| gastrointestinal parasites of the guenons of western uganda. | from january 1998 to december 2002, we collected 293 fecal samples from free-ranging individuals of the 4 guenon species of western uganda, i.e., redtail guenons (cercopithecus ascanius), blue monkeys (cercopithecus mitis), l'hoesti monkeys (cercopithecus lhoesti), and vervet monkeys (cercopithecus aethiops), to quantify the prevalence of gastrointestinal parasites. helminth eggs, larvae, and protozoan cysts were isolated by sodium nitrate flotation and fecal sedimentation. helminth parasites we ... | 2004 | 15715228 |
| simian immunodeficiency virus (siv) from sun-tailed monkeys (cercopithecus solatus): evidence for host-dependent evolution of siv within the c. lhoesti superspecies. | recently we reported the characterization of simian immunodeficiency virus (sivlhoest) from a central african l'hoest monkey (cercopithecus lhoesti lhoesti) that revealed a distant relationship to siv isolated from a mandrill (sivmnd). the present report describes a novel siv (sivsun) isolated from a healthy, wild-caught sun-tailed monkey (cercopithecus lhoesti solatus), another member of the l'hoest superspecies. sivsun replicated in a variety of human t-cell lines and in peripheral blood monon ... | 1999 | 10438863 |
| characterization of a novel simian immunodeficiency virus (siv) from l'hoest monkeys (cercopithecus l'hoesti): implications for the origins of sivmnd and other primate lentiviruses. | the human immunodeficiency virus types 1 and 2 (hiv-1 and hiv-2) appear to have originated by cross-species transmission of simian immunodeficiency virus (siv) from asymptomatically infected african primates. few of the sivs characterized to date efficiently infect human primary lymphocytes. interesting, two of the three identified to infect such cultures (sivsm and sivcpz) have appeared in human populations as genetically related hivs. in the present study, we characterized a novel siv isolate ... | 1999 | 9882304 |
| nodule worm infection in humans and wild primates in uganda: cryptic species in a newly identified region of human transmission. | soil-transmitted helminths (sths) are a major health concern in tropical and sub-tropical countries. oesophagostomum infection is considered endemic to west africa but has also been identified in uganda, east africa, among primates (including humans). however, the taxonomy and ecology of oesophagostomum in uganda have not been studied, except for in chimpanzees (pan troglodytes), which are infected by both o. bifurcum and o. stephanostomum. | 2014 | 24421915 |
| sex chromosome phylogenetics indicate a single transition to terrestriality in the guenons (tribe cercopithecini). | this is the first molecular study to trace the evolutionary transition in substrate preference across a primate radiation. we surveyed 20 guenons (tribe cercopithecini) and 4 outgroup taxa for two y-chromosomal genes, tspy ( approximately 2240 bp) and sry ( approximately 780 bp), and one x-chromosomal intergenic region ( approximately 1600 bp) homologous to a fragment of human xq13.3. parsimony and maximum likelihood analyses of the sex chromosomal datasets consistently cluster the three terrest ... | 2004 | 14871564 |
| cercopithecine y-chromosome data provide a test of competing morphological evolutionary hypotheses. | we report here the results of the first molecular evolutionary analysis to include members of all 10 extant genera of cercopithecine monkeys. a total of 44 individuals were surveyed for approximately 2.2 kb of the testis-specific protein, y-chromosome (tspy). the tspy sequences were subjected to parsimony analyses in paup 4.0, followed by tree comparison tests designed to assess existing morphological hypotheses of cercopithecine evolution. the results of these tests show that the present y-chro ... | 2003 | 12742755 |
| wild mandrillus sphinx are carriers of two types of lentivirus. | mandrillus sphinx, a large primate living in cameroon and gabon and belonging to the papionini tribe, was reported to be infected by a simian immunodeficiency virus (siv) (sivmndgb1) as early as 1988. here, we have identified a second, highly divergent sivmnd (designated sivmnd-2). genomic organization differs between the two viral types; sivmnd-2 has the additional vpx gene, like other sivs naturally infecting the papionini tribe (sivsm and sivrcm) and in contrast to the other sivmnd type (here ... | 2001 | 11435589 |
