A bone to pick: stable isotope compositions as tracers of food sources and paleoecology for notosuchians in the Brazilian Upper Cretaceous Bauru Group

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Serval ID
serval:BIB_C3592ACABA58
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
A bone to pick: stable isotope compositions as tracers of food sources and paleoecology for notosuchians in the Brazilian Upper Cretaceous Bauru Group
Journal
Cretaceous Research
Author(s)
Klock Carolina, Leuzinger Léa, Santucci Rodrigo Miloni, Martinelli Agustín G., Marconato André, Marinho Thiago S., Luz Zoneibe, Vennemann Torsten
ISSN
0195-6671
Publication state
Published
Issued date
03/2022
Peer-reviewed
Oui
Volume
131
Pages
105113
Language
english
Abstract
Notosuchia is a highly diverse group of crocodyliforms that peaked during the Cretaceous period. Their taxonomic abundance and morphological disparity in the Upper Cretaceous Bauru Group (Bauru Basin, Brazil) is remarkable, with over 20 species reported. The stable carbon and oxygen isotope composition of notosuchian bioapatite from two sites (i.e., the Ponto 1 do Price and Fazenda Três Antas) in west Minas Gerais State was analyzed to evaluate differences in feeding habits among the taxa found in both localities. Possible environmental stressors are examined, in parallel to sedimentological, paleopedological, and paleontological studies, which indicate a semi-arid to arid climate for the Bauru Group. Multiple tissues of notosuchian crocodyliforms were included in our study, as well as a testudines carapace fragment, lepisosteiform fish teeth and scales, and host rocks. The mineral textures, X-ray diffraction and stable isotope data support preservation of tooth enamel and scale ganoin bioapatite. The δ13C results point to different feeding habits between two terrestrial, carnivore notosuchians, namely a terrestrial source diet for Uberabasuchus terrificus and an aquatic source diet for Campinasuchus dinizi. The δ18Ow for the crocodyliform data was calculated and compared to other Upper Cretaceous sites. Values support dry conditions during the formation of the bioapatite for the Fazenda Três Antas site and point to the Hateg Basin in Romania, yet likely younger, as a good paleoclimatic analogue.
Keywords
Crocodyliformes, Hydroxyapatite, Carbon isotopes, Oxygen isotopes, Upper Cretaceous, Bauru Group
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Create date
31/08/2022 22:14
Last modification date
22/07/2023 5:58
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