Isotopic Evidence for the Diet of an Early Hominid, Australopithecus africanus
Tóm tắt
Current consensus holds that the 3-million-year-old hominid
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Tài liệu tham khảo
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Carbon isotope compositions are expressed as δ 13 C values in parts per thousand (‰) relative to the Pee Dee Belemnite standard (a fossil Belemnitella americana ): δ 13 C = ( 13 C/ 12 C sample / 13 C/ 12 C standard –1 ) × 1000.
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The tooth enamel of macrofauna is usually enriched by about 12‰ as compared to diet values [
] but may be enriched by as much as 14‰ (22).
Lee-Thorp J. A., Manning L., Sponheimer M., Bull. Soc. Geol. Fr. 168, 767 (1997);
. Three milligrams of enamel powder was obtained with a rotary drill equipped with a diamond-tipped burr. Nonhominid permanent molars were sampled on the lingual surface; broken hominid permanent molars were sampled between the crown surface and the enamel-dentine junction so that external morphology and wear patterns were not altered. The powder was pretreated with 1.5% sodium hypochlorite solution to remove organic contaminants and 0.1 M acetic acid to remove diagenetic carbonates. The samples were freeze-dried and placed into individual reaction vessels in a Kiel II autocarbonate device. They were reacted with phosphoric acid at 70°C and clean dry CO 2 was obtained by cryogenic distillation. 13 C/ 12 C ratios were measured on a Finnigan MAT 252 mass spectrometer with a precision of ±0.1‰.
C 3 signatures indicate that these herbivores were browsers or browser/frugivores because there is no evidence of C 3 grasses (as evidenced by grazer δ 13 C values) at Makapansgat.
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J. A. Lee-Thorp unpublished material.
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We thank S. Ambrose L. Berger R. Blumenschine S. Cachel R. Clarke C. Feibel C. Gow J. Harris T. Hoffman P. Koch Y. Lam J. Lanham D. Lieberman C. Lockwood J. Moggi-Cecchi R. Palumbit J. Parkington S. Pfeiffer M. Raath Y. Rahman K. Reed B. Rubidge C. Schrire J. Sealy S. Semaw A. Sillen J. Tactikos P. Tobias P. Ungar and N. van der Merwe. This research was funded by NSF the Foundation for Research Development the Leakey Foundation the Wenner-Gren Foundation the Boise Fund Rutgers University and the University of Cape Town.