Browsing by Author "Luyt, Julie"

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    Revisiting the palaeoenvironments of the South African hominid-bearing Plio Pleistocene sites : new isotopic evidence from Sterkfontein
    (2001) Luyt, Julie; Lee-Thorp, Julia A
    This thesis offers a revised palaeoenvironmental reconstruction of South African PlioPleistocene sites based on δ¹³C and δ¹⁸O isotopes extracted from enamel of fossil fauna. New isotopic results from Sterkfontein Members 4 and 5 are reported to supplement existing data from Makapansgat and Swartkrans in order to examine the changing environment from approximately 3 to 1.4 million years ago (Ma).
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    Utilization of savanna-based resources by Plio-Pleistocene baboons
    (2005) Codron, Daryl; Luyt, Julie; Lee-Thorp, Julia A; Sponheimer, Matt; DeRuiter, Darryl; Codron, Jacqui
    We have determined the tooth enamel carbonate 13C values of five cercopithecoid taxa from the Plio-Pleistocene deposits of Swartkrans Members 1 and 2 and Sterkfontein Member 4. These data were used to determine the relative proportions of C3 and C4 biomass consumed by extinct baboons and contemporary non-human primates. We compared these results with data on modern Papio hamadryas ursinus from different savanna areas in South Africa, as well as with published isotopic data and dietary interpretations based on molar morphology of these taxa. The data reveal little evidence for use of grasses or grass-based foods by modern South African baboons. The fossil papionins Papio hamadryas robinsoni, Papio (Dinopithecus) ingens, and Parapapio spp., however, utilized more savanna-based C4 resources than previously predicted (particularly in the case of P. (D.) ingens). Theropithecus oswaldi had 13C values depicting, as expected, a largely grass-based diet, and we confirm earlier conclusions that this species incorporated a wider range of food items into its diet than do modern T. gelada, as reported in the literature. The colobine monkey, Cercopithecoides williamsi, made extensive use of savanna-.based C4 foods, confirming some degree of terrestrial foraging by the species.