globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2012.10.042
论文题名:
Late middle to late Pleistocene paleoecology and paleoenvironments in the coastal plain of Rio Grande do Sul State, Southern Brazil, from stable isotopes in fossils of Toxodon and Stegomastodon
作者: Lopes R.P.; Ribeiro A.M.; Dillenburg S.R.; Schultz C.L.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 369
起始页码: 385
结束页码: 394
语种: 英语
英文关键词: Gomphotheriidae ; Megafauna ; Paleoecology ; Pleistocene ; Stable isotopes ; Toxodontidae
英文摘要: Stable isotopes (δ13C, δ18O) in teeth of extinct mammals have been used as indicators of diets and climate conditions, which in turn are used for paleoenvironmental reconstructions. The first analysis of stable isotopes in Pleistocene mammals from Southern Brazil is reported here. The analyzed taxa were the notoungulate Toxodon and the proboscidean Stegomastodon from Late Middle to Late Pleistocene fossiliferous beds exposed along Chuí Creek, in the coastal plain of Rio Grande do Sul State. The δ13C isotopes indicate that Toxodon was a mixed-feeder that fed mostly on C4 plants, while Stegomastodon was a browser to mixed-feeder with preference for C3 plants, with less C4 plants in the diet compared to modern African elephants. Comparison with carbon isotopic values in fossils of these taxa from other Late Quaternary localities in South America shows an increased proportion of C3 plants in the diets of both Toxodon and Stegomastodon in higher latitudes. The values of δ18O in both taxa seem to reflect the isotopic composition of the ingested water rather than the isotopic content in the plants of which they fed on, and the observed variations are likely to mirror variations of the patterns of precipitation. Paleoclimatic inferences and possible causes for the (pseudo)extinction of these taxa in southern Brazil are also discussed. © 2012 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69892
Appears in Collections:过去全球变化的重建

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作者单位: Universidade Federal do Rio Grande (FURG), Instituto de Oceanografia, Av. Itália, km 08, CEP 96201-900, Rio Grande, RS, Brazil; Universidade Federal do Rio Grande do Sul (UFRGS), Programa de Pós-graduação em Geociências, Avenida Bento Gonçalves, 9500, Agronomia, CEP 91540-000, Porto Alegre, RS, Brazil; Fundação Zoobotânica do Rio Grande do Sul, Museu de Ciências Naturais, Seção de Paleontologia, Avenida Salvador França, 1427 Jardim Botânico, CEP 90690000, Porto Alegre, RS, Brazil

Recommended Citation:
Lopes R.P.,Ribeiro A.M.,Dillenburg S.R.,et al. Late middle to late Pleistocene paleoecology and paleoenvironments in the coastal plain of Rio Grande do Sul State, Southern Brazil, from stable isotopes in fossils of Toxodon and Stegomastodon[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,369
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