American Journal of Biological Anthropology最新文献

{"title":"Principal Components Analysis Fails to Recover Phylogenetic Structure in Hominins","authors":"Levi Y. Raskin,&nbsp;Maja Šešelj,&nbsp;Bárbara D. Bitarello,&nbsp;Sofia Stroustrup,&nbsp;Jacky K. Li,&nbsp;John Huelsenbeck","doi":"10.1002/ajpa.70306","DOIUrl":"10.1002/ajpa.70306","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>Paleoanthropologists often utilize geometric morphometrics and principal components analysis (PCA) to interpret shape variation within the hominin fossil record. It is common practice to interpret proximity in principal components (PC) space among taxa as indicative of not just morphological but also phylogenetic affinity. This interpretation, however, has not been directly evaluated for hominins.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>First, we inferred the posterior distribution of hominin phylogenetic trees and subsampled trees from this distribution. On these phylogenies, we simulated 2D and 3D geometric morphometric datasets and traditional morphological datasets, containing traits analogous to measurements of size or length, with varying numbers of landmarks or traits and evolutionary rates. On each dataset, we conducted a PCA and used neighbor-joining to infer evolutionary relationships from the PC scores of each taxon. We measured the difference between the PCA tree and sampled tree with subtree pruning and regrafting distance and Robinson-Foulds distance.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>PCA trees inferred from traditional morphometric data were identical to the sampled tree in 0.11% of datasets when we only considered PC axes 1 and 2, and in 2.9% of datasets when we considered all axes. No PCA tree inferred from any of the 2,400,000 shape datasets was identical to the sampled tree, regardless of the number of axes.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Discussion</h3>\u0000 \u0000 <p>Phylogenetic interpretations of the hominin fossil record based on proximity in PC space are inherently flawed and likely to be erroneous. Arguments in the hominin systematics literature based on PCA, whether implied or explicit, should therefore be reevaluated using phylogenetically informed alternatives.</p>\u0000 </section>\u0000 </div>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":"190 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148362388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Effect of Migration on Perceived Safety and Sleep Quality: An Analysis From Rural and Urban Indigenous Wixárika Communities in Jalisco, Mexico\u0000 El efecto de la migración en la seguridad percibida y la calidad del sueño: un análisis en comunidades indígenas Wixaritari rurales y urbanas en Jalisco, México","authors":"Leela McKinnon,&nbsp;Eric C. Shattuck,&nbsp;Igor Martín Ramos Herrera,&nbsp;René Cristobal Crocker Sagastume,&nbsp;Quetzabel de la Cruz,&nbsp;Paritemai González Torrez,&nbsp;Thankam Sunil,&nbsp;David R. Samson","doi":"10.1002/ajpa.70307","DOIUrl":"10.1002/ajpa.70307","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>This study explores how perceived safety influences sleep quality among Wixárika individuals in Mexico. We compared the sleep quality of those living in a rural town in northern Jalisco with those living in the Guadalajara Metropolitan Area (GMA). We aimed to assess differences in perceived safety, model its association with sleep outcomes, and test for gendered effects.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Sleep was measured using actigraphy and surveys. Perceived neighborhood safety (PNS) was measured with survey items. Sleep outcomes included efficiency, fragmentation, wake after sleep onset (WASO), self-rated quality, and daytime dysfunction. Analyses used Mann–Whitney <i>U</i> tests, linear mixed effects models, and logistic regression.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Our sample included 127 participants. In the rural location (<i>n</i> = 61), the mean age was 38.02 years (SD = 12.18, range = 18–65), with 72.13% comprised of women. In the GMA, the mean age was 29.59 years (SD = 8.43, range = 18–57), of whom 65.15% were women. PNS was significantly higher in the rural town than in the GMA. Gender moderated the association between PNS and sleep quality, with women showing improved sleep quality with greater PNS. Poorer mental health predicted lower sleep quality in rural participants and greater odds of daytime dysfunction in urban participants.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>In our analyses, living in urban contexts is associated with reduced perceived safety, which interacts with gender to shape sleep. Women's sleep appears to be particularly sensitive to perceived safety, reflecting broader intersecting vulnerabilities and health inequities faced by Indigenous migrant women. Policies addressing housing and neighborhood safety, alongside culturally grounded supports, may improve sleep health in these communities.