Hidayah Haris, Nursyuhada Othman, Munian Kaviarasu, Muhammad Faudzir Najmuddin, Nurfatiha Akmal Fawwazah Abdullah-Fauzi, Farah Farhana Ramli, Nur Hartini Sariyati, Mohd Lokman Ilham-Norhakim, Badrul Munir Md-Zain, Muhammad Abu Bakar Abdul-Latiff
{"title":"Ethnoprimatology reveals new extended distribution of critically endangered banded langur Presbytis femoralis (Martin, 1838) in Pahang, Malaysia: Insights from indigenous traditional knowledge and molecular analysis","authors":"Hidayah Haris, Nursyuhada Othman, Munian Kaviarasu, Muhammad Faudzir Najmuddin, Nurfatiha Akmal Fawwazah Abdullah-Fauzi, Farah Farhana Ramli, Nur Hartini Sariyati, Mohd Lokman Ilham-Norhakim, Badrul Munir Md-Zain, Muhammad Abu Bakar Abdul-Latiff","doi":"10.1002/ajp.23631","DOIUrl":"10.1002/ajp.23631","url":null,"abstract":"<p>The banded langur (Presbytis femoralis) is a critically endangered primate, which within Malaysia has not been known to extend significantly outside the state of Johor. Traditionally, distribution studies on this highly threatened primate have relied on conventional methods such as DNA identification, live counting, and camera trapping. However, ethnoprimatology offers an alternative approach to data collection, involving the active participation of indigenous and local communities possessing valuable knowledge and experience with local primate species. This study employed an integrated approach incorporating ethnoprimatology by utilizing pooled local expert opinion, local surveys, interviews, and fecal DNA analysis, resulting in a novel distribution range for the banded langur. The combination of expert opinions revealed this species' most optimistic distribution scenario across Johor and Pahang, inhabiting various ecosystems, including lowland forests, peat swamps, and human-modified landscapes. Further interviews and surveys conducted within the Orang Asli community in Tasik Chini and Tasek Bera have provided additional support for the revised distribution, documenting occurrences of banded langur utilization in indigenous practices, such as food consumption, cultural beliefs, medicinal applications, and craftsmanship. Phylogenetic analysis demonstrated genetic differentiation between populations in Johor and Pahang, with the populations in the southern part of Peninsular Malaysia likely serving as ancestral sources for other populations. Consequently, this study not only elucidated the updated distribution of banded langur through DNA records and direct observations but also established the efficacy of ethnoprimatology as a precursory tool for uncovering the present distribution patterns of other primate species in Malaysia.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140837559","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alexandria E. Cosby, Andriatsitohaina Bertrand, Archie Raquel, Jules Cora, Keriann C. McGoogan, Persram Maya, Razafitsalama Mamy, Young Arayelle, Travis S. Steffens
{"title":"Primate conservation: A public issue?","authors":"Alexandria E. Cosby, Andriatsitohaina Bertrand, Archie Raquel, Jules Cora, Keriann C. McGoogan, Persram Maya, Razafitsalama Mamy, Young Arayelle, Travis S. Steffens","doi":"10.1002/ajp.23632","DOIUrl":"https://doi.org/10.1002/ajp.23632","url":null,"abstract":"Nonhuman primates (primates) are one of the most endangered mammalian taxa in the world. In the Global North, primates are considered exotic species and, as such, humans' impact on primate conservation and responsibility to protect primates is often ignored. This view differs from the spectrum of relations and attitudes of humans that live in connection to primates, which can include viewing these animals as culturally/religiously significant, cohabitors of forests, nuisances, or sources of protein. While conservationists argue that primates deserve our protection, the conservation crisis facing primates is rarely framed as a public issue, in contrast to other global crises, such as climate change. However, over half of the world's human population lives within 100 km of primate habitat. Thus, humans and primates share the same environments. We suggest leveraging a holistic approach, such as One Health, that considers the interconnectedness of primates, humans, and their shared environments, through the lens of public anthropology. By approaching primate conservation as an intersectional issue that affects and is affected by humans, researchers and conservationists can identify strategies that simultaneously protect primates and address global inequities that frequently affect people in primate range countries. Reflexive research practices