American Journal of Primatology最新文献

{"title":"How Do Common Marmosets Maintain the Balance Between Response Execution and Action Inhibition?","authors":"Ranshikha Samandra,&nbsp;Marcello G. P. Rosa,&nbsp;Farshad A. Mansouri","doi":"10.1002/ajp.23717","DOIUrl":"10.1002/ajp.23717","url":null,"abstract":"<p>Socio-dynamic situations require a balance between response execution and action inhibition. Nonadaptive imbalance between response inhibition and execution exists in neurodevelopmental and neuropsychological disorders. To investigate the underlying neural mechanisms of cognitive control and the related deficits, comparative studies in human and nonhuman primates are crucial. Previous stop-signal tasks in humans and macaque monkeys have examined response execution (response time (RT) and accuracy in Go trials) and action inhibition (stop-signal reaction time (SSRT)). Even though marmosets are generally considered suitable translational animal models for research on social and cognitive deficits, their ability to inhibit behavior remains poorly characterized. We developed a marmoset stop-signal task, in which RT could be measured at millisecond resolution. All four marmosets performed many repeated Go trials with high accuracy (≥ 70%). Additionally, all marmosets successfully performed Stop trials. Using a performance-dependent tracking procedure, the accuracy in Stop trials was maintained around 50%, which enabled reliable SSRT estimates in marmosets for the first time. The mean SSRT values across sessions ranged between 677 and 1464 ms across the four marmosets. We also validated the suitability and practicality of this novel task for examining executive functions by testing the effects of a natural hormone, oxytocin, on response execution and action inhibition in marmosets. This marmoset model, for reliable (millisecond resolution) assessment of the balance between response execution and inhibition, will further facilitate studying the developmental alterations in inhibition ability and examining the effects of various contextual and environmental factors on marmosets' executive functions.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":"87 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11714342/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142942743","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}

{"title":"Hand Preferences in Olive Baboons (Papio anubis) During Cognitive Performance on Match-to-Sample Tasks and Natural Behaviors","authors":"Logan R. Brownell,&nbsp;Jessica F. Cantlon,&nbsp;Caroline M. DeLong","doi":"10.1002/ajp.23728","DOIUrl":"10.1002/ajp.23728","url":null,"abstract":"<div>\u0000 \u0000 <p>An individual shows handedness when they consistently prefer one hand over the other for tasks that can be performed with either hand. Humans have a population-level right-hand preference, and past research shows that a variety of nonhuman primate species also show hand preferences. More complex manual tasks elicit stronger hand preferences than less complex manual tasks, but not much is known about hand preferences during a cognitive task in nonhuman primates. The current study investigated hand preferences in olive baboons (<i>Papio anubis</i>). Seven baboons participated in a match-to-sample task on a touchscreen computer. We recorded each baboon's hand use as they touched the start box, sample stimulus, choice stimulus, and which hand they used to retrieve the food reward. All 10 baboons in the troop were also observed in their outdoor zoo habitat, where they were carrying out natural behaviors. In the current study, the touchscreen task was cognitively demanding, without being manually complex, as the baboon simply touched the screen. The direction and strength of hand preference were calculated using <i>z</i>-scores and handedness index (HI) scores for each individual baboon. When completing the cognitive task, five baboons were left-handed, and two baboons were right-handed. Five of the baboons had strong preferences (three left-handed and two right-handed) and two had weak preferences. When engaging in natural behaviors, eight baboons were left-handed, one baboon was right-handed, and one baboon was ambiguously handed. Two of the baboons had strong preferences (one right-handed and one left-handed), and eight had weak preferences. Four of the seven baboons had consistent hand preferences when completing the cognitive task and when engaging in natural behaviors in their habitat. These results show that similar to manually complex tasks, a complex cognitive task such as match-to-sample elicits stronger and more directional hand preferences than natural behaviors.</p></div>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":"87 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142942739","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}