</p>\u0000 </section>\u0000 </div>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":"190 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajpa.70307","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148362411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconsidering Whether Knuckle-Walking Gave Rise to Bipedalism in Light of the Extended Evolutionary Synthesis","authors":"Dean Falk","doi":"10.1002/ajpa.70301","DOIUrl":"10.1002/ajpa.70301","url":null,"abstract":"<div>\u0000 \u0000 <p>Paleoanthropologists debate whether the common ancestor of chimpanzees and humans moved terrestrially by knuckle-walking or in some other manner preadapted for bipedalism. The answer to this question would shed light on the emergence of one of the most definitive features of early hominins—habitual terrestrial bipedalism. Comparative morphological studies of apes, australopithecines, and modern humans, and investigations of the few putative earliest hominins have failed to resolve this issue. Here, the knuckle-walking question is approached by comparing the ontogenetic development of locomotor milestones in extant humans and chimpanzees in view of the extended evolutionary synthesis (EES), which extends the traditional modern synthesis' relatively narrow focus on natural selection and genetics by considering the plurality of factors that influence evolutionary processes, including development, organism-environment interactions, and epigenetics. Although the neuromuscular development of locomotor milestones is similar in chimpanzees and humans, chimpanzees do not crawl on their hands and knees, and human babies do not knuckle-walk. Palmigrade quadrupedalism briefly precedes development of knuckle-walking in chimpanzees. Converging data suggest that hands-and-knees crawling in hominin infants derived from a developmentally driven evolutionary transformation of chimpanzee-like palmigrade quadrupedalism in response to the progressive elongation of legs that accompanied selection for bipedalism. Modern human behaviors such as knocking on doors and boxing reinforce the hypothesis that hominins are, indeed, descended from knuckle-walkers.</p>\u0000 </div>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":"190 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148353516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Menopause Averted a Midlife Energetic Crisis With Help From Older Dependent Children and Parents: A Simulation Study","authors":"Edward H. Hagen","doi":"10.1002/ajpa.70295","DOIUrl":"https://doi.org/10.1002/ajpa.70295","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>The grandmother hypothesis proposes that ancestral women ceased reproduction midlife to instead provision their grandchildren. An alternative “two-sex” account proposes that the high energetic burden of caring for slow-developing offspring was met with biparental investment. Menopause evolved because the physiological costs of reproduction increased with age, yet productivity also increased with age, and the benefits of resource transfers by parents and grandparents of both sexes to adult children and their offspring eventually outweighed the diminishing benefits of continued reproduction. The “father absent” hypothesis proposes that the higher mortality rate of husbands would often have left wives without the resources to raise young children, selecting for early reproductive cessation. Juvenile production plays little role in the three hypotheses, yet subsequent studies have found it to be surprisingly high.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>Simulations were conducted of hunter-gatherer energy consumption and production across the lifespan, taking account of age- and sex-specific survivorship, interbirth intervals, and varying rates of foraging skill acquisition typical of contemporary foragers.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>There is a pronounced midlife energy deficit that could be averted with the increasing production of maturing juveniles; midlife cessation of reproduction, which limited the number of mouths to feed; and energy transfers from older parents, and sometimes younger couples (e.g., brideservice).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Discussion</h3>\u0000 \u0000 <p>Menopause emerges as an integral and necessary component of the unique human pattern of relatively short interbirth intervals, a long period of juvenile dependency, and extensive food sharing, supporting and extending the “two sex” and grandmother hypotheses.</p>\u0000 </section>\u0000 </div>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":"190 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajpa.70295","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148343325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cover & Editorial Board","authors":"","doi":"10.1002/ajpa.70273","DOIUrl":"https://doi.org/10.1002/ajpa.70273","url":null,"abstract":"","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":"190 3","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajpa.70273","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148343319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Winthir Collection: An Identified Historical Skeletal Series From Munich, Germany","authors":"Ja Young Lee,&nbsp;Barbara Schratzenstaller,&nbsp;Elsa Seyr,&nbsp;Maren Velte,&nbsp;Kristin von Heyking,&nbsp;Bernd Trautmann,&nbsp;Eva Kropf,&nbsp;Jochen Haberstroh,&nbsp;Albert Zink,&nbsp;Christof Paulus,&nbsp;Michaela Harbeck","doi":"10.1002/ajpa.70302","DOIUrl":"https://doi.org/10.1002/ajpa.70302","url":null,"abstract":"<p>Documented skeletal collections that can be linked to individual life-history information remain critical resources for bioarchaeological research, yet nonmodern identified series are still rare in Central Europe. We present the Winthir Collection, a late-19th-century skeletal assemblage from Munich, Germany, comprising 245 identified individuals recovered from an abandoned cemetery extension.</p><p>Individual attribution was achieved through the integration of osteological analysis with grave registry data and archival sources. For most individuals, reconstructed profiles include age at death, place of birth, family relations, marital status, occupation, and recorded cause of death, allowing skeletal observations to be interpreted within a documented biographical framework.