A miocene hyperdiverse crocodilian community reveals peculiar trophic dynamics in proto-Amazonian mega-wetlands

Rodolfo Salas-Gismondi, John J. Flynn, Patrice Baby, Julia V. Tejada-Lara, Frank P. Wesselingh, Pierre Olivier Antoine

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

93 Citas (Scopus)

Resumen

All rights reserved. Amazonia contains one of the world’s richest biotas, but origins of this diversity remain obscure. Onset of the Amazon River drainage at approximately 10.5 Ma represented a major shift in Neotropical ecosystems, and proto-Amazonian biotas just prior to this pivotal episode are integral to understanding origins of Amazonian biodiversity, yet vertebrate fossil evidence is extraordinarily rare. Two new species-rich bonebeds from late Middle Miocene proto-Amazonian deposits of northeastern Peru document the same hyperdiverse assemblage of seven co-occurring crocodylian species. Besides the large-bodied Purussaurus and Mourasuchus, all other crocodylians are new taxa, including a stem caiman—Gnatusuchus pebasensis—bearing a massive shovel-shaped mandible, procumbent anterior and globular posterior teeth, and a mammal-like diastema. This unusual species is an extreme exemplar of a radiation of small caimans with crushing dentitions recording peculiar feeding strategies correlated with a peak in proto-Amazonian molluscan diversity and abundance. These faunas evolved within dysoxic marshes and swamps of the long-lived Pebas Mega-Wetland System and declined with inception of the transcontinental Amazon drainage, favouring diversification of longirostrine crocodylians and more modern generalist-feeding caimans. The rise and demise of distinctive, highly productive aquatic ecosystems substantially influenced evolution of Amazonian biodiversity hotspots of crocodylians and other organisms throughout the Neogene.
Idioma originalInglés estadounidense
PublicaciónProceedings of the Royal Society B: Biological Sciences
Volumen282
N.º1804
DOI
EstadoPublicada - 1 ene. 2015

Palabras clave

  • Caimanine crocodylians
  • Durophagy
  • Miocene
  • Molluscs
  • Pebas system
  • Proto-Amazonia

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