American Journal of Biological Anthropology最新文献

{"title":"Technical note: Measuring bicondylar length in computed tomography data.","authors":"Kelly R Kamnikar, Nicollette S Appel, Rachel Menegaz, Tea Jashashvili, Ethan C Hill, Heather J H Edgar","doi":"10.1002/ajpa.25032","DOIUrl":"https://doi.org/10.1002/ajpa.25032","url":null,"abstract":"<p><strong>Objectives: </strong>With the increased use of 3D-generated images in biological research, there is a critical need to adapt classical anatomical measurements, traditionally conducted with calipers, to a virtual environment. We present detailed protocols for measuring bicondylar length, a critical dimension of the femur, using three different imaging software programs-3D Slicer™, Amira™, and Simpleware™. These protocols provide researchers and practitioners in radiology, orthopedics, biomechanics, and biological anthropology with accurate and reproducible measurement techniques. The objective is to standardize and support virtual osteology in biomechanical research, stature estimation, and related medical and anthropological studies.</p><p><strong>Materials and methods: </strong>Adhering to standardized protocols, we adapted femoral bicondylar length measurements for computed tomography images from a New Mexican collection (n = 10). The method was designed for applicability and reproducibility across three software platforms. By comparing measurements from the same sample across different observers and different platforms, this study validates the accuracy and consistency of the adapted protocol, demonstrating its utility for research and clinical assessments.</p><p><strong>Results: </strong>We present a step-by-step guide for each program, detailing bone alignment and measurement. We illustrate each step and provide video tutorials via links for an enhanced understanding of the process.</p><p><strong>Discussion: </strong>Bicondylar length can be measured effectively in each software program following the provided instructions. However, ease of measurement varied among the programs, with some offering a more straightforward process. This variability underscores the importance of choosing appropriate software for the user's needs and proficiency. It also suggests areas for improvement and standardization in software design and instructional clarity.</p>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142381773","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":"Temporal lobe evolution in Hominidae and the origin of human lobe proportions.","authors":"Alannah Pearson, P David Polly","doi":"10.1002/ajpa.25027","DOIUrl":"https://doi.org/10.1002/ajpa.25027","url":null,"abstract":"<p><p>Objectives Evolutionary changes in hominin social complexity have been associated with increases in absolute brain size. The temporal lobes are nestled in the middle cranial fossae (MCF) of the skull, the dimensions of which allow estimation of temporal lobe volume (TLV) in extant and fossil taxa. Materials and Methods The main aim of this study is to determine where along the hominid phylogeny, major temporal lobe size transitions occurred. We used computed tomography (CT) scans of crania, 3D photogrammetry data, and laser surface scans of endocranial casts to measure seven MCF metrics in 11 extant anthropoid taxa using multiple regressions to estimate TLV in 5 extant hominids and 10 fossil hominins. Phylogenetic comparative methods mapped temporal lobe size, brain size, and temporal lobe proportions onto phylogenetic trees broadly for Hominidae and specifically for Hominini. Results Extant Homo sapiens were not an outlier in relative brain size, temporal lobe size, or proportions of the temporal lobes, but some proportions within the lobe were uniquely altered. The most notable changes in relative temporal lobe size and proportions saw a decrease in relative temporal lobe size and proportions in the genus Pan compared to other extant great apes and fossil hominins while there was a relative increase in the temporal lobe width and length in Australopithecus-Paranthropus clade compared to the genus Homo and other extant great apes including modern humans. Discussion We do not find support for the social brain, environmental or functional craniology hypotheses alone but think it prudent to consider the implications of cerebral reorganization between the temporal lobes and other regions of the brain within the context of these hypotheses and with future investigation is warranted.</p>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142366763","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":"Costs and benefits of allomaternal care to mothers and others in wild Phayre's leaf monkeys.","authors":"Samantha Vee, Carola Borries, Eileen Larney, Andreas Koenig","doi":"10.1002/ajpa.25035","DOIUrl":"10.1002/ajpa.25035","url":null,"abstract":"<p><strong>Objectives: </strong>Allomaternal care (AMC) is suggested to be energetically beneficial to mothers and costly to allomothers. However, among primates, AMC is a heterogeneous phenomenon and its implications are less clear especially in female dispersal species. Here, we investigated infant care in a female dispersal species, Phayre's leaf monkeys (Trachypithecus phayrei crepusculus), to evaluate whether mothers were constrained by infant care and benefitted energetically from AMC, whether AMC was energetically costly for allomothers and how maternal experience was associated with AMC.