Dietary change among hominins and cercopithecids in Ethiopia during the early Pliocene.

Bibliographic Collection: 
Publication Type: Journal Article
Authors: Levin, Naomi E; Haile-Selassie, Yohannes; Frost, Stephen R; Saylor, Beverly Z
Year of Publication: 2015
Journal: Proc Natl Acad Sci U S A
Volume: 112
Issue: 40
Pagination: 12304-9
Date Published: 2015 Oct 6
Publication Language: eng
ISSN: 1091-6490
Keywords: Animals, Biological Evolution, Carbon Isotopes, Carbonates, Cercopithecinae, Diet, Fossils, Hominidae, Oxygen Isotopes, Plants, Edible, Radiometric Dating, Soil, Tooth

The incorporation of C4 resources into hominin diet signifies increased dietary breadth within hominins and divergence from the dietary patterns of other great apes. Morphological evidence indicates that hominin diet became increasingly diverse by 4.2 million years ago but may not have included large proportions of C4 foods until 800 thousand years later, given the available isotopic evidence. Here we use carbon isotope data from early to mid Pliocene hominin and cercopithecid fossils from Woranso-Mille (central Afar, Ethiopia) to constrain the timing of this dietary change and its ecological context. We show that both hominins and some papionins expanded their diets to include C4 resources as early as 3.76 Ma. Among hominins, this dietary expansion postdates the major dentognathic morphological changes that distinguish Australopithecus from Ardipithecus, but it occurs amid a continuum of adaptations to diets of tougher, harder foods and to committed terrestrial bipedality. In contrast, carbon isotope data from cercopithecids indicate that C4-dominated diets of the earliest members of the Theropithecus oswaldi lineage preceded the dental specialization for grazing but occurred after they were fully terrestrial. The combined data indicate that the inclusion of C4 foods in hominin diet occurred as part of broader ecological changes in African primate communities.

DOI: 10.1073/pnas.1424982112
Alternate Journal: Proc. Natl. Acad. Sci. U.S.A.