quantification and excretion profiles of pteridines in primate urine.biopterin, 6-hydroxymethyl-pterin, isoxanthopterin, neopterin and, pterin were quantified in stress-free collected spontaneous morning urine samples from callithrix jacchus, saguinus fuscicollis, saguinus labiatus, saimiri sciureus, presbytis entellus, cercopithecus albogularis, cercocebus torquatus, macaca fascicularis, hylobates concolor, pongo pygmaeus, and gorilla gorilla. in most species, biopterin was the most frequent urinary pteridine followed by neopterin. sex differences in biopterin a ...19921404333
breeding season influxes and the behaviour of adult male samango monkeys (cercopithecus mitis albogularis).troops comprising a high density population of samango monkeys (cercopithecus mitis) in natal province, south africa, experienced an influx of adult males during the breeding season. observation of one troop revealed that these males competed with one another and with two resident males for access to receptive females. although both sexes initiated copulation, attempts to do so were more often successful if female-initiated. males did not interact with non-receptive females and there were no rec ...19873443416
reticulum cell sarcoma in a sykes monkey (cercopithecus albogularis). 19694981555
modes of vocal variation in sykes's monkey (cercopithecus albogularis) squeals.acoustic and laryngographic measurements of sykes's monkey (cercopithecus albogularis) squeals showed that acoustic variation between exemplars was principally due to 4 underlying modes of modification: (class i) variation in the transfer function produced by articulation, (class ii) variation in f0 produced by inflection, (class iii) variation in turbulence, and (class iv) variation in the pattern of vibration of laryngeal tissue with large or small surface areas (polyphonic variation). these f ...19957497697
a distinct african lentivirus from sykes' monkeys.asymptomatic infection with simian immunodeficiency virus (siv) has been demonstrated in african sykes' monkeys (cercopithecus mitis albogularis), and virus isolation confirmed infection with a novel siv from sykes' monkeys (sivsyk). macaques inoculated with sivsyk became persistently infected but remained clinically healthy. we utilized polymerase chain reaction amplification to generate a full-length, infectious molecular clone of sivsyk. the genome organization of sivsyk is similar to that of ...19938382307
conservation and host specificity of vpr-mediated cell cycle arrest suggest a fundamental role in primate lentivirus evolution and biology.the human immunodeficiency virus type 1 (hiv-1) vpr protein prevents infected cells from passing through mitosis by arresting them in the g2 phase of the cell cycle. vpr is conserved among all primate lentiviruses, suggesting an important role in the virus life cycle. moreover, in this study we show that the ability to cause cell cycle arrest is also conserved in vpr proteins from a wide variety of both tissue culture-passaged and uncultured human (hiv-1 and hiv-2), sooty mangabey (simian immuno ...19979151821
the skin of primates. 23. a comparative study of the skin of the green monkey (cercopithecus aethiops) and the sykes' monkey (cercopithecus mitis). 196414298299
tetrathyridium sp. in a sykes' monkey (cercopithecus albigularis) from giza zoological gardens, egypt. 195114861724
seroprevalence of simian immunodeficiency virus in wild and captive born sykes' monkeys (cercopithecus mitis) in kenya.the sykes' monkey and related forms (cercopithecus mitis) make up an abundant, widespread and morphologically diverse species complex in eastern africa that naturally harbors a distinct simian immunodeficiency virus (sivsyk). we carried out a retrospective serological survey of siv infection from both wild and captive sykes' monkeys from kenya. we compared two commercially available, cross-reactive elisa tests using hiv antigens with a novel sivsyk antigen-specific western blot assay and analyze ...200415511293
prevalence of antibodies and cell mediated immune response against leishmania major in feral nonhuman primates from kenya, leishmania major is responsible for human cutaneous leishmaniasis (cl). natural infection with l. major of a vervet monkey and experimental susceptibility of some nonhuman primates (nhps) from kenya has been established. however, there has been no comprehensive study of the prevalence of zoonotic cl in kenya. and also, no investigation has been done to assess whether nhps could be potential reservoir hosts of l. major even when the involvement of reservoir animals is obligatory in tran ...200918983806
the japan monkey centre primates brain imaging repository for comparative neuroscience: an archive of digital records including records for endangered species.advances in magnetic resonance imaging (mri) and computational analysis technology have enabled comparisons among various primate brains in a three-dimensional electronic format. results from comparative studies provide information about common features across primates and species-specific features of neuroanatomy. investigation of various species of non-human primates is important for understanding such features, but the majority of comparative mri studies have been based on experimental primat ...201830357587