| noninvasive detection of simian immunodeficiency virus infection in a wild-living l'hoest's monkey (cercopithecus ihoesti). | l'hoest's monkey's (cercopithecus ihoesti) are believed to be naturally infected with a simian immunodeficiency virus (siv), termed siviho, but only a handful of isolates, all derived from captive animals from the democratic republic of congo (dcr), have thus far been characterized. here, we report the noninvasive detection and molecular characterization of siviho in a wild l'hoest's monkey from the nyungwe forest in rwanda. screening four l'hoest's monkey fecal samples collected opportunistical ... | 2003 | 14717118 |
| patterns of genomic sequence diversity among their simian immunodeficiency viruses suggest that l'hoest monkeys (cercopithecus lhoesti) are a natural lentivirus reservoir. | recently, we described a novel simian immunodeficiency virus (sivlhoest) from a wild-caught l'hoest monkey (cercopithecus lhoesti) from a north american zoo. to investigate whether l'hoest monkeys are the natural host for these viruses, we have screened blood samples from 14 wild animals from the democratic republic of congo. eight (57%) were found to be seropositive for siv. nearly full-length genome sequences were obtained for siv isolates from three of these monkeys and compared to the origin ... | 2000 | 10729165 |
| hiv-2/siv viral protein x counteracts hush repressor complex. | to evade host immune defences, human immunodeficiency viruses 1 and 2 (hiv-1 and hiv-2) have evolved auxiliary proteins that target cell restriction factors. viral protein x (vpx) from the hiv-2/sivsmm lineage enhances viral infection by antagonizing samhd1 (refs 1,2), but this antagonism is not sufficient to explain all vpx phenotypes. here, through a proteomic screen, we identified another vpx target-hush (tasor, mpp8 and periphilin)-a complex involved in position-effect variegation3. hush dow ... | 2018 | 29891865 |
| medical management of trichophyton dermatophytosis using a novel treatment regimen in l'hoest's monkeys (cercopithecus lhoesti). | an outbreak of trichophyton dermatophytosis was diagnosed in a group of four l'hoest's monkeys (cercopithecus lhoesti) housed in the primate section at a zoological collection. the affected animals presented with areas of non-pruritic alopecia, scaling and crusting. the diagnosis was based on culture and direct microscopy of hair plucks. treatment was commenced with oral terbinafine at a dose of 8.25 mg/kg bodyweight, topical enilconazole washes and disinfectant fogging of the enclosure. control ... | 2010 | 21262652 |
| prevalence of antibodies to alphaviruses and flaviviruses in free-ranging game animals and nonhuman primates in the greater congo basin. | vector-borne and zoonotic pathogens have comprised a significant proportion of the emerging infectious diseases in humans in recent decades. the role of many wildlife species as reservoirs for arthropod-borne viral pathogens is poorly understood. we investigated the exposure history of various african wildlife species from the congo basin to mosquito-borne flaviviruses and alphaviruses by testing archived serum samples. sera from 24 african forest buffalo (syncerus caffer nanus), 34 african elep ... | 2013 | 23778608 |
| habitat exploitation, diet and some data on reproductive behaviour in a semi-free-ranging colony of cercopithecus lhoesti solatus, a guenon species recently discovered in gabon. | | 1999 | 10050065 |
| foraging ecology of the mountain monkey (cercopithecus l'hoesti): implications for its evolutionary history and use of disturbed forest. | we present the first systematic field study on the feeding ecology of the mountain monkey (circopithecus l'hoesti), a semi-terrestrial guenon. we compare our results with findings from a concurrent study of blue monkeys (c. mitis doggetti, which have an overlapping home range) conducted over ten months in the nyungwe forest reserve, rwanda. the mountain monkeys spent 35% of observation time feeding on terrestrial herbaceous vegetation. thirty-five fruit and seed species comprised 42% of their di ... | 2000 | 10768348 |
| a mobile element-based evolutionary history of guenons (tribe cercopithecini). | guenons (tribe cercopithecini) are a species-rich group of primates that have attracted considerable attention from both primatologists and evolutionary biologists. the complex speciation pattern has made the elucidation of their relationships a challenging task, and many questions remain unanswered. sines are a class of non-autonomous mobile elements and are essentially homoplasy-free characters with known ancestral states, making them useful genetic markers for phylogenetic studies. | 2007 | 17266768 |
