Ardipithecus ramidus and the paleobiology of early hominids

Science

Volumn 326, Issue 5949, 2009, Pages 75-86

  White, Tim D ^a   Asfaw, Berhane ^b   Beyene, Yonas ^c   Haile Selassie, Yohannes ^d   Lovejoy, C Owen ^e   Suwa, Gen ^f   Woldegabriel, Giday ^g  

^a UNIVERSITY OF CALIFORNIA   (United States)

^b Rift Valley Research Service Addis Ababa   (Ethiopia)

^c Ministry of Youth Sports and Culture ^*  (Ethiopia)

^d CLEVELAND MUSEUM OF NATURAL HISTORY   (United States)

^e KENT STATE UNIVERSITY   (United States)

^f UNIVERSITY OF TOKYO   (Japan)

^g LOS ALAMOS NATIONAL LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ADAPTATION; BIPEDALISM; COMMON ANCESTRY; EVOLUTIONARY BIOLOGY; FOSSIL RECORD; HOMINID; PALEOBIOLOGY; SOCIAL BEHAVIOR;

ADAPTATION; AFRICA; APE; ARBOREAL SPECIES; ARDIPITHECUS RAMIDUS; ARTICLE; BIOLOGY; CANINE TOOTH; CHIMPANZEE; CLIMBING; DIET; ECOLOGY; ETHIOPIA; EVOLUTION; EXTANT SPECIES; FOOT; FOREST; FOSSIL; GENETIC SIMILARITY; HABITAT; HAND; HOMINID; HUMAN; LIMB; MORPHOLOGY; NONHUMAN; PELVIS; PHOTOSYNTHESIS; PLANT; PREMOLAR TOOTH; PRIORITY JOURNAL; SEDIMENT; SKELETON; SKULL; SOCIAL BEHAVIOR; TERRESTRIAL SPECIES; WALKING;

ANIMALS; BIOLOGICAL EVOLUTION; BONE AND BONES; DENTITION; DIET; ECOSYSTEM; ENVIRONMENT; ETHIOPIA; FOSSILS; GEOLOGIC SEDIMENTS; GEOLOGICAL PHENOMENA; HOMINIDAE; HUMANS; LOCOMOTION; PALEODONTOLOGY; PAN TROGLODYTES; PHYLOGENY; SKELETON; SKULL; SOCIAL BEHAVIOR; TOOTH;

AFAR; AFRICA; EAST AFRICA; ETHIOPIA; SUB-SAHARAN AFRICA;

ARDIPITHECUS RAMIDUS; AUSTRALOPITHECUS; HOMINIDAE; PAN;

EID: 70349682738     PISSN: 00368075     EISSN: 10959203     Source Type: Journal    
DOI: 10.1126/science.1175802     Document Type: Article

References (83)