further allow academics to consider the broader impact of their ecological research through means such as publicly accessible dissemination of results, equitable capacity-building of high-quality personnel in primate range countries, and social activism. The use of inter-, multi-, and transdisciplinary concepts and methodology can address the intersectional challenges associated with implementing ethical and sustainable primate conservation measures.","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140652962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shelley A. Cole, Martha M. Lyke, Clinton Christensen, Deborah Newman, Alec Bagwell, Samuel Galindo, Jeremy Glenn, Donna G. Layne-Colon, Ken Sayers, Suzette Tardif, Laura A. Cox, Corinna Ross, Ian H. Cheeseman
{"title":"Genetic characterization of a captive marmoset (Callithrix jacchus) colony using genotype-by-sequencing","authors":"Shelley A. Cole, Martha M. Lyke, Clinton Christensen, Deborah Newman, Alec Bagwell, Samuel Galindo, Jeremy Glenn, Donna G. Layne-Colon, Ken Sayers, Suzette Tardif, Laura A. Cox, Corinna Ross, Ian H. Cheeseman","doi":"10.1002/ajp.23630","DOIUrl":"10.1002/ajp.23630","url":null,"abstract":"<p>The marmoset is a fundamental nonhuman primate model for the study of aging, neurobiology, and many other topics. Genetic management of captive marmoset colonies is complicated by frequent chimerism in the blood and other tissues, a lack of tools to enable cost-effective, genome-wide interrogation of variation, and historic mergers and migrations of animals between colonies. We implemented genotype-by-sequencing (GBS) of hair follicle derived DNA (a minimally chimeric DNA source) of 82 marmosets housed at the Southwest National Primate Research Center (SNPRC). Our primary goals were the genetic characterization of our marmoset population for pedigree verification and colony management and to inform the scientific community of the functional genetic makeup of this valuable resource. We used the GBS data to reconstruct the genetic legacy of recent mergers between colonies, to identify genetically related animals whose relationships were previously unknown due to incomplete pedigree information, and to show that animals in the SNPRC colony appear to exhibit low levels of inbreeding. Of the >99,000 single-nucleotide variants (SNVs) that we characterized, >9800 are located within gene regions known to harbor pathogenic variants of clinical significance in humans. Overall, we show the combination of low-resolution (sparse) genotyping using hair follicle DNA is a powerful strategy for the genetic management of captive marmoset colonies and for identifying potential SNVs for the development of biomedical research models.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140662272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Allyson G King, Tianna C. Rissling, Susanne Cote, Pascale Sicotte
{"title":"All together now: Assessing variation in maternal and nonmaternal handling of wild Colobus vellerosus infants.","authors":"Allyson G King, Tianna C. Rissling, Susanne Cote, Pascale Sicotte","doi":"10.1002/ajp.23629","DOIUrl":"https://doi.org/10.1002/ajp.23629","url":null,"abstract":"Primatologists have a long-standing interest in the study of maternal care and nonmaternal handling (NH) of infants stemming from recognition that early social relationships can have enduring consequences. Though maternal care and NH often include expression of similar behaviors, they are regularly studied in isolation from each other with nonoverlapping terminology, thereby overlooking possible interplay between them and obfuscating potential developmental ramifications that ensue from trade-offs made between maternal (MH) and NH during infancy. To that end, identifying how MH and NH patterns interact and contribute to the total handling (TH) infants receive is a critical first step. We present durational handling data collected from 25 wild Colobus vellerosus infants from 2016 to 2017 and assess the relationships between TH, MH, and NH. Patterns of social affiliation are shaped in part by surrounding context, and therefore, we also assess whether NH and TH differ in their responsivity to various infant and social group characteristics. Ninety-four percent of observed handling was MH, while just 5.5% was NH. Young infants who received more MH (excluding nursing) also received more NH; there was no relationship between the two in older infants. Infants in larger groups participated in more handling of all types. Additionally, NH time was associated with infant sex and group stability. Non-nursing TH time