| spatial distribution of primates in a mosaic of colonizing and old growth forest at ngogo, kibale national park, uganda. | primate censuses were conducted in a mosaic of colonizing (two locations) and old-growth forests using line transect methods at the ngogo study site, kibale national park, uganda. black and white colobus monkeys (colobus guereza) were encountered more frequently in the colonizing forests than in the old growth forest, while chimpanzees (pan troglodytes) were encountered more frequently in the old growth forest than in colonizing forests. although not significant, results suggest that blue monkey ... | 2006 | 16479411 |
| digestive retention times for allen's swamp monkey and l'hoest's monkey: data with implications for the evolution of cercopithecine digestive strategy. | primates access energy from plant fiber via bacterial fermentation in either a modified forestomach ('foregut'), a caecocolic ('hindgut') chamber of the large intestine, or both. longer digestive retention times allow for more complete fermentation; as such, primates that consume an herbivorous diet high in fiber are expected to have both relatively and absolutely longer retention times than those mammals that rely on more readily digestible plant foods, such as fruit. we used particulate marker ... | 2012 | 22691202 |
| terrestrial adaptations in the postcranial skeletons of guenons. | arboreal and semiterrestrial guenons show similar osteological features of the limbs across a wide range of species, environments, and geography, while the more terrestrially committed guenons exhibit greater morphological divergence. an ecomorphological comparison of two sympatric guenons living in kibale forest, uganda, reveals an array of anatomical adaptations for terrestriality in the limbs of cercopithecus lhoesti similar to those found in erythrocebus patas. in contrast, cercopithecus aet ... | 1994 | 8042696 |
| primate population dynamics over 32.9 years at ngogo, kibale national park, uganda. | we present census data for eight primate species spanning 32.9 years along the same transect at ngogo, kibale national park, uganda, demonstrating major changes in the composition of the primate community. correlated with an estimated decline of ∼89% in the red colobus population was an increase in encounter rates with chimpanzee parties. our data, along with the unusually high rates of predation by chimpanzees on red colobus at ngogo and the fact that the chimpanzee community at ngogo is the la ... | 2011 | 21557287 |
| the body center of mass in primates: is it more caudal than in other quadrupedal mammals? | whole body center of mass (bcom) position values are lacking for a comparative sample of primates. therefore, it still remains unknown whether the bcom in primates is more posteriorly located than in other mammals. the aim of the present report is to provide data for a large sample of primate species and to compare the position of the bcom in primates to non-primate mammals. | 2019 | 30839107 |
| frequent insectivory by two guenons (cercopithecus lhoesti and cercopithecus mitis) in the kalinzu forest, uganda. | i investigated the feeding ecology of l'hoest's monkeys (cercopithecus lhoesti) and blue monkeys (cercopithecus mitis) in the kalinzu forest, uganda. although forest guenons are generally thought to be frugivores or folivores, these two guenons spent a large proportion of their time feeding on invertebrates. the l'hoest's monkey and the blue monkey spent as much as 66 and 50% of their time on insectivory, respectively. these proportions of time spent on invertebrate feeding are higher than those ... | 2006 | 16211340 |
| the presence of a vpu gene and the lack of nef-mediated downmodulation of t cell receptor-cd3 are not always linked in primate lentiviruses. | nef is an accessory protein critical for the ability of human and simian immunodeficiency viruses (hiv and siv) to replicate efficiently in their respective hosts. previous analyses of members of 15 different primate lentivirus lineages revealed a link between nef function and the presence of a vpu gene. in particular, nef proteins of all vpu-containing viruses had lost their ability to downmodulate the t cell (tcr-cd3) receptor. here we examined nef proteins from eight additional siv lineages, ... | 2010 | 21068258 |
| additional data on the distribution of cercopithecus (lhoesti) solatus. | | 1998 | 9751841 |
| where's the cookie? the ability of monkeys to track object transpositions. | object permanence is the ability to represent mentally an object and follow its position even when it has disappeared from view. according to piaget's 6-stage scale of the sensorimotor period of development, it seems that object permanence appears in stage 4 and fully develops in stage 6. in this study, we investigated the ability of some species of monkeys (i.e. pig-tailed macaque, lion-tailed macaque, celebes crested macaque, barbary macaque, de brazza's monkey, l'hoest's monkey, allen's swamp ... | 2018 | 29858974 |