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At least 235 records · Page 13Linked to original sources
PubMed2003

Vocal similarities and social bonds in Campbell's monkey (Cercopithecus campbelli).

This study examined variations of social call structures in female Campbell's monkeys. The comparison of frequency modulations using a similarity index revealed that each individual presented one to three variants. Some variants were shared by two to several individuals, often associated with play. On the contrary, vocal divergence was observed in a socially isolated animal and a negative correlation appeared between similarity index and the frequency of avoidance. This preliminary study gives the first evidence of variant sharing between group members in primates.

Animals↗
PubMedDate not supplied

Uterine epithelioid trophoblastic tumour in a red-tailed guenon (Cercopithecus ascanius).

Epithelioid trophoblastic tumour (ETT), a rare neoplasm of chorionic-type intermediate trophoblastic cells in the human female, was diagnosed in the uterus of a red-tailed guenon, a non-human primate. The animal, having had two live births, had a recent history of heavy vaginal bleeding. Four years after the last known pregnancy, the animal developed a large invasive mass involving the uterus, right ovary and abdominal wall. The tumour was removed surgically, but at necropsy 1.5 years later was found to have a recurrent neoplasm. Histologically, the original mass consisted of nests and cords of mononuclear intermediate trophoblastic cells whose borders were accentuated by intimately associated eosinophilic hyaline extracellular proteinaceous material. Extensive coalescing areas of necrosis with mineralization surrounding islands of viable neoplastic cells created a "geographical" pattern of necrosis. Immunohistochemical examination revealed that neoplastic cells were diffusely strongly positive for cytokeratin 18, and focally positive for human placental lactogen. The histopathological and immunolabelling patterns were consistent with ETT in human beings. This is the first reported case of epithelioid trophoblastic tumour in a non-human species.

Animals↗
PubMed2005

Manual laterality and task complexity in De Brazza's monkey (Cercopithecus neglectus).

We investigated manual specialisation of six Brazza monkeys, both under structured experimental conditions and while they engaged in unconstrained natural behaviour. Five tasks that varied in complexity, degree of visual guidance, and bimanual coordination were used in the experimental condition. Individual preferences were revealed for each task, and in the case of simple tasks the position of a monkey relative to the task device was shown to impact on manual preference. Strength of laterality and performance were not found to be related. Task complexity influenced strength, but not direction, of manual preference. The small number of animals precluded generalisation to population preferences but the large number of observations and choice of tasks can serve as model for the study of manual preferences in primates.

Age Factors↗
PubMed1977

Infanticide and social organization in the redtail monkey (Cercopithecus ascanius schmidti) in the Kibale Forest, Uganda.

The redtail monkeys of the Kibale Forest, W. Uganda, live in social groups of about 35 members with only one adult male. In one of the study groups the harem male was replaced by a new male from outside the group. This male-replacement was followed by the new male killing and eating two newborn infants in the group. Infants and young juveniles older than one month were not attacked. Following the infanticide the new male copulated with several adult females in the group. 8 months after this male joined the group, 5 other adult and subadult males associated with it. This multimale influx was accompanied by frequent and intense aggression among the males. Comparisons are made with the studies of langurs in India and Ceylon and it is suggested that infanticide following male-replacement in the harem affords reproductive advantages to the new male.

Animals↗
PubMed1977

Spectral and orientation specificity of single cells in foveal striate cortex of the vervet monkey, Cercopithecus aethiops.

1. The spectral sensitivity, orientation specificity and inhibitory surround of seventy-three cells were studied in the vervet monkey. The eye was in the dark or illuminated with steady white or spectral light. The cells were in the striate cortex corresponding to the foveal representation. Nearly all the cells gave on- or on/off-responses.2. More than a third of the cells (41%) responded over a narrow spectral band, in the blue, green, yellow or red section. Three quarters of them were orientation specific with flanking inhibitory surround and half of these were of the ;stopped-end' variety as well. The effect of the wave-length of the background indicated that only a half were activated by such excitatory-inhibitory colour pairs as have been described in the geniculate nucleus.3. A third of the cells (36%) responded to most colours but with the greatest response to green, yellow or red. Less than half were orientation specific. Unlike the narrowband cells, the response decreased with the intensity of the light. Two thirds were activated by the excitatory-inhibitory colour pairs that have been described in the geniculate nucleus.4. In both groups of cells the wave-length of the spectral peak could be different when the stimuli were weak compared with when they were strong.5. One quarter of the cells (23%) gave on/off-responses to all spectral flashes; half were not orientation specific. The difference in orientation specificity between narrow- and broadband cells is significant (P < 0.01).

Action Potentials↗
PubMed1986

Temporal integration in two species of Old World monkeys: blue monkeys (Cercopithecus mitis) and grey-cheeked mangabeys (Cercocebus albigena).

Changes in auditory sensitivity as a function of signal duration were studied in two species of Old World monkeys. Testing was conducted under free-field conditions with pure tones 250, 800, 1600, and 4000 Hz in frequency. Test stimuli ranged in duration from 35-2000 ms. The results showed that the temporal integration functions for the blue monkeys were similar to those reported for rhesus monkeys [T. D. Clack, J. Acoust. Soc. Am. 40, 1140-1146 (1966)], but differed significantly from those for mangabey monkeys and human subjects tested in the same apparatus, by the same procedure. Integration functions for humans and mangabeys did not differ. It was concluded that some taxonomic groups of primates exhibit temporal integration times that are much longer than those characteristic of humans, while others do not, and that interspecific differences in temporal integration are not readily related to species differences in their vocal repertoires.

Adult↗