23 results on '"Wood, Bernard"'
Search Results
2. WELCOME TO THE FAMILY.
- Author
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Wood, Bernard
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PALEOANTHROPOLOGY , *AUSTRALOPITHECINES , *FOSSIL hominids , *EVOLUTIONARY theories - Abstract
The article focuses on the evolution of Homo erectus alongside the evolution of other hominin species. Topics include the how paleoanthropologists use fossil remains to determine human evolution, the evolution of Neanderthals, and discoveries of Australopithecus remains. Information is provided on researcher Charles Darwin's theory of evolution.
- Published
- 2014
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3. Meet Your Exotic, Extinct Close Relative.
- Author
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Wood, Bernard and Williams, Alexis
- Subjects
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PARANTHROPUS , *AUSTRALOPITHECINES , *FOSSIL hominids , *FOSSIL hominid craniology , *HUMAN beings - Abstract
The article focuses on Paranthropus boisei, which belonged to the hominins that lived in East African and was believed to be an extinct but close relative of modern humans. Topics discussed include its distinctive physical features that included a smaller brain and a massive set of molar and premolar teeth and additional evidence of the hominin from East Africa, particularly in Koobi Fora in Kenya.
- Published
- 2020
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4. Towards a more realistic interpretation of the human fossil record.
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Wood, Bernard and Smith, Richard J.
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FOSSILS , *FOSSIL hominids , *CONFIRMATION bias , *HOMINIDS - Abstract
The majority of attempts to reconstruct the evolutionary history of the hominin clade proceed as if the hominin fossil record is a precise, accurate, and comprehensive record of human evolutionary history. In this contribution we review the various ways in which the apparent scarcity of early hominins on the landscape means that the existing hominin fossil record almost certainly falls short of this assumption, especially with respect to taxic diversity, as well as the spatial and temporal distribution of known taxa. We also suggest that interpretations of the hominin fossil record are particularly affected by practices that likely violate the principles of reproducibility, as well as by confirmation bias. The hominin fossil record should be seen for what it is; an incomplete record of human evolutionary history that limits what should be said about it. Generated narratives should be treated as heuristic devices, not as accurate and comprehensive descriptions of past events. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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5. Modeling the dental development of fossil hominins through the inhibitory cascade.
- Author
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Schroer, Kes and Wood, Bernard
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DENTITION , *FOSSIL hominids , *FOSSIL primates , *CARNIVOROUS animals , *ANATOMY , *NEW World monkeys - Abstract
The inhibitory cascade is a mathematical model for interpreting the relative size of the occlusal surfaces of mammalian molars in terms of developmental mechanisms. The cascade is derived from experimental studies of mouse molars developed in culture, and has been tested and applied to the dentitions of rodents, ungulates, carnivores, and platyrrhines. Results from such applications have provided new information regarding the origins of plesiomorphic traits in mammalian clade and how derived morphologies may arise. In this study we apply the inhibitory cascade model to the postcanine dentition of a sample of Old World primates that includes fossil hominins. The results of this study suggest that the inhibitory cascade (i.e. M1 < M2 < M3) describes the relative sizes of the molar occlusal areas of Old World primates and is likely the plesiomorphic condition for this clade. Within that clade, whereas most Old World monkeys have a M1 < M2 < M3 pattern, most apes have a M1 < M2 ≈ M3 pattern. This modified cascade suggests that greater levels of inhibition (or less activation) are acting on the posterior molars of apes, thus facilitating the reduction of M3s within the apes. With the exception of the baboon genus Papio, extant congeners typically share the same molar inhibitory cascade. The differences in the relative size relationships observed in the molar and premolar-molar cascades of the species included in the fossil hominin genus Paranthropus suggest that although large postcanine teeth are a shared derived trait within this genus, the developmental basis for postcanine megadontia may not be the same in these two Paranthropus taxa. Our results show that phenotypic characters such as postcanine megadontia may not reflect common development. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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6. First Early Hominin from Central Africa (Ishango, Democratic Republic of Congo).