samango monkeys (cercopithecus albogularis labiatus) manage risk in a highly seasonal, human-modified landscape in amathole mountains, south africa.wild species use habitats that vary in risk across space and time. this risk can derive from natural predators and also from direct and indirect human pressures. a starving forager will often take risks that a less hungry forager would not. at a highly seasonal and human-modified site, we predicted that arboreal samango monkeys (cercopithecus albogularis labiatus) would show highly flexible, responsive, risk-sensitive foraging. we first determined how monkeys use horizontal and vertical space ac ...201728546650
identifying preferred habitats of samango monkeys (cercopithecus (nictitans) mitis, erythrarchus) through patch examine habitat preferences of two groups of samango monkeys (cercopithecus (nictitans) mitis erythrarchus) in the soutpansberg, south africa, we used experimental food patches in fragments of tall forest and in bordering secondary growth short forest. additionally, to test for the impacts of group cohesion and movement on habitat use, we tested for the interaction of space and time in our analyses of foraging intensity in the experimental food patches placed throughout the home ranges of the ...201324513301
fecal glucocorticoids as indicators of metabolic stress in female sykes' monkeys (cercopithecus mitis albogularis).because of their mediating role in the stress response and potential effects on fitness, glucocorticoid (gc) hormones are increasingly used to assess the physiological costs of environmental and behavioral variation among wild vertebrates. identifying the proximate causes of gc variation, however, is complicated by simultaneous exposure to multiple potentially stressful stimuli. here, we use data from a partially provisioned social group of sykes' monkeys to evaluate the effects of potential psy ...201020540944
two incidents of venomous snakebite on juvenile blue and sykes monkeys (cercopithecus mitis stuhlmanni and c. m. albogularis).although rarely observed, predation is thought to be an important factor in the evolution of primate life histories and behavior. here i describe two incidents of snake predation on cercopithecus mitis guenons from kenya. the first case involved a juvenile blue monkey (cercopithecus mitis stuhlmanni) in the kakamega forest, which died following a bite by a gaboon viper (bitis gabonica gabonica). the snake's attempts to ingest its prey were unsuccessful. in the second incident, a juvenile sykes m ...200818704624
frequent water drinking by zanzibar red colobus (procolobus kirkii) in a mangrove forest refuge.isolated populations of procolobus kirkii on uzi island, zanzibar, use rhizophora mucronata-dominated mangrove forest for refuge. three groups, observed over 14 months, spent up to 85% of total observation time in mangroves with brief excursions to adjacent upland coral rag forest, habitat degraded by human cutting. a large proportion of monkeys' diets consisted of plant parts of five mangrove species. water drinking was common and 326 water-drinking events were recorded at a rate of up to 0.87 ...200818651613
behavioral development of captive male hybrid cercopithecine this study, we compare the behavioral development of captive male vervet monkeys (chlorocebus pygerythrus) and sykes' monkeys (cercopithecus albogularis) to male hybrids of these species. focal animal sampling sessions were conducted on the study subjects from birth to 90 months of age. behavioral categories (affiliative, approach, play, sexual, tension, aggressive) were plotted for each species and the hybrids; curves were fitted using polynomial regression and were evaluated with the wilcox ...200516088187
new simian immunodeficiency virus infecting de brazza's monkeys (cercopithecus neglectus): evidence for a cercopithecus monkey virus clade.nearly complete sequences of simian immunodeficiency viruses (sivs) infecting 18 different nonhuman primate species in sub-saharan africa have now been reported; yet, our understanding of the origins, evolutionary history, and geographic distribution of these viruses still remains fragmentary. here, we report the molecular characterization of a lentivirus (sivdeb) naturally infecting de brazza's monkeys (cercopithecus neglectus). complete sivdeb genomes (9,158 and 9227 bp in length) were amplifi ...200415220449
a multidimensional scaling analysis of vowel discrimination in humans and monkeys.multidimensional scaling (mds) was used to compare perceptual maps for 10 synthetic english vowels in humans and old world monkeys (macaca fuscata and cercopithecus albogularis). subjects discriminated among the vowels using a repeating background procedure, and reaction times were submitted to an mds analysis to derive measures of perceive similarity. the dimensions that emerged related to the frequencies of the first (f1), second (f2), and third (f3) formants. human data indicated a good match ...19979401456
perception of chirps by sykes's monkeys (cercopithecus albogularis) and humans (homo sapiens).four sykes's monkeys (cercopithecus albogularis) and 4 humans (homo sapiens) discriminated among 12 chirps presented in a repeating background paradigm. the test stimuli consisted of sets of 4 chirps recorded from sykes's monkeys, red-tailed monkeys (c. ascanius), and small east african birds. reaction times were submitted to a multidimensional scaling analysis. all monkey listeners perceived the bird chirps as similar to each other and distinct from the monkey calls, whereas 3 of the 4 human li ...19947924254