{"title":"Correction to “Stable Isotopes Analysis of Black Lion Tamarins Reveals Increasing Arthropod Consumption When Fruit Productivity Decreases in Forest Fragments”","authors":"","doi":"10.1002/ajp.23730","DOIUrl":"10.1002/ajp.23730","url":null,"abstract":"<p>Raskin, A., O. Kaisin, L. N. Michel, et al. 2025. “Stable Isotopes Analysis of Black Lion Tamarins Reveals Increasing Arthropod Consumption When Fruit Productivity Decreases in Forest Fragments.” <i>American Journal of Primatology</i> 87: e23698. https://doi.org/10.1002/ajp.23698.</p><p>In the originally published version of this article, Felipe Bufalo was missing from the author list. The complete author list is as follows:</p><p>Amazone Raskin, Olivier Kaisin, Loïc N. Michel, Benjamin Lejeune, Gilles Lepoint, Rodrigo Gonçalves Amaral, Felipe Bufalo, Gabriel Pavan Sabino, Márcio Silva Araújo, Gabriela Cabral Rezende, Fany Brotcorne, Laurence Culot</p><p>Felipe Bufalo's affiliation is as follows:</p><p>Laboratório de Primatologia, Departamento de Biodiversidade, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Rio Claro, São Paulo, Brazil.</p><p>Felipe Bufalo's contributions are data curation (supporting), methodology (supporting).</p><p>In the acknowledgements, the following sentence should have been added: FB received a fellowship from FAPESP (#2023/01760-0), from CAPES (#88881.846203/2023-01), and from the Brazilian National Council for Scientific and Technological Development (CNPq: #133172/2018-0 and #443489/2020-3).</p><p>The online version of the article has been updated accordingly.</p><p>We apologize for this error.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":"87 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajp.23730","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142942737","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}

{"title":"History of Health at Cayo Santiago—An Investigation of Environmental and Genetic Influences on the Skeletal Remains of the Introduced Rhesus Macaque (Macaca mulatta) Colony","authors":"George Francis,&nbsp;Qian Wang","doi":"10.1002/ajp.23722","DOIUrl":"10.1002/ajp.23722","url":null,"abstract":"<div>\u0000 \u0000 <p>The Cayo Santiago rhesus macaque colony is a renowned primate population that has experienced significant natural and anthropogenic ecological variation in their 85-year history. Demographic and familial information is also tracked and collated for the majority of monkeys. Thus, the health history of rhesus macaques at Cayo Santiago should reflect the impacts of both environmental and genetic factors. In this study, we utilized a sample of skeletal remains comprised of 2787 individuals (1571 females, 1091 males), born between 1938 and 2017 from the derived skeletal collection of the primate colony to assess variation in survivorship, pathology, bone mineral density (BMD), and dental eruption status, in the context of hurricane impacts, nutritional fluctuations, and matriline genealogy. Results demonstrated that rhesus macaques at Cayo Santiago exhibit a range of skeletal pathologies that encompass biomedical and archaeological significance, multiple etiologies, severities, locations, and types, in addition to a secular trend of declining BMD that is hypothesized to reflect decreasing physical activity levels under increasing population densities. Specifically, hurricane impacts were found to increase the rate of systemic disease, decrease BMD in young adults, and delay eruption of the primary dentition. Certain matrilines exhibited heightened levels of systemic disease at early ages while others exhibited greater rates of congenital disease. Early-life adversity, through the experience of major hurricanes, may enhance inflammatory pathways, heightening the risk of disease and accelerating the aging process leading to reduced BMD. Such impacts may underly greater levels of observed infection post-hurricane through intensification of pathogen transmission and disease rates brought on by hurricane-adaptive social strategies that favor closer proximity. Familial susceptibility to disease indicates heritable host genetic factors are likely influencing disease patterning in the population. A cluster of congenital diseases may most convincingly illustrate this, or alternatively reflects low levels of genetic diversity in the population.</p></div>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":"87 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142942741","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}

{"title":"Stone Tool Use by Black-Horned Capuchin Monkeys (Sapajus nigritus cucullatus) in an Urban Park in Londrina, Brazil","authors":"Julia Santos Gutierres,&nbsp;Felipe Santos Machado Pereira,&nbsp;Jessica Ward Lynch,&nbsp;Ana Paula Vidotto Magnoni","doi":"10.1002/ajp.23704","DOIUrl":"10.1002/ajp.23704","url":null,"abstract":"<div>\u0000 \u0000 <p>Tool use to crack open palm nuts has been observed extensively in some capuchin monkey species. However, for southern black-horned capuchin monkeys (<i>Sapajus nigritus cucullatus</i>), there is only one published record of stone tool use from the 1990s, from an urban park in Londrina, Brazil. In the present study, we returned to this urban park to systematically investigate the hammer-and-anvil sites used to crack nuts by this capuchin monkey population. We analyzed the fruit and shell remnants resulting from hammering to test the following hypotheses: (1) hammers at tool-use sites are actively chosen for size and/or weight, (2) tool use sites that are closer to a tree of the processed plant species are more frequently used, and (3) there is no seasonal effect modulating hammer-and-anvil use for processing nuts. We located and identified 205 tool-use sites through active search within the park, and we measured and weighed the tools involved in hammering activity. We compared hammer weight and size to that of the comparable material available in the environment and found that hammer size and weight differed significantly from that of the raw materials found in the environment, suggesting active choice of the hammers. We identified three plant species for which nuts were processed through tool use: <i>Syagrus romanzoffiana</i>, <i>Acrocomia aculeata</i> and <i>Terminalia catappa</i>. Through measuring the distance between each tool-use site and the nearest tree of the plant species processed there, we found that closer proximity between the tool-use site and the nearest target tree (<i>Syagrus</i> and <i>Acrocomia</i>) increased cracking frequency. We returned to each site three times during the study year to determine if new tool use activity had occurred, and our data indicate habitual use of tools to crack open nuts throughout the year, with no large differences between seasons.</p></div>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":"87 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142920535","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}

