Krapina, “Classic” Neanderthals,and the evolution of the European face

Except for the front end of the dental arch, tooth size remained at approximately the same level throughout the Middle Pleistocene. The Krapina Neanderthals at the end of the last interglacial differed from Homo erectus only in having larger front teeth. From that time on, tooth size in populations at the northern edge of the area of human occupation in the Old World has reduced approximately in proportion to the time elapsed. The “Classic” Neanderthals of western Europe, in fact, have teeth that are 15% smaller than those of the earlier Krapina Neanderthals and only 5% larger than the early Upper Palaeolithic. Reduction since the early Upper Palaeolithic has proceeded another full 20%. It is suggested that the development of heated stone cooking in the Mousterian, originally for the purpose of thawing frozen food, reduced the forces of selection that had previously maintained tooth size during the Middle Pleistocene. The operation of the Probable Mutation Effect, then produced the observed reductions.     

The skeletal correlates of behavioral modification in the laboratory mouse (Mus musculus)

The effects of behavioral modification on the skeletal morphology of the laboratory mouse (Mus musculus) are investigated. Climibing, with increrased prehensile use of the foot, is found to bring about significant changes in metatarsal and long bone morphology. Differences in metatarsal robusticity related to weight-bearing differences associated with different locomotor patterns are reported for a natural history setting for Peromyscus.     

Browridge structure and function in extant primates and Neanderthals

The structural characteristics of the supraorbital ridge in three extent primate species and fossil Neanderthals are described in this study. Surface morphology and patterns of trabecular organization as observed in cross-sectional collections of Papio, Macaca and Pan are compared with similar traits encountered in the Pech de l'Aze infant, Gibraltar child, and La Quina 5, La Chapelle-aux-Saints, Broken Hill, Skhul V, Skhul IX, Tabun I and Gibraltar adult Neanderthals. Periods of rapid appositional growth of the browridges by means of fine cancellous bone formation and its subsequent remodeling and consolidation are temporally correlated with dental development and eruption sequences.     

Phyletic diversity and locomotion in primitive European hominids.

A major contribution of previous analyses of Miocene hominoid postcrania is the recognition of a great ape grade of locomotor morphology in the late Miocene. However, in the absence of a consideration of the taxonomic and phylogenetic implications of the specimens concerned, the importance of this conclusion remains unappreciated. This paper presents a revised view of the positional implications of late Miocene hominid fossils and considers some of the taxonomic and phyletic implications of these specimens. The taxonomic status of a number of large catarrhine specimens from Europe (attributed to Dryopithecus, Sivapithecus, Austriacopithecus, Paidopithex, Rudapithecus) is discussed. The functional and phyletic significance of this material reveals a complex pattern of behavioral and phyletic diversity among large-bodied catarrhines in Europe and suggests that this diversity evolved in situ from circum-Mediterranean middle Miocene ancestors.     

What does geometric mean,mean geometrically? Assessing the utility of geometric mean and other size variables in studies of skull allometry

This study investigated the effects of using different size variables for interpretations of relative orbit size and mandibular robusticity. Thirty-three skull measurements taken on 385 platyrrhines representing 12 of 16 New World monkey genera (in addition to body mass and total body length) were used singly and in combinations (by taking the geometric mean of all measurements) as size variables to produce relative size indices of orbit area and mandibular thickness. These indices were then compared to investigate which size variables proved effective at differentiating nocturnal from diurnal taxa and hard object from soft object feeders based upon results from previous biomechanical studies. It was found that certain groups of size variables consistently produced the a priori expectations and resulted in lower coefficients of variation. The general principles shared by these size variables were that they sampled anatomically remote regions of the skull that appear to be functionally independent from the trait being evaluated and they were nearly always geometric mean combinations composed of a relatively high number (>or=12) of large measurements. Suggestions are also presented for amending these principles for use with incomplete material such as fossils.     