1. C. Darwin, The Descent of Man, and Selection in Relation to Sex (John Murray, London, 1871).
2. We here consider Hominidae to include modern humans and all taxa phylogenetically closer to humans than to Pan (common chimpanzee and bonobo), that is, all taxa that postdate the split between the lineage leading to modern humans and the lineage that led to extant chimpanzees.
3. T. H. Huxley, Evidence as to Man's Place in Nature (London, 1863).
4. V. M. Sarich, A. C. Wilson, Proc. Natl. Acad. Sci. U.S.A. 58, 142 (1967).
5. D. C. Johanson, M. Taieb, Y. Coppens, Am. J. Phys. Anthropol. 57, 373 (1982).
6. M. D. Leakey et al., Nature 262, 460 (1976).
7. T. D. White et al., Nature 440, 883 (2006).
8. W. H. Kimbel et al., J. Hum. Evol. 51, 134 (2006).
9. G. WoldcGabricl et al., Nature 371, 330 (1991).
10. T. D. White, G. Suwa, B. Asfaw, Nature 371, 306 (1994).
11. Y. Haile-Selassie, Nature 412, 178 (2001).
12. Y. Haile-Selassie, G. Suwa, T. D. White, in Ardipithecus kadabba: Late Miocene Evidence from the Middle Awash, Ethiopia, Y. Haile-Sclassic, G. WoldcGabricl, Eds. (University of California, Berkeley, CA, 2009), pp. 159-236.
13. B. Senut et al., Comptes Rendus de l'Academie des Sciences, Series IIA: Earth and Planetary Science 332, 137 (2001).
14. M. Brunet et al., Nature 418, 145 (2002).
15. Y. Haile-Selassie, G. Suwa, T. D. White, Science 303, 1503 (2004).
16. ]. Moore, in Creat Ape Societies, W. C. McGrew et al., Eds. (Cambridge Univ. Press, Cambridge, 1996), pp. 275-292.
17. B. G. Richmond, D. R. Begun, D. S. Strait, Yearb. Phys. Anthropol. 44, 70 (2001).
18. R. Wrangham, D. Pilbeam, in All Apes Great and Small, Volume 1: African Apes, B. Galdikas et al., Eds. (Kluwer Academic/Plenum, New York, 2001), pp. 5-17.
19. J. T. Stern, R. L. Susman, Am. J. Phys. Anthropol. 60, 279 (1983).
20. J. T. Stern, Evot. Anthropol. 9, 113 (2000).
21. B. Latimer, in Origines de la Bipedie chez les Hominides, B. Scnut, Y. Coppcns, Eds. (Editions CNRS, Paris, 1991), pp. 169-176.
22. G. Suwa et al., Science 326, 69 (2009).
23. G. Suwa et at., Science 326, 68 (2009).
24. C. O. Lovejoy et al., Science 326, 70 (2009).
25. C. O. Lovejoy et al., Science 326, 71 (2009).
26. C. O. Lovejoy et al., Science 326, 72 (2009).
27. C. O. Lovejoy et al., Science 326, 73 (2009).
28. G. WoldcGabriel et al., Science 326, 65 (2009).
29. A. Louchart et al., Science 326, 66 (2009).
30. T. D. White et al., Science 326, 67 (2009).
31. C. O. Lovejoy, Science 326, 74 (2009).
32. H. Gilbert, B. Asfaw (Eds.), Homo erectus: Pleistocene Evidence from the Middle Awash, Ethiopia (Univ. California Press, Berkeley, CA, 2008).
33. Y. Haile-Selassie, G. WoldeGabriel (Eds.), Ardipithecus kadabba: Late Miocene Evidence from the Middle Awash, Ethiopia (Univ. California Press, Berkeley, California, 2009).
34. P. R. Renne, G. WoldeGabriel, W. K. Hart, G. Heiken, T. D. White, Geol. Soc. Am. Bull. 111, 869 (1999).
35. In 1994, the Middle Awash project instituted "crawls" of sedimentary outcrop between the GATC and DABT to collect all available fossil material. Crawls were generally upslope in direction, done by teams of 5 to 15 collectors who crawled the surface on hands and knees, shoulder to shoulder, collecting all fossilized biological materials between a prescribed pair of taut nylon cords. Surfaces were repeatedly collected with this technique, invariably resulting in successively depressed specimen recovery numbers in subsequent field seasons.
36. S. Semaw et al., Nature 433, 301 (2005).
37. No surface or in situ fragments of the ARA-VP-6/500 specimen are duplicate anatomical elements. Only 7.3% of 136 total pieces (table S2) were surface recoveries at the excavation site. All other pieces were excavated in situ. Preservation is identical across the entire recovered set. There is no evidence of multiple maturational ages among the 136 pieces, and many of them conjoin. Given the close stratigraphic and spatial association (Fig. 2), and given no evidence of any other individual from the carefully excavated spatiostratigraphic envelope, we conclude that the parts of the ARA-VP-6/500 specimen represent a single individual's disarticulated skeleton.
38. S. Elton, J. Anat. 212, 377 (2008).
39. A. K. Behrensmeyer, Paleobiology 8, 211 (1981).
40. S. M. Kidwell, K. W. Flessa, Annu. Rev. Earth Planet. Sci. 24, 433 (1996).
41. D. Western, A. K. Behrensmeyer, Science 324, 1061 (2009).
42. R. Pik, B. Marty, J. Carignan, J. Lavé, Earth Planet. Sci. Lett. 215, 73 (2003).
43. A. V. Fedorov et al., Science 312, 1485 (2006).
44. T. D. White, G. Suwa, B. Asfaw, Nature 375, 88 (1995).
45. A. Hill, S. Ward, Yearb. Phys. Anthropol. 31, 49 (1987).
46. M. G. Leakey, J. M. Harris, Eds., Lothagam: The Dawn of Humanity in Eastern Africa (Columbia Univ. Press, New York).
47. J. Kappelman et al., Nature 376, 558 (1995).
48. T. D. White, in The Paleobiological Revolution: Essays on the Growth of Modern Paleontology, D. Sepkoski, M. Ruse, Eds. (Univ. of Chicago Press, Chicago, 2009), pp. 121-148.