the structure of the shell and polar plugs of the egg of the whipworm, trichuris trichiura (nematoda: trichuridae) from the samango monkey (cercopithecus albogularis).the structure of the shell of the egg of trichuris trichiura was examined using light microscopy as well as scanning and transmission electron microscopy. the results confirmed its three-layered structure and provided evidence that the cores of the polar plugs, which could be seen to be extensions of the shell's middle layer, could be lost en bloc, either mechanically or chemically, and in this way probably provided an exit for the first stage larva at hatching.19892626259
serological survey and virus isolation of simian t-cell leukemia/t-lymphotropic virus type i (stlv-i) in non-human primates in their native countries.infection with a simian retrovirus (stlv-i) closely related to human t-lymphotropic virus type i (htlv-i) was investigated in non-human primates living in their native countries in africa and asia. serum antibodies cross-reacting with htlv-i antigens were detected in 85 of 567 non-human primates of 30 species. seropositive animals were found among african green monkeys, olive baboons, sykes' monkeys, mandrills and patas monkeys in several countries in africa, and cynomolgus monkeys, celebes maca ...19872440820
genetic assessment of an isolated endemic samango monkey (cercopithecus albogularis labiatus) population in the amathole mountains, eastern cape province, south africa.the endemic samango monkey subspecies (cercopithecus albogularis labiatus) inhabits small discontinuous afromontane forest patches in the eastern cape, kwazulu-natal midlands and southern mpumalanga provinces in south africa. the subspecies is affected by restricted migration between forest patches which may impact on gene flow resulting in inbreeding and possible localized extinction. current consensus, based on habitat quality, is that c. a. labiatus can be considered as endangered as the smal ...201829080055
adapting methodology used on captive subjects for estimating gut passage time in wild monkeys.gut passage time of food has consequences for primate digestive strategies, which subsequently affect seed dispersal. seed dispersal models are critical in understanding plant population and community dynamics through estimation of seed dispersal distances, combining movement data with gut passage times. thus, developing methods to collect in situ data on gut passage time are of great importance. here we present a first attempt to develop an in situ study of gut passage time in an arboreal fores ...202032069456
validating a non-invasive technique for monitoring physiological stress in the samango monkey.the non-invasive monitoring of physiological stress can provide conservation and wildlife managers with an invaluable tool for assessing animal welfare and psychological health of captive and free-ranging populations. a significant decrease in free-ranging primate populations globally and an increase in captive-housed primates have led to a need to monitor the stress and general welfare of these animals. we examined the suitability of three enzyme immunoassays (eias) for monitoring stress-relate ...202032129637
influence of food availability, plant productivity, and indigenous forest use on ranging behavior of the endangered samango monkey (cercopithecus albogularis schwarzi), in the soutpansberg mountains, south africa.understanding the determinants of ranging patterns in species susceptible to habitat fragmentation is fundamental for assessing their long-term adaptability to an increasingly human-dominated landscape. the aim of this study was to determine and compare the influence of ground-based food availability, remotely sensed plant productivity, and indigenous forest use on the ranging patterns of the endangered samango monkey (cercopithecus albogularis schwarzi). we collected monthly ranging data on two ...202032297450
brief report: normal hematology values of sykes monkeys (cercopithecus mitis albogularis).hematologic values are presented for the sykes monkey (cercopithecus mitis albogularis). the values are, in general, similar to published findings for other primate species. elevated hemoglobin, possibly caused by high altitude, was noted. significant differences of several values between males and females are discussed.198331992010
spatial patterns of primate electrocutions in diani, kenya.electrocution from power infrastructure threatens many primate species, yet knowledge of effective evidence-based mitigation strategies is limited. mitigation planning requires an understanding of the spatial distribution of electrocutions to prioritize high-risk areas. in diani, a coastal kenyan town, electrocution is an important cause of death for five primate species. in this study we aim to describe the spatial patterns of electrocutions and electric shock incidents (collectively referred t ...201830369684
effects of anthropogenic disturbance on primate density at the landscape scale.accurate estimations of the abundance of threatened animal populations are required for assessment of species' status and vulnerability and conservation planning. however, density estimation is usually difficult and resource demanding, so researchers often collect data at local scales. however, anthropogenic pressures most often have landscape-level effects, for example, through habitat loss and fragmentation. we applied hierarchical distance sampling (hds) to transect count data to determine th ...201930561170
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