- Author
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Crevecoeur, Isabelle, Skinner, Matthew M., Bailey, Shara E., Gunz, Philipp, Bortoluzzi, Silvia, Brooks, Alison S., Burlet, Christian, Cornelissen, Els, De Clerck, Nora, Maureille, Bruno, Semal, Patrick, Vanbrabant, Yves, and Wood, Bernard
- Subjects
FOSSIL hominids ,AUSTRALOPITHECINES ,DENTIN ,PLEISTOCENE Epoch ,COMPARATIVE anatomy - Abstract
Despite uncontested evidence for fossils belonging to the early hominin genus Australopithecus in East Africa from at least 4.2 million years ago (Ma), and from Chad by 3.5 Ma, thus far there has been no convincing evidence of Australopithecus, Paranthropus or early Homo from the western (Albertine) branch of the Rift Valley. Here we report the discovery of an isolated upper molar (#Ish25) from the Western Rift Valley site of Ishango in Central Africa in a derived context, overlying beds dated to between ca. 2.6 to 2.0 Ma. We used µCT imaging to compare its external and internal macro-morphology to upper molars of australopiths, and fossil and recent Homo. We show that the size and shape of the enamel-dentine junction (EDJ) surface discriminate between Plio-Pleistocene and post-Lower Pleistocene hominins, and that the Ishango molar clusters with australopiths and early Homo from East and southern Africa. A reassessment of the archaeological context of the specimen is consistent with the morphological evidence and suggest that early hominins were occupying this region by at least 2 Ma. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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7. Distinguishing primate taxa with enamel incremental variables.
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Kufeldt, Chrisandra and Wood, Bernard
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DENTAL enamel , *FISHER discriminant analysis , *FOSSIL hominids , *PRIMATES , *FOSSILS , *PARSIMONIOUS models - Abstract
Enamel has long been of interest for its functional and phylogenetic significance among fossil hominins and other primates. Previous studies demonstrated that enamel incremental features distinguish among hominin fossil taxa, suggesting utility for highlighting taxonomy. However, not all features appear to be useful in mixed samples of fossils, living humans, and apes. Here we tested enamel incremental data from closely related primate taxa to determine which features, if any, distinguish among them. Enamel incremental variables were measured from the M 2 of 40 living primate taxa, and we tested our variables using discriminant function analysis at the taxonomic ranks of parvorder, family, tribe, and genus. We then included enamel incremental data from Australopithecus afarensis , Australopithecus africanus , Paranthropus aethiopicus , Paranthropus boisei , and Paranthropus robustus to determine if these features distinguished fossil taxa from living humans and apes. Our initial results show that enamel incremental variables distinguish among primate taxa, but with low classification rates. Further testing with jackknifing methods shows overlap between groups at all taxonomic ranks, suggesting enamel incremental variables are unreliable for taxonomy. The addition of many common enamel incremental growth variables also resulted in multicollinearity in our multivariate analysis. As the dentition and isolated teeth remain a significant portion of the hominin fossil record, verifying enamel incremental features as a useful taxonomic tool is fundamentally important for hominin paleobiology. [ABSTRACT FROM AUTHOR]
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- 2022
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8. Evaluating the use of pairwise dissimilarity metrics in paleoanthropology.
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Gordon, Adam D. and Wood, Bernard
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PALEOANTHROPOLOGY , *FOSSIL hominids , *TAXONOMY , *STANDARD deviations , *NULL hypothesis , *MORPHOLOGY - Abstract
Abstract: Questions of alpha taxonomy are best addressed by comparing unknown specimens to samples of the taxa to which they might belong. However, analysis of the hominin fossil record is riddled with methods that claim to evaluate whether pairs of individual fossils belong to the same species. Two such methods, log se m and the related STET method, have been introduced and used in studies of fossil hominins. Both methods attempt to quantify morphological dissimilarity for a pair of fossils and then evaluate a null hypothesis of conspecificity using the assumption that pairs of fossils that fall beneath a predefined dissimilarity threshold are likely to belong to the same species, whereas pairs of fossils above that threshold are likely to belong to different species. In this contribution, we address (1) whether these particular methods do what they claim to do, and (2) whether such approaches can ever reliably address the question of conspecificity. We show that log se m and STET do not reliably measure deviations from shape similarity, and that values of these measures for any pair of fossils are highly dependent upon the number of variables compared. To address these issues we develop a measure of shape dissimilarity, the Standard Deviation of Logged Ratios (s LR). We suggest that while pairwise dissimilarity metrics that accurately measure deviations from isometry (e.g., s LR) may be useful for addressing some questions that relate to morphological variation, no pairwise method can reliably answer the question of whether two fossils are conspecific. [Copyright &y& Elsevier]
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- 2013
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9. Reconstructing human evolution: Achievements, challenges, and opportunities.