{"title":"Correction to “Neutrophil to Lymphocyte Ratio in Captive Olive Baboons (Papio anubis): The Effects of Age, Sex, Rearing, Stress, and Pregnancy”","authors":"","doi":"10.1002/ajp.23726","DOIUrl":"10.1002/ajp.23726","url":null,"abstract":"<p>\u0000 \u0000 </p><p>We apologize for this error.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":"87 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajp.23726","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142908998","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}

{"title":"Multiple Motivations: Agonistic Coalitions and Interventions in Blue Monkeys","authors":"Kyle Rotter,&nbsp;Marina Cords","doi":"10.1002/ajp.23719","DOIUrl":"https://doi.org/10.1002/ajp.23719","url":null,"abstract":"<div>\u0000 \u0000 <p>Primates are known for forming agonistic coalitions, but most data come from species in which agonism occurs frequently and rank predicts fitness. We analyzed coalitions and interventions in wild blue monkeys (<i>Cercopithecus mitis</i>), in which both agonism and third-party involvement are relatively rare, and in which rank does not predict fitness. Data came from a long-term study in the Kakamega Forest, Kenya, spanning 12 years and 12 groups. Intervening animals both supported winners and defended losers, and coalition partners nearly always prevailed over their opponent. Adult females were joiners and juveniles were coalition-recipients disproportionately, while opponents were disproportionately adults, especially males. A multivariate analysis confirmed these patterns and also showed that joiners were most likely to support the original contestant who was winning (vs. unclear outcome or losing) and the one to whom they were more closely related. A subset of the data showed higher odds of joining the higher- versus lower-ranking original opponent. In high-risk interventions (coalition recipient losing, joiner smaller than opponent), the preference for more related opponents was magnified. Blue monkeys intervening in agonistic disputes appear to take sides in ways that minimize costs by supporting the winner, while maximizing inclusive fitness benefits by preferring the more closely related contestant, especially when intervention is risky. Their additional tendencies to support young individuals versus older ones, all else equal, suggest an additional motivation to protect vulnerable group-mates. Coalitions of smaller-bodied groupmates may contribute to the social peripheralization of the group's adult male.</p></div>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":"87 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143120252","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}

{"title":"Wild Tibetan Macaques Use a Route-Based Mental Map to Navigate in Large-Scale Space","authors":"Shi Cheng,&nbsp;Bo-Wen Li,&nbsp;Paul A. Garber,&nbsp;Dong-Po Xia,&nbsp;Jin-Hua Li","doi":"10.1002/ajp.23720","DOIUrl":"10.1002/ajp.23720","url":null,"abstract":"<div>\u0000 \u0000 <p>Many animals face significant challenges in locating and acquiring resources that are unevenly distributed in space and time. In the case of nonhuman primates, it remains unclear how individuals remember goal locations and whether they navigate using a route-based or a coordinate-based mental representation when moving between out-of-sight feeding and resting sites (i.e., large-scale space). Here, we examine spatial memory and mental map formation in wild Tibetan macaques (<i>Macaca thibetana</i>) inhabiting a mountainous, forested ecosystem characterized by steep terrain that limits direct vision to 25 meters. We used an instantaneous scan sampling technique at 10-min intervals to record the behavior and location of macaques on Mt. Huangshan, Anhui Province, China, from September 2020 to August 2023. Over 214 days, we obtained 7180 GPS points of the macaques' locations. Our study revealed that the macaques reused 1264 route segments (average length 204.26 m) at least four times each. The number of feeding and resting sites around the habitual route segment, terrain roughness, and dense vegetation areas significantly influenced the use of route segments by our study group. In addition, we found evidence that the monkeys reused 48 nodes to reorient their travel path. We found that monkeys approached a revisited foraging or resting site from the same limited set of directions, which is inconsistent with a coordinate-based spatial representation. In addition, the direction in which the macaques left a feeding or resting site was significantly different from the straight-line direction required to reach their next feeding or resting site, suggesting that the macaques frequently reoriented their direction of travel to reach their goal. Finally, on average, macaques traveled 24% (CI = 1.24) farther than the straight-line distance to reach revisited feeding and resting sites. From our robust data set, we conclude that Tibetan macaques navigate large spaces using a route-based mental representation that appears to help them locate food resources in dense, rugged montane forests and heterogeneous habitats.</p></div>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":"87 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142891647","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}

