气候变化领域集成服务门户(CCPortal): The extinction of the Pleistocene megafauna in the Pampa of southern Brazil

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DOI	10.1016/j.quascirev.2020.106428
	The extinction of the Pleistocene megafauna in the Pampa of southern Brazil
	Lopes R.P.; Pereira J.C.; Kerber L.; Dillenburg S.R.
发表日期	2020
ISSN	0277-3791
卷号	242
英文摘要	The Late Pleistocene-early Holocene faunal turnover in South America was characterized by the extinction of all mammals with body mass >300 kg and several smaller taxa, but the driving mechanisms behind it are still poorly understood. Here is presented an analysis of the extinction in the Pampa of southern Brazil (Rio Grande do Sul state), based on fossil assemblages found in the coastal plain (CPRS) and western area of the state (WRS). The comparison between fossil and extant mastofaunas show that 90% of the mammals represented in fossil assemblages went extinct, and allowed distinguishing three groups: 1) taxa that underwent local extinction, i.e., disappeared locally but survived in other regions until becoming extinct later (including all megamammals); 2) pseudoextinct taxa that disappeared locally but survive until today in other areas, and 3) taxa that disappeared locally but returned during the Holocene. The faunal changes recorded along stratigraphic successions and available numerical ages indicate two phases of extinction, the first around 30 ka b2k in the CPRS (apparently also recorded in Argentina and Uruguay) would have been related to the onset of the cold and dry conditions of the stadial MIS 2, predating the arrival of humans to the region by about 25 kyrs. The second phase eliminated taxa that survived until about 12.7 ka BP in WRS in reduced suitable environments (‘refugia’) associated with perennial rivers; it coincides with the transition from glacial to interglacial conditions, but pollen data suggest that humans may have contributed for environmental modifications through fire. The results show that the Pleistocene xenarthran-dominated mastofauna was replaced by a Holocene fauna dominated by small rodents and carnivores, and indicate that climate-driven environmental changes, also influenced by sea-level oscillations, were a major agent in the Late Pleistocene mammalian extinctions in the Brazilian Pampa. © 2020 Elsevier Ltd
英文关键词	Climate change; Coastal plain; Extinction; Megafauna; MIS 2; MIS 3; Pampa; Pleistocene
语种	英语
scopus关键词	Sea level; Stratigraphy; Driving mechanism; Environmental change; Faunal turnover; Late Pleistocene; Local extinction; Rio Grande do Sul; Sea-level oscillations; Southern Brazil; Mammals; body mass; carnivore; extinction; fossil assemblage; glacial-interglacial cycle; Holocene; local extinction; mammal; marine isotope stage; Pleistocene; rodent; sea level change; Argentina; Argentina; Brazil; Pampas; Rio Grande do Sul; Uruguay; Mammalia; Rodentia
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151391
作者单位	Universidade Federal do Rio Grande do Sul, Instituto de Geociências. Avenida, Bento Gonçalves, 9500, CEP, Agronomia, Porto Alegre, RS 91540-000, Brazil; Museu Coronel Tancredo Fernandes de Melo., Rua Barão do Rio Branco, 467, CEP, Santa Vitória, do Palmar, RS 96230-000, Brazil; Museu Paraense Emílio Goeldi-Coordenação de Ciências da Terra e Ecologia, Belém - PA / Universidade Federal de Santa Maria, Centro de Apoio à Pesquisa Paleontológica da Quarta Colônia (CAPPA), Rua Maximiliano Vizzotto, 598, CEP, São João do Polêsine, RS 97230-000, Brazil
推荐引用方式 GB/T 7714	Lopes R.P.,Pereira J.C.,Kerber L.,et al. The extinction of the Pleistocene megafauna in the Pampa of southern Brazil[J],2020,242.
APA	Lopes R.P.,Pereira J.C.,Kerber L.,&Dillenburg S.R..(2020).The extinction of the Pleistocene megafauna in the Pampa of southern Brazil.Quaternary Science Reviews,242.
MLA	Lopes R.P.,et al."The extinction of the Pleistocene megafauna in the Pampa of southern Brazil".Quaternary Science Reviews 242(2020).