</p><p><strong>Materials and methods: </strong>Data were collected via instantaneous focal animal sampling between 2004 and 2005 for juvenile and adult females (N = 18) from two groups at the Phu Khieo Wildlife Sanctuary, Thailand (440 h). We used generalized linear mixed models to determine how infant care during the first month after birth affected the time mothers and allomothers spent feeding, socializing, resting, and locomoting and how AMC varied.</p><p><strong>Results: </strong>In the first month, infants spent 26% of their time with an allomother. We found no differences in mothers' overall activity before versus after birth, although mothers fed significantly more and rested less when without their infant. Allomothers fed and rested less when with an infant. AMC varied between 0.0% and 20.5%, with immature females being most active.</p><p><strong>Discussion: </strong>Mothers appear to benefit energetically from AMC such that their overall activity after birth remained unchanged. Costs and benefits for allomothers seem to be variable. Some very active immature females may be benefitting from learning-to-mother. The overall low cost of AMC may facilitate a reciprocal social network among unrelated females.</p>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142355420","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":"Genetic ancestry in Puerto Rican afro-descendants illustrates diverse histories of African diasporic populations.","authors":"Maria A Nieves-Colón, Emma C Ulrich, Lijuan Chen, Gabriel A Torres Colón, Maricruz Rivera Clemente, La Corporación Piñones Se Integra Copi, Jada Benn Torres","doi":"10.1002/ajpa.25029","DOIUrl":"https://doi.org/10.1002/ajpa.25029","url":null,"abstract":"<p><strong>Objectives: </strong>Genetic studies of contemporary Puerto Ricans reflect a demographic history characterized by admixture between Indigenous American, African, and European peoples. While previous studies provide genetic perspectives on the general Puerto Rican population, less is known about the island's sub-populations, specifically Afro-Puerto Ricans.</p><p><strong>Materials and methods: </strong>In this study, the genetic ancestry of Afro-Puerto Ricans is characterized and compared to other Caribbean populations. Thirty DNA samples collected among self-identified Puerto Ricans of African descent in Loíza (n = 2), Piñones (n = 13), San Juan (n = 2), Mayagüez (n = 9), and Ponce (n = 4), were genotyped at 750,000 loci on the National Geographic Genochip. We then applied unsupervised clustering and dimensionality-reduction methods to detect continental and subcontinental African and European genetic ancestry patterns.</p><p><strong>Results: </strong>Admixture analyses reveal that on average, the largest genetic ancestry component for Afro-Puerto Ricans is African in origin, followed by European and Indigenous American genetic ancestry components. African biogeographic origins of Afro-Puerto Ricans align most closely with contemporary peoples of Lower Guinea and the Bight of Biafra, while the European genetic ancestry component is most similar to contemporary Iberian, Italian, and Basque populations. These findings contrast with the biogeographic origins of comparative Barbadian and Puerto Rican populations.</p><p><strong>Discussion: </strong>Our results suggest that while there are similarities with regard to general patterns of genetic ancestry among African descendants in the Caribbean, there is previously unrecognized regional heterogeneity, including among Puerto Rican sub-populations. These results are also consistent with available historical sources, while providing depth absent from the documentary record, particularly with regard to African ancestry.</p>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142297006","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":"Pongo's ecological diversity from dental macrowear analysis.","authors":"Luca Fiorenza, D Rex Mitchell, Ottmar Kullmer","doi":"10.1002/ajpa.25031","DOIUrl":"https://doi.org/10.1002/ajpa.25031","url":null,"abstract":"<p><strong>Objectives: </strong>Orangutans are found in tropical rainforests of Borneo (Pongo pygmaeus) and Sumatra (Pongo abelii and Pongo tapanuliensis), and they are primarily considered frugivorous species. However, ecological studies reported differences in feeding behavior between these species. P. pygmaeus spend more time feeding on low-quality foods, such as bark and tough vegetation than do P. abelii. The aim of this study is to investigate if there is any geographic variation in molar macrowear pattern between the two species.