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Late Pleistocene ecological, environmental and climatic reconstruction based on megafauna stable isotopes from northwestern Chilean Patagonia.

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Gonzalez-Guarda, Erwin and Domingo Martínez, Laura and Tornero, Carlos and Pino, Mario and Hernández Fernández, Manuel and Sevilla, Paloma and Villavicencio, Natalia A. and Agustí, Jordi (2017) Late Pleistocene ecological, environmental and climatic reconstruction based on megafauna stable isotopes from northwestern Chilean Patagonia. Quaternary science reviews, 170 . pp. 188-202. ISSN 0277-3791

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Abstract

Stable isotope analyses have been performed on the bioapatite (δ13C; d18O) and collagen (δ13C; δ15N) of four late Pleistocene South American megafaunal taxa (Notiomastodon platensis, Equus andium, cf. Hemiauchenia paradoxa and Xenarthra indet.) to evaluate paleoclimatic and paleoenvironmental conditions as well as paleoecological features of this time period. The analyzed megafauna was found at several locations in the northwestern Chilean Patagonia (38º-42ºS, 74º-71ºW). The bioapatite δ13C values indicated the presence of C3 vegetation ranging from forestal to woodland areas. The collagen d15N values pointed to temperate and humid ecosystems, and to the consumption of shrubs, trees, grasses and sedges. Mean annual temperatures estimated from bioapatite δ18OPO4 values show a similarity to modern temperatures and suggested that the megafauna under study may have lived during warm stages (interstadials) of the late Pleistocene. When comparing our results with those obtained from other South American regions, we find that the diet of this particular Chilean megafauna appears to have been more influenced by resource availability than by the potential dietary range of the taxa.


Item Type:Article
Uncontrolled Keywords:Stable isotopes, Megafauna, Pilauco, Northwestern Patagonia, South America, Late Pleistocene
Subjects:Sciences > Geology > Geochemistry
Sciences > Geology > Paleontology
ID Code:46713
Deposited On:11 Apr 2019 08:51
Last Modified:11 Apr 2019 09:22

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