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American Journal of Primatology

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https://www.readbyqxmd.com/read/28431195/feeding-behavior-and-activity-budget-of-the-southern-yellow-cheeked-crested-gibbons-nomascus-gabriellae-in-a-lowland-tropical-forest
#1
Thanh H Bach, Jin Chen, Minh D Hoang, Kingsly C Beng, Van T Nguyen
The southern yellow-cheeked crested gibbon (Nomascus gabriellae), an endangered species native to Vietnam and Cambodia, lives exclusively in undisturbed tropical forests and depends primarily on ripe fruit for food. Although this species is highly threatened, its ecology and conservation status remain relatively unknown. In order to understand how this heavily frugivorous primate adapts to the seasonal fluctuation of fruit resources in the forest, we collected feeding behavior and ranging activity data on one group of southern yellow-cheeked crested gibbons in Cat Tien National Park, Vietnam, over 1-year period...
April 21, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28431190/higher-levels-of-submissive-behaviors-at-the-onset-of-the-pairing-process-of-rhesus-macaques-macaca-mulatta-are-associated-with-lower-risk-of-wounding-following-introduction
#2
Ori Pomerantz, Kate C Baker
Social housing of rhesus macaques (Macaca mulatta) is considered to be the cornerstone of behavioral management programs in biomedical facilities. However, it also involves the risk of socially inflicted trauma. The ability to avoid such trauma would contribute to the animals' well-being and alleviate staff's concerns, thus paving the path for more introductions. Here, we sought to address the conflict between the need to socially house rhesus macaques and the need to bring social wounding to a minimum by identifying behaviors expressed early in social introductions, that may serve as predictors of later wounding events...
April 21, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28427115/personality-assessment-and-model-comparison-with-behavioral-data-a-statistical-framework-and-empirical-demonstration-with-bonobos-pan-paniscus
#3
Jordan S Martin, Scott A Suarez
Interest in quantifying consistent among-individual variation in primate behavior, also known as personality, has grown rapidly in recent decades. Although behavioral coding is the most frequently utilized method for assessing primate personality, limitations in current statistical practice prevent researchers' from utilizing the full potential of their coding datasets. These limitations include the use of extensive data aggregation, not modeling biologically relevant sources of individual variance during repeatability estimation, not partitioning between-individual (co)variance prior to modeling personality structure, the misuse of principal component analysis, and an over-reliance upon exploratory statistical techniques to compare personality models across populations, species, and data collection methods...
April 20, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28407328/distinctiveness-enhances-long-term-event-memory-in-non-human-primates-irrespective-of-reinforcement
#4
Amy Lewis, Josep Call, Dorthe Berntsen
Non-human primates are capable of recalling events that occurred as long as 3 years ago, and are able to distinguish between similar events; akin to human memory. In humans, distinctiveness enhances memory for events, however, it is unknown whether the same occurs in non-human primates. As such, we tested three great ape species on their ability to remember an event that varied in distinctiveness. Across three experiments, apes witnessed a baiting event in which one of three identical containers was baited with food...
April 13, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28407279/orangutan-trade-confiscations-and-lack-of-prosecutions-in-indonesia
#5
Vincent Nijman
Prosecuting and sentencing law breakers punishes the offender and acts as a deterrent for future law breakers. With thousands of Sumatran and Bornean orangutans (Pongo abelii and P. pygmaeus) having entered private and government rescue centers and facilities, I evaluate the role of successful prosecution in orangutan conservation in Indonesia. Orangutans have been protected in Indonesian since 1931 and they are not allowed to be traded or to be kept as pets. In the period 1993-2016 at least 440 orangutans were formally confiscated, and many more were "donated" to law enforcement agencies...
April 13, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28407272/the-relative-effects-of-reproductive-condition-stress-and-seasonality-on-patterns-of-parasitism-in-wild-female-black-howler-monkeys-alouatta-pigra
#6
Rodolfo Martínez-Mota, Paul A Garber, Rupert Palme, Thomas R Gillespie
Parasitic infections in wildlife are shaped by host-related traits including individual reproductive condition. It has been argued that female primates are more susceptible to infectious diseases during pregnancy due to short-term changes in immune function that result in reduced ability to combat infections. Likewise, lactation, which is the most energetically expensive state, may affect immunity and infection risk due to tradeoffs between milk production and maintenance of immune function. Here, we examine the degree to which parasite prevalence and parasite richness are affected by female reproductive condition and stress levels in wild female black howler monkeys (Alouatta pigra)...