</p><p><strong>Methods: </strong>We analyzed the macrowear pattern of second mandibular molars of 58 orangutan specimens combining dental topographic measurements (occlusal relief index, percentage of dentine exposure, and percentage of enamel wear) with the occlusal fingerprint analysis method.</p><p><strong>Results: </strong>The molar macrowear patterns of P. abelii and P. pygmaeus show no significant differences in most of the variables examined in this study. While P. pygmaeus molars are generally characterized by flatter occlusal morphology with slightly larger crushing and grinding areas than those of P. abelii, these differences are not statistically significant. However, we do observe a more variable wear in P. pygmaeus.</p><p><strong>Conclusions: </strong>Similarities in molar macrowear patterns between the two species could be linked to overlapping long-term diets, primarily composed of ripe and pulpy fruits. Dental macrowear is a cumulative process that occurs during the individual's lifetime, and it may be difficult to detect seasonal changes through its examination. Future studies could integrate tooth micro- and macrowear data for a better understanding of primate dental ecology.</p>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142297017","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":"Cover & Editorial Board","authors":"","doi":"10.1002/ajpa.24779","DOIUrl":"https://doi.org/10.1002/ajpa.24779","url":null,"abstract":"","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajpa.24779","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272997","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 intersectional effects of sex and socioeconomic status on risk of mortality in industrializing England.","authors":"Samantha L Yaussy","doi":"10.1002/ajpa.25022","DOIUrl":"https://doi.org/10.1002/ajpa.25022","url":null,"abstract":"<p><strong>Objectives: </strong>Intersectionality posits that multiple levels of marginalization interact to produce patterns of frailty and mortality, both today and in the past. To investigate how mortality during industrialization was selective with respect to sex and socioeconomic status (SES), this study analyzes data from four burial grounds dated to the 18th-19th centuries in England: St. Bride's Fleet Street, Coach Lane, St. Peter's Collegiate Church, and New Bunhill Fields.</p><p><strong>Materials and methods: </strong>St. Bride's was considered the high SES group, and Coach Lane, St. Peter's, and New Bunhill Fields were separately and collectively analyzed as the low SES groups. Sex (in individuals aged 18+ years) was modeled as a covariate affecting the Gompertz model of mortality, and SES (in individuals for whom age could be estimated) was modeled as a covariate affecting the Siler and Gompertz models of mortality.</p><p><strong>Results: </strong>The results indicate that sex influenced risk of mortality among adults in the high SES group. High SES males faced lower risks of death compared to high SES females. The results also suggest that SES influenced risk of mortality across all ages. High SES individuals were at reduced risks of death compared to low SES individuals.</p><p><strong>Conclusions: </strong>Increased mortality risks among individuals of low SES was likely due to the low standards of living common in the impoverished areas of cities in industrializing England. However, in accordance with intersectionality, the benefits of high status were unequally distributed among adults in the high SES group, suggesting that men were the primary beneficiaries of the protective aspects of high SES.</p>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142156159","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":"Dying of pestilence: Stature and mortality from the Black Death in 14th-century Kyrgyzstan.","authors":"David W Hansen, Sharon N DeWitte, Philip Slavin","doi":"10.1002/ajpa.25009","DOIUrl":"https://doi.org/10.1002/ajpa.25009","url":null,"abstract":"<p><strong>Objectives: </strong>Bioarchaeological studies have provided important information about mortality patterns during the second pandemic of plague, including the Black Death, but most to date have focused on European contexts. This study represents a spatial contribution to plague bioarchaeology, focusing on Central Asia, the origin of the second pandemic. We examine the relationship between stature and plague mortality during an outbreak of plague at Kara-Djigach in northern Kyrgyzstan in 1338-1339, the earliest archaeological site known to contain victims of the Black Death in Eurasia.</p><p><strong>Methods: </strong>This study uses epigraphic data and in situ measurements from the Syriac Christian cemeteries at Kara-Djigach, obtained from field notes from excavations conducted by Russian archaeologists in the 1880s (n = 34 individuals). The epigraphic data provide detailed information about the interred individuals, including occupations, year of death, and gender. In situ measurements provide data on adult stature. This study uses chi-square and Fisher's exact tests to examine relationships between stature and plague at the site.