{"title":"Correction to “Where and How: Stone Tool Sites of Endangered Blonde Capuchin Monkeys in the Caatinga Environment in Northeastern Brazil”","authors":"","doi":"10.1002/ajp.23725","DOIUrl":"10.1002/ajp.23725","url":null,"abstract":"<p>Rufino, M. G., J. J. da Silva, and J. P. Souza-Alves. 2025. “Where and How: Stone Tool Sites of Endangered Blonde Capuchin Monkeys in the Caatinga Environment in Northeastern Brazil.” <i>American Journal of Primatology</i> 87: e23705.</p><p>In topic Ethical Notes, the text “All procedures were performed in accordance with Brazilian law, under the approval of the environmental authorities IBAMA/ICMBio (approval #25727), and in compliance with the American Society of Primatologists Principles for the Ethical Treatment of nonhuman Primates” was incorrect. This should be “All contributors declared that the studies adhered to the legal requirements of Brazil, where we conducted the fieldwork. The study complied with the ethical requirements of the institutions and government concerned. The study adhered to the Code of Best Practices for Field Primatology of the American Society of Primatologists (https://www.asp.org/society/resolutions/EthicalTreatmentOfNonHumanPrimates.cfm) and of the International Primatological Society (www.asp.org/resources/docs/Code%20of_Best_Practices%20Oct%202014.pdf).”</p><p>We apologize for this error.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":"87 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ajp.23725","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142891645","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}

{"title":"Selectivity in Buttress Drumming Tree Properties Among Chimpanzees (Pan troglodytes schweinfurthii) of the Waibira Community in Budongo Forest, Uganda","authors":"Wytse Wilhelm,&nbsp;Vesta Eleuteri,&nbsp;Kathelijne Koops,&nbsp;Maegan Fitzgerald,&nbsp;Klaus Zuberbühler,&nbsp;Catherine Hobaiter","doi":"10.1002/ajp.23712","DOIUrl":"10.1002/ajp.23712","url":null,"abstract":"<p>Wild chimpanzees drum on tree buttresses during dominance displays and travel, generating low-frequency sounds that are audible over distances of more than 1 km. Western chimpanzees (<i>Pan troglodytes verus</i>) in the Nimba Mountains of Guinea selectively choose trees and buttresses when drumming, potentially based on their resonant properties, suggesting that these chimpanzees are optimizing their drumming signals. We investigated whether male eastern chimpanzees (<i>Pan troglodytes schweinfurthii</i>) from the Waibira community in the Budongo Forest, Uganda, also show preferences in tree and buttress choice, exploring whether selectivity is a species-wide feature. We tested chimpanzee preferences for tree species and diameter, number of buttresses, and buttress area and width, by comparing trees and buttresses used in drumming bouts with nearby unused trees and buttresses. Waibira chimpanzees drummed preferentially on two tree species: the tropical hardwood <i>Cynometra alexandrii</i> and the softwood <i>Chrysophyllum albidum</i>. Chimpanzees selected trees with a larger diameter over nearby trees with a smaller diameter, and buttresses were more likely to be used for drumming if they had a larger area or larger width. These results suggest that chimpanzees in the Waibira community select trees and buttresses based on physical properties, most likely related to acoustically relevant characteristics. These findings support the argument that buttress drumming is a goal-directed behavior and contributes to our understanding of chimpanzees' use and optimization of their long-distance acoustic signals.</p>","PeriodicalId":7662,"journal":{"name":"American Journal of Primatology","volume":"87 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11669765/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142891646","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}