Behavioural Repertoires and Time Budgets of Semi-Free-Ranging and Captive Groups of Wedge-Capped Capuchin Monkeys, Cebus olivaceus, in Zoo Exhibits in Venezuela

2015 ◽  
Vol 86 (3) ◽  
pp. 203-222 ◽  
Author(s):  
Zaida T�rano ◽  
Marie Charlotte L�pez
Keyword(s):  
Capuchin Monkeys ◽  
Time Budgets ◽  
Cebus Olivaceus ◽  
Free Ranging

The Influence of Group Size On Predator Scanning and Foraging Behaviour of Wedgecapped Capuchin Monkeys (Cebus Olivaceus)

Behaviour ◽  
1986 ◽  
Vol 98 (1-4) ◽  
pp. 240-258 ◽  
Author(s):  
Jan R. De Ruiter
Keyword(s):  
Group Size ◽  
Foraging Behaviour ◽  
Group Formation ◽  
Food Competition ◽  
Food Sources ◽  
Capuchin Monkeys ◽  
Time Budgets ◽  
Large Group ◽  
Cebus Olivaceus ◽  
Travel Distances

AbstractThe behaviour of two groups of wedgecapped capuchin monkeys, Cebus olivaceus, a small one (n = 8) and a large one (n = 25) was recorded. Time budgets and other aspects of behaviour depended on group size. The differences can be explained as: adjustment to predation risk and intra-group food competition. In order to evade predation, members of the small groups scan more and stay at greater heights than those of the large group. Higher food competition within the large group was reflected in the composition of its diet, in longer travel distances, and higher levels of social behaviour. In particular during the dry season, the large group exploited unattractive and risky food sources. These results support ALEXANDER'S hypothesis on the causes of group formation.

Demography and Group Structure in Wedgecapped Capuchin Monkeys, Cebus Olivaceus

Behaviour ◽  
1988 ◽  
Vol 104 (3-4) ◽  
pp. 202-232 ◽  
Author(s):  
John G. Robinson
Keyword(s):  
Sex Ratio ◽  
Life Table ◽  
Group Structure ◽  
Age Distribution ◽  
Capuchin Monkeys ◽  
Demographic Parameters ◽  
Adult Size ◽  
Sex Composition ◽  
Cebus Olivaceus ◽  
Age And Sex

AbstractThe extent to which population demography determines the age and sex composition of primate groups was examined using data from a population of wedge-capped capuchin monkeys Cebus olivaceus in central Venezuela. Demographic parameters were derived from censuses of individually recognized, aged, and sexed individuals living in nine groups over a ten year period. Animals were aged by extrapolation from census data. Animals of both sexes were classed as infants during their first year, and juveniles until they reached six years of age. Females reach sexual maturity at this time, while males were classed as subadults until they reached full adult size at age 12. Adulthood lasts at least 30 years in females, at least 24 years in males. Age-sex class specific mortality and fecundity rates generated a life table which indicated that the population was increasing (r = 0.087) between 1977 and 1986. The age and sex composition of the nine groups was described annually. On average, non-adults made up 60% of a group, with this percentage increasing with group size. There were more females than males in all groups in all years. The strong female-biased adult sex ratio (1:4.4) was a consequence of a biased birth sex ratio (1:1.9), higher female than male survivorship especially between the ages of 3 and 7 when males were dispersing, and a pronounced sexual bimaturism. The stable age distribution derived from the life table successfully predicted the observed average distribution of age-sex categories in groups. This suggests that the group structure of Cebus olivaceus groups is not a consequence of intragroup social interactions, but results from demographic parameters.