</p><p><strong>Results: </strong>We find evidence that relatively short people were disproportionately affected by plague when compared with non-plague years.</p><p><strong>Discussion: </strong>These results might reflect increased mortality risks from plague based on exposure to early life biological stress events.</p>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142141269","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":"Technical note: Does scan resolution or downsampling impact the analysis of trabecular bone architecture?","authors":"Andrea Lukova, Christopher J Dunmore, Zewdi J Tsegai, Sebastian Bachmann, Alexander Synek, Matthew M Skinner","doi":"10.1002/ajpa.25023","DOIUrl":"https://doi.org/10.1002/ajpa.25023","url":null,"abstract":"<p><p>The \"gold standard\" for the assessment of trabecular bone structure is high-resolution micro-CT. In this technical note, we test the influence of initial scan resolution and post hoc downsampling on the quantitative and qualitative analysis of trabecular bone in a Gorilla tibia. We analyzed trabecular morphology in the right distal tibia of one Gorilla gorilla individual to investigate the impact of variation in voxel size on measured trabecular variables. For each version of the micro-CT volume, trabecular bone was segmented using the medical image analysis method. Holistic morphometric analysis was then used to analyze bone volume (BV/TV), anisotropy (DA), trabecular thickness (Tb.Th), spacing (Tb.Sp), and number (Tb.N). Increasing voxel size during initial scanning was found to have a strong impact on DA and Tb.Th measures, while BV/TV, Tb.Sp, and Tb.N were found to be less sensitive to variations in initial scan resolution. All tested parameters were not substantially influenced by downsampling up to 90 μm resolution. Color maps of BV/TV and DA also retained their distribution up to 90 μm. This study is the first to examine the effect of variation in micro-CT voxel size on the analysis of trabecular bone structure using whole epiphysis approaches. Our results indicate that microstructural variables may be measured for most trabecular parameters up to a voxel size of 90 μm for both scan and downsampled resolutions. Moreover, if only BV/TV, Tb.Sp or Tb.N is measured, even larger voxel sizes might be used without substantially affecting the results.</p>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142141270","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":"Evolutionary selection and morphological integration in the hand of modern humans.","authors":"Mikel Arlegi, Carlos Lorenzo","doi":"10.1002/ajpa.25024","DOIUrl":"https://doi.org/10.1002/ajpa.25024","url":null,"abstract":"<p><strong>Objectives: </strong>To enhance our understanding of the evolutionary dynamics of the modern human hand by analyzing the degree of integration and ability to respond to selection pressures of each phalanx and metacarpal bone.</p><p><strong>Materials and methods: </strong>The sample comprised 96 adult individuals, both female and male, from Euro-American, Afro-American, and European populations. We collected 10 linear measurements from the 19 metacarpals and proximal, middle, and distal phalanges that constitute the five digits of the hand. Using these data, we constructed variance/covariance matrices to quantify the degree of integration and assess the hand ability to respond to selective pressures.</p><p><strong>Results: </strong>Distal phalanges are the most evolvable and flexible elements, while being the least integrated and constrained. The thumb is similarly integrated as the second and third rays, while medial rays (fourth and fifth digits) are more integrated. However, the thumb presents different integration and response to selection patterns. No significant relationship was found between functionality and the indices of selection and integration. Finally, the correlation between hand and foot indices yielded significant results for conditional evolvability and flexibility.</p><p><strong>Discussion: </strong>The findings suggest different evolutionary trajectories for the metacarpal and distal phalanx in the modern human thumb, likely reflecting varying functional and developmental pressures. The first metacarpal, characterized by high flexibility and low evolvability, appears to have reached a stable, optimal morphology, under stabilizing selection. In contrast, the distal phalanx seems to have undergone directional evolution, suggesting specialization for a specific function. Comparisons between hands and feet suggest that these structures evolve differently under directional selection but similarly under stabilizing selection.</p>","PeriodicalId":29759,"journal":{"name":"American Journal of Biological Anthropology","volume":null,"pages":null},"PeriodicalIF":1.7,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142126861","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}