciences,University of New England, Armidale, NSW 2351, Australia
4.Institute of Earth Environment, Chinese Academy of Sciences, Xi’an,Shaanxi, 710061, China
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DeSantis, L.R.G(DeSantis, Larisa R.G),Field,J.H(Field,Judith H),Wore, S(Wore,Stephen),等. Dietary responses of Sahul (Pleistocene Australia–New Guinea)megafauna to climate and environmental change[J]. The Paleontological Society,2017,43(2):181-195.
APA DeSantis, L.R.G,Field,J.H,Wore, S,Dodson, J.R,&DeSantis, Larisa R.G.(2017).Dietary responses of Sahul (Pleistocene Australia–New Guinea)megafauna to climate and environmental change.The Paleontological Society,43(2),181-195.
MLA DeSantis, L.R.G,et al."Dietary responses of Sahul (Pleistocene Australia–New Guinea)megafauna to climate and environmental change".The Paleontological Society 43.2(2017):181-195.
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