2026-06-27T23:16:20Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/60502024-07-30T16:59:17Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Domingo Martínez, Laura author Tomassini, Rodrigo L. author Montalvo, Claudia I. author Sanz Pérez, Danae author Alberdi, María Teresa 2023-06-16T15:15:56Z 2023-06-16T15:15:56Z 2020 2045-2322 10.1038/s41598-020-58575-6 https://hdl.handle.net/20.500.14352/6050 https://www.nature.com/articles/s41598-020-58575-6 This study aims at assessing resource and habitat use, niche occupation and trophic interactions from a stable isotope perspective on fossil mammals from the Argentine Pampas during the Great American Biotic Interchange (GABI). We present stable isotope data of more than 400 samples belonging to 10 mammalian orders and spanning a temporal range from ~9.5 Ma to ~12 ky. Rodents, notoungulates and pilosians record an increase in the consumption of C4 plants, whereas litopterns and cingulates show δ13C values that remain mostly within a C3-dominated diet. Our stable isotope data indicates that the expansion of C4 vegetation opened up new niche opportunities, probably alleviating resource competition among endemic taxa. Gomphothere, equid and camelid δ13C records show a broad variability pointing to consumption of C3 and mixed C3-C4 vegetation. This flexible dietary behavior may have facilitated the successful settlement of immigrant groups in South America. In the case of carnivorous taxa, Late Miocene pre-GABI endemic sparassodonts consumed prey from C3 environments, whereas immigrant carnivorans preferred prey from mixed C3-C4 areas. Our research contributes to the study of the GABI from a different perspective as stable isotope records permit to characterize, from a (semi)quantitative standpoint, ecological traits within extinct fauna. eng Atribución 3.0 España The Great American Biotic Interchange revisited: a new perspective from the stable isotope record of Argentine Pampas fossil mammals journal article URL https://docta.ucm.es/bitstreams/84684af2-12ca-4dcf-9759-8dc7ee905869/download File MD5 8113ba9c4fa6e35df939d2e8e6ffd10e 2745192 application/pdf The Great American Biotic Interchange revisited a new perspective from the.pdf URL https://docta.ucm.es/bitstreams/09429635-3f2a-4b89-8a35-0974a55e331e/download File MD5 b96e710d95c846e63a33cebde6b1d143 58091 text/plain The Great American Biotic Interchange revisited a new perspective from the.pdf.txt