Comparative isotope ecology of western Amazonian rainforest mammals

Julia V. Tejada, John J. Flynn, Pierre Olivier Antoine, Victor Pacheco, Rodolfo Salas-Gismondi, Thure E. Cerling

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Closed-canopy rainforests are important for climate (influencing atmospheric circulation, albedo, carbon storage, etc.) and ecology (harboring the highest biodiversity of continental regions). Of all rainforests, Amazonia is the world's most diverse, including the highest mammalian species richness. However, little is known about niche structure, ecological roles, and food resource partitioning of Amazonian mammalian communities over time. Through analyses of δ13Cbioapatite, δ13Chair, and δ15Nhair, we isotopically characterized aspects of feeding ecology in a modern western Amazonian mammalian community in Peru, serving as a baseline for understanding the evolution of Neotropical rainforest ecosystems. By comparing these results with data from equatorial Africa, we evaluated the potential influences of distinct phylogenetic and biogeographic histories on the isotopic niches occupied by mammals in analogous tropical ecosystems. Our results indicate that, despite their geographical and taxonomic differences, median δ13Cdiet values from closed-canopy rainforests in Amazonia (-27.4‰) and equatorial Africa (-26.9‰) are not significantly different, and that the median δ13Cdiet expected for mammalian herbivores in any closed-canopy rainforest is -27.2‰. Amazonian mammals seem to exploit a narrower spectrum of dietary resources than equatorial African mammals, however, as depicted by the absence of highly negative δ13Cdiet values previously proposed as indicative of rainforests (<-31‰). Finally, results of keratin and bioapatite δ13C indicate that the predictive power of trophic relationships, and traditional dietary ecological classifications in bioapatite-protein isotopic offset expectations, must be reconsidered.

Original languageEnglish
Pages (from-to)26263-26272
Number of pages10
JournalProceedings of the National Academy of Sciences of the United States of America
Volume117
Issue number42
DOIs
StatePublished - 20 Oct 2020

Bibliographical note

Funding Information:
ACKNOWLEDGMENTS. This work was funded by the NSF-Inter University Training in Continental Scale Ecology (EF-1137336) through a research in residence program, Columbia University and Richard Gilder Graduate School (AMNH) fellowships granted to J.V.T., and the Frick Fund (Division of Paleontology, AMNH). We are indebted to five anonymous reviewers and the editor for thoughtful suggestions that significantly improved the quality of this contribution. We thank J. Ehleringer, IsoCamp instructors, F. Smith, and faculty at the CSI-UNM for fruitful discussions during manuscript preparation; R. MacPhee and N. Duncan at the American Museum of Natural History; students at the Museo de Historia Natural-UNMSM; and S. Chakra-borty at SIRFER for help during sampling collection and analyses. We also thank K. Uno for lending his laboratory for sample preparation, N. Levin for providing African data, and J. Denton for assistance and advice with computer programming and data analyses.

Funding Information:
This work was funded by the NSF-Inter University Training in Continental Scale Ecology (EF-1137336) through a research in residence program, Columbia University and Richard Gilder Graduate School (AMNH) fellowships granted to J.V.T., and the Frick Fund (Division of Paleontology, AMNH). We are indebted to five anonymous reviewers and the editor for thoughtful suggestions that significantly improved the quality of this contribution. We thank J. Ehleringer, IsoCamp instructors, F. Smith, and faculty at the CSI-UNM for fruitful discussions during manuscript preparation; R. MacPhee and N. Duncan at the American Museum of Natural History; students at the Museo de Historia Natural-UNMSM; and S. Chakraborty at SIRFER for help during sampling collection and analyses. We also thank K. Uno for lending his laboratory for sample preparation, N. Levin for providing African data, and J. Denton for assistance and advice with computer programming and data analyses.

Publisher Copyright:
© 2020 National Academy of Sciences. All rights reserved.

Keywords

  • Closed canopy rainforests
  • Isotope ecology
  • Mammals
  • Stable isotopes
  • Western Amazonia

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