scholarly journals Factors Affecting the Distribution of Copulatory Plugs in Rhesus Monkeys (Macaca mulatta) on Cayo Santiago

2009 ◽  
Vol 80 (4) ◽  
pp. 264-274 ◽  
Author(s):  
J. Danzy ◽  
V. Gutierrez ◽  
J. Pampush ◽  
B. Campbell
Keyword(s):  
Macaca Mulatta ◽  
Rhesus Monkeys ◽  
Cayo Santiago ◽  
Factors Affecting ◽  
Copulatory Plugs

Individual differences in response to sibling birth among free-ranging yearling rhesus monkeys (Macaca mulatta) on Cayo Santiago

Behaviour ◽  
2003 ◽  
Vol 140 (7) ◽  
pp. 899-924 ◽  
Author(s):  
◽  
◽  
Keyword(s):  
Individual Differences ◽  
Macaca Mulatta ◽  
Rhesus Monkeys ◽  
Dynamic Assessment ◽  
Conflict Theory ◽  
Maternal Aggression ◽  
Cayo Santiago ◽  
Focal Animal ◽  
Group Members ◽  
Free Ranging

AbstractThe birth of a younger sibling is a normal event in the life of a nonhuman primate, yet commonly it is thought to be a stressful transition for the older sibling. In our previous research, we found that yearling rhesus monkeys (Macaca mulatta) experienced increases in one mild form of distress but no significant increases in overt forms of distress, in spite of significant reductions in mother-yearling interaction. Nevertheless, some individual yearlings were distressed by this transition and here we examine variables that may structure individual differences in distress. We observed 31 yearling rhesus monkeys on Cayo Santiago, Puerto Rico, during the month before and month after their siblings' births using focal animal sampling methods. Attachment theory (Bowlby, 1969), parent-offspring conflict theory (Trivers, 1974), and dynamic assessment models (Bateson, 1994) all predict a relationship between reduction in maternal care and increase in offspring distress, yet no previous study of sibling birth in primates has examined this relationship. We found that the reduction in the proportion of time on the nipple from the month before sibling birth to the month after was related to the rate of geckering (a distress vocalization) after sibling birth, and that the increase in time out of sight of the mother was related to the proportion of time yearlings spent in a tense state after sibling birth. Maternal aggression after sibling birth also was related to the yearlings' rate of geckering. Yearling distress was related to qualities of the mother-yearling relationship, in that yearlings that had relatively greater responsibility for maintaining proximity with their mothers before sibling birth were relatively more tense afterwards. Yearlings displayed increases in play, grooming, and contact with group members other than the mother after sibling birth, suggesting a marked shift toward greater maturity in their social relationships.

Genealogical Mating Activity in Free-Ranging Groups of Rhesus Monkeys (Macaca Mulatta) On Cayo Santiago

Behaviour ◽  
1973 ◽  
Vol 45 (3-4) ◽  
pp. 225-240 ◽  
Author(s):  
Elizabeth A. Missakian
Keyword(s):  
Sexual Activity ◽  
Breeding Season ◽  
Macaca Mulatta ◽  
Rhesus Monkeys ◽  
Social Groups ◽  
Sharp Contrast ◽  
Cayo Santiago ◽  
Mating Activity ◽  
Behavioral Observations ◽  
Free Ranging

AbstractBehavioral observations on a large group of free-ranging rhesus monkeys (Macaca mulatta) were carried out on Cayo Santiago from January I968 through December I969 and from October through December I970. Records of mating activity (single mounts, mount series, copulations) indicated that genealogical mating activity on Cayo Santiago had the following characteristics : (I) 5.4% of all recorded mount series and copulations involved mother-son pairs; (2) mating was observed in 3I% of 26 individual pairs of mothers and sons; (3) mating was seen in I2% of 42 individual pairs of brothers and sisters; (4) of I0 instances of mother-son mating, seven involved pairs in which the mother was dominant to the son; (5) mating in mother-son and brother-sister pairs occurred in high and low ranking genealogies within the group; (6) with two exceptions, all three to five-year old males who did engage in sexual activity with their mothers did not mate with non-related females during that breeding season; and (7) with one exception, all instances of mother-son and brother-sister mating involved males from three to five years of age. These findings are in sharp contrast to observations made on a smaller group on Cayo Santiago. Possible causes for this difference between social groups of different size are discussed.

Congenital and hereditary anomalies in the rhesus monkeys (Macaca mulatta) of Cayo Santiago

Teratology ◽  
1983 ◽  
Vol 28 (2) ◽  
pp. 169-174 ◽  
Author(s):  
Richard G. Rawlins ◽  
Matt J. Kessler
Keyword(s):  
Macaca Mulatta ◽  
Rhesus Monkeys ◽  
Cayo Santiago

Factors Affecting Agonistic Communication in Rhesus Monkeys (Macaca Mulatta)

Behaviour ◽  
1968 ◽  
Vol 31 (3-4) ◽  
pp. 339-357 ◽  
Author(s):  
H.F. Harlow ◽  
G.W. Møller ◽  
G.D. Mitchell
Keyword(s):  
Social Learning ◽  
Facial Expressions ◽  
Macaca Mulatta ◽  
Rhesus Monkeys ◽  
Average Duration ◽  
Social Contact ◽  
Social Partner ◽  
Factors Affecting ◽  
Dependent Behavior ◽  
The Social

AbstractThis study dealt with factors affecting agonistic communication in rhesus monkeys. Definitions were given for various postures, facial expressions, and vocalizations. The data revealed that such communications depended at least upon the following factors: 1. Age Dominance displays (yawning, threats) increased with age while fear grimaces and vocalizations decreased with age. 2. Sex Dominance displays occurred more often and fear grimaces and vocalizations less often in males than in females. Crook tail should be used with caution as a measure of dominance, at least in subadult rhesus monkeys. The average duration of crook tail seemed to be a more relevant index of dominance than the frequency of crook tail. 3. Rearing Motherless mothering and peer deprivation depressed displays of dominance, while rotated mothering increased dominance displays. Repeated separation produced submissive and dependent behavior; however, calls for social contact (coos) were emitted much more frequently in these animals. This vocalization change was probably a product of social learning. 4. Social stimulus Displays of dominance and submission were dependent upon the nature (i.e., size, age, hostility) of the social partner. 5. Adaptation to the social partner Dominance related behaviors decreased and calls for friendly contact increased as the animal became more familiar with a strange social partner.

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