Calcium isotopic ecology of Turkana Basin hominins.

Nature Communications
Jeremy E MartinVincent Balter

Abstract

Diet is a major driver of hominin evolution, but most of the geochemical evidence relies on carbon isotopes (δ13C). Here, we report enamel stable calcium isotope (δ44/42Ca) values against δ13C values for several hominins and co-existing primates in the Turkana Basin area, circa 4 to 2 Ma. Australopithecus anamensis clusters with mammal browsers, Kenyanthropus platyops is distinct from A. anamensis in foraging into more open environments and the coexisting Theropithecus brumpti encompasses both the grazer and omnivore/carnivore domains. Early Homo is remarkable for its wide distribution in δ44/42Ca values, possibly reflecting omnivorous and opportunistic preferences. Paranthropus boisei is uniquely distributed in the δ13C versus δ44/42Ca iso-space being distinct from all other hominins from the Turkana Basin area as well as from the co-existing Theropithecus oswaldi. Several hypotheses are explored to discuss the unique δ44/42Ca values of Paranthropus boisei including significant differences observed with δ44/42Ca values recently reported for P. robustus from South Africa, questioning the monophyly of this genus.

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Citations

Apr 1, 2021·Scientific Reports·Rhonda L Quinn, Christopher J Lepre
Apr 22, 2021·Metallomics : Integrated Biometal Science·Auguste HasslerVincent Balter
May 27, 2021·Journal of Human Evolution·Paul J Constantino, Kathryn A Konow

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