49. P. L. Reno, R. S. Meindl, M. A. McCollum, C. O. Lovejoy, Proc. Natl. Acad. Sci. U.S.A. 100, 9404 (2003).
50. M. Brunet et al., Nature 434, 752 (2005).
51. B. Wood, Nature 418, 133 (2002).
52. S. J. Gould, R. C. Lewontin, Proc. R. Soc. London Ser. B. 205, 147 (1979).
53. C. O. Lovejoy, R. S. Meindl, J. C. Ohman, K. G. Heiple, T. D. White, Am. J. Phys. Anthropol. 119, 97 (2002).
54. C. O. Lovejoy, M. J. Cohn, T. D. White, Proc. Natl. Acad. Sci. U.S.A. 96, 13247 (1999).
55. M. A. McCollum et al., J. Exp. Zool. B MoL Dev. Evol. 312, published online 17 August 2009; 10.1002/jez.b.21316.
56. T. H. Huxley, Westminster Rev. 73, 541 (1860).
57. L. de Bonis, G. D. Koufos, Evol. Anthropol. 3, 75 (1994).
58. D. R. Begun, Anthropol. Sci. 113, 53 (2005).
59. J. Palfy et al., Earth Planet. Sci. Lett. 258, 160 (2007).
60. D. Pilbeam, N. Young, C. R. Palevol 3, 305 (2004).
61. D. S. Stern, V. Orgogozo, Science 323, 746 (2009).
62. M. D. Shapiro, M. A. Bell, D. M. Kingsley, Proc. Natl. Acad. Sci. U.S.A. 103, 13753 (2006).
63. N. Shubin, C. Tabin, S. Carroll, Nature 457, 818 (2009).
64. P. F. Colosimo et al., Science 307, 1928 (2005).
65. L Hlusko, G. Suwa, R. T. Kono, M. C. Mahaney, Am. J. Phys. Anthropol. 124, 223 (2004).
66. M. J. F. Pulquerio, R. A. Nichols, Trends Ecol. Evol. 22, 180 (2007).
67. N. Elango, J. W. Thomas, S. V. Yi, Proc. Natl. Acad. Sci. U.S.A. 103, 1370 (2006).
68. R. J. Britten, Proc. Natl. Acad. Sci. U.S.A. 99, 13633 (2002).
69. G. Suwa, R. T. Kono, S. Katoh, B. Asfaw, Y. Beyene, Nature 448, 921 (2007).
70. N. Patterson, D. J. Richter, S. Gnerre, E. S. Lander, D. Reich, Nature 441, 1103 (2006).
71. D. S. Strait, F. E. Grine, J. Hum. Evol. 47, 399 (2004).
72. E. Trinkaus, Am. J. Phys. Anthropol. 83, 1 (1990).
73. For example, it has been noted that these methods fail to accurately resolve relationships of modern hominoid species without sufficient intermediate forms from a fossil record (71).
74. 1's in Au. afarensis (and thereafter an increasing robusticity of the roots themselves in Australopithecus), either there was selection for larger, more complex premolar root systems or such morphologies emerged as pleiotropy of postcanine enhancement. Without such selection, Ar. ramidus as a species probably contained regional populations that varied in premolar root number (22).
75. B. Senut, M. Pickford, C. R. Polevol. 3, 265 (2004).
76. H. Gee, Deep Time: Cladistics, the Revolution in Evolution (Free Press, London, 1999).
77. C. V. Ward, A. C. Walker, M. G. Leakey, Evol. Anthropol. 7, 197 (1999).
78. We use genera to express both phyletic proximity and circumscribed adaptive systems, with ecobehavioral and morphological conditions being integral parts of the latter. This use employs the broadly defined genus Australopithecus, without recognizing the now commonly used Paranthropus (82). This is because both "robust" and "nonrobust" Australopithecus species are characterized by a commonly derived heavy masticatory apparatus (albeit to differing degrees), and also because we cannot-even to this day-be certain that the "robust" species are monophyletic.
79. C. O. Lovejoy, Gait Posture 21, 95 (2005).
80. C. O. Lovejoy, Gait Posture 21, 13 (2005).
81. C. O. Lovejoy, Gait Posture 25, 325 (2007).
82. T. D. White, in The Primate Fossil Record, W. Hartwig, Ed. (Cambridge Univ. Press, Cambridge), pp. 407-417.
83. For funding, we thank NSF (this material is based on work supported by grants 8210897, 9318698, 9512534, 9632389, 9729060, 9727519, 9910344, and 0321893 HOMINID-RHOI), the Institute of Geophysics and Planetary Physics of the University of California at Los Alamos National Laboratory (LAND, and the Japan Society for the Promotion of Science. D. Clark and C. Howell inspired this effort and conducted laboratory and field research. We thank the coauthors of the companion papers (22-30), with special thanks to the ARA-VP-6/500 and -7/2 excavation teams, including A. Amzaye, the Alisera Afar Clan, Lu Baka, A. Bears, D. Brill, J. M. Carretero, S. Cornero, D. DoGusta, A. Defleur, A. Dessie, G. Fule, A. Getty, H. Gilbert, E. Gùloç., G. Kadir, B. Latimer, D. Pennington, A. Sevim, S. Simpson, D. Trachewsky, and S. Yoseph. G. Curtis, J. DeHeinzelin, and G. Heiken provided field geological support. D. Helgren, D. DcGusta, L Hlusko, and H. Gilbert provided insightful suggestions and advice. We thank H. Gilbert, K. Brudvik, L Bach, D. Paul, B. Daniels, and D. Brill for illustrations; G. Richards and A. Mleczko for imaging; the Ministry of Tourism and Culture, the Authority for Research and Conservation of the Cultural Heritage, and the National Museum of Ethiopia for permissions and facilitation; and the Afar Regional Government, the Afar people of the Middle Awash, and many other field workers who contributed directly to the research efforts and results.