Isotopic paleoecology (δ13C, δ18O) of late Quaternary herbivorous mammal assemblages from southwestern Amazon

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Article

Asevedo, Lidiane^1,2  Ranzi, Alceu³  Kalliola, Risto⁴  Parssinen, Martti⁵  Ruokolainen, Kalle⁶  Cozzuol, Mario Alberto⁷  do Nascimento, Ednair Rodrigues⁸  Negri, Francisco Ricardo⁹  Souza-Filho, Jonas P.³  Cherkinsky, Alexander¹⁰  Trindade Dantas, Mario Andre^1,2 

[1] Univ Fed Sergipe, Programa Posgrad Ecol & Conservacao, PPEC, Av Marechal Rondon S-N, BR-49100000 Sao Cristovao, Sergipe, Brazil

[2] Univ Fed Bahia, Inst Multidisciplinar Saude, Lab Ecol & Geociencias, R Rio Contas 58, Vitoria Da Conquista, BA, Brazil

[3] Univ Fed Acre, Lab Pesquisas Paleontol, Dept Ciencias Nat, BR 364 Km 4, BR-69915900 Rio Branco, Acre, Brazil

[4] Univ Turku, Dept Geog & Geol, Turku 20014, Finland

[5] Univ Helsinki, Dept World Cultures, Helsinki, Finland

[6] Univ Turku, Dept Biol, Turku 20014, Finland

[7] Univ Fed Minas Gerais, Dept Zool, Inst Ciencias Biol, Av Antonio Carlos 667, BR-31270910 Belo Horizonte, MG, Brazil

[8] Museu Estadual Rondonia, Av Sete Setembro 237, BR-76801045 Porto Velho, Rondonia, Brazil

[9] Univ Fed Acre, Lab Paleontol, Campus Floresta, BR-69980000 Cruzeiro Do Sul, Acre, Brazil

[10] Univ Georgia, Ctr Appl Isotope Studies, Athens, GA 30602 USA

关键词: Pleistocene;    Amazonia;    Megafauna;    Paleodiet;    Stable isotopes;    AMS C-14 dating;   

DOI  :  10.1016/j.quascirev.2020.106700

来源: Elsevier

【 摘 要 】

We report the first radiocarbon datings and carbon (delta C-13) and oxygen (delta O-18) stable isotopes data to reconstruct the paleoecology of medium to large herbivorous mammals from late Quaternary of southwestern Amazon (Acre and Rondonia states, Brazil). AMS C-14 dates for Neochoerus sp. (29,072 - 27,713 Cal yr BP), Notiomastodon platensis (25,454 - 24,884 Cal yr BP) and Eremotherium laurillardi (11,320 - 11,131 Cal yr BP) support the Lujanian ages. All fossils have low delta C-13 and delta O-18 isotopic values that suggest C3-dominated environments from closed canopy forests to wooded savannas, agreeing with paleovegetation reconstitution. Most species were browsers (piC(3)=100%; Niche breadth, B-A=0), where the key species with the largest body mass, N. platensis (similar to 6,300 kg) and E. laurillardi (similar to 3,500 kg), possibly had a more generalized browser diet in closed-canopies to woodlands. Their diet distinguished from the C-3/C-4 generalist Trigodonops lopesi (similar to 1,900 kg), which foraged in wooded savannas (p(i)C(3=)70%; B-A=0.72), similarly with its relative Toxodon platensis (similar to 1,800 kg) that had a browse-dominated mixed feeder diet (p(i)C(3) >= 84%, B-A <= 0.38) in Peruvian and Bolivian Amazon localities. Palaeolama major (similar to 280 kg) was possibly a strictly folivorous within forest canopies, whereas Tapirus sp. (similar to 250 kg) and Mazama sp. (similar to 40 kg) were browsers in closed-canopies to woodlands. Holmesina rondoniensis (similar to 120 kg) was a browser but not restricted, where could also feed on herbaceous from understories in woodlands, and Neochoerus sp. (similar to 200 kg) feeding predominantly herbaceous plants in wooded savannas (piC(3)=69%; B-A=75). We estimate that the interspecific competition could have been avoid by different feeding strategies, although more investigations are still needed to better understand their ecological interactions in the habitats of the southwestern Amazon during the late Quaternary. (C) 2020 Elsevier Ltd. All rights reserved.

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