Exposure to rabies virus in a population of free-ranging capuchin monkeys (Cebus apella nigritus) in a fragmented, environmentally protected area in southeastern Brazil

Primates ◽  
2012 ◽  
Vol 53 (3) ◽  
pp. 227-231 ◽  
Author(s):  
Gustavo Puglia Machado ◽  
João Marcelo Azevedo de Paula Antunes ◽  
Wilson Uieda ◽  
Alexander Welker Biondo ◽  
Tatiana Morosini de Andrade Cruvinel ◽  
...  
Keyword(s):  
Rabies Virus ◽  
Protected Area ◽  
Cebus Apella ◽  
Southeastern Brazil ◽  
Capuchin Monkeys ◽  
Free Ranging

Anecdotic observations of homosexual behaviour among male capuchin monkeys (Sapajus sp.)

Behaviour ◽  
2020 ◽  
Vol 158 (1) ◽  
pp. 89-97
Author(s):  
Henrique P. Rufo ◽  
Eduardo B. Ottoni
Keyword(s):  
New World ◽  
Group Living ◽  
Squirrel Monkeys ◽  
Cebus Capucinus ◽  
Capuchin Monkeys ◽  
New World Monkeys ◽  
Old World Monkeys ◽  
Age Group ◽  
Experimental Apparatus ◽  
Free Ranging

Abstract Many species were reported engaging in homosexual behaviour among mammals, birds, reptiles and insects. In primates, this behaviour seems to be much more frequent among apes and Old World monkeys than in New World monkeys, where only a few species, like squirrel monkeys, tamarins, marmosets, and capuchins, have been observed engaging in same-sex mounts. In capuchin monkeys, homosexual mounting has been rarely reported, with a few observations in Cebus capucinus and captive Sapajus groups. However, homosexual behaviour between males of the genus Sapajus has never before been reported outside captivity. Our observations are the first made with a semi free-ranging group living in the Tiete Ecological Park (São Paulo, SP, Brazil), during an experimental study. Four events of male-male mounts were observed, involving six individuals — two juveniles and four adults, which do not seem related to hierarchical or age group factors, but could be related to getting access to our experimental apparatus.

scholarly journals Can color vision variation explain sex differences in invertebrate foraging by capuchin monkeys?

2010 ◽  
Vol 56 (3) ◽  
pp. 300-312 ◽  
Author(s):  
Amanda D. Melin ◽  
Linda M. Fedigan ◽  
Hilary C. Young ◽  
Shoji Kawamura
Keyword(s):  
Sex Differences ◽  
Color Vision ◽  
New World ◽  
Sex Differentiation ◽  
Cebus Capucinus ◽  
Capuchin Monkeys ◽  
New World Monkeys ◽  
Foraging Patterns ◽  
Monkey Species ◽  
Free Ranging

Abstract Invertebrates are the main source of protein for many small-to-medium sized monkeys. Prey vary in size, mobility, degree of protective covering, and use of the forest, i.e. canopy height, and whether they are exposed or embed themselves in substrates. Sex-differentiation in foraging patterns is well documented for some monkey species and recent studies find that color vision phenotype can also affect invertebrate foraging. Since vision phenotype is polymorphic and sex-linked in most New World monkeys - males have dichromatic vision and females have either dichromatic or trichromatic vision - this raises the possibility that sex differences are linked to visual ecology. We tested predicted sex differences for invertebrate foraging in white-faced capuchins Cebus capucinus and conducted 12 months of study on four free-ranging groups between January 2007 and September 2008. We found both sex and color vision effects. Sex: Males spent more time foraging for invertebrates on the ground. Females spent more time consuming embedded, colonial invertebrates, ate relatively more “soft” sedentary invertebrates, and devoted more of their activity budget to invertebrate foraging. Color Vision: Dichromatic monkeys had a higher capture efficiency of exposed invertebrates and spent less time visually foraging. Trichromats ate relatively more “hard” sedentary invertebrates. We conclude that some variation in invertebrate foraging reflects differences between the sexes that may be due to disparities in size, strength, reproductive demands or niche preferences. However, other intraspecific variation in invertebrate foraging that might be mistakenly attributed to sex differences actually reflects differences in color vision.

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