</p><p>The assemblage contains a substantial number of non-adults (<i>n</i> = 90), markedly expanding the limited pool of identified non-adult remains available for the region. Preservation is generally good, and skeletal evidence of medical intervention—including cranial procedures consistent with autopsy—can be evaluated alongside documentary information. Curated at the State Collection for Anthropology Munich, the Winthir Collection offers a rare opportunity to examine osteological variation within a historically documented population and provides an important reference dataset for future methodological work, particularly in the study of non-adult remains.</p>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":"190 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajpa.70302","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148324664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rib Cross-Sectional Mineralized Area in Early Pleistocene Hominins: Insights From the Homo antecessor and H. erectus s. l. Fossil Record","authors":"J. M. López-Rey,&nbsp;D. García-Martínez,&nbsp;A. Gómez-Olivencia,&nbsp;O. Cambra-Moo,&nbsp;A. González-Martín,&nbsp;M. Bastir,&nbsp;J. M. Bermúdez de Castro","doi":"10.1002/ajpa.70299","DOIUrl":"10.1002/ajpa.70299","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>Rib cross-sectional mineralized area provides valuable insights into mechanical loading and bone growth and remodeling. Given the scarcity of Early Pleistocene costal remains in the context of human evolution, we aimed to study the cross-sectional anatomy of fossil ribs from that period and compare them to a modern human ontogenetic series ranging from 8 to over 30 years of age.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>We extracted the rib cross section at the midshaft of 6 fossil ribs attributed to several H. antecessor individuals and 10 fossil ribs of the <i>H. erectus</i> s. l. specimen KNM-WT 15000. Then we compared their relative mineralized area with that of the full, unilateral costal series of 27 <i>H. sapiens</i> individuals spanning different ontogenetic stages (pre-pubescent, post-pubescent, adult).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Our findings indicate that rib cross-sectional mineralized area of H. antecessor is close to that of subadult <i>H. sapiens</i>, sharing a similar U-shaped trend along the costal series. Values are considerably lower compared to KNM-WT 15000, which shows a higher mineralized area at the middle thoracic rib levels rather than at the extremes.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Discussion</h3>\u0000 \u0000 <p>Despite possible taphonomic alteration of fossil ribs, these results suggest a different, possibly derived pattern of rib cross-sectional mineralized area in H. antecessor compared to more primitive Early Pleistocene hominins. However, considering the earlier ontogenetic stage of KNM-WT 15000, we cannot discard that ribs of H. antecessor belong to individuals exhibiting a postcranial growth pattern similar to that of <i>H. erectus</i> s. l., but at a more advanced phase in development.</p>\u0000 </section>\u0000 </div>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":"190 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajpa.70299","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148309665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biopower, Necropolitics, and the Afterlives of Infants: Uncovering the Ethics of Historical Anatomical Collections","authors":"Siân E. Halcrow,&nbsp;Rebecca L. Gowland,&nbsp;Stephie R. Lončar,&nbsp;Jamie Metzger,&nbsp;Claire Cameron","doi":"10.1002/ajpa.70294","DOIUrl":"10.1002/ajpa.70294","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>In the 19th and early 20th centuries, many fetuses and infants were collected for anatomical study. Yet little research has explored their origins or the ethical implications of holding and using these individuals in teaching and research.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>This paper reviews the literature on fetal and infant skeletal collections and presents a case study from the W. D. Trotter Anatomy Museum in Aotearoa New Zealand that uses the lens of biopower and necropolitics to examine the acquisition and use of these individuals in anatomical education. This model highlights how societal and institutional powers and medicine regulate reproductive bodies and determine the perceived worth of fetuses and infants within specific cultural, historical, and medical contexts.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>This case study shows that individuals were often acquired from marginalized populations—unwed parents, the impoverished, and institutionalized women—whose reproductive autonomy was politically and socially negated. The paper explores how biopower and the necropolitics of reproduction in colonial New Zealand operated to control populations and individuals.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Discussion</h3>\u0000 \u0000 <p>Biopower and the necropolitics of reproduction were enacted through eugenic sentiment, structural inequality in healthcare, alongside medical and institutional control over the living and the dead. This contributed to higher infant mortality for marginalized mothers and infants, a loss of autonomy over the fate of deceased bodies, and the suppression of grief. The anatomization of fetuses rendered them objects of scientific value, whilst simultaneously erasing their personhood and socio-historical context, thus extending the structural violence their families experienced during life into their postmortem “life” history (necro-violence).