April 13, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28407267/orangutans-enamel-defects-and-developmental-health-a-comparison-of-borneo-and-sumatra
#7
Mark F Skinner, Matthew M Skinner
Orangutans (Pongo sp.) show among the highest occurrence of three types of developmental enamel defect. Two are attributed to nutritional factors that reduce bone growth in the infant's face early in development. Their timing and prevalence indicate that Sumatra provides a better habitat than does Borneo. The third type, repetitive linear enamel hypoplasia (rLEH) is very common but its etiology is not understood. Our objective is to draw attention to this enigmatic, episodic stressor in the lives of orangutans...
April 13, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28395395/contexts-and-consequences-of-takeovers-in-hamadryas-baboons-female-parity-reproductive-state-and-observational-evidence-of-pregnancy-loss
#8
Alexis L Amann, Mathew Pines, Larissa Swedell
The evolutionary consequences of sexual selection and sexual conflict are epitomized in the hamadryas baboon, a species characterized by strong sexual dimorphism and intense male-male competition. Hamadryas males coerce individual females into reproductively exclusive one-male units via aggressive takeovers, and infants involved in such takeovers are at least four times more likely to be killed (or otherwise die) after takeovers compared to other times. Here we examine female reproductive state before and after takeovers to further investigate the determinants of takeovers and their impact on female reproduction...
April 10, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28388824/conservation-strategies-for-understanding-and-combating-the-primate-bushmeat-trade-on-bioko-island-equatorial-guinea
#9
REVIEW
Drew T Cronin, Paul R Sesink Clee, Matthew W Mitchell, Demetrio Bocuma Meñe, David Fernández, Cirilo Riaco, Maximiliano Fero Meñe, Jose Manuel Esara Echube, Gail W Hearn, Mary Katherine Gonder
Bioko Island, Equatorial Guinea is among the important places in Africa for the conservation of primates, but a cultural preference for bushmeat and a lack of effective law enforcement has encouraged commercial bushmeat hunting, threatening the survival of the remaining primate population. For over 13 years, we collected bushmeat market data in the Malabo market, recording over 35,000 primate carcasses, documenting "mardi gras" consumption patterns, seasonal carcass availability, and negative effects resulting from government intervention...
April 7, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28388823/optimizing-field-and-analytical-procedures-for-estimating-densities-of-arboreal-and-threatened-primates-in-tropical-rainforest
#10
Nathalie Cavada, Marco Ciolli, Claudia Barelli, Francesco Rovero
The application of distance sampling to primate density estimation is challenging and susceptible to estimation biases, mainly due to the difficulties of properly accounting for variation in species' detectability and of accurately sampling the spread of the social groups. We apply a hierarchical distance sampling approach to primate data, to account for a comprehensive set of environmental covariates of both detectability and abundance, and we propose a novel field routine to measure the spread of groups during transect sampling...
April 7, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28388822/toughness-of-the-virunga-mountain-gorilla-gorilla-beringei-beringei-diet-across-an-altitudinal-gradient
#11
Halszka Glowacka, Shannon C McFarlin, Erin R Vogel, Tara S Stoinski, Felix Ndagijimana, Deo Tuyisingize, Antoine Mudakikwa, Gary T Schwartz
The robust masticatory system of mountain gorillas is thought to have evolved for the comminution of tough vegetation, yet, compared to other primates, the toughness of the mountain gorilla diet is unremarkable. This may be a result of low plant toughness in the mountain gorilla environment or of mountain gorillas feeding selectively on low-toughness foods. The goal of this paper is to determine how the toughness of the mountain gorilla diet varies across their habitat, which spans a large altitudinal range, and whether there is a relationship between toughness and food selection by mountain gorillas...
April 7, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28388817/social-and-demographic-correlates-of-male-androgen-levels-in-wild-white-faced-capuchin-monkeys-cebus-capucinus
#12
Franka S Schaebs, Susan E Perry, Don Cohen, Roger Mundry, Tobias Deschner
The Challenge Hypothesis, designed originally to explain the patterning of competitive behavior and androgen levels in seasonally breeding birds, predicts that males will increase their androgen levels in order to become more competitive in reproductive contexts. Here we test predictions derived from the Challenge Hypothesis in white-faced capuchin monkeys (Cebus capucinus), a species that has somewhat seasonal reproduction. We analyzed demographic and hormonal data collected over a 5.25-year period, from 18 males in nine social groups living in or near Lomas Barbudal Biological Reserve, Costa Rica...
April 7, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28346738/overlooked-small-apes-need-more-attention
#13
Pengfei Fan, Thad Q Bartlett
No abstract text is available yet for this article.