was associated with group stability and infant cohort size. Though NH variation likely confers social-networking advantage, in this population NH is not a major contributor to TH and would not effectively replace reduced MH. The positive association between MH and NH during early infancy suggests that colobus mothers may play a mediating role in shaping infant socialization. This is a first step in elucidating how different forms of handling relate to one another in wild primates and in identifying the impact of handling on infant socialization.","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140669815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jacob B. Kraus, Zhi-Pang Huang, Yan-Pang Li, Liang-Wei Cui, Shuang-Jin Wang, Jin-Fa Li, Feng Liu, Yun Wang, Karen B. Strier, Wen Xiao
{"title":"Variation in monthly and seasonal elevation use impacts behavioral and dietary flexibility in Rhinopithecus bieti","authors":"Jacob B. Kraus, Zhi-Pang Huang, Yan-Pang Li, Liang-Wei Cui, Shuang-Jin Wang, Jin-Fa Li, Feng Liu, Yun Wang, Karen B. Strier, Wen Xiao","doi":"10.1002/ajp.23627","DOIUrl":"10.1002/ajp.23627","url":null,"abstract":"<p>Black-and-white snub-nosed monkeys (<i>Rhinopithecus bieti</i>) rely on behavioral and dietary flexibility to survive in temperate latitudes at high-elevation habitats characterized by climate and resource seasonality. However, little is known about how elevation influences their behavioral and dietary flexibility at monthly or seasonal scales. We studied an isolated <i>R. bieti</i> population at Mt. Lasha in the Yunling Provincial Nature Reserve, Yunnan, China, between May 2008 and August 2016 to assess the impacts of elevation on feeding behavior and diet. Across our sample, <i>R. bieti</i> occupied elevations between 3031 and 3637 m above mean sea level (amsl), with a 315.1 m amsl range across months and a 247.3 m amsl range across seasons. Contrary to expectations, individuals spent less time feeding when ranging across higher elevations. Lichen consumption correlated with elevation use across months and seasons, with individuals spending more time feeding on this important resource at higher elevations. Leaf consumption only correlated with elevation use during the spring. Our results suggest that <i>R. bieti</i> do not maximize their food intake at higher elevations and that monthly and seasonal changes in lichen and leaf consumption largely explain variation in elevation use. These findings shed light on the responses of <i>R. bieti</i> to environmental change and offer insight into strategies for conserving their habitats in the face of anthropogenic disturbance.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajp.23627","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140568113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kaelyn Dobson, Katie Gerstner, Rahayu Oktaviani, Christopher Shaffer, Jill Pruetz
{"title":"Working and impacting local communities as establishing the start of a conservation initiative: American Society of Primatology conservation committee webinar","authors":"Kaelyn Dobson, Katie Gerstner, Rahayu Oktaviani, Christopher Shaffer, Jill Pruetz","doi":"10.1002/ajp.23628","DOIUrl":"10.1002/ajp.23628","url":null,"abstract":"<p>Nonhuman primate species currently face human-induced pressures and will continue to face them in the modern landscape. These pressures require conservation projects in primate habitat countries to aid in protection, preservation, and conservation. Though there are several examples of primate conservation projects, starting up an initiative can be a daunting task. The American Society of Primatology (ASP) Conservation Committee hosted a video webinar presenting on the first steps of developing, running and continuing a primate conservation program. Dr. Christopher Shaffer, Rahayu Oktaviani, and Dr. Jill Pruetz presented their early program experiences establishing wild primate conservation projects to educate primatologists around the world. The running themes of the presentations included establishing community, working locally, impacting locally and preparing for the future.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajp.23628","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140568202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Susan M. Cheyne, Carolyn Thompson, Alizeé Martin, Abdul Aziz K. Aulia, Helene Birot, Eka Cahyaningrum, Joana Aragay, Petricia Andini Hutasoit, Jito Sugardjito