</p>\u0000 </section>\u0000 </div>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":"190 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajpa.70294","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148309687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigating Associations Between Developmental Integration and Physiological Stress","authors":"B. R. Wigley,&nbsp;P. G. Blackwell","doi":"10.1002/ajpa.70297","DOIUrl":"10.1002/ajpa.70297","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> \u0000 Objectives\u0000 </h3>\u0000 \u0000 <p>Integration, or patterns of correlation between structural elements, is of interest in diverse fields. Analysis is, however, generally limited to group-level comparisons. This paper presents a novel combination of methods to quantify developmental integration (i.e., patterns of covariation which arise during growth) so that a univariate score is computed, summarizing individual integration in contrast to group-level trends. This provides a means of investigating factors which influence variation in multi-scale detail.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>Human ossa coxae from archaeological remains were assessed. After capturing os coxae shape through geometric morphometric methods, patterns of integration between modules—that is, the ilium, ischium and pubis—were summarized via individual scores calculated through a Leave-One-Out (LOO) approach. Osteological assessments allowed integration to be explored in relation to demographic factors and physiological stress experience during development as implied through chronologically matched linear enamel hypoplasia (LEH).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>While skeletal sex and site of origin influenced gross os coxae shape, variation in integration appeared to be related to stress experienced during development, with individuals exhibiting matched LEH having significantly lower integration scores.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Discussion</h3>\u0000 \u0000 <p>It is possible that developmental stress is associated with decreased integrated skeletal growth and, while gross shape is unaffected, the traces of this disruption can be detected through the method presented here. While analyses implied that this hypothesis must be treated cautiously, it is proposed that quantifications of integration in skeletal materials can potentially be employed to investigate developmental stress experience. Further work is needed to validate these assumptions.</p>\u0000 </section>\u0000 </div>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":"190 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajpa.70297","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148309719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correspondence Among Locomotor Profiles, Daily Stride Cycles, and Femoral Bone Robusticity in Taï Forest Cercopithecids","authors":"David J. Daegling,&nbsp;Jordan N. Traff,&nbsp;Tessa H. C. Wilde,&nbsp;E. Anderson Bitty,&nbsp;W. Scott McGraw","doi":"10.1002/ajpa.70296","DOIUrl":"10.1002/ajpa.70296","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objectives</h3>\u0000 \u0000 <p>This study explores linkages between daily locomotor cycles to structural and material biomechanical variables in four sympatric West African cercopithecid species. While functional studies of primate postcrania typically rely on locomotor and activity profiles to create a context for biomechanical interpretation, two variables not typically included in such studies are stride counts and rest intervals. The former provide information on cumulative daily loads, while the latter have been shown to have positive osteogenic effects.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>Daily stride cycle counts in four adult females representing four sympatric cercopithecid species were collected over 30-day periods. Individuals of the western red colobus (<i>Piliocolobus badius</i>), black and white (king or pied) colobus (<i>Colobus polykomos</i>), Diana monkey (<i>Cercopithecus diana</i>), and sooty mangabey (<i>Cercocebus atys</i>) were followed in the Taï Forest, Côte d'Ivoire. We also recruited existing data on activity patterns to provide a qualitative assessment of the amount of daily rest among these species. We utilized existing data on femoral mechanical properties from individuals within these populations to discern whether the number of daily locomotor cycles corresponded with indices of bone robusticity.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Differences in daily stride counts distinguish the four individuals, with higher stride counts characterizing the representatives of the two cercopithecine species. We do not observe a correspondence between stride counts and measures of long bone robusticity. Cumulative daily loads do not correspond to stronger or denser bones.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Discussion</h3>\u0000 \u0000 <p>The inclusion of information on rest duration and spacing may clarify functional linkages between locomotor behavior and skeletal mechanical properties.</p>\u0000 </section>\u0000 </div>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":"190 2","pages":""},"PeriodicalIF":2.4,"publicationDate":"2026-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148296454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}