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Wood, Bernard
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FOSSIL hominids , *FOSSILS , *HUMAN evolution , *TAXONOMY , *PHYLOGENY , *FOSSIL primates - Abstract
This contribution reviews the evidence that has resolved the branching structure of the higher primate part of the tree of life and the substantial body of fossil evidence for human evolution. It considers some of the problems faced by those who try to interpret the taxonomy and systematics of the human fossil record. How do you to tell an early human taxon from one in a closely related dade? How do you determine the number of taxa represented in the human dade? How can homoplasy be recognized and factored into attempts to recover phylogeny? [ABSTRACT FROM AUTHOR]
- Published
- 2010
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10. Evolution of M1 crown size and cusp proportions in the genus Homo.
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Quam, Rolf, Bailey, Shara, and Wood, Bernard
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FOSSILS ,CUSPIDS ,NEANDERTHALS ,FOSSIL hominids ,ONTOLOGY - Abstract
Previous research into tooth crown dimensions and cusp proportions has proved to be a useful way to identify taxonomic differences in Pliocene and Pleistocene fossil hominins. The present study has identified changes in both M
1 crown size and cusp proportions within the genus Homo, with M1 overall crown size reduction apparently occurring in two main stages. The first stage (a reduction of ca. 17%) is associated with the emergence of Homo ergaster and Homo erectus sensu stricto. The second stage (a reduction of ca. 10%) occurs in Homo sapiens, but the reduced modern human M1 tooth crown size was only attained in Upper Paleolithic times. The absolute sizes of the individual cusps are highly positively correlated with overall crown size and dental reduction produces a reduction in the absolute size of each of the cusps. Most of the individual cusps scale isometrically with crown size, but the paracone shows a negative allometric relationship, indicating that the reduction in paracone size is less than in the other M1 cusps. Thus, the phylogenetically oldest cusp in the upper molars also seems to be the most stable cusp (at least in the M1 ). The most striking change in M1 cusp proportions is a change in the relative size of the areas of the paracone and metacone. The combination of a small relative paracone and a large relative metacone generally characterizes specimens attributed to early Homo, and the presence of this character state in Australopithecus and Paranthropus suggests it may represent the primitive condition for the later part of the hominin clade. In contrast, nearly all later Homo taxa, with the exception of Homo antecessor, show the opposite condition (i.e. a relatively large paracone and a relatively small metacone). This change in the relationship between the relative sizes of the paracone and metacone is related to an isometric reduction of the absolute size of the metacone. This metacone reduction occurs in the context of relative stability in the paracone as crown size decreases. Among later Homo taxa, both Homo heidelbergensis and Homo neanderthalensis show a further reduction of the metacone and an enlargement of the hypocone. Fossil and contemporary H. sapiens samples show a trend toward increasing the relative size of the protocone and decreasing the relative size of the hypocone. In Europe, modern human M1 cusp proportions are essentially reached during the Upper Paleolithic. Although some variation was documented among the fossil taxa, we suggest that the relative size of the M1 paracone and metacone areas may be useful for differentiating the earliest members of our genus from subsequent Homo species. [ABSTRACT FROM AUTHOR]- Published
- 2009
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11. The feeding biomechanics and dietary ecology; of Australopithecus africanus.
- Author
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Strait, David S., Weber, Gerhard W., Neubauer, Simon, Chalk, Janine, Richmond, Brian G., Lucas, Peter W., Spencer, Mark A., Schrein, Caitlin, Dechow, Paul C., Ross, Callum F., Grosse, Ian R., Wright, Barth W., Constantin, Paul, Wood, Bernard A., Lawn, Brian, Hylander, William L., Wang, Qian, Byron, Craig, Slice, Dennis E., and Smith, Amanda L.