{"title":"The power of gibbon songs: Going beyond the research to inform conservation actions","authors":"Susan M. Cheyne, Carolyn Thompson, Alizeé Martin, Abdul Aziz K. Aulia, Helene Birot, Eka Cahyaningrum, Joana Aragay, Petricia Andini Hutasoit, Jito Sugardjito","doi":"10.1002/ajp.23626","DOIUrl":"10.1002/ajp.23626","url":null,"abstract":"<p>Gibbons (Hylobatidae) are the smallest of the apes, known for their arboreal behavior and stereotyped songs. These species and sex-specific songs are often the subject of detailed studies regarding their evolution, responses to changing environments, involvement in social behavior, and used to design vocalization-based survey techniques to monitor population densities and trends. What is poorly understood is the value and impact of using the science and sound of gibbon vocalization and gibbon stories in education and outreach to complement nongovernmental organizations (NGOs) efforts. We present an example of how Borneo Nature Foundation, a NGOs based in Indonesia, is working to use the recordings of the songs of Bornean white-bearded gibbons (<i>Hylobates albibarbis</i>) to inform conservation actions and education efforts. Gibbons in Indonesia are often poorly known or understood by the public compared to orangutans (<i>Pongo</i> spp). We showcase how a field of study, namely primate acoustics, is an untapped resource to create digital content to engage with local, national and international communities and can be developed into educational tools in the form of storytelling, mobile apps and games, to highlight the plight of these threatened species and how to conserve them.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajp.23626","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140568198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ítalo Mourthé, Fernanda P. Paim, Michelle P. Mercês, João Valsecchi, Rafael M. Rabelo
{"title":"Update of the geographic range of Humboldt's squirrel monkeys (Saimiri cassiquiarensis cassiquiarensis Lesson, 1840) using a model-based approach","authors":"Ítalo Mourthé, Fernanda P. Paim, Michelle P. Mercês, João Valsecchi, Rafael M. Rabelo","doi":"10.1002/ajp.23625","DOIUrl":"10.1002/ajp.23625","url":null,"abstract":"<p><i>Saimiri cassiquiarensis cassiquiarensis</i> (Cebidae) is a primate subspecies with a wide distribution in the Amazonian region of Brazil, Colombia, and Venezuela. However, the boundaries of its geographic range remain poorly defined. This study presents new occurrence localities for this subspecies and updates its distribution using a compiled data set of 140 occurrence records based on literature, specimens vouchered in scientific collections, and new field data to produce model-based range maps. After cleaning our data set, we updated the subspecies' extent of occurrence, which was used in model calibration. We then modeled the subspecies' range using a maximum entropy algorithm (MaxEnt). The final model was adjusted using a fixed threshold, and we revised this polygon based on known geographic barriers and parapatric congeneric ranges. Our findings indicate that this subspecies is strongly associated with lowland areas, with consistently high daily temperatures. We propose modifications to all range boundaries and estimate that 3% of the area of occupancy (AOO, as defined by IUCN) has already been lost due to deforestation, resulting in a current range of 224,469 km<sup>2</sup>. We also found that 54% of their AOO is currently covered by protected areas (PAs). Based on these results, we consider that this subspecies is currently properly classified as Least Concern, because it occupies an extensive range, which is relatively well covered by PAs, and is currently experiencing low rates of deforestation.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140334383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Marissa S. Milstein, Christopher A. Shaffer, Phillip Suse, Elisha Marawanaru, Romel Shoni, Steven Suse, Bemner Issacs, Peter A. Larsen, Dominic A. Travis, Karen A. Terio, Tiffany M. Wolf
{"title":"The establishment of a collaborative surveillance program with indigenous hunters to characterize primate health in Southern Guyana","authors":"Marissa S. Milstein, Christopher A. Shaffer, Phillip Suse, Elisha Marawanaru, Romel Shoni, Steven Suse, Bemner Issacs, Peter A. Larsen, Dominic A. Travis, Karen A. Terio, Tiffany M. Wolf","doi":"10.1002/ajp.23622","DOIUrl":"10.1002/ajp.23622","url":null,"abstract":"<p>The consumption of primates is integral to the traditional subsistence strategies of many Indigenous communities throughout Amazonia. Understanding the overall health of primates harvested for food in the region is critical to Indigenous food security and thus, these communities are highly