March 27, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28346700/vitamin-d-status-in-wild-toque-macaques-macaca-sinica-in-sri-lanka
#14
Michael L Power, Wolfgang P J Dittus
The vitamin D receptor is found on most cells, including active immune cells, implying that vitamin D has important biological functions beyond calcium metabolism and bone health. Although captive primates should be given a dietary source of vitamin D, under free-living conditions vitamin D is not a required nutrient, but rather is produced in skin when exposed to UV-B light. The circulating level of 25 hydroxyvitamin D (25-OH-D) considered adequate for humans is a topic of current controversy. Levels of circulating 25-OH-D sufficient for good health for macaques and other Old World anthropoids are assumed to be the same as human values, but data from free-living animals are scant...
March 27, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28346698/how-do-rivers-geographic-distance-and-dispersal-behavior-influence-genetic-structure-in-two-sympatric-new-world-monkeys
#15
Emilie Lecompte, Mohand-Ameziane Bouanani, Benoît de Thoisy, Brigitte Crouau-Roy
Dispersal, one of the major factors affecting the gene flow between populations, shapes the spatial distribution of genetic diversity within species. Alouatta macconnelli and Saguinus midas are two Neotropical monkey species that sympatrically inhabit the Guiana shield in northern Amazonia and are likely to differ in their dispersal behavior and vagility. We took advantage of their sympatry to investigate, over a fine geographical scale (∼50 km long), the relationship between spatial genetic structure, on the one hand, and geographical features and the species' dispersal behavior on the other...
March 27, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28346692/embraces-are-lateralized-in-spider-monkeys-ateles-fusciceps-rufiventris
#16
Emily R Boeving, Starlie C Belnap, Eliza L Nelson
Side biases observed in behavior are thought to reflect underlying asymmetric brain function or hemispheric specialization. Previous work in multiple species identified left side biases (associated with the right hemisphere) for processing social behavior. In highly social species such as primates, many behaviors may be categorized as social, yet differences between such behaviors have not been examined as a test of asymmetric brain function. Using Colombian spider monkeys (Ateles fusciceps rufiventris), we observed lateral positioning during two types of behaviors widely categorized as social affiliative: embracing and grooming, and identified a left bias for embracing, but not grooming...
March 27, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28346691/reproductive-status-affects-the-feeding-ecology-and-social-association-patterns-of-female-squirrel-monkeys-saimiri-collinsi-in-an-amazonian-rainforest
#17
Luana V P Ruivo, Anita I Stone, Matthew Fienup
When making foraging decisions, female primates may follow specific behavioral strategies that reflect their reproductive state. Lactation is considered the most energetically costly phase for females, but we argue that gestation is also energetically expensive for squirrel monkeys. In this study, we examined whether female squirrel monkeys (a seasonally breeding primate) in different reproductive phases showed significant differences in their foraging ecology. We sampled two wild groups of squirrel monkeys (Saimiri collinsi) using the focal animal method, during 12 months (June 2014 to May 2015)...
March 27, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28346688/how-far-do-neotropical-primates-disperse-seeds
#18
Lisieux F Fuzessy, Charles H Janson, Fernando A O Silveira
Seed dispersal distance (SDD) is a vital component of vertebrate-mediated seed dispersal process: the average distance at which seeds are deposited away from the parent plant represents the starting template of plant regeneration. We present a simple model to explain and predict observed measures of average dispersal distance and we hypothesize that it is a consequence of how long seeds are retained in the disperser's gut, how rapidly the disperser moves per unit time and how twisted the animal travel path is relative to the straight-line distance moved away from the seed source...
March 27, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28346683/obituary-robert-h-horwich-1940-2017
#19
Sam Shanee, Keefe Keeley, Noga Shanee
No abstract text is available yet for this article.
March 27, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28345759/stable-carbon-oxygen-and-nitrogen-isotope-analysis-of-plants-from-a-south-asian-tropical-forest-implications-for-primatology
#20
Patrick Roberts, Scott A Blumenthal, Wolfgang Dittus, Oshan Wedage, Julia A Lee-Thorp
Stable isotope analysis of primate tissues in tropical forest contexts is an increasingly popular means of obtaining information about niche distinctions among sympatric species, including preferences in feeding height, forest canopy density, plant parts, and trophism. However, issues of equifinality mean that feeding height, canopy density, as well as the plant parts and plant species consumed, may produce similar or confounding effects. With a few exceptions, researchers have so far relied largely on general principles and/or limited plant data from the study area as references for deducing the predominant drivers of primate isotope variation...
March 27, 2017: American Journal of Primatology
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