Stature and robusticity during the agricultural transition: Evidence from the bioarchaeological record

The population explosion that followed the Neolithic revolution was initially explained by improved health experiences for agriculturalists. However, empirical studies of societies shifting subsistence from foraging to primary food production have found evidence for deteriorating health from an increase in infectious and dental disease and a rise in nutritional deficiencies. In Paleopathology at the Origins of Agriculture (Cohen and Armelagos, 1984), this trend towards declining health was observed for 19 of 21 societies undergoing the agricultural transformation. The counterintuitive increase in nutritional diseases resulted from seasonal hunger, reliance on single crops deficient in essential nutrients, crop blights, social inequalities, and trade. In this study, we examined the evidence of stature reduction in studies since 1984 to evaluate if the trend towards decreased health after agricultural transitions remains. The trend towards a decrease in adult height and a general reduction of overall health during times of subsistence change remains valid, with the majority of studies finding stature to decline as the reliance on agriculture increased. The impact of agriculture, accompanied by increasing population density and a rise in infectious disease, was observed to decrease stature in populations from across the entire globe and regardless of the temporal period during which agriculture was adopted, including Europe, Africa, the Middle East, Asia, South America, and North America.     

Le Moustérien du Zagros : une vision synthétique à partir de la grotte de Shanidar

The Zagros Mousterian is a Middle Palaeolithic techno-typological lithic complex, found down the length of the Zagros mountain range in Iraq and Iran. It is associated with Neanderthal skeletal remains at four sites, most famously Shanidar Cave. Dating is problematic, but the indications are that Neanderthals with this cultural apparatus were present in the Zagros region from the beginning of the last interglacial (Marine Isotope Stage 5e) c.130.000 years ago through to c. 40.000 years ago during the last glacial. The humid deciduous woodland of MIS 5 was replaced by increasingly dry steppe in MIS 4 and MIS 3. Microfaunal assemblages and paleosols indicate that Neanderthals visited Shanidar Cave when environmental conditions were broadly similar to those of today, primarily in the humid phases of MIS 5 and then during brief climatic ameliorations in MIS 4 and MIS 3 that may correlate with Dansgaard-Oescheger events. Caves with Mousterian occupations at high altitudes suggest that they, too, were used by Neanderthals when conditions were not dissimilar to those of today. The indications are that the Zagros Mousterian represents the seasonal activities of highly mobile small and dispersed groups of Neanderthal foragers connected in social networks of shared cultural values and/or norms.     

Dental developmental pattern of the Neanderthal child from Roc de Marsal: a high-resolution 3D analysis

The assessment of the degree of similarity or difference between Neanderthals and modern humans in their patterns of dental development remains a controversial matter. Here we report results from the microtomographic-based (SR-μCT) high-resolution structural investigation of the maxilla and mandible of the Neanderthal child from Roc de Marsal, Dordogne, France (likely from OIS 5a). Following their virtual extraction and 3D rendering, we assessed the maturational stage of each of the 41 dental elements (20 deciduous and 21 permanent) forming its mixed dentition. By using a Bayesian approach, we calculated the probability that its deciduous and permanent mandibular sequences are found within the extant human variation as illustrated by a tomographic CT-based sub-sample of 32 children (deciduous dentition) and a panoramic radiographic- and CT-based whole sample of 343 living children (permanent dentition). Results show that neither the deciduous nor the permanent mandibular sequences displayed by Roc de Marsal are precisely found within our modern comparative files. In both sequences, the most influential factor is represented by a slight discrepancy in the Neanderthal child between the stage of mineralization of the first molar, which is proportionally advanced, and the maturational level reached by its incisors, which are proportionally delayed. Following a quantitative volumetric analysis of the deciduous teeth, we suggest that this characteristic may be related to differences between Neanderthals and modern humans in absolute dental size and relative size proportions between front and cheek teeth, as well as to structural differences in dental tissue proportions.