invested in long-term primate population health. Here, we describe the establishment of a surveillance comanagement program among the Waiwai, an Indigenous community in the Konashen Amerindian Protected Area (KAPA). To assess primate health in the KAPA, hunters performed field necropsies on primates harvested for food and tissues collected from these individuals were analyzed using histopathology. From 2015 to 2019, hunters conducted 127 necropsies across seven species of primates. Of this sample, 82 primates (between 2015 and 2017) were submitted for histopathological screening. Our histopathology data revealed that KAPA primates had little evidence of underlying disease. Of the tissue abnormalities observed, the majority were either due to diet (e.g., hepatocellular pigment), degenerative changes resulting from aging (e.g., interstitial nephritis, myocyte lipofusion), or nonspecific responses to antigenic stimulation (renal and splenic lymphoid hyperplasia). In our sample, 7.32% of individuals had abnormalities that were consistent with a viral etiology, including myocarditis and hepatitis. Internal parasites were observed in 53.66% of individuals and is consistent with what would be expected from a free-ranging primate population. This study represents the importance of baseline data for long-term monitoring of primate populations hunted for food. More broadly, this research begins to close a critical gap in zoonotic disease risk related to primate harvesting in Amazonia, while also demonstrating the benefits of partnering with Indigenous hunters and leveraging hunting practices in disease surveillance and primate population health assessment.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajp.23622","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140334382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Caroline Gérard, Ameline Bardo, Jean Pascal Guéry, Emmanuelle Pouydebat, Victor Narat, Bruno Simmen
{"title":"Influence of food physical properties and environmental context on manipulative behaviors highlighted by new methodological approaches in zoo-housed bonobos (Pan paniscus)","authors":"Caroline Gérard, Ameline Bardo, Jean Pascal Guéry, Emmanuelle Pouydebat, Victor Narat, Bruno Simmen","doi":"10.1002/ajp.23624","DOIUrl":"10.1002/ajp.23624","url":null,"abstract":"<p>Research on manipulative abilities in nonhuman primates, in the context of hominid evolution, has mostly focused on manual/pedal postures considered as static behaviors. While these behavioral repertoires highlighted the range of manipulative abilities in many species, manipulation is a dynamic process that mostly involves successive types of grips before reaching its goal. The present study aims to investigate the use of manual/pedal postures in zoo-housed bonobos in diverse dynamic food processing by using an innovative approach: the optimal matching analysis that compares sequences (<i>i.e</i>., succession of grasping postures) with each other. To characterize the manipulative techniques spontaneously employed by bonobos, we performed this sequential analysis of manual/pedal postures during 766 complete feeding sequences of 17 individuals. We analyzed the effectiveness with a score defined by a partial proxy of food intake (i.e., the number of mouthfuls) linked to a handling score measuring both the diversity and changes of manual postures during each sequence. We identified four techniques, used differently depending on the physical substrate on which the individual performed food manipulation and the food physical properties. Our results showed that manipulative techniques were more complex (<i>i.e</i>., higher handling score) for large foods and on substrates with lower stability. But the effectiveness score was not significantly lower for these items since manipulative complexity seemed to be compensated by a greater number of mouthfuls. It appeared that the techniques employed involved a trade-off between manipulative complexity and the amount of food ingested. This study allowed us to test and validate innovative analysis methods that are applicable to diverse ethological studies involving sequential events. Our results bring new data for a better understanding of the evolution of manual abilities in primates in association with different ecological contexts and both terrestrial and arboreal substrates and suggest that social and individual influences need to be explored further.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajp.23624","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140304421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}