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FOSSIL hominids ,BIOMECHANICS ,BIOLOGICAL adaptation ,DIET ,NUTRITION - Abstract
The African Plio-Pleistocene hominins known as australopiths evolved a distinctive craniofacial morphology that traditionally has been viewed as a dietary adaptation for feeding on either small, hard objects or on large volumes of food. A historically influential interpretation of this morphology hypothesizes that loads applied to the premolars during feeding had a profound influence on the evolution of australopith craniofacial form. Here, we test this hypothesis using finite element analysis in conjunction with comparative, imaging, and experimental methods. We find that the facial skeleton of the Australopithecus type species, A. africanus, is well suited to withstand premolar loads. However, we suggest that the mastication of either small objects or large volumes of food is unlikely to fully explain the evolution of facial form in this species. Rather, key aspects of australopith craniofacial morphology are more likely to be related to the ingestion and initial preparation of large, mechanically protected food objects like large nuts and seeds. These foods may have broadened the diet of these hominins, possibly by being critical resources that australopiths relied on during periods when their preferred dietary items were in short supply. Our analysis reconciles apparent discrepancies between dietary reconstructions based on biomechanics, tooth morphology, and dental microwear. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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12. Hominid mandibular corpus shape variation and its utility for recognizing species diversity within fossil Homo.
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Lague, Michael R., Collard, Nicole J., Richmond, Brian G., and Wood, Bernard A.
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FOSSIL hominids ,SPECIES diversity ,MULTIVARIATE analysis ,JAWS ,APES - Abstract
Mandibular corpora are well represented in the hominin fossil record, yet few studies have rigorously assessed the utility of mandibular corpus morphology for species recognition, particularly with respect to the linear dimensions that are most commonly available. In this study, we explored the extent to which commonly preserved mandibular corpus morphology can be used to: (i) discriminate among extant hominid taxa and (ii) support species designations among fossil specimens assigned to the genus Homo. In the first part of the study, discriminant analysis was used to test for significant differences in mandibular corpus shape at different taxonomic levels (genus, species and subspecies) among extant hominid taxa (i.e. Homo, Pan, Gorilla, Pongo). In the second part of the study, we examined shape variation among fossil mandibles assigned to Homo (including H. habilis sensu stricto, H. rudolfensis, early African H. erectus/ H. ergaster, late African H. erectus, Asian H. erectus, H. heidelbergensis, H. neanderthalensis and H. sapiens). A novel randomization procedure designed for small samples (and using group ‘distinctness values’) was used to determine whether shape variation among the fossils is consistent with conventional taxonomy (or alternatively, whether a priori taxonomic groupings are completely random with respect to mandibular morphology). The randomization of ‘distinctness values’ was also used on the extant samples to assess the ability of the test to recognize known taxa. The discriminant analysis results demonstrated that, even for a relatively modest set of traditional mandibular corpus measurements, we can detect significant differences among extant hominids at the genus and species levels, and, in some cases, also at the subspecies level. Although the randomization of ‘distinctness values’ test is more conservative than discriminant analysis (based on comparisons with extant specimens), we were able to detect at least four distinct groups among the fossil specimens (i.e. H. sapiens, H. heidelbergensis, Asian H. erectus and a combined ‘African Homo’ group consisting of H. habilis sensu stricto, H. rudolfensis, early African H. erectus/ H. ergaster and late African H. erectus). These four groups appear to be distinct at a level similar to, or greater than, that of modern hominid species. In addition, the mandibular corpora of H. neanderthalensis could be distinguished from those of ‘African Homo’, although not from those of H. sapiens, H. heidelbergensis, or the Asian H. erectus group. The results suggest that the features most commonly preserved on the hominin mandibular corpus have some taxonomic utility, although they are unlikely to be useful in generating a reliable alpha taxonomy for early African members of the genus Homo. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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13. Palaeoanthropology: A precious little bundle.
- Author
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Wood, Bernard
- Subjects
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AUSTRALOPITHECUS afarensis , *FOSSIL hominids , *PALEONTOLOGY , *SKELETON - Abstract
The article focuses on the discovery of a complete 3.3-million-year-old skeleton of a three-year-old Australopithecus afarensis female in Dikika, Ethiopia by Zeresenay Alemseged. There is controversy regarding the posture and locomotion of A. afarensis. Although some parts of the specimen are missing, the preserved parts include the face, the brain case and the base of the cranium.
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- 2006
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14. Patterns of resource use in early Homo and Paranthropus
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Wood, Bernard and Strait, David
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PARANTHROPUS , *BIOLOGICAL extinction , *FOSSIL hominids , *MORPHOLOGY - Abstract
Conventional wisdom concerning the extinction of Paranthropus suggests that these species developed highly derived morphologies as a consequence of specializing on a diet consisting of hard and/or low-quality food items. It goes on to suggest that these species were so specialized or stenotopic that they were unable to adapt to changing environments in the period following 1.5 Ma. The same conventional wisdom proposes that early Homo species responded very differently to the same environmental challenges. Instead of narrowing their niche it was the dietary and behavioral flexibility (eurytopy) exhibited by early Homo that enabled that lineage to persist. We investigate whether evidence taken across eleven criteria supports a null hypothesis in which Paranthropus is more stenotopic than early Homo. In six instances (most categories of direct evidence of dietary breadth, species diversity, species duration, susceptibility to dispersal, dispersal direction, and non-dietary adaptations) the evidence is inconsistent with the hypothesis. Only one line of indirect evidence for dietary breadth—occlusal morphology—is unambiguously consistent with the null hypothesis that Paranthropus'' ability to process tough, fibrous food items (e.g., leaves) was reduced relative to early Homo. Other criteria (habitat preference, population density, direct and indirect evidence of dietary breadth related to incisor use) are only consistent with the hypothesis under certain conditions. If those conditions are not met, then the evidence is either inconsistent with the hypothesis, or ambiguous. On balance, Paranthropus and early Homo were both likely to have been ecological generalists. These data are inconsistent with the conventional wisdom that stenotopy was a major contributing factor in the extinction of the Paranthropus clade. Researchers will need to explore other avenues of research in order to generate testable hypotheses about the demise of Paranthropus. Ecological models that may explain the evolution of eurytopy in early hominins are discussed. [Copyright &y& Elsevier]
- Published
- 2004
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15. Early hominid biogeography.
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Strait, David S. and Wood, Bernard A.
- Subjects
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HOMINIDS , *FOSSIL hominids , *MAMMALS , *PLIOCENE-Pleistocene boundary , *PHYLOGENY - Abstract
Focuses on a study which examined the biogeographic patterns implied by early hominid phylogenies and compared them to the known dispersal patterns of Plio-Pleistocene African mammals. Methodology of the study; Results and discussion; Conclusion.
- Published
- 1999
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16. The Human Genus.
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Wood, Bernard and Collard, Mark
- Subjects
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FOSSILS -- Type specimens , *HOMO habilis , *SCIENTIFIC method , *FOSSIL hominids , *CLASSIFICATION - Abstract
Reviews conventional criteria for allocating fossil species to the genus Homo. Problem of how to incorporate information about evolutionary history into taxonomy; Belief that the problem is exemplified in defining the genus Homo; Criteria found to be either inappropriate or inoperable; Revised definition for Homo; Conclusion that Homo habilis and Homo rudolfensis do not belong in the genus.
- Published
- 1999
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17. Paranthropus boisei: An example of evolutionary stasis?
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Wood, Bernard and Wood, Christopher
- Subjects
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FOSSIL hominids , *PARANTHROPUS - Abstract
States that paranthropus boisei is one of the better known hominid species from fossil records, and the most distinctive. Numbers of derived characters incorporated; Distribution across approximately one million years; Confinement to samples from East African sites; Examination of the hypodigm for evidence of intraspecific phyletic evolution; Evidence from teeth and jaws.
- Published
- 1994
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18. Further analysis of mandibular molar crown and cusp areas in Pliocene early Pleistocene hominids.
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Suwa, Gen and Wood, Bernard A.
- Subjects
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MOLARS , *FOSSIL hominids - Abstract
Analyzes the crown and cusp areas of mandibular molars attributed to Pliocene and early Pleistocene hominids. Establishment of systematic relationships of Pliocene and early Pleistocene hominids; Comparison of measurement methods; Significance of molar cusp proportions.
- Published
- 1994
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19. Palaeoanthropology: Facing up to complexity.
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Wood, Bernard
- Subjects
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FOSSIL hominids , *HOMO habilis , *MANDIBLE - Abstract
The author discusses the study by Meave Leakey and colleagues for the fossils of two Homo lineages from Koobi Fora in northern Kenya that are suggested to be as early as 2 million years ago since 2012. He says that the authors found that non of the well-preserved fossils of face, lower jaw, and fragmentary lower jaw is as old as roughly 2 million years old. He adds that the authors' finding refute the hypothesis that lower jaws like KNM-ER 1802 undergoes the type of face of Homo rudolfensis.
- Published
- 2012
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20. We are what we ate.
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Wood, Bernard and Brooks, Alison
- Subjects
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HOMINIDS , *FOSSIL hominids , *BRAIN evolution , *EVOLUTIONARY theories - Abstract
Focuses on human evolution. Fossil records of hominins, showing resemblance to modern humans; Challenge of the conventional wisdom by O'Connell et al; Hypothetical evolutionary history; Relatively few hominin features in Ardipithecus ramidus; Implications that the increased body mass owing to foraging, combined with access to a more reliable source of meat, allowed the increase in brain size.
- Published
- 1999
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21. Out of Africa and into Asia.
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Wood, Bernard and Turner, Alan
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FOSSIL hominids , *PREHISTORIC peoples - Abstract
Focuses on paleoanthropology studies to determine when hominids first moved out of Africa. Pleistocene deposits at Longgupo Cave in central China; Hominid remains from Indonesia; Dating of the materials.
- Published
- 1995
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22. The oldest hominid yet.
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Wood, Bernard
- Subjects
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FOSSIL hominids , *HUMAN evolution - Abstract
Discusses the discovery in the Awash Valley of Ethiopia of the fossil remains of Australopithecus ramidus. Designation as the oldest hominid species; Background information; Geological context; Paleogeographic reconstruction of area; Characterization of remains; Implications to theories on human evolution.
- Published
- 1994
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23. Rethinking the ecological drivers of hominin evolution.
- Author
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Faith, J. Tyler, Du, Andrew, Behrensmeyer, Anna K., Davies, Benjamin, Patterson, David B., Rowan, John, and Wood, Bernard
- Subjects
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FOSSIL hominids , *FOSSILS , *PALEOECOLOGY , *CENOZOIC Era , *PALEOANTHROPOLOGY - Abstract
A central goal of paleoanthropology is understanding the role of ecological change in hominin evolution. Over the past several decades researchers have expanded the hominin fossil record and assembled detailed late Cenozoic paleoclimatic, paleoenvironmental, and paleoecological archives. However, effective use of these data is precluded by the limitations of pattern-matching strategies for inferring causal relationships between ecological and evolutionary change. We examine several obstacles that have hindered progress, and highlight recent research that is addressing them by (i) confronting an incomplete fossil record, (ii) contending with datasets spanning varied spatiotemporal scales, and (iii) using theoretical frameworks to build stronger inferences. Expanding on this work promises to transform challenges into opportunities and set the stage for a new phase of paleoanthropological research. Research aiming to understand the role of ecological change in hominin evolution has fueled the generation of paleoclimatic and paleoenvironmental records across Africa. Limitations of conventional methods for inferring ecology–evolution relationships mean that more data have not always led to a deeper understanding of hominin evolution. We outline several challenges that have hindered progress, and highlight how recent research is addressing them. This research is confronting the limitations of the fossil record, contending with proxy records spanning a range of spatiotemporal scales, and providing a stronger inferential approach to hypothesis testing. Addressing the obstacles that have hindered progress will enable a more robust understanding of the relationships between ecological change and hominin evolution. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
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