BIOLOGIA SUBTERRÂNEA
URI permanente para esta coleçãohttps://bdc.icmbio.gov.br/handle/cecav/3
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Item GEOGRAPHICAL DISTRIBUTION OF EREMOTHERIUM (XENARTHRA, MEGATHERIIDAE) RECORDS IN MIDWEST BRAZIL(2020) André Oliveira, Marlon; de Lima da Costa, Vanessa; Lopes de França Ferreira, Stephany; Silva Mendes, Millena; Souza Kuhn, Caiubi Emanuel; Oliveira Paulo, Pedro; de Oliveira Porpino, Kleberson; A. Candeiro, Carlos RobertoThe aim of this article was to present the current fossil record and geographical distribution of Eremotherium in midwest Brazil. The methodology employed here included a bibliographic survey and mapping of specimens. On the last years, new information has been revealed on these ground sloths mainly due to new fossil discoveries in the western region of Goiás and Mato Grosso states. The temporal distribution shows that these records range from the Pliocene to Holocene. This taxon is an important representative of the Brazilian megafauna, and despite its wide Pan-American distribution during the Pliocene-Holocene, there are few known Eremotherium records from this large geographic region of Brazil.- Isotopic paleoecology (δ13C) from mammals from IUIU/BA and paleoenvironmental reconstruction (δ13C, δ18O) for the Brazilian intertropical region through the late Pleistocene(2020-08-15) Dantas, Mário André Trindade; Missagia, Rafaela Velloso; Dutra, Rodrigo Parisi; Raugust, Tiago; Silva, Leandro Antônio da; Delicio, Maria Paula; Renó, Rodolfo; Cherkinsky, AlexanderStable isotopes of carbon and oxygen of fossil specimens are widely used for paleoecological and paleoenvironmental inferences, and there has been an effort to better understand the isotopic paleoecology and chronology of herbivores that inhabited the Brazilian Intertropical Region during the late Quaternary. In the present work, new radiocarbon datings and carbon and oxygen isotopes data for Eremotherium laurillardi, Notiomastodon platensis, Tapirus terrestris, Tayassu pecari, and Mazama gouazoubira are presented, from specimens that lived on Iuiu county (Toca Fria and Jatobá caves), state of Bahia, in the Brazilian Intertropical Region. E. laurillardi was dated as of ∼32 ka BP, representing the oldest direct dating for this species in the Brazilian Intertropical Region, while N. platensis was dated as of ∼25 ka BP. Fossils of the extant species T. pecari, M. gouazoubira, and T. terrestris presented radiocarbon ages of ∼23 ka BP, ∼21 ka BP, and ∼15 ka BP, respectively, showing that some of these species lived in Iuiu during the Last Glacial Maximum. According to our analyses, T. terrestris was the only specialist (δ13C = −11.0‰; piC3 = 0.76; BA = 0.49), whereas the remaining taxa were generalists mixed-feeders (δ13C = −1.3 to −10.0‰; piC3 = 0.24 to 0.69; BA > 0.58). The paleoenvironment reconstruction in Iuiu and other localities in BIR, during ∼32 ka BP to ∼15 ka BP, allow us to suggest that the dry arboreal to open Savanna habitats (rich in grass and shrubs) were the most common environment.