| social structure as a strategy to mitigate the costs of group living: a comparison of gelada and guereza monkeys. | in mammals, and especially primates, group size and social complexity are typically correlated. however, we have no general explanation why this is so. i suggest that the answer may lie in one of the costs of group living: mammalian reproductive endocrinology is extremely sensitive to stress, and forms one of the hidden costs of living in groups. fertility declines with group size widely across the social mammals, including primates, and will ultimately place a constraint on group size. however, ... | 2018 | 29497179 |
| feeding behaviour of red colobus and black and white colobus in east africa. | the feeding behaviour of one troop of red colobus (colobus badius tephrosceles) was observed between august 1969 and june 1970 in the gombe national park. similar observations were made on two troops of red colobus and two of black and white colobus (c. guereza uellensis) in kibale forest reserve, uganda, between august and october 1970. the red colobus at gombe were highly selective in their choice of food, feeding on the leaves, shoots, flowers and fruit of a wide variety of tree species. the ... | 1975 | 805763 |
| sivcol nef counteracts serinc5 by promoting its proteasomal degradation but does not efficiently enhance hiv-1 replication in human cd4+ t cells and lymphoid tissue. | serinc5 is a host restriction factor that impairs infectivity of hiv-1 and other primate lentiviruses and is counteracted by the viral accessory protein nef. however, the importance of serinc5 antagonism for viral replication and cytopathicity remained unclear. here, we show that the nef protein of the highly divergent sivcol lineage infecting mantled guerezas (colobus guereza) is a potent antagonist of serinc5, although it lacks the cd4, cd3 and cd28 down-modulation activities exerted by other ... | 2018 | 30125328 |
| rapid emergence of independent "chromosomal lineages" in silvered-leaf monkey triggered by y/autosome translocation. | sex/autosome translocations are rare events. the only known example in catarrhines is in the silvered-leaf monkey. here the y chromosome was reciprocally translocated with chromosome 1. the rearrangement produced an x1x2y1y2 sex chromosome system. at least three chromosomal variants of the intact chromosome 1 are known to exist. we characterized in high resolution the translocation products (y1 and y2) and the polymorphic forms of the intact chromosome 1 with a panel of more than 150 human bac c ... | 2018 | 29459623 |
| proximity and grooming patterns reveal opposite-sex bonding in rwenzori angolan colobus monkeys (colobus angolensis ruwenzorii). | close proximity and social grooming are important bonding mechanisms in primates. these behaviors show the social structure of a species and many studies have found positive correlations between the degree of kinship and grooming and proximity. we used 1 year of data collected via instantaneous scan sampling on a large "supertroop" of colobus angolensis ruwenzorii at lake nabugabo, uganda, to examine partner preferences for grooming and nearest neighbors in each age-sex class. little is known ab ... | 2018 | 29270880 |
| determinants of colobine monkey abundance: the importance of food energy, protein and fibre content. | a fundamental ecological question is what determines the abundance of animals? answering this question is vital in the formulation of effective management plans for endangered or threatened species. however, there are few general hypotheses proposed to account for variation in animal abundance. studies of folivorous primates are a notable exception. in this group, the protein to fibre ratio of mature leaves is a significant predictor of biomass. however, dasilva (1992) suggested that the availab ... | 2003 | 30893972 |
| infanticide of a newborn black-and-white colobus monkey (colobus guereza) in kibale national park, uganda. | | 2000 | 30545172 |
| interactions between overlapping multimale groups of black and white colobus monkeys (colobus guereza) in the kakamega forest, kenya. | sixteen out of 18 groups of black and white colobus monkeys, or guerezas (colobus guereza), observed in the kakamega forest, kenya, included more than one adult male. each group overlapped in its home range with 4-7 other groups, and no group appeared to have exclusive access to any part of its home range. groups were engaged in intergroup encounters one-quarter of observation time. encounters often occurred around preferred feeding sites as different groups were attracted to such sites in their ... | 1996 | 31918478 |
| digestibility of a high-fiber biscuit-based diet by black and white colobus (colobus guereza). | the acceptability and digestibility of a high-fiber biscuit-based diet was investigated using two adult male colobus guereza animals. although the animals were initially reluctant to accept the biscuit, it was eventually readily consumed. apparent digestion coefficients for the diet (average composition, dry matter basis: 16% crude protein, 25% neutral detergent fiber (ndf), 9.5% acid detergent fiber (adf), 1.2% acid lignin) determined by total fecal collection were 0.871 for dry matter, 0.813 f ... | 1985 | 32102487 |
| novel virus related to kaposi's sarcoma-associated herpesvirus from colobus monkey. | we determined the complete genome sequence of a virus isolated from a mantled guereza that died of primary effusion lymphoma. the virus is closely related to kaposi's sarcoma-associated herpesvirus (kshv) but lacks some genes implicated in kshv pathogenesis. this finding may help determine how kshv causes primary effusion lymphoma in humans. | 2019 | 31310220 |
| comparative morphology of the lingual papillae and their connective tissue cores in the tongue of the abyssinian black-and-white colobus (colobus guereza). | we observed the morphology of the lingual papillae (filiform, fungiform, foliate, and vallate) and their underlying connective tissue cores (ctcs) in abyssinian black-and-white colobus monkeys using light and scanning electron microscopy. the tongues of both juvenile and senescent individuals were relatively short in the rostro-caudal direction, with a rounded apex. lingual tori were absent. numerous filiform papillae were distributed over the entire tongue, except at the lingual root. a pair of ... | 2019 | 30762218 |
| is colobus guereza gallarum a valid endemic ethiopian taxon? | black-and-white colobus (colobus guereza rüppell, 1835) are arboreal old world monkeys inhabiting large parts of the deciduous and evergreen forests of sub-saharan africa. two of the eight subspecies of colobus guereza are endemic to ethiopia: c. g. gallarum and c. g. guereza. however, the validity of the ethiopian taxa is debated and observed morphological differences were attributed to clinal variation within c. g. guereza. to date, no molecular phylogeny of the ethiopian guerezas is available ... | 2019 | 32110714 |
| the diet and feeding behavior of the black-and-white colobus (colobus guereza) in the kalinzu forest, uganda. | one of the goals for primate feeding ecology is to understand the factors that affect inter- and intra-specific variations. therefore, a detailed description of basic feeding ecology in as many populations as possible is necessary and warrants further understanding. the black-and-white colobus (colobus guereza) or guereza is widely distributed in africa and is one of the well-studied colobines in terms of their feeding; they demonstrate considerable variation in their diets in response to local ... | 2020 | 32026152 |
| kaposi sarcoma in mantled guereza. | we identified a novel kaposi's sarcoma herpesvirus-related rhadinovirus (colobine gammaherpesvirus 1) in a mantled guereza (colobus guereza kikuyensis). the animal had multiple oral tumors characterized by proliferation of latent nuclear antigen 1-positive spindle cells and was not co-infected with immunosuppressive simian viruses, suggesting that it had kaposi sarcoma caused by this novel rhadinovirus. | 2019 | 31310216 |
| yersinia infection in two captive guereza colobus monkeys (colobus guereza). | two guereza colobus monkeys (colobus guereza) reared in a zoological garden in japan suddenly died of multifocal fibrinonecrotic gastroenteritis and septicemia associated with infection by yersinia spp. it was necessary to microbiologically differentiate yersinia frederiksenii and y. enterocolitica. we described the pathological findings and discuss the causal agent to emphasize the need to revert to using a combination of multiple examinations for diagnosis